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Lenovo S960, Service Manual

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Lenovo S960 Service Manual Download Page 35

LENOVO S960 Cellphone Service Manual                                                                                                                         

 

Page 35 

 

4.8  FM - search channels 

Problem: FM can’t find channels. 

Reason: WiFi/BT/GPS/FM four-in-one chip and its surrounding circuits have soldering problems. 
Troubleshooting: 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OK 

Check 

the 

solder  joints 

of 

the 

components 

of 

module 

MIC400. 

Re-solder the 

component. 

Check 

whether  the 

problem 

is 

fix. 

Replace 

main 

chip 

U201.   

N 

N 

Replace  the 

Camera 

module. 

Check 

whether 

it 

can 

take 

photos. 

Y 

Check 

the 

solder  joints 

of 

X0201, 

C0201 

and 

C0202. 

N 

Repair 

soldering, 

and 

try 

again. 

 

OK 

Y 

Can 

U613 

work 

properly 

at 

the 

frequency  of 

26MHz? 

N 

N 

N 

Y 

N 

N 

OK 

Y 

Y 

Y 

N 

Y 

Device  will 

not turn on. 

 

Check  to  see 

whether MIC 

and 

surrounding 

components 

need  to  be 

re-soldered. 

You  can’t  be 

heard  by  the 

person 

you 

are 

talking 

to. 

N Replace 

microphone. 

Check 

whether  the 

problem 

is 

fixed. 

N 

Check U201. 

OK 

Y 

Replace 

U201. 

 

Re-solder. 

Y 

Check 

the 

solder  joints 

of  B403  and 

B404. 

Re-solder. 

Test again. 

Replace  the 

receiver. 

Retry  to  see 

whether 

it 

works 

properly. 

Y 

Repair 

soldering, 

and 

try 

again. 

 

N 

You  can’t 

hear 

the 

person 

you 

are 

talking to. 

Replace 

U201. 

OK 

Check 

whether  key 

light 

current-limiti

ng 

resistor 

R910  has  a 

dry 

joint 

problem. 

Repair 

soldering. 

Try  again  to 

see  whether 

the  problem 

is fixed. 

Some 

of 

them  don’t 

light up? 

LEDs 

are 

damaged. 

Replace  the 

LEDs  which 
don’t 

light 

up. 

Keyboard 

backlight 
doesn’t  light 

up. 

Replace 

U201. 

Check 

whether  the 

position 

of 

metal  dome 

of  keys  is 

correct,  or  if 
it’s  corroded 

or  sank.  Lift 

the 

whole 

metal  dome. 

Clean 

the 

keyboard 

with  alcohol. 

Replace  the 

metal dome. 

 

OK 

Keys 

can’t 

work 

properly. 

 

Replace 

the 

battery 

and try  again 

to 

see 

whether  the 

battery 

can 

be 

fully 

charged. 

OK  Replace 

U201. 

Y 

Replace  the 

components 

of 

modules 

U301 

and 

U302

. 

Try 

again. 

Y 

N 

OK 

N 

Replace  the 

front camera. 

Check 

whether  the 

problem 

is 

fixed. 

N 

Y 

Repair 

soldering, 

and 

try 

again. 

 

OK 

Check 

the 

solder  joints 

of 

the 

components 

of 

modules 

U301 

and 

U302

.  Repair 

soldering 

and 

try 

again. 

It  shows  the 

charging 

indicator. 

But 

the 

battery  can’t 

be 

fully 

charged. 

 

N 

Re-solder  or 

replace 

U201. 

 

Y 

N 

Check 

the 

solder  joints 

of U201. 

 

OK 

N 

N 

OK 

N 

Y 

Replace  the 

battery. 

Re-solder  or 

replace 

U201. 

 

Replace  the 

battery. 

Check 

whether 

it 

can 

charge 

normally  and 
the  battery’s 

voltage 

is 

lower 

than 

3V.   

OK 

N 

N 

Y 

Check 

the 

solder  joints 

of U201. 

 

Replace 

U201. 

Check 

the 

solder  joints 

of 

the 

components 

of 

modules 

U301 

and 

U302. 
Repair 
soldering

 

and 

try 

again. 

Re-solder. 

