Lenovo Yoga Tab 3 850 Hmm En 201508 HMM_EN User Manual (English) Hardware Maintenance 8” (YT3 850F/L/M) 8'' Tablet 850F, YT3 850L, 850M) Type ZA09

Yoga Tab 3 8 - Hardware Maintenance Manual yoga_tab_3-8_hmm_en Free User Guide for Lenovo Tablet and eReader, Manual - page3

Yoga Tab 3 - Hardware Maintenance Manual yoga_tab_3-850_hmm_en Free User Guide for Lenovo Tablet and eReader, Manual - page3

2015-08-26

User Manual: Lenovo Yoga Tab 3-850 Hmm En 201508 (English) Hardware Maintenance Manual - YOGA Tab 3 8” (YT3-850F/L/M) YOGA TAB 3 8'' Tablet (YT3-850F, YT3-850L, YT3-850M) - Type ZA09 ZA09 for Lenovo YT3-850F

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YOGA Tab 3 8”
Hardware Maintenance Manual
Lenovo YT3-850F
Lenovo YT3-850L
Lenovo YT3-850M

Note:
Before using this information and the product it supports, be sure to read the general information
under “Notices” on page 85.

First Edition (Aug 2015)
© Copyright Lenovo 2015. All rights reserved.
LENOVO products, data, computer software, and services have been developed exclusively at private
expense and are sold to governmental entities as commercial items as defined by 48 C.F.R. 2.101 with
limited and restricted rights to use, reproduction and disclosure.
LIMITED AND RESTRICTED RIGHTS NOTICE: If products, data, computer software, or services are
delivered pursuant to a General Services Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-35F-05925.
© 2014 Lenovo

Contents
About this manual........................................iv
Safety information.........................................1
General safety ...................................................... 2
Electrical safety .................................................... 3
Safety inspection guide ...................................... 5
Handling devices that are sensitive to electrostatic discharge .................................................... 6
Grounding requirements ................................... 6
Safety notices: multilingual translations.......... 7
Laser compliance statement............................. 14

1090 Main board .......................................... 66
1100 USB and Volume key FPC................. 70
1110 Volume key.......................................... 74
1120 Power button ....................................... 76
1130 Main antenna....................................... 77
1140 Diversity antenna (LTE versions only)
81
Notices .........................................................85
Trademarks......................................................... 86

Important service information ...................16
Strategy for replacing FRUs............................. 16
Important notice for replacing a system
board ............................................................. 17
Important information about replacing RoHS
compliant FRUs ................................................. 18
General checkout ........................................19
What to do first .................................................. 20
Power system checkout .................................... 21
Checking the Computer AC Charger....... 21
Checking the internal battery status......... 22
Related service information .......................23
Security ............................................................... 23
Power management .......................................... 23
Activating/Deactivating the Display ........ 23
Lenovo YT3-850 ..........................................24
Specifications ..................................................... 24
Components location ........................................ 26
Front view .................................................... 26
Rear view ...................................................... 27
Parts list .............................................................. 28
FRUs list........................................................ 28
Screws list ..................................................... 31
FRU replacement notices.................................. 32
Screw notices................................................ 32
Removing and replacing an FRU.................... 33
1010 Rear cover............................................ 34
1020 Left speaker assembly unit (with power
key FPC)........................................................ 37
1030 Rotated camera ................................... 43
1040 Hinge frame latch............................... 49
1050 Right speaker assembly unit (with microphone and audio jack)........................... 51
1060 Battery pack......................................... 55
1070 LCD FPC.............................................. 61
1080 Vibrator motor .................................... 64

iii

About this manual
This manual contains service and reference information for the following
Lenovo product of the specified versions:
• Lenovo YT3-850 (WiFi version, LTE data version and LTE voice version)
Use this manual to troubleshoot problems.
The manual is divided into the following sections:
• The common sections provide general information, guidelines, and safety
information required for servicing computers.
• The product-specific section includes service, reference, and product-specific
parts information.

Note:
The information provided in this manual is applicable to both product
versions mentioned above, unless otherwise specified.

Important:
This manual is intended only for trained servicers who are familiar with
Lenovo products. Use this manual to troubleshoot problems effectively.
Before servicing a Lenovo product, make sure to read all the information
under “Safety information” on page 1 and “Important service information”
on page 16.

Safety information

Safety information
This chapter presents the following safety information that you need to get
familiar with before you service a Lenovo computer:
• “General safety” on page 2
• “Electrical safety” on page 3
• “Safety inspection guide” on page 5
• “Handling devices that are sensitive to electrostatic discharge” on page 6
• “Grounding requirements” on page 6
• “Safety notices: multilingual translations” on page 7
• “Laser compliance statement” on page 14

Lenovo YT3-850 Hardware Maintenance Manual

General safety
Follow these rules below to ensure general safety:
• Observe a good housekeeping in the area where the machines are put during
and after the maintenance.
• When lifting any heavy object:
1. Make sure that you can stand safely without slipping.
2. Distribute the weight of the object equally between your feet.
3. Use a slow lifting force. Never move suddenly or twist when you attempt
to lift it.
4. Lift it by standing or pushing up with your leg muscles; this action could
avoid the strain from the muscles in your back. Do not attempt to lift any
object that weighs more than 16 kg (35 lb) or that you think is too heavy for
you.
• Do not perform any action that causes hazards to the customer, or that makes
the machine unsafe.
• Before you start the machine, make sure that other service representatives
and the customer are not in a hazardous position.
• Place removed covers and other parts in a safe place, keeping them away
from all personnel, while you are servicing the machine.
• Keep your toolcase away from walk areas so that other people will not trip it
over.
• Do not wear loose clothing that can be trapped in the moving parts of the
machine. Make sure that your sleeves are fastened or rolled up above your
elbows. If your hair is long, fasten it.
• Insert the ends of your necktie or scarf inside clothing or fasten it with the
nonconductive clip, about 8 centimeters (3 inches) from the end.
• Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for
your clothing.
Attention: Metal objects are good electrical conductors.
• Wear safety glasses when you are hammering, drilling, soldering, cutting
wire, attaching springs, using solvents, or working in any other conditions
that may be hazardous to your eyes.
• After service, reinstall all safety shields, guards, labels, and ground wires.
Replace any safety device that is worn or defective.
• Reinstall all covers correctly before returning the machine to the customer.
• Fan louvers on the machine help to prevent the overheating of internal
components. Do not obstruct fan louvers or cover them with labels or
stickers.

Safety information

Electrical safety
Observe the following rules when working on electrical equipments.
Important:
Use only approved tools and test equipments. Some hand tools have
handles covered with a soft material that does not insulate you when
working with live electrical currents.
Many customers have rubber floor mats near their machines that contain
small conductive fibers to decrease electrostatic discharges. Do not use such
kind of mat to protect yourself from electrical shock.
• Find the room emergency power-off (EPO) switch for disconnecting the
switch or electrical outlet. If an electrical accident occurs, you can then
operate the switch or unplug the power cord quickly.
• Do not work alone under hazardous conditions or near the equipment that
has hazardous voltages.
• Disconnect all power before:
— Performing a mechanical inspection
— Working near power supplies
— Removing or installing main units
• Before you start to work on the machine, unplug the power cord. If you
cannot unplug it, ask the customer to power-off the wall box that supplies
power to the machine, and to lock the wall box in the off position.
• If you need to work on a machine that has exposed electrical circuits, observe
the following precautions:
— Ensure that another person, familiar with the power-off controls, is near
you.
Attention: Another person must be there to switch off the power, if
necessary.
— Use only one hand when working with powered-on electrical equipment;
keep the other hand in your pocket or behind your back.
Attention: An electrical shock can occur only when there is a complete
circuit. By observing the above rule, you may prevent a current from
passing through your body.
— When using testers, set the controls correctly and use the approved probe
leads and accessories for that tester.
— Stand on suitable rubber mats (obtained locally, if necessary) to insulate
you from grounds such as metal floor strips and machine frames.
Observe the special safety precautions when you work with very high voltages;
instructions for these precautions are in the safety sections of maintenance
information. Be extremely careful when you measure the high voltages.
• Regularly inspect and maintain your electrical hand tools for safe operational
condition.
• Do not use worn or broken tools and testers.
• Never assume that power has been disconnected from a circuit. First, check it
to make sure that it has been powered off.

