Lenovo A859 User manual

Lenovo WW Service TS
Service Manual of
Lenovo A859 Mobile
Phone
LENOVO

Repair Manual of Lenovo S920 Mobile Phone
2
Document name Service Manual of Lenovo A859Mobile Phone
Version: V100
Date: Dec. 19, 2013
Document No.:
Status:
Preface
This manual is intended for online repair guidance and after-sale repair guidance of
Lenovo A859 mobile phone produced by the Company
The content of this manual will be upgraded according to the needs of technology
development.
Copyright
The copyright of this manual belongs to Lenovo Mobile; anyone who reproduces this
manual without written consent of the Company shall bear legal responsibility.

Repair Manual of Lenovo S920 Mobile Phone
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Content
1. APPEARANCE..............................................................................................................................6
2. LAYOUT OF MAIN BOARD........................................................................................................7
3. BASEBAND...................................................................................................................................9
3.1 LCD DISPLAY .........................................................................................................................10
3.1.1 No display on screen after power-on.................................................................................10
3.1.2 LCD backlight without lighting ......................................................................................... 11
3.2 CAMERADEFECTS...................................................................................................................12
3.2.1 Rear camera defects ..........................................................................................................12
3.2.2 Front camera defects .........................................................................................................13
3.3 RING AND VIBRATION..............................................................................................................14
3.3.1 No vibration.......................................................................................................................14
3.3.2 No ring...............................................................................................................................15
3.4 CHARGING..............................................................................................................................16
3.4.1 No charging display after plugging the charger in ............................................................16
3.4.2 Charging shown but not full charging................................................................................17
3.5 CTPKEYBOARD......................................................................................................................18
3.5.1 Abnormal operation of CTP keyboard ...............................................................................18
3.6 CALLING.................................................................................................................................19
3.6.1 No voice heard from the other side during the call ............................................................19
3.6.2 No voice heard from your side during the call ...................................................................20
3.7 POWER-ON FAILURE................................................................................................................21
3.8 LCD ON WHEN CLOSE TO THE EAR DURING THE CALL;LCD OFF WHEN AWAY FROM THE EAR.22
4. RADIO FREQUENCY (RF)...........................................................................错误!未定义书签。
4.1 SOFTWARE DOWNLOAD FAILURE .....................................................................错误!未定义书签。
4.2 PRODUCTION CALIBRATION..............................................................................错误!未定义书签。
4.2.1 AFC calibration....................................................................................... 错误 ! 未定义书签。
4.2.2 AGC......................................................................................................... 错误 ! 未定义书签。
4.2.3 APC ......................................................................................................... 错误 ! 未定义书签。
4.3 FAULT IN COMPLETE SET TEST/REWORK...........................................................错误!未定义书签。
4.3.1 Switch spectrum & PVT template with excessive standard ..................... 错误 ! 未定义书签。
4.3.2 High Frequency Error............................................................................. 错误 ! 未定义书签。
4.3.3 High Phase Error.................................................................................... 错误 ! 未定义书签。
4.3.4 Power output problems ........................................................................... 错误 ! 未定义书签。
4.4 WCDMAFORECAST.........................................................................................错误!未定义书签。
4.4.1 RSSI_Cal ................................................................................................. 错误 ! 未定义书签。
4.4.2 TPC_Cal.................................................................................................. 错误 ! 未定义书签。
4.5 WCDMACOMPREHENSIVE TEST......................................................................错误!未定义书签。
4.5.1 ACLR or SEM.......................................................................................... 错误 ! 未定义书签。
4.5.2 ILPC comprehensive test abnormal ........................................................ 错误 ! 未定义书签。
4.5.3 FrequencyErr .......................................................................................... 错误 ! 未定义书签。

Repair Manual of Lenovo S920 Mobile Phone
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5. STRUCTURE ASSEMBLY ........................................................................................................23
5.1ASSEMBLY PROCESS SEQUENCE OF LENOVO A859 MAIN BODY ........................错误!未定义书签。
5.2 PRECAUTIONS IN LENOVO S820 MAIN BODYASSEMBLY...................................错误!未定义书签。
5.3 PRECAUTIONS IN DISASSEMBLY OF LENOVO A859 MAIN BODY FOR REPAIRING 错误!未定义书签。

Lenovo WW Service TS
Version
No.
Prepared by/
Modified by
Prepared/
Modified
on
Reason for
change
Main changes

Lenovo WW Service TS
1.Appearance

Repair Manual of Lenovo S920 Mobile Phone
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2. Layout of main board
Front of main board:

Repair Manual of Lenovo S920 Mobile Phone
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Back of main board:

Repair Manual of Lenovo S920 Mobile Phone
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3. Baseband
Block diagram of hardware system