Check 

whether  the 

problem 

is 

fixed. 

It 

doesn’t 

show 

the 

charging 

indicator 

when charger 

is 

plugged 

in. 

Replace  the 

charger. 

Y 

Replace  the 

charger. 

Check 

whether 

it 

can 

charge 

normally. 

OK 

Y 

Check 

whether 

main 

chip 

U201 

is 

damaged. 

Replace  it  if 

necessary. 

Dissemble 

the 

unit. 

Check 

whether  the 

Camera 

module 

is 

detached. 

Re-assemble 

the  module. 

Check 

whether 

it 

can 

take 

photos. 

The 

front 

camera  can’t 

take photos. 

 

Does 

the 

keyboard 

have  a  dry 

joint  or  short 

circuit 

problem? 

Re-solder. 

Check 

whether  the 

problem 

is 

fixed.  Check 

whether  the 

problem 

is 

fixed. 

Y 

OK 

 

Y 

N 

N 

Check 

the 

solder  joints 

of 

the 

Camera 

module 

connectors. 

Repair 

soldering  on 

the 

connectors. 

Check 

whether 

it 

can 

take 

photos. 

Are 

the 

spring 

pins 

of 

the 

receiver 

damaged? 

Are 

their 

contacts 

good? 

Check 

whether  the 

problem 

is 

fixed. 

Is  the  front 

camera 

normal? 

Y 

OK 

N 

Y 

Check 

whether 

audio  power 

amplifier 

U405  has  a 

dry 

joint 

problem or is 

damaged. 

Repair 

soldering  or 

replace 

it. 

Try  again  to 

see  whether 

it rings. 

Replace 

speaker. 

Retry  to  see 

whether 

it 

rings. 

 

It  does  not 

ring. 

Replace 

chip U201. 

N 

OK 

OK 

Replace  the 

motor. Check 

whether  the 

problem 

is 

fixed. 

Y 

N 

N 

N 

Check 

whether  the 

output  of  the 

backlight 

circuit  at  the 

motherboard 

end 

is 

correct. 

Is 

chip 

U801 

normal? 

Replace 

U801. 

Check 

whether  the 

solder  joints 

of  the  motor 

are  normal. 

Re-solder 

and  retry  to 

see  whether 

the  problem 

is fixed. 

It  does  not 

vibrate. 

Y 

LCD 

backlight 
doesn’t  light 

up. 

N 

Check 

whether 

connections 

between FPC 

of 

LCD 

module  and 

connectors 

on 

motherboard 

are 

good. 

Reconnect 

them.  Check 

whether 

LCD 

backlight 

works. 

 

Replace  the 

front  camera 

and 

try 

again. 

 

OK 

Check 

whether  the 

EMI 

components 

are 

integrated 

and 

check 

their  solder 

joints. Repair 

the 

EMI 

components. 

Y 

Y 

Y 

N 

OK 

OK 

OK 

OK 

N 

Y 

Y 

Can’t 

take 

photos. 

 

Y 

Replace  the 

LCD 

module. 

OK 

OK 

Check 

whether  the 

correct 

voltage 

is 

applied 

on 

the  positive 

and  negative 

backlight 

terminals  of 

the 

LCD 

module. 

Y 

OK 

Y 

N 

Motherboard 

is  damaged. 

Replace 

motherboard. 

Troubleshoot 

the 

faulty 

board. 

 

Y 

N 

OK 

 

Y 

N 

Re-solder. 

 

Y 

N 

Check 

the 

solder  joints 

of  the  Power 

On 

button. 

Does  it  have 

a  dry  joint 

problem? 

Is there a big 

current  when 

power 

supply 

of 

motherboard 

is 

the 

phone’s  only 

power source 

(connect 

TP305  to  the 

positive 

terminal,  and 

TP309 

to 

GND)? 

N 

Check 

whether  the 

connection 

of  LCD  FPC 

is 

good. 

Re-install 

FPC.  Check 

whether  the 

display 

works. 

Replace  the 

LCD 

module. 

OK 

Check 

whether  the 

EMI 

components 

in 

LCD 

channel 

on 

motherboard 

have 

dry 

joint 

problems. 

Re-solder the 

EMI 

components. 