Lenovo YT3-850 Hardware Maintenance Manual

• Always look carefully for possible hazards in your work area. Examples of
these hazards are moist floors, nongrounded power extension cables, power
surges, and missing safety grounds.
• Do not touch live electrical circuits with the reflective surface of a plastic
dental mirror. The surface is conductive; such touching can cause personal
injury and machine damage.
• Do not service the following parts with the power on when they are removed
from their normal operating places in a machine:
— Power supply units
— Pumps
— Blowers and fans
— Motor generators
and similar units. (This practice ensures correct grounding of the units.)
• If an electrical accident occurs:
— Caution: do not become a victim yourself.
— Switch off the power.
— Send the victim to get medical aid.

Safety information

Safety inspection guide
The purpose of this inspection guide is to assist you in identifying potential
unsafe conditions. As each machine was designed and built, required safety
items were installed to protect users and service personnel from injury. This
guide addresses only those items. You should use good judgment to identify
potential safety hazards according to the attachment of non-Lenovo features or
options not covered by this inspection guide.
If any unsafe conditions are present, you must determine how serious the
apparent hazard could be and whether you can continue without first correcting
the problem.
Consider these conditions and the safety hazards they present:
• Electrical hazards, especially primary power (primary voltage on the frame
can cause serious or fatal electrical shock)
• Explosive hazards, such as a damaged CRT face or a bulging capacitor
• Mechanical hazards, such as loose or missing hardware
To determine whether there are any potential unsafe conditions, use the
following checklist at the beginning of every service task. Begin the checks with
the power off, and the power cord disconnected.
Checklist:
1. Check exterior covers for damage (loose, broken, or sharp edges).
2. Turn off the computer. Disconnect the power cord.
3. Check the power cord for:
a. A third-wire ground connector in good condition. Use a meter to measure
third-wire ground continuity for 0.1 ohm or less between the external
ground pin and the frame ground.
b. The power cord should be the type specified in the parts list.
c. Insulation must not be frayed or worn.
4. Check for cracked or bulging batteries.
5. Remove the cover.
6. Check for any obvious non-Lenovo alterations. Use good judgment as to the
safety of any non-Lenovo alterations.
7. Check inside the unit for any obvious unsafe conditions, such as metal filings,
contamination, water or other liquids, or signs of fire or smoke damage.
8. Check for worn, frayed, or pinched cables.
9. Check that the power-supply cover fasteners (screws or rivets) have not been
removed or tampered with.

Lenovo YT3-850 Hardware Maintenance Manual

Handling devices that are sensitive to electrostatic discharge
Any computer part containing transistors or integrated circuits (ICs) should be
considered sensitive to electrostatic discharge (ESD). ESD damage can occur
when there is a difference in charge between objects. Protect against ESD damage
by equalizing the charge so that the machine, the part, the work mat, and the
person handling the part are all at the same charge.

Notes:
1. Use product-specific ESD procedures when they exceed the
requirements noted here.
2. Make sure that the ESD protective devices you use have been certified
(ISO 9000) as fully effective.

When handling ESD-sensitive parts:
• Keep the parts in protective packages until they are inserted into the product.
• Avoid contact with other people.
• Wear a grounded wrist strap against your skin to eliminate static on your
body.
• Prevent the part from touching your clothing. Most clothing is insulative and
retains a charge even when you are wearing a wrist strap.
• Use the black side of a grounded work mat to provide a static-free work
surface. The mat is especially useful when handling ESD-sensitive devices.
• Select a grounding system, such as those listed below, to provide protection
that meets the specific service requirement.

Notes:
The use of a grounding system to guard against ESD damage is desirable but
not necessary.
— Attach the ESD ground clip to any frame ground, ground braid, or greenwire ground.
— When working on a double-insulated or battery-operated system, use an
ESD common ground or reference point. You can use coax or connectoroutside shells on these systems.
— Use the round ground prong of the ac plug on ac-operated computers.

Grounding requirements
Electrical grounding of the computer is required for operator safety and correct
system function. Proper grounding of the electrical outlet can be verified by a
certified electrician.

Safety information

Safety notices: multilingual translations
The safety notices in this section are provided in English, French, German,
Hebrew, Italian, Japanese, and Spanish.
Safety notice 1
Before the computer is powered on after FRU replacement, make sure all
screws, springs, and other small parts are in place and are not left loose
inside the computer. Verify this by shaking the computer and listening for
rattling sounds. Metallic parts or metal flakes can cause electrical shorts.
Avant de remettre l’ordinateur sous tension après remplacement d’une unité
en clientèle, vérifiez que tous les ressorts, vis et autres pièces sont bien en
place et bien fixées. Pour ce faire, secouez l’unité et assurez-vous qu’aucun
bruit suspect ne se produit. Des pièces métalliques ou des copeaux de métal
pourraient causer un court-circuit.
Bevor nach einem FRU-Austausch der Computer wieder angeschlossen
wird, muß sichergestellt werden, daß keine Schrauben, Federn oder andere
Kleinteile fehlen oder im Gehäuse vergessen wurden. Der Computer muß
geschüttelt und auf Klappergeräusche geprüft werden. Metallteile odersplitter können Kurzschlüsse erzeugen.

Prima di accendere l’elaboratore dopo che é stata effettuata la sostituzione di
una FRU, accertarsi che tutte le viti, le molle e tutte le altri parti di piccole
dimensioni siano nella corretta posizione e non siano sparse all’interno
dell’elaboratore. Verificare ciò scuotendo l’elaboratore e prestando
attenzione ad eventuali rumori; eventuali parti o pezzetti metallici possono
provocare cortocircuiti pericolosi.

Antes de encender el sistema despues de sustituir una FRU, compruebe que
todos los tornillos, muelles y demás piezas pequeñas se encuentran en su
sitio y no se encuentran sueltas dentro del sistema. Compruébelo agitando el
sistema y escuchando los posibles ruidos que provocarían. Las piezas
metálicas pueden causar cortocircuitos eléctricos.

Lenovo YT3-850 Hardware Maintenance Manual

Safety notice 2
DANGER
Some standby batteries contain a small amount of nickel and cadmium. Do
not disassemble a standby battery, recharge it, throw it into fire or water, or
short-circuit it. Dispose of the battery as required by local ordinances or
regulations. Use only the battery in the appropriate parts listing. Use of an
incorrect battery can result in ignition or explosion of the battery.
Certaines batteries de secours contiennent du nickel et du cadmium. Ne les
démontez pas, ne les rechargez pas, ne les exposez ni au feu ni à l’eau. Ne
les mettez pas en court-circuit. Pour les mettre au rebut, conformez-vous à
la réglementation en vigueur. Lorsque vous remplacez la pile de sauvegarde
ou celle de l’horloge temps réel, veillez à n’utiliser que les modèles cités dans
la liste de pièces détachées adéquate. Une batterie ou une pile inappropriée
risque de prendre feu ou d’exploser.
Die Bereitschaftsbatterie, die sich unter dem Diskettenlaufwerk befindet,
kann geringe Mengen Nickel und Cadmium enthalten. Sie darf nicht
zerlegt, wiederaufgeladen, kurzgeschlossen, oder Feuer oder Wasser
ausgesetzt werden. Bei der Entsorgung die örtlichen Bestimmungen für
Sondermüll beachten. Beim Ersetzen der Bereitschafts-oder Systembatterie
nur Batterien des Typs verwenden, der in der Ersatzteilliste aufgeführt ist.
Der Einsatz falscher Batterien kann zu Entzündung oder Explosion führen.

Alcune batterie di riserva contengono una piccola quantità di nichel e
cadmio. Non smontarle, ricaricarle, gettarle nel fuoco o nell’acqua né
cortocircuitarle. Smaltirle secondo la normativa in vigore (DPR 915/82,
successive disposizioni e disposizioni locali). Quando si sostituisce la
batteria dell’RTC (real time clock) o la batteria di supporto, utilizzare
soltanto i tipi inseriti nell’appropriato Catalogo parti. L’impiego di una
batteria non adatta potrebbe determinare l’incendio o l’esplosione della
batteria stessa.

Algunas baterías de reserva contienen una pequeña cantidad de níquel y
cadmio. No las desmonte, ni recargue, ni las eche al fuego o al agua ni las
cortocircuite. Deséchelas tal como dispone la normativa local. Utilice sólo
baterías que se encuentren en la lista de piezas. La utilización de una batería
no apropiada puede provocar la ignición o explosión de la misma.