Repair Manual of Lenovo S920 Mobile Phone
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LCD display
3.1.1 No display on screen after power-on
White screen or blank screen without display; backlight
with lighting
Check whether the EMI device E1601,E1602,
E1603，E1608，E1611 of LCD circuit on main
board is welded incompletely; re-weld EMI
device
OK
Check whether there is cold solder joint on other
device around LCD and on LCD connector.
Check whether the connection of LCD FPC is
good and re-assembled FPC phone is normal
N
N
Y
OK
Y
Check whether the display is normal after
replacing LCD,
N
OK
Y

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3.1.2 LCD backlight without lighting
Check whether there are voltages more than
20V between both ends of C1606 when LCD
is lit.
OK
If the backlight circuit is
normal, it is the problem
of LCD
Check the welding condition of U1601
and peripheral devices, including
L1601, D1601, C1606,C1604，R1606,
R1608，R1609，R1620,C1607,C1605
Y
N
Y
Y
OK
Check whether the connection of FPC on
LCD module and connector on main board is
good and whether the LCD backlight is
normal after reconnection
N
Re-verify whether the LCD backlight is
normal after replacing LCD.
OK
Y
N
LCD backlight without lighting

Repair Manual of Lenovo S920 Mobile Phone
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Camera defects
3.1.3 Rear camera defects
OK
Check to see whether the EMI
device is complete and welding is
in good condition; if not; repair
EMI device
Recheck after replacing front
camera
Check to see whether
the front camera is
abnormal
N
Y
N
N
Recheck after overlaying welding
Y
N
Whether the camera is OK
after replacing the camera
module
Check to see whether the camera
module connector is welded well;
whether the camera is OK after
overlaying welding the connector?
N
Y
OK
Check to see whether the camera
module is in the right position by
disassembling and whether the module
is OK after reassembling module
N
Y
OK
Check to see whether the main
chip U1201 are normally
welded?
Re-weld or replace U1201
N
Can not take photos

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3.1.4 Front camera defects
Can not take photos
Check whether the U1201
and are normally welded?
Re-weld or replace
U1201 and U1302
N
Check whether E1612,
E1609 is well welded.
N
Y
OK
Check to see whether the front
camera is abnormal After
replacing it,
N
Y
OK

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Ring and vibration
3.1.5 No vibration
Replace the motor or main FPC
to see whether it is ok? Check to
see whether the circuit around the
motor is normal
OK
Y
N
Check whether the motor is interfered by
structure; Recheck whether it is normal after
reassembling the phone.
OK
Y
No vibration
N
Replace U1302 chip
N

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3.1.6 No ring
Check to see whether the main chip U1302 is
damaged. Replace it if damaged.
N
Replace main FPC and check whether it is OK .
Check whether main FPC connector is welded
well
N
Replace Speaker and recheck whether it is
normal?
Check to see whether the SPK contact
shrapnel is normal?
Use earphone to test whether there is sound; if
there is sound from earphone, there is audio
signal to input. Check whether U1201 module
device is of cold solder joint; recheck whether it
is ok after re-welding,
OK
OK
OK
Y
Y
Y
N
No ring

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Charging
3.4.1 No charging display after plugging the charger in
Check whether the charging is normal
after replacing the charger.
Replace the charger
No charging display after
plugging the charger in
N
Y
Replace the battery and see whether the
charging is normal? Measure the battery
voltage to see whether it is less than 3V
Replace the battery
Y
N
Check to see whether U1301 module
device is well welded? Whether it is
normal after re-welding
Y
OK
N
Replace U1302
Y
OK

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3.4.2 Charging shown but not full charging
Check to see whether R1305 is well
welded. During charging, measure
whether the voltage between both ends
of R1305 is over 68mV
Replace U1301 module device and
then recheck
Replace U1302
Replace the battery and then check whether it
is fully charged
Charging shown but not
full charging
OK
Y
N
N
N
OK
Y
OK
Y
There is charging
current; go to check the
battery.
Y

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Keyboard
3.5.1 Abnormal operation of CTP keyboard
CTP keyboard is invalid
Whether the CTP test is normal?
It is the problem of CTP connector
J1603or main chip U1201 welding
CTP damaged,
replace it
Y
Replace CTP
Y
N
N
Replace one CTP to see whether
it is the problem of touch screen
or main board?
CTP keyboard is invalid

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Calling
3.6.1 No voice heard from the other side during the call
No voice heard from the other
side during the call
Replace the headphones and then
rechek whether it is normal
N
Y
OK
N
Replace U1201
Check whether B1401,B1403 are well
welded. Re-weld and test
Use earphone and hands-free to verify
whether there is voice?
N
Cold solder joint
of main chip or
main chip is
abnormal
Y
Y
OK

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3.6.2 No voice heard from your side during the call
Re-weld
ＯＫ
Check U1201
N
N
No voice heard from your side during the call
Check whether MIC and the peripheral devices are
well welded; whether it is ok after re-welding?
Y
Y
Y
Check whether MIC module device is well
welded. Re-welded this device and see whether it
is ok?
OK
Whether it is ok after replacing SUB
board?
N
Whether it is ok after replacing main FPC?
N
Y
OK