Screen is 

blank. 

 

N 

Y 

OK 

Test 

using 

earphones.  If 
there’s sound 

in 

the 

earphones, 

then  there  is 

audio  signal 

input.  Check 

whether  the 

components 

related 

to 

module 

U405 

have 

dry 

joint 

problems. 

Re-solder. 

Check 

whether  the 

problem 

is 

fixed. 

N 

N 

OK 

 

Y 

N 

Is  the  front 

camera 

normal? 

 

OK 

 

Y 

FM can’t find channels. 

 

Does MT6628(U2306) have a dry 
joint problem? 

Does U2301 have a dry joint 
problem? 

N 

Replace main chip MT6628(U2306). 

N 

Re-solder. 

Re-solder. 

Y 

Y 

Summary of Contents for S960

Page 1: ...Lenovo S960 Service Manual Service Manual ir LENOVO ...

Page 2: ...acklight doesn t light up 20 3 6 AUDIO PROBLEMS DURING PHONE CALLS 21 3 6 1 You can t hear the person you are talking to during a phone call 21 3 6 2 You can t be heard by the person you are talking to during a phone call 22 3 7 DEVICE WILL NOT TURN ON 23 4 RADIO FREQUENCY 24 4 1 GSM CALIBRATION DURING PRODUCTION 24 4 1 1 GSM AFC calibration 24 4 1 2 GSM Rx Path Loss calibration 24 4 1 3 GSM AFC c...

Page 3: ...4 6 USE OF BLUETOOTH 34 4 7 GPS SEARCH SATELLITES AND LOCATE 34 4 8 FM SEARCH CHANNELS 35 5 HOW TO ASSEMBLE AND DISSEMBLE LENOVO S960 36 5 1 ASSEMBLY SEQUENCE OF LENOVO S960 36 5 2 DOS AND DON TS WHEN ASSEMBLING LENOVO S960 37 ...

Page 4: ......

Page 5: ...LENOVO S960 Cellphone Service Manual Page 5 1 Cellphone appearance 2 Layout of motherboard Front of motherboard ...

Page 6: ...LENOVO S960 Cellphone Service Manual Page 6 ...

Page 7: ...LENOVO S960 Cellphone Service Manual Page 7 Back of motherboard ...

Page 8: ...LENOVO S960 Cellphone Service Manual Page 8 ...

Page 9: ...LENOVO S960 Cellphone Service Manual Page 9 3 Baseband Electronic circuit diagram 3 1 LCD display 3 1 1 When the device is turned on there s nothing on screen ...

Page 10: ...rboard are good Reconnect them Check whether LCD backlight works N LCD backlight doesn t light up Check whether the output of the backlight circuit at the motherboard end is correct Check whether chip U1601 works Replace U1601 N N Screen is blank Check whether the EMI components in LCD channel on motherboard have dry joint problems Re solder the EMI components OK Replace the LCD module Check wheth...

Page 11: ...EMI components Check the solder joints of U1101 Re solder or replace U1101 N Y N Repair soldering and try again N N Replace the Camera module Check whether it can take photos Check the solder joints of the Camera module connectors Repair soldering on the connectors Check whether it can take photos N Y OK Dissemble the unit Check whether the Camera module is detached Re assemble the module Check wh...

Page 12: ...r or replace U1101 N Y N Repair soldering and try again N N Replace the Camera module Check whether it can take photos Check the solder joints of the Camera module connectors Repair soldering on the connectors Check whether it can take photos N Y OK Dissemble the unit Check whether the Camera module is detached Re assemble the module Check whether it can take photos N Y OK Check whether the module...

Page 13: ...f the motor and the peripheral components are normal Re solder and retry to see whether the problem is fixed OK Y It does not vibrate N Replace chip U1301 N Check whether the solder joints of the motor switching FPC are normal Re solder and retry to see whether the problem is fixed OK N Use a multi meter to check whether the terminal voltage difference between the two leads of the motor in the Mot...

Page 14: ... see whether it rings N Replace speaker Retry to see whether it rings Y OK Y OK It does not ring N Check whether the connections of the main FPC connectors are OK Y OK Check whether analog switch U1403 on motherboard has a dry joint problem or is damaged Repair soldering or replace it Try again to see whether it rings Y OK N Y OK Check whether the contacts between the speaker spring clips and the ...