Safety information

Safety notice 3
DANGER
The battery pack contains small amounts of nickel. Do not disassemble it,
throw it into fire or water, or short-circuit it. Dispose of the battery pack as
required by local ordinances or regulations. Use only the battery in the
appropriate parts listing when replacing the battery pack. Use of an
incorrect battery can result in ignition or explosion of the battery.
La batterie contient du nickel. Ne la démontez pas, ne l’exposez ni au feu ni
à l’eau. Ne la mettez pas en court-circuit. Pour la mettre au rebut,
conformez-vous à la réglementation en vigueur. Lorsque vous remplacez la
batterie, veillez à n’utiliser que les modèles cités dans la liste de pièces
détachées adéquate. En effet, une batterie inappropriée risque de prendre
feu ou d’exploser.
Akkus enthalten geringe Mengen von Nickel. Sie dürfen nicht zerlegt,
wiederaufgeladen, kurzgeschlossen, oder Feuer oder Wasser ausgesetzt
werden. Bei der Entsorgung die örtlichen Bestimmungen für Sondermüll
beachten. Beim Ersetzen der Batterie nur Batterien des Typs verwenden, der
in der Ersatzteilliste aufgeführt ist. Der Einsatz falscher Batterien kann zu
Entzündung oder Explosion führen.

La batteria contiene piccole quantità di nichel. Non smontarla, gettarla nel
fuoco o nell’acqua né cortocircuitarla. Smaltirla secondo la normativa in
vigore (DPR 915/82, successive disposizioni e disposizioni locali). Quando si
sostituisce la batteria, utilizzare soltanto i tipi inseriti nell’appropriato
Catalogo parti. L’impiego di una batteria non adatta potrebbe determinare
l’incendio o l’esplosione della batteria stessa.

Las baterías contienen pequeñas cantidades de níquel. No las desmonte, ni
recargue, ni las eche al fuego o al agua ni las cortocircuite. Deséchelas tal
como dispone la normativa local. Utilice sólo baterías que se encuentren en
la lista de piezas al sustituir la batería. La utilización de una batería no
apropiada puede provocar la ignición o explosión de la misma.

Lenovo YT3-850 Hardware Maintenance Manual

Safety notice 4
DANGER
The lithium battery can cause a fire, an explosion, or a severe burn. Do not
recharge it, remove its polarized connector, disassemble it, heat it above
100°C (212°F), incinerate it, or expose its cell contents to water. Dispose of
the battery as required by local ordinances or regulations. Use only the
battery in the appropriate parts listing. Use of an incorrect battery can result
in ignition or explosion of the battery.
La pile de sauvegarde contient du lithium. Elle présente des risques
d’incendie, d’explosion ou de brûlures graves. Ne la rechargez pas, ne
retirez pas son connecteur polarisé et ne la démontez pas. Ne l’exposez pas
à une temperature supérieure à 100°C, ne la faites pas brûler et n’en exposez
pas le contenu à l’eau. Mettez la pile au rebut conformément à la
réglementation en vigueur. Une pile inappropriée risque de prendre feu ou
d’exploser.
Die Systembatterie ist eine Lithiumbatterie. Sie kann sich entzünden,
explodieren oder schwere Verbrennungen hervorrufen. Batterien dieses
Typs dürfen nicht aufgeladen, zerlegt, über 100 C erhitzt oder verbrannt
werden. Auch darf ihr Inhalt nicht mit Wasser in Verbindung gebracht oder
der zur richtigen Polung angebrachte Verbindungsstecker entfernt werden.
Bei der Entsorgung die örtlichen Bestimmungen für Sondermüll beachten.
Beim Ersetzen der Batterie nur Batterien des Typs verwenden, der in der
Ersatzteilliste aufgeführt ist. Der Einsatz falscher Batterien kann zu
Entzündung oder Explosion führen.

La batteria di supporto e una batteria al litio e puo incendiarsi, esplodere o
procurare gravi ustioni. Evitare di ricaricarla, smontarne il connettore
polarizzato, smontarla, riscaldarla ad una temperatura superiore ai 100
gradi centigradi, incendiarla o gettarla in acqua. Smaltirla secondo la
normativa in vigore (DPR 915/82, successive disposizioni e disposizioni
locali). L’impiego di una batteria non adatta potrebbe determinare
l’incendio o l’esplosione della batteria stessa.

La batería de repuesto es una batería de litio y puede provocar incendios,
explosiones o quemaduras graves. No la recargue, ni quite el conector
polarizado, ni la desmonte, ni caliente por encima de los 100°C (212°F), ni la
incinere ni exponga el contenido de sus celdas al agua. Deséchela tal como
dispone la normativa local.

Safety information

Safety notice 5
If the LCD breaks and the fluid from inside the LCD gets into your eyes or
on your hands, immediately wash the affected areas with water at least for
15 minutes. Seek medical care if any symptoms caused by the fluid are
present after washing.
Si le panneau d’affichage à cristaux liquides se brise et que vous recevez dans
les yeux ou sur les mains une partie du fluide, rincez-les abondamment
pendant au moins quinze minutes. Consultez un médecin si des symptômes
persistent après le lavage.
Die Leuchtstoffröhre im LCD-Bildschirm enthält Quecksilber. Bei der
Entsorgung die örtlichen Bestimmungen für Sondermüll beachten. Der
LCD-Bildschirm besteht aus Glas und kann zerbrechen, wenn er
unsachgemäß behandelt wird oder der Computer auf den Boden fällt. Wenn
der Bildschirm beschädigt ist und die darin befindliche Flüssigkeit in
Kontakt mit Haut und Augen gerät, sollten die betroffenen Stellen
mindestens 15 Minuten mit Wasser abgespült und bei Beschwerden
anschließend ein Arzt aufgesucht werden.

Nel caso che caso l’LCD si dovesse rompere ed il liquido in esso contenuto
entrasse in contatto con gli occhi o le mani, lavare immediatamente le parti
interessate con acqua corrente per almeno 15 minuti; poi consultare un
medico se i sintomi dovessero permanere.

Si la LCD se rompe y el fluido de su interior entra en contacto con sus ojos o
sus manos, lave inmediatamente las áreas afectadas con agua durante
15 minutos como mínimo. Obtenga atención medica si se presenta algún

Lenovo YT3-850 Hardware Maintenance Manual

Safety notice 6
DANGER
To avoid shock, do not remove the plastic cover that protects the lower part
of the inverter card.
Afin d’éviter tout risque de choc électrique, ne retirez pas le cache en
plastique protégeant la partie inférieure de la carte d’alimentation.
Aus Sicherheitsgründen die Kunststoffabdeckung, die den unteren Teil der
Spannungswandlerplatine umgibt, nicht entfernen.

Per evitare scosse elettriche, non rimuovere la copertura in plastica che
avvolge la parte inferiore della scheda invertitore.

Para evitar descargas, no quite la cubierta de plástico que rodea la parte baja
de la tarjeta invertida.

Safety notice 7
DANGER
Though the main batteries have low voltage, a shorted or grounded battery
can produce enough current to burn personnel or combustible materials.
Bien que le voltage des batteries principales soit peu élevé, le court-circuit ou
la mise à la masse d’une batterie peut produire suffisamment de courant
pour brûler des matériaux combustibles ou causer des brûlures corporelles
graves.
Obwohl Hauptbatterien eine niedrige Spannung haben, können sie doch bei
Kurzschluß oder Erdung genug Strom abgeben, um brennbare Materialien
zu entzünden oder Verletzungen bei Personen hervorzurufen.

Sebbene le batterie di alimentazione siano a basso voltaggio, una batteria in
corto circuito o a massa può fornire corrente sufficiente da bruciare materiali
combustibili o provocare ustioni ai tecnici di manutenzione.

Aunque las baterías principales tienen un voltaje bajo, una batería
cortocircuitada o con contacto a tierra puede producir la corriente suficiente
como para quemar material combustible o provocar quemaduras en el
personal.

Safety information

Safety notice 8
DANGER
Before removing any FRU, turn off the computer, unplug all power cords
from electrical outlets, remove the battery pack, and then disconnect any
interconnecting cables.
Avant de retirer une unité remplaçable en clientèle, mettez le système hors
tension, débranchez tous les cordons d’alimentation des socles de prise de
courant, retirez la batterie et déconnectez tous les cordons d’interface.
Die Stromzufuhr muß abgeschaltet, alle Stromkabel aus der Steckdose
gezogen, der Akku entfernt und alle Verbindungskabel abgenommen sein,
bevor eine FRU entfernt wird.

Prima di rimuovere qualsiasi FRU, spegnere il sistema, scollegare dalle prese
elettriche tutti i cavi di alimentazione, rimuovere la batteria e poi scollegare
i cavi di interconnessione.

Antes de quitar una FRU, apague el sistema, desenchufe todos los cables de
las tomas de corriente eléctrica, quite la batería y, a continuación, desconecte
cualquier cable de conexión entre dispositivos.

Lenovo YT3-850 Hardware Maintenance Manual

Laser compliance statement
Some models of Lenovo computer are equipped from the factory with an optical
storage device such as a CD-ROM drive or a DVD-ROM drive. Such devices are
also sold separately as options. If one of these drives is installed, it is certified in
the U.S. to conform to the requirements of the Department of Health and Human
Services 21 Code of Federal Regulations (DHHS 21 CFR) Subchapter J for Class
1 laser products. Elsewhere, the drive is certified to conform to the requirements
of the International Electrotechnical Commission (IEC) 825 and CENELEC EN 60
825 for Class 1 laser products.
If a CD-ROM drive, a DVD-ROM drive, or another laser device is installed, note
the following:

CAUTION
Use of controls or adjustments or performance of procedures other than
those specified herein might result in hazardous radiation exposure.
O uso de controles, ajustes ou desempenho de procedimentos diferentes
daqueles aqui especificados pode resultar em perigosa exposição à radiação.

Pour éviter tout risque d’exposition au rayon laser, respectez les consignes
de réglage et d’utilisation des commandes, ainsi que les procédures décrites.
Werden Steuer- und Einstellelemente anders als hier festgesetzt verwendet,
kann gefährliche Laserstrahlung auftreten.

L’utilizzo di controlli, regolazioni o l’esecuzione di procedure diverse da
quelle specificate possono provocare l’esposizione a.

El uso de controles o ajustes o la ejecución de procedimientos distintos de los
aquí especificados puede provocar la exposición a radiaciones peligrosas.
Opening the CD-ROM drive, the DVD-ROM drive, or any other optical storage
device could result in exposure to hazardous laser radiation. There are no
serviceable parts inside those drives. Do not open.

Safety information

A CD-ROM drive, a DVD-ROM drive, or any other storage device installed may
contain an embedded Class 3A or Class 3B laser diode. Note the following:
DANGER
Emits visible and invisible laser radiation when open. Do not stare into the
beam, do not view directly with optical instruments, and avoid direct
exposure to the beam.
Radiação por raio laser ao abrir. Não olhe fixo no feixe de luz, não olhe
diretamente por meio de instrumentos óticos e evite exposição direta com o
feixe de luz.

Rayonnement laser si carter ouvert. Évitez de fixer le faisceau, de le regarder
directement avec des instruments optiques, ou de vous exposer au rayon.
Laserstrahlung bei geöffnetem Gerät. Nicht direkt oder über optische
Instrumente in den Laserstrahl sehen und den Strahlungsbereich meiden.
Kinyitáskor lézersugár ! Ne nézzen bele se szabad szemmel, se optikai
eszközökkel. Kerülje a sugárnyalábbal való érintkezést!
Aprendo l’unità vengono emesse radiazioni laser. Non fissare il fascio, non
guardarlo direttamente con strumenti ottici e evitare l’esposizione diretta al
fascio.

Radiación láser al abrir. No mire fijamente ni examine con instrumental
óptico el haz de luz. Evite la exposición directa al haz.

Lenovo YT3-850 Hardware Maintenance Manual

Important service information
This chapter presents the following important service information:
• “Strategy for replacing FRUs” on page 16
— “Important notice for replacing a system board” on page 17
• “Important information about replacing RoHS compliant FRUs” on page 18
Important:
BIOS and device driver fixes are customer-installable. The BIOS and device
drivers are posted on the customer support site:
http://consumersupport.lenovo.com/.

Strategy for replacing FRUs
Before replacing parts:
Make sure that all software fixes, drivers, and BIOS downloads are installed
before replacing any FRUs listed in this manual.
After a system board is replaced, ensure that the latest BIOS is loaded to the
system board before completing the service action.
To download software fixes, drivers, and BIOS, follow the steps below:
1. Go to http://consumersupport.lenovo.com/.
2. Enter a serial number or select a product or use Lenovo smart downloading.
3. Select the BIOS/Driver/Applications and download.
4. Follow the directions on the screen and install the necessary software.
Use the following strategy to prevent unnecessary expense for replacing and
servicing FRUs:
• If you are instructed to replace an FRU, but the replacement does not solve
the problem, reinstall the original FRU before you continue.
• Some computers have both a processor board and a system board. If you are
instructed to replace either of them, and replacing one of them does not solve
the problem, reinstall that board, and then replace the other one.
• If an adapter or a device consists of more than one FRU, any of the FRUs may
be the cause of the error. Before replacing the adapter or device, remove the
FRUs one by one to see if the symptoms change. Replace only the FRU that
changed the symptoms.
Attention: The setup configuration on the computer you are servicing may have
been customized. Running Automatic Configuration may alter the settings. Note
the current configuration settings (using the View Configuration option); then,
when service has been completed, verify that those settings remain in effect.

Important service information

Important notice for replacing a system board
Some components mounted on a system board are very sensitive. Improper
handling can cause damage to those components, and may cause a system
malfunction.
Attention: When handling a system board:
• Do not drop the system board or apply any excessive force to it.
• Avoid rough handling of any kind.
• Avoid bending the system board and hard pushing to prevent cracking at
each BGA (Ball Grid Array) chipset.

Lenovo YT3-850 Hardware Maintenance Manual

Important information about replacing RoHS compliant FRUs
RoHS, The Restriction of Hazardous Substances in Electrical and
Electronic Equipment Directive (2002/95/EC) is a European Union legal
requirement affecting the global electronics industry. RoHS requirements
must be implemented on Lenovo products placed on the market after June
2006. Products on the market before June 2006 are not required to have
RoHS compliant parts. If the original FRU parts are non-compliant,
replacement parts can also be non-compliant. In all cases if the original
FRU parts are RoHS compliant, the replacement part must also be RoHS
compliant.
Note: RoHS and non-RoHS FRU part numbers with the same fit and function are
identified with unique FRU part numbers.
Lenovo plans to transit to RoHS compliance well before the implementation date
and expects its suppliers to be ready to support Lenovo’s requirements and
schedule in the EU. Products sold in 2005 and 2006 will contain some RoHS
compliant FRUs. The following statement pertains to these products and any
product Lenovo produces containing RoHS compliant FRUs.
RoHS compliant FRUs have unique FRU part numbers. Before or after the RoHS
implementation date, failed RoHS compliant parts must always be replaced with
RoHS compliant ones, so only the FRUs identified as compliant in the system
HMM or direct substitutions for those FRUs may be used.
Products marketed before June 2006 Products marketed after June 2006
Current or
original part

Replacement
FRU

Non-RoHS

Can be Non-RoHS

Non-RoHS

Can be RoHS

Non-RoHS

Can sub to RoHS

RoHS

Must be RoHS

Current or
original part

Replacement
FRU

Must be RoHS

Note: A direct substitution is a part with a different FRU part number that is
automatically shipped by the distribution center at the time of the order.

General checkout

General checkout
This chapter presents the following information:
• “What to do first” on page 20
• “Power system checkout” on page 21
Before you go to the checkout, make sure to read the following important notes:

Important notes:
• Only certified trained personnel can service the computer.
• Before replacing any FRU, read the entire page on removing and
replacing FRUs.
• When you replace FRUs, use new nylon-coated screws.
• Be extremely careful during such write operations as copying,
saving, or formatting. Drives in the computer that you are servicing
sequence might have been altered. If you select an incorrect drive, data
or programs might be overwritten.
• Replace an FRU only with another FRU of the correct model. When
you replace an FRU, make sure that the machine model and the FRU part
number are correct by referring to the FRU parts list.
• An FRU should not be replaced just because of a single,
unreproducible failure. Single failures can occur for a variety of reasons
that have nothing to do with a hardware defect, such as cosmic radiation,
electrostatic discharge, or software errors. Consider replacing an FRU
only when a problem recurs. If you suspect that an FRU is defective,
clear the error logs and run the test again. If the error does not recur, do
not replace the FRU.
• Be careful not to replace a nondefective FRU.