Page 15: ...ee whether it rings Y OK Y OK It does not ring N Check whether the connections of the main FPC connectors are OK Y OK N Y OK Check whether the contacts between the speaker spring clips and the sound chamber stand are good Replace the sound chamber stand Y N N Test with earphones If there s sound in earphones then there is audio signal input Check whether the components related to the audio power a...

Page 16: ...LENOVO S960 Cellphone Service Manual Page 16 3 4 Charging 3 4 1 It doesn t show the charging indicator when charger is plugged in 1 ...

Page 17: ...ttery Check whether it can charge normally and the battery s voltage is lower than 3V Replace the battery Y N Check the solder joints of the components of the charging chip module U1302 Re solder Check whether the problem is fixed Y OK N Replace U1101 Y OK Check whether there s any rips on the battery FPC Replace the battery Y N Re fasten battery connector J1301 Check whether it can charge normall...

Page 18: ...ged N N N Check the solder joints of charging chip U1302 Repair soldering Try again Replace the components of module U1302 Try again Replace U1101 Replace the battery and try again to see whether the battery can be fully charged It shows the charging indicator But the battery can t be fully charged OK Y OK Y OK Y OK Y ...

Page 19: ...er joints of the side key FPC are normal and FPC is broken Do R1704 R1707 and R1303 have dry joint problems OK Y OK N The Power On button can t work properly Is the Voltage to Ground at PWRKEY test point TP1112 is far less than the VBAT voltage Check whether the main FPC connectors are fastened properly and FPC is broken OK Y Replace the main FPC Y Replace the main FPC N Replace PMU U1301 ...

Page 20: ...ge 20 3 5 2 Keyboard backlight doesn t light up Keyboard backlight doesn t light up Is ICON LED FPC soldered properly Re solder ICON LED FPC Is the motor switching FPC soldered properly Re solder the motor switching FPC Replace U1301 Y Y N N ...

Page 21: ...oard has a dry joint problem or is damaged Repair soldering or replace it Try again to see whether it rings N Replace the two in one speaker Try again to see whether the problem is fixed Y OK Y OK The receiver is silent N Check whether the connections of the main FPC connectors are OK Y OK Y OK Check whether the contacts between the spring clips of the two in one speaker and the sound chamber stan...

Page 22: ...rd by the person you are talking to during a phone call Re solder OK Check U1101 N You can t be heard by the person you are talking to Check to see whether MIC and surrounding components need to be re soldered Y Y Replace microphone Check whether the problem is fixed N ...

Page 23: ...ring or replace X1301 Can X1301 work properly at the frequency of 32KHz Replace main chip U1101 N Y Repair soldering and try again N Y Is there a big current when power supply of motherboard is the phone s only power source N Y Motherboard is damaged Replace motherboard Troubleshoot the faulty board Are the main FPC connectors fastened properly N Y Re fasten ...

Page 24: ...roduction 4 1 1 GSM AFC calibration Problem AFC calibration failed Reason Connections of RF test cable are not reliable during the calibration TCXO is fitted reversely or has a dry joint problem Receiving channel is open Troubleshooting Note Normally you need to re calibrate the corresponding components after the replacement 4 1 2 GSM Rx Path Loss calibration Problem Rx Path Loss calibration faile...

Page 25: ...s receiving filter U2110 have a dry joint problem Re solder Re solder repl ace couplers Do C2130 and C2131 have dry joint problems Do C2107 C2110 C2109 and C2112 have dry joint problems Check RF receiver and transmitter MT6167 U2105 or baseband chip U1101 Re solder or replace Re solder or replace dry joint problems Troubleshooting Note Normally you need to re calibrate the corresponding components...

Page 26: ...y band fail DCS PCS frequency band failed Replace corresponding components Do PA input C2207 and R2203 have solder short problem Does PA U2201 have a dry joint problem Re solder Check RF receiver and transmitter MT6167 U2105 or baseband chip U1101 Does APC circuit R2213 have a dry joint problem Re solder module s RF input circuits are shifted and shield bracket is short circuit Troubleshooting Not...