Lenovo YT3-850 Hardware Maintenance Manual

What to do first
When you do return an FRU, you must include the following information in the
parts exchange form or parts return form that you attach to it:
1. Name and phone number of servicer
2. Date of service
3. Date on which the machine failed
4. Date of purchase
5. Procedure index and page number in which the failing FRU was detected
6. Failing FRU name and part number
7. Machine type, model number, and serial number
8. Customer’s name and address
Note for warranty: During the warranty period, the customer may be
responsible for repair costs if the computer damage was caused by misuse,
accident, modification, unsuitable physical or operating environment, or
improper maintenance by the customer.
The following is a list of some common items that are not covered under
warranty and some symptoms that might indicate that the system was subjected
to stress beyond normal use.
Before checking problems with the computer, determine whether the damage is
covered under the warranty by referring to the following list:
The following are not covered under warranty:
• LCD panel cracked from the application of excessive force or from being
dropped
• Scratched (cosmetic) parts
• Distortion, deformation, or discoloration of the cosmetic parts
• Plastic parts, latches, pins, or connectors that have been cracked or broken by
excessive force
• Damage caused by liquid spilled into the system
• Damage caused by the improper insertion of a PC Card or the installation of
an incompatible card
• Improper disk insertion or use of an optical drive
• Diskette drive damage caused by pressure on the diskette drive cover,
foreign material in the drive, or the insertion of a diskette with multiple
labels
• Damaged or bent diskette eject button
• Fuses blown by attachment of a nonsupported device
• Forgotten computer password (making the computer unusable)
• Sticky keys caused by spilling a liquid onto the keyboard
• Use of an incorrect AC adapter on laptop products
The following symptoms might indicate damage caused by nonwarranted
activities:
• Missing parts might be a symptom of unauthorized service or modification.
• If the spindle of a hard disk drive becomes noisy, it may have been subjected
to excessive force, or dropped.

General checkout

Power system checkout
To verify a symptom, follow the steps below:
1. Turn off the computer.
2. Remove the battery pack.
3. Connect the AC adapter.
4. Make sure that power is supplied when you turn on the computer.
5. Turn off the computer.
6. Disconnect the AC adapter and install the charged battery pack.
7. Make sure that the battery pack supplies power when you turn on the
computer.
If you suspect a power problem, see the appropriate one of the following power
supply checkouts:
• “Checking the Computer AC Charger” on page 21
• “Checking the internal battery status” on page 22

Checking the Computer AC Charger
When you use the computer AC Charger to charge the tablet but no power is
charged, see the instructions in this topic to check the computer AC Charger.
To check the computer AC Charger, do the following:
1. Disconnect the micro-USB cable from the tablet.
2. Measure the output voltage across the connector marked B of the micro-USB
cable. Refer to the following figure:

3 (5V)

Voltage (V dc)

Ground

Note: The output voltage across pin 3 of the micro-B connector might be
different from the one you are servicing.
3. If the voltage is not correct, replace the micro-USB cable.
4. If the voltage is acceptable, replace the system board.

Lenovo YT3-850 Hardware Maintenance Manual

Checking the internal battery status
To check the battery status of the tablet, do either of the following:
• Approximate information about the battery status
Get the approximate status of the battery at any time by checking the battery
status icon on the system bar in the upper-right corner of the screen. The
shorter the green bar is, the less the battery power remains.
• Accurate information about the battery status
To get the accurate information about the battery status of the tablet, do the
following:
1. Open the Android Settings screen.
To open the Android Settings screen, do either of the following:
–
–

From the main Home screen, touch the Android Settings icon on
Lenovo Launch Zone. The Android Settings screen is displayed.

Pull down the application icon from the action bar and then touch
Settings. The Android Settings screen is displayed.
2. Touch Battery in the Device section on the Android Settings screen.
3. The accurate percentage of the remaining battery power is shown on the
screen.

Related service information

Related service information
This chapter presents the following information:
• “Security” on page 23
• “Power management” on page 23

Security
Security settings include: SCREEN SECURITY, SIM CARD LOCK (LTE version
only), PASSWORDS, DEVICE ADMINISTRATION and CREDENTIAL
STORAGE.

Power management
Note: Power management modes are not supported for APM operating system.
To reduce power consumption, the computer has three power management
modes: screen blank, sleep (standby), and hibernation.

Activating/Deactivating the Display
With the display deactivated, press the Power button on the computer to activate
the display. The computer display will then illuminate, indicating that it has
been activated.
If you do not need to use your computer temporarily, you can press the Power
button to deactivate the display. Your computer will then enter standby mode to
save power.

Lenovo YT3-850 Hardware Maintenance Manual

Lenovo YT3-850
This chapter presents the following product-specific service references and
product-specific parts information:
• “Specifications” on page 24
• “Components location” on page 26
• “Parts list” on page 28
• “FRU replacement notices” on page 32
• “Removing and replacing an FRU” on page 33

Specifications
The following table lists the specifications of the Lenovo TY3-850 tablet.

Note:
The listed technical data is applicable to all versions of the product, i.e. the
WiFi version (Lenovo TY3-850F), the LTE data version (Lenovo TY3-850L)
and the LTE voice version (Lenovo TY3-850M), unless otherwise specified.

Table 1. Specifications
Feature

Description

Size & Weight
Size

• 210mm x 146mm x (3.0 ~ 7.0)mm

Weight

• WiFi version: 466g
• LTE versions: 472g

System
CPU

• N/A

Platform Chipset

• Qualcomm® Sandragon™ APQ8009 (HD edition)
(WiFi version)
• Qualcomm® Snapdragon™ MSM8909(HD edition)
(LTE versions)

Graphic Chipset

• Andero 304

RAM

• LP-DDR3 1GB

Storage Capacity

• 16GB

LCD

• 8.0”, IPS, 800 x 1,280 pixels

Camera

• Rotated camera, 8.0Mega pixels

Battery

• Li-ion battery, 6,200 ~ 6,400mAh

Operating System
• Android 5.1 or later versions
Network
• GSM, UMTS, TD-SCDMA, FDD LTE, TDD LTE
(LTE versions only)

Lenovo YT3-850

Ports
• Micro-USB (USB 2.0)
• Combo Audio Jack, 3.5mm (with Audio and
Microphone)
• Micro SIM card slot (LTE versions only)
• Micro-SD card slot (support external Micro-SD card
up to 64GB)
Communication
• WiFi: 802.11 b/g/n, 2.4GHz
• Wireless WAN (LTE versions only): FDD LTE Cat.4
150Mbps, DC-HSPA+ 42 Mbps, TD-SCDMA
• GSM/EDGE: Band 2/3/5/8 (LTE versions only)
• WCDMA: Band 1/2/5/8 (LTE versions only), China
Market only
• WCDMA: Band 1/2/4/5/8 (LTE versions only), ROW
• TD-SCDMA: Band 34/39 (LTE versions only), China
Market only
• FDD LTE: Band 1/3/7 (LTE versions only), China
Market only
• FDD LTE: Band 1/3/4/5/7/8/19/20 (LTE versions
only), ROW
• TDD LTE: Band 38/39/40/41 (LTE versions only),
China Market only
• TDD LTE: Band 38/40/ (LTE versions only), ROW
• Bluetooth 3.0 and 4.0
• GPS
• GLONASS
• AGPS (LTE versions only)
• Beidou
• Voice call (LTE voice version only)
Others
•
•
•
•
•
•
•
•
•
•

Speaker (Left and right)
Microphone
Gravity sensor
E-compass
Ambient light sensor
Vibrator
Hall sensor
LED indicator (on power button)
Dolby audio system
Camera Gesture Control

Lenovo YT3-850 Hardware Maintenance Manual

Components location
Front view
a Left speaker
Right speaker

Lenovo YT3-850

Rear view
Audio Jack
Microphone
SIM card slot (for LTE versions only)
Micro-SD card slot
Volume key
Micro-USB connection
Power key
Rotated camera

k Hinge frame latch

Lenovo YT3-850 Hardware Maintenance Manual

Parts list
This section presents the following service parts:
• “FRUs list” on page 28
• “Screws list” on page 31

FRUs list

Lenovo YT3-850

Lenovo YT3-850 Hardware Maintenance Manual

Table 1. FRUs list–Overall
No. FRU
1

Lenovo YT3-850 rear cover

FRU No.
Lenovo YT3-850 F:

CRU ID
N

5S58C02834
Lenovo YT3-850 L/M:
2
3
4
5

Lenovo YT3-850 front module (TP
LCM assembly)
Lenovo YT3-850 battery pack
battery cell
Lenovo YT3-850 card slot cover
Lenovo YT3-850 right speaker
assembly unit (with microphone
and audio jack)
Microphone
Lenovo YT3-850 main antenna

5S58C03455
5D68C02838

5SR8C02843
SB18C01425
5MO8C02835
5SB8C02842

N
N
N
N

SSB9A44424
Lenovo YT3-850 F:

N
N

5A38C02814
Lenovo YT3-850 L/M:
7
8

Lenovo YT3-850 metal piece for
fixing the battery FPC
Lenovo YT3-850 metal piece for
fastening the battery and camera
FPC
Lenovo YT3-850 main board

5A38C03453
5M88C02833

5M88C02832

Lenovo YT3-850F:

5B28C02839 (16G)
Lenovo YT3-850L
5B28C03457 (16G)
Lenovo YT3-850M
10
11
12
13
14
15

Lenovo YT3-850 vibrator
Lenovo YT3-850 volume key
Lenovo YT3-850 USB and volume
key FPC
Lenovo YT3-850 LCD FPC
Lenovo YT3-850 power key
Lenovo YT3-850 left speaker
assembly unit (with power key FPC)

Lenovo YT3-850 diversity antenna

17
18
19

Lenovo YT3-850 hinge frame latch
Lenovo YT3-850 rotated camera
Lenovo YT3-850 hinge pivot

5B28C03456 (16G)
5M78C02825
5B68C02816
5F78C02818

N
N
N

5F78C02821
5B68C02815
5SB8C02841

N
N
N

Lenovo YT3-850L/M:
5SB8C02841
5SR8C02826
5C28C02840
5M88C02827

N
N
N
N

Lenovo YT3-850

Screws list
Table 2. Parts list–Screw
FRU

P/N

Phillips cross head screw, M1.4 × 1.8, wide head
Phillips cross head screw, M1.4 × 2.0
Phillips cross head screw, M1.4 × 4.0
Phillips cross head screw, M1.4 × 3.0
Phillips cross head screw, ST1.4 × 3.0

5M88C02828
5M88C02829
5M88C02830
5M89A6N1KD
5M88C02831

CRU ID
N
N
N
N
N

Lenovo YT3-850 Hardware Maintenance Manual

FRU replacement notices
This section presents notices related to removing and replacing parts. Read this
section carefully before replacing any FRU.

Screw notices
Loose screws can cause a reliability problem. In Lenovo computers, this problem
is addressed with special nylon-coated screws that have the following
characteristics:
• They maintain tight connections.
• They do not easily come loose, even with shock or vibration.
• They are harder to tighten.
• Each one should be used only once.
Do the following when you service this machine:
• Keep the screw kit in your tool bag.
• Always use new screws.
• Use a torque screwdriver if you have one.
Tighten screws as follows:
• Plastic to plastic
Turn an additional 90° after the screw head touches the surface of the plastic
part:
more than 90°

(Cross-section)

• Logic card to plastic
Turn an additional 180° after the screw head touches the surface of the logic
card:
more than 180°

(Cross-section)

• Torque driver
If you have a torque screwdriver, refer to the “Torque” column for each step.
• Make sure that you use the correct screws. If you have a torque screwdriver,
tighten all screws firmly to the torque shown in the table. Never use a screw
that you removed. Use a new one. Make sure that all screws are
tightened firmly.
• Ensure torque screwdrivers are calibrated correctly following country
specifications.

Lenovo YT3-850

Removing and replacing an FRU
This section presents exploded figures with the instructions to indicate how to
remove and replace the FRU. Make sure to observe the following general rules:
1. Do not attempt to service any computer unless you have been trained and
certified. An untrained person runs the risk of damaging parts.
2. Before replacing any FRU, review “FRU replacement notices” on page 32.
3. Begin by removing any FRUs that have to be removed before the failing FRU.
Any of such FRUs are listed at the top of the section that describes the
detailed removing and replacing procedure for the failing FRU. Remove
them in the order in which they are listed.
4. Follow the correct sequence in the steps to remove the FRU, while referring
to figures provided in the procedure.
5. When turning a screw to replace an FRU, turn it in the direction as given by
the arrow in the figure.
6. When removing the FRU, move it in the direction as given by the arrow in the
figure.
7. To put the new FRU in place, reverse the removal procedures and follow any
of the notes that pertain to replacement. For information about connecting
and arranging internal cables, see “Components location” on page 26.
8. When replacing an FRU, use the correct screw as specified in the procedures.

DANGER
Before removing any FRU, turn off the computer, unplug all power cords
from electrical outlets, remove the battery pack, and then disconnect any of
the interconnecting cables.

Attention: After replacing an FRU, do not turn on the computer until you have
made sure that all screws, springs, and other small parts are in place and none
are loose inside the computer. Verify this by shaking the computer gently and
listening for rattling sounds. Metallic parts or metal flakes can cause electrical
short circuits.
Attention: The system board is sensitive to, and can be damaged by, electrostatic
discharge. Before touching it, establish personal grounding by touching a
ground point with one hand or using an electrostatic discharge (ESD) strap
(P/N 6405959) to remove potential shock reasons.

Lenovo YT3-850 Hardware Maintenance Manual

1010 Rear cover
1. Open the hinge frame.

Figure 1-1. Opening the hinge frame
2. Remove the card slot cover.

Figure 1-2. Removing the card slot cover

Lenovo YT3-850

3. Remove screws a on the rear cover as shown in the figure below.

Figure 1-3. The screws on the rear cover
Part No.

Screw (quantity)

Color

Torque

M1.4 × 2.0 (3)

Silver

N/A

4. Hold the tablet in one hand and use a triangle paddle to unlock the rear cover
from the top middle of the tablet along the joint line as shown in the figure
below.

Figure 1-4. Unlocking the rear cover from the main body (along the joint line)

Lenovo YT3-850 Hardware Maintenance Manual

5. Slowly remove the rear cover.
CAUTION:
Handle with care!
The rear cover or its locks can be damaged!
Do not try to lift the rear cover off the tablet when it is tightly locked or
conglutinated at some places. Use a thin blade to unlock or seperate these
places first.

Figure 1-5. The removed rear cover

Lenovo YT3-850

1020 Left speaker assembly unit (with power key FPC)
For access, remove the following FRU:
• “1010 Rear cover” on page 34
1. Remove screws a on the metal piece for fixing the battery FPC as shown in
the figure below.

Figure 2-1. The screws on the metal piece for fixing the battery FPC
Part No.

Screw (quantity)

Color

Torque

M1.4 × 2.0 (2)

Silver

N/A

Lenovo YT3-850 Hardware Maintenance Manual

2. Remove the metal piece using a pair of tweezers.

Figure 2-2. Removing the metal piece
3. Disconnect the power supply to the tablet by detaching the battery FPC from
its connector on the main board.

Figure 2-3. Disconnecting the power supply of the tablet

Lenovo YT3-850

4. Remove screws a on the holder of the rotated camera as shown in the figure
below.

Figure 2-4. The screws on the holder of the rotated camera
Part No.

Screw (quantity)

Color

Torque

M1.4 × 3.0 (2)

Black

N/A

5. Remove screws a on the left speaker unit as shown in the figure below.

Figure 2-5. The screws on the left speaker unit
Part No.

Screw (quantity)

Color

Torque

M1.4 × 4.0(2)

Blue

N/A

Lenovo YT3-850 Hardware Maintenance Manual

6. Detach the FPC connector of the rotated camera from the main board.

Figure 2-6. Detaching the FPC connector of the rotated camera
7. Unlock the connector of the power key FPC on the main board using a
triangle paddle.

Figure 2-7. Unlocking the connector of the power key FPC

Lenovo YT3-850

8. Pull out the power key FPC from its connector using a pair of tweezers.

Figure 2-8. Pulling out the power key FPC
9. Gently push the rotated camera assembly, and at the same time push the left
speaker unit in the direction as shown in the figure below.

Figure 2-9. Removing the left speaker assembly unit (with power key FPC)

Lenovo YT3-850 Hardware Maintenance Manual

Figure 2-10. The removed left speaker assembly unit (with power key FPC)

Lenovo YT3-850

1030 Rotated camera
For access, remove the following FRU:
• “1010 Rear cover” on page 34
1. Remove screws a on the metal piece for fixing the battery FPC as shown in
the figure below.

Figure 3-1. The screws on the metal piece for fixing the battery FPC
Part No.

Screw (quantity)

Color

Torque

M1.4 × 2.0 (2)

Silver

N/A

Lenovo YT3-850 Hardware Maintenance Manual

2. Remove the metal piece using a pair of tweezers.

Figure 3-2. Removing the metal piece
3. Disconnect the power supply to the tablet by detaching the battery FPC from
its connector on the main board.

Figure 3-3. Disconnecting the power supply of the tablet

Lenovo YT3-850

4. Remove screws a on the holder of the rotated camera as shown in the figure
below.

Figure 3-4. The screws on the holder of the rotated camera
Part No.

Screw (quantity)

Color

Torque

M1.4 × 3.0 (2)

Black

N/A

5. Remove screws a on the left speaker unit as shown in the figure below.

Figure 3-5. The screws on the left speaker unit
Part No.