Page 27: ...lem switching spectrum may become over the limits Troubleshooting 4 2 2 Frequency Error is too big Problem Frequency Error is over the limit in whole unit test Reason TCXO s VAFC input circuit has a problem Troubleshooting Check whether the voltage of Pin18 of PA module U2201 is in the normal range Switching spectrum and Ramp Mask are over the limits Check whether input and output matching compone...

Page 28: ...have dry joint problems Or there s short circuit between these capacitors and other resistors Troubleshooting Frequency Error is over the limit Check whether X2101 is damaged or has a dry joint problem Replace components which have dry joint problems Re calibrate Phase Error is over the limit Check power feeding circuits of PA U2201 and Transceiver U2105 Replace components which have dry joint pro...

Page 29: ...ltage falls into normal range normally 3 6V 4 2V C Check whether PA s RF input C2208 R2209 C2207 and R2203 have dry joint problems D Whether PA s RF input C2210 and C2211 have dry joint problems E PA s V_ramp control signal circuit If C2209 has a dry joint or circuit break problem PA s output power will be abnormal Transceiver U2105 A Check whether power feeding voltage of Transceiver U2105 falls ...

Page 30: ...ss calibration Problem Item Rx Path Loss failed Reason Receiving channel has a problem Troubleshooting 4 3 2 WCDMA TPC calibration Problem Item TPC failed Reason Emission channel has a problem Troubleshooting Rx Path Loss failed Do PA module U2201 and RF connector CON2201 have a dry joint problem Do duplexers U2102 U2101 and their channels have dry joint problems N Y Y Y N ...

Page 31: ...ngs are reliable Do RF connector CON2201 PA module U2201 C2210 and C2211 have dry joint problems Re solder Is WCDMA PA U2202 U2203 fitted reversely Or does it have a dry joint problem Re solder Y Y Y N N N Is WCDMA RF receiver and transmitter U2105 fitted reversely Or does it have a dry joint problem Re solder Y Check U1101 N N ...

Page 32: ...oting 4 4 2 The results of PowerControl comprehensive test are not good Problem PowerControl Reason It s not calibrated or just passed the critical point of calibration Troubleshooting Re calibrate ACLR or SEM Re perform WCDMA calibration Then check whether the problem is fixed Re solder PA U2202 U2203 or replace PA and components in emission channel Then check whether the problem is fixed N Re so...

Page 33: ...rence Troubleshooting Re calibrate 4 5 WiFi test Problem Can t find WiFi Reason WiFi BT GPS FM four in one chip U2306 and its surrounding circuits have soldering problems Troubleshooting Can t find WiFi Does MT6628 U2306 have a dry joint problem Does U2301 have a dry joint problem N Replace main chip MT6628 U2306 N Re solder Re solder Y Y ...

Page 34: ...t find satellites and can t locate Reason WiFi BT GPS FM four in one chip and its surrounding circuits have soldering problems Troubleshooting Can t find BT Does MT6628 U2306 have a dry joint problem Does U2301 have a dry joint problem N Replace main chip MT6628 U2306 N Re solder Re solder Y Y GPS can t find satellites Does MT6628 U2306 have a dry joint problem Does U2301 have a dry joint problem ...

Page 35: ...e normally OK Y Check whether main chip U201 is damaged Replace it if necessary Dissemble the unit Check whether the Camera module is detached Re assemble the module Check whether it can take photos The front camera can t take photos Does the keyboard have a dry joint or short circuit problem Re solder Check whether the problem is fixed Check whether the problem is fixed Y OK Y N N Check the solde...

Page 36: ...ervice Manual Page 36 5 How to assemble and dissemble LENOVO S960 5 1 Assembly sequence of LENOVO S960 Fig 5 1 Main assembly exploded view of LENOVO S960 For details see the attachment Removal steps of S960 Battery Cover ppt ...

Page 37: ...ine on the shield cover to avoid interference with the conductive adhesive of the shield cover 5 Before assembling motherboard to the front cover assembly make sure that the silicone sleeve on the P sensor sensor is fitted properly 6 When attaching the volume key FPC to the front cover align it with the aligning frame The position must be exact 7 When attaching the foam seals of MIC and the back s...

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