Screw (quantity)

Color

Torque

M1.4 × 4.0 (2)

Blue

N/A

Lenovo YT3-850 Hardware Maintenance Manual

6. Detach the FPC connector of the rotated camera from the main board.

Figure 3-6. Detaching the FPC connector of the rotated camera
7. Unlock the connector of the power key FPC on the main board using a
triangle paddle.

Figure 3-7. Unlocking the connector of the power key FPC

Lenovo YT3-850

8. Pull out the power key FPC from its connector using a pair of tweezers.

Figure 3-8. Pulling out the power key FPC
9. Gently push the rotated camera assembly, and at the same time push the left
speaker unit in the direction as shown in the figure below.

Figure 3-9. Removing the rotated camera

Lenovo YT3-850 Hardware Maintenance Manual

Figure 3-10. The removed rotated camera

Lenovo YT3-850

1040 Hinge frame latch
For access, remove the following FRUs in order:
• “1010 Rear cover” on page 34
and
Detach the following FPC from the main board:
• Battery FPC (see Step 1 on page 37 to Step 3 on page 38 in “1020 Left speaker
assembly unit (with power key FPC)”)
1. Remove screws a on the hinge frame latch as shown in the figure below.

Figure 4-1. The screws on the hinge latch
Part No. Screw (quantity)

Color

Torque

Silver

N/A

M1.4 × 2.0 (4)

Lenovo YT3-850 Hardware Maintenance Manual

2. Remove the hinge frame latch.

Figure 4-2. Removing the hinge frame latch

Figure 4-3. The removed hinge frame latch

Lenovo YT3-850

1050 Right speaker assembly unit (with microphone and audio
jack)
For access, remove the following FRUs in order:
• “1010 Rear cover” on page 34
and
Detach the following FPC from the main board:
• Battery FPC (see Step 1 on page 37 to Step 3 on page 38 in “1020 Left speaker
assembly unit (with power key FPC)”)
1. Remove screws a on the right speaker as shown in the figure below.

Figure 5-1. The screws on the right speaker
Part No.

Screw (quantity)

Color

Torque

M1.4 × 4.0 (2)

Blue

N/A

Lenovo YT3-850 Hardware Maintenance Manual

2. Detach the right speaker unit from the front module of the tablet.

Figure 5-2. Detaching the right speaker unit
3. Detach the microphone using a pair of tweezers as shown in the figure below.

Figure 5-3. Detaching the microphone

Lenovo YT3-850

4. Unlock the connector of the right speaker FPC on the main board using a
triangle paddle.

Figure 5-4. Unlocking the connector of the right speaker FPC
5. Pull out the right speaker FPC from its connector using a pair of tweezers.

Figure 5-5. Pulling out the right speaker FPC

Lenovo YT3-850 Hardware Maintenance Manual

Figure 5-6. The removed right speaker assembly unit (with microphone and audio jack)

Lenovo YT3-850

1060 Battery pack
For access, remove the following FRUs in order:
• “1010 Rear cover” on page 34
• “1020 Left speaker assembly unit (with power key FPC)” on page 37
• “1030 Rotated camera” on page 43
and
Detach the following unit:
• Right speaker assembly unit (see Step 1 on page 51 to Step 2 on page 52 in
“1050 Right speaker assembly unit (with microphone and audio jack)”)
Rechargeable Battery Notice
CAUTION:
Risk of explosion if the battery is replaced with an incorrect type.
When replacing the lithium battery, use only the same or an equivalent type
that is recommended by the manufacturer. The battery contains lithium and
can explode if not properly used, handled, or disposed of.
Dispose of the used battery according to the instructions. Do not:
• Throw or immerse into water
• Heat to more than 100°C (212°F)
• Repair or disassemble
1. Remove screw a on the metal piece for fastening the battery and camera FPC
as shown in the figure below.

Figure 6-1. The screws on the metal piece for fastening the battery and camera FPC
Part No.

Screw (quantity)

Color

Torque

M1.4 × 2.0 (1)

Silver

N/A

Lenovo YT3-850 Hardware Maintenance Manual

2. Remove the metal piece.

Figure 6-2. Removing the metal piece
3. Slowly pull out the hinge pivot using a pair of tweezers.

Figure 6-3. Pulling out the hinge pivot

Lenovo YT3-850

4. Detach the battery pack at the left end, turn the battery pack clockwise
around its right end so as to steer the battery FPC out through the supporting
frame at the right end, and then remove the battery pack from the main body
of the tablet.

Figure 6-4. Detaching the battery pack at the left end

Figure 6-5. Removing the battery pack

Lenovo YT3-850 Hardware Maintenance Manual

Figure 6-6. The removed battery pack
To further remove the battery cell, continue with the following steps:
5. Peel off the foil on the battery cover at the FPC end of the hinge frame.

Figure 6-7. Peeling off the foil on the battery cover

Lenovo YT3-850

6. Remove screw a on the battery cover as shown in the figure below.

Figure 6-8. The screw on the battery cover
Part No.

Screw (quantity)

Color

Torque

ST1.4 × 3.0 (1)

Black

N/A

7. Remove the battery cover as shown in the figure below.

Figure 6-9. Removing the battery cover

Lenovo YT3-850 Hardware Maintenance Manual

8. Remove the battery pack from the hinge frame.

Figure 6-10. Removing the battery cell

Figure 6-11. The removed battery cell

Lenovo YT3-850

1070 LCD FPC
For access, remove the following FRUs in order:
• “1010 Rear cover” on page 34
and
Detach the following FPC from the main board:
• Battery FPC (see Step 1 on page 37 to Step 3 on page 38 in “1020 Left speaker
assembly unit (with power key FPC)”
1. Unlock the connector of the LCD FPC on the main board using a triangle
paddle.

Figure 7-1. Unlocking the connector of the LCD FPC (main board side)

Lenovo YT3-850 Hardware Maintenance Manual

2. Pull out the LCD FPC from its connector on the main board using a pair of
tweezers.

Figure 7-2. Pulling out the LCD FPC (from the main board side)
3. Unlock the connector of the LCD FPC on the front module of the tablet using
a triangle paddle.

Figure 7-3. Unlocking the connector of the LCD FPC (front module side)

Lenovo YT3-850

4. Remove the LCD FPC from its connector on the front module.

Figure 7-4. Removing the LCD FPC (from the front module side)

Figure 7-5. The removed LCD FPC

Lenovo YT3-850 Hardware Maintenance Manual

1080 Vibrator motor
For access, remove the following FRU:
• “1010 Rear cover” on page 34
Detach the following FPC from the main board:
• Battery FPC (see Step 1 on page 37 to Step 3 on page 38 in “1020 Left speaker
assembly unit (with power key FPC)”
1. Desolder the wires of the vibrator motor from the main board at the position
shown in the figure below.

Figure 8-1. Position for desoldering the wires of the vibrator motor
2. Detach the vibrator motor from its seat.

Figure 8-2. Detaching the vibrator motor

Lenovo YT3-850

Figure 8-3. The removed vibrator motor

Lenovo YT3-850 Hardware Maintenance Manual

1090 Main board
Important notices for handling PCB:
When handling PCB, bear the following in mind:
• Be careful not to drop the PCB onto a bench top that has a hard surface,
such as surface made of metal, wood, or composite materials.
• Avoid rough handling of any kind.
• Make sure not to drop or stack the PCB in the whole process.
• Make sure to put the PCB only on surface covered with such materials as
an ESD mat or conductive corrugated plate.

For access, remove the following FRU in order:
• “1010 Rear cover” on page 34
• “1020 Left speaker assembly unit (with power key FPC)” on page 37
• “1030 Rotated camera” on page 43
and
Detach the following FPCs and wire connections from the main board:
• Right speaker FPC (see Step 4 on page 53 to Step 5 on page 53 in “1050 Right
speaker assembly unit (with microphone and audio jack)”)
• LCD FPC (see Step 1 on page 61 and Step 2 on page 62 in “1070 LCD FPC”)
• Vibrator motor wire connections (see Step 1 on page 64 in “1080 Vibrator
motor”)
1. Unlock the connector of the TP FPC on the main board using a triangle
paddle as shown in the figure below.

Figure 9-1. Unlocking the connector of the TP FPC

Lenovo YT3-850

2. Pull out the TP FPC from its unlocked connector using a pair of tweezers.

Figure 9-2. Pulling out the TP FPC
3. Detach the connector of the USB and volume key FPC from the main board
using a pair of tweezers.

Figure 9-3. Detaching the connector of the USB and volume key FPC

Lenovo YT3-850 Hardware Maintenance Manual

4. Disconnect antenna cable from its connector on the main board at the
position shown in the figure below.

Figure 9-4. Positions for disconnecting the antennas
5. Remove screws a on the main board as shown in the figure below.

Figure 9-5. The screws on the main board

Part No. Screw (quantity)

Color

Torque

Silver

N/A

M1.4 × 1.8, wide head (6)

Lenovo YT3-850

6. Remove the main board.

Figure 9-6. Removing the main board

Figure 9-7. The removed main board

Lenovo YT3-850 Hardware Maintenance Manual

1100 USB and Volume key FPC
For access, remove the following FRUs in order:
• “1010 Rear cover” on page 34
• “1020 Left speaker assembly unit (with power key FPC)” on page 37
• “1030 Rotated camera” on page 43
and
Detach the following FPCs, wire connections and FRUs:
• Right speaker FPC (see Step 4 on page 53 to Step 5 on page 53 in “1050 Right
speaker assembly unit (with microphone and audio jack)”)
• LCD FPC (see Step 1 on page 61 and Step 2 on page 62 in “1070 LCD FPC”)
• Vibrator motor (see Step 1 on page 64 in “1080 Vibrator motor”)
• TP FPC (see Step 1 on page 66 to Step 2 on page 67 in “1090 Main board”
• Antenna cables (see Step 4 on page 68 in “1090 Main board”)
1. Detach the connector of the USB and volume key FPC from the main board
using a pair of tweezers.

Figure 10-1. Detaching the connector of the USB and volume key FPC

Lenovo YT3-850

2. Remove screws a on the main board as shown in the figure below.

Figure 10-2. The screws on the main board
Part No. Screw (quantity)

Color

Torque

Silver

N/A

M1.4 × 1.8, wide head (6)

3. Remove the main board attached with vibrator motor.

Figure 10-3. Removing the main board attached with vibrator motor

Lenovo YT3-850 Hardware Maintenance Manual

4. Detach the USB and volume key FPC from its seat as shown in the figure
below.

Figure 10-4. Detaching the USB and volume key FPC from its seat
5. Detach the USB and volume key FPC from the side of the tablet front module.

Figure 10-5. Detaching the USB and volume key FPC

Lenovo YT3-850

Figure 10-6. The removed USB and volume key FPC

Lenovo YT3-850 Hardware Maintenance Manual

1110 Volume key
For access, remove the following FRU:
• “1010 Rear cover” on page 34
1. Detach the volume key at the positions shown in the figure below.

Figure 11-1. Detaching the volume key
2. Remove the volume key.

Figure 11-2. Removing the volume key

Lenovo YT3-850

Figure 11-3. The removed volume key

Lenovo YT3-850 Hardware Maintenance Manual

1120 Power button
For access, remove the following FRU:
• “1010 Rear cover” on page 34
1. Remove the power button from the rear cover.

Figure 12-1. Removing the power button

Figure 12-2. The removed power button

Lenovo YT3-850

1130 Main antenna
For access, remove the following FRU:
• “1010 Rear cover” on page 34
• “1020 Left speaker assembly unit (with power key FPC)” on page 37
• “1030 Rotated camera” on page 43
and
Detach the following FPCs, wire connections and FRUs:
• Right speaker FPC (see Step 4 on page 53 to Step 5 on page 53 in “1050 Right
speaker assembly unit (with microphone and audio jack)”)
• LCD FPC (see Step 1 on page 61 and Step 2 on page 62 in “1070 LCD FPC”)
• Vibrator motor (see Step 1 on page 64 in “1080 Vibrator motor”)
• TP FPC (see Step 1 on page 66 to Step 2 on page 67 in “1090 Main board”)
1. Remove screws a on the main antenna as shown in the figure below.

Figure 13-1. The screw on the antenna
Part No.

Screw (quantity)

Color

Torque

M1.4 × 2.0 (3)

Silver

N/A

Lenovo YT3-850 Hardware Maintenance Manual

2. Disconnect the main antenna cable from its connector on the main board at
the position shown in the figure below.

Figure 13-2. Positions for disconnecting the antennas
3. Remove screws a on the main board as shown in the figure below.

Figure 13-3. The screws on the main board

Part No. Screw (quantity)

Color

Torque

Silver

N/A

M1.4 × 1.8, wide head (6)

Lenovo YT3-850

4. Detach the main board.

Figure 13-4. Detaching the main board
5. Remove the main antenna.

Figure 13-5. Removing the antenna

Lenovo YT3-850 Hardware Maintenance Manual

Figure 13-6. The removed antenna

Lenovo YT3-850

1140 Diversity antenna (LTE versions only)
For access, remove the following FRU:
• “1010 Rear cover” on page 34
• “1020 Left speaker assembly unit (with power key FPC)” on page 37
• “1030 Rotated camera” on page 43
and
Detach the following FPCs, wire connections and FRUs:
• Right speaker FPC (see Step 4 on page 53 to Step 5 on page 53 in “1050 Right
speaker assembly unit (with microphone and audio jack)”)
• LCD FPC (see Step 1 on page 61 and Step 2 on page 62 in “1070 LCD FPC”)
• Vibrator motor (see Step 1 on page 64 in “1080 Vibrator motor”)
• TP FPC (see Step 1 on page 66 to Step 2 on page 67 in “1090 Main board”)
1. Disconnect the diversity antenna cable from its connector on the main board
at the position shown in the figure below.

Figure 14-1. Positions for disconnecting the antennas

Lenovo YT3-850 Hardware Maintenance Manual

2. Remove screws a on the diversity antenna as shown in the figure below.

Figure 15-1. The screw on the antenna
Part No.

Screw (quantity)

Color

Torque

M1.4 × 2.0 (2)

Silver

N/A

3. Remove screws a on the main board as shown in the figure below.

Figure 15-2. The screws on the main board

Part No. Screw (quantity)

Color

Torque

Silver

N/A

M1.4 × 1.8, wide head (6)

Lenovo YT3-850

4. Detach the main board.

Figure 15-3. Detaching the main board
5. Remove the diversity antenna.

Figure 15-4. Removing the antenna

Lenovo YT3-850 Hardware Maintenance Manual

Figure 15-5. The removed antenna

Notices

Notices
Lenovo may not offer the products, services, or features discussed in this
document in all countries. Consult your local Lenovo representative for
information on the products and services currently available in your area. Any
reference to a Lenovo product, program, or service is not intended to state or
imply that only that Lenovo product, program, or service may be used. Any
functionally equivalent product, program, or service that does not infringe any
Lenovo intellectual property right may be used instead. However, it is the user’s
responsibility to evaluate and verify the operation of any other product,
program, or service.
Lenovo may have patents or pending patent applications covering subject
matter described in this document. The furnishing of this document does not
give you any license to these patents.
LENOVO GROUP LTD. PROVIDES THIS PUBLICATION “AS IS” WITHOUT
WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR
PURPOSE. Some jurisdictions do not allow disclaimer of express or implied
warranties in certain transactions, therefore, this statement may not apply to
you.
This information could include technical inaccuracies or typographical errors.
Changes are periodically made to the information herein; these changes will be
incorporated in new editions of the publication. Lenovo may make
improvements and/or changes in the product(s) and/or the program(s) described
in this publication at any time without notice.
The products described in this document are not intended for use in
implantation or other life support applications where malfunction may result in
injury or death to persons. The information contained in this document does not
affect or change Lenovo product specifications or warranties. Nothing in this
document shall operate as an express or implied license or indemnity under the
intellectual property rights of Lenovo or third parties. All information contained
in this document was obtained in specific environments and is presented as an
illustration. The result obtained in other operating environments may vary.
Lenovo may use or distribute any of the information you supply in any way it
believes appropriate without incurring any obligation to you.
Any references in this publication to non-Lenovo Web sites are provided for
convenience only and do not in any manner serve as an endorsement of those
Web sites. The materials at those Web sites are not part of the materials for this
Lenovo product, and use of those Web sites is at your own risk.

Lenovo YT3-850 Hardware Maintenance Manual

Any performance data contained herein was determined in a controlled
environment. Therefore, the result obtained in other operating environments
may vary significantly. Some measurements may have been made on
development-level systems and there is no guarantee that these measurements
will be the same on generally available systems. Furthermore, some
measurements may have been estimated through extrapolation. Actual results
may vary. Users of this document should verify the applicable data for their
specific environment.

Trademarks
Lenovo and the Lenovo logo are trademarks of Lenovo in the United States or
other countries, or both.
Other company, product, or service names may be trademarks or service marks
of others.

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Yoga Tab 3 8 - Hardware Maintenance Manual yoga_tab_3-8_hmm_en Free User Guide for Lenovo Tablet and eReader, Manual - page3

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