Lenovo VIBE X2 Скачать руководство пользователя страница 10 | Manualshive

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10

3.

Troubleshooting Procedure

3.1 No boot

Cannot boot

Check the 19.2MHz crystal is
normal?

N

Y

Check the crystal SMT is normal?
Heat the crystal then try it again.

Give the 4v on the PCBA vbat pin but not
power on the phone, is there any
Overload current() in the PCBA?

N

Y

PCBA is bad,

change it.

N

Y

Check the battery connector

SMT is normal?

Heat the battery connector
then try it again.

Check the Key FPC assembly
&Change the power key FPC

Y

the phone can power on, the
root cause is Key FPC.

Connect the phone to the computer through
the USB line, check the computer device
manager if there is equipment pops up.

Y

Download software and

try power on it again.

N

N

Check PMIC provide power supply

to CPU and EMMC are normal?

N

Heat the PMIC or
change the PMIC.

Change memory chip U1502

Y

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Содержание VIBE X2

Страница 1: ...1 Lenovo X2 Service Manual LENOVO ...

Страница 2: ...t 10 3 2 Touch panel have no effect 11 3 3 Charging anomaly 12 3 4 Calling receiver sound has poor quality 14 3 5 Speaker has no sound 15 3 6 LCD has no display 16 3 7 Phone crash 18 3 8 Key has no effect 19 3 9 Communication signal abnormality 20 3 10 Calling receiver has no sound 21 3 11 Microphone has no effect 22 3 12 Display color distortion 23 3 13 Speaker tone distortion 24 3 14 Speaker ton...

Страница 3: ...le guide 1 Take out the sim tray 2 Disassemble the bottom of decoration Use tweezer from the top of decoration and the battery cover gap the back right side with the red spot mentioned below released the hooks remove the decoration 3 Disassemble the rear housing assemble ...

Страница 4: ... from destroy the disassemble bar insert just about 2mm Using the disassemble bar to pry hooks Released the hook1 from the lower left corner The direction of from bottom to top to released the hooks 4 Disassemble the main board Disassemble the battery connector pressure Release the battery connector sheet steel 2 screws ...

Страница 5: ...nd main FPC Remove screws as the solid red dots position 5 Disassemble the sub board Remove the SPK BOX 3 screws red arrow board Remove the RF cable connector from sub Remove the sub board slowly pay attention to protect the shrapnel and the hook The solid red ...

Страница 6: ...ots location 6 Disassemble battery If you want disassemble the battery need to pull out the battery adhesive The red arrow location 1 2 The phone assemble guide Assemble and disassemble process is opposite ...

Страница 7: ...7 2 Main board and Sub FPC layout introduction 2 1 Main board top view ...

Страница 8: ...8 2 2 Main board bottom view 2 3 Sub board top view ...

Страница 9: ...9 2 4 Sub board bottom view ...

Страница 10: ... it N Y Check the battery connector SMT is normal Heat the battery connector then try it again Check the Key FPC assembly Change the power key FPC Y the phone can power on the root cause is Key FPC Connect the phone to the computer through the USB line check the computer device manager if there is equipment pops up Y Download software and try power on it again N N Check PMIC provide power supply t...

Страница 11: ...o respond Change the lcd Tp model Touch panel is not good change it Check the lcd connect J1601 Is there any smt problem Y N Heat the touch panel connector and EMI filter Change CPU chip Check the I2C controller line signal by the oscilloscope N N Y ...

Страница 12: ... respond N Y Measure the battery voltage whether it is less than 3V Replace the battery Y N Change the sub board N Change the charger adapter and usb cable Y Change the main fpc and Check the main connector J1701 Main fpc problem Sub problem check the sub board Y N Check the charge ic u1302 s out put and in put voltage Y Change the U1302 ...

Страница 13: ...eplace the usb cable The USB cable is plugged in without any respond N Y Check is there any charger respond This is no charge problem NO Y Change the sub board N Change the usb cable Y Change the main fpc and Check the main connector J1701 Main fpc problem Sub problem check the sub board Y N Change the U1001 ...

Страница 14: ...ks the SMT quality of bead Whether these parts are SMT good The phone is work good after heating these parts Measure the receiver s resistance is the value 32ohm Check the contact is good between receiver spring and contact point Re assemble the receiver and whether the phone work is good Y OK Replace the receiver N Y ...

Страница 15: ...BEAD on the Sub board Whether these parts are SMT good The phone is work good after heating these parts N Replace the speaker and then does the phone work normal Whether the speaker spring is normal Y OK Speaker has no sound N OK Y Replace the Sub FPC and then does the phone work normal Y Replace the Sub FPC N ...

Страница 16: ...t is good Checks the SMT quality of these EMI filter Whether these parts are SMT good OK Checks the U1603 s output voltage The SMT of LCD connector and EMI filter is not normal N N Y OK Y Replace the LCD whether the screen display is normal N OK Y Y Heat tU1603 or change it N Replace the CPU U1001 ...

Страница 17: ...Checks the backlight current And found out the problem And change the smt part Y N Y Y Check whether the connection status between the LCD module FPC connector and the motherboard connector is normal and reconnect the connector whether the phone is working normal N LCD has no backlight Replace the LCD module and make sure whether the LCD has the backlight OK Y N OK ...

Страница 18: ...he PMIC Connecting the phone and computer through USB line check whether some new device was found in the computer N Phone crash N Download software Heat the crystal then try it again Check the 19 2MHz crystal is normal N Replace the memery U1502 whether the phone is working normal OK Y N Change CPU chip U1001 ...

Страница 19: ... Check whether the connection status between the key FPC and the motherboard connector is normal and reconnect the connector whether the phone is working normal Press the key button make sure whether the key signal line short to ground net N Replace the key FPC Y OK Y ...

Страница 20: ...I number Check whether the connection status between the ANT cable and the RF connector is normal and reconnect the connector whether the phone is working normal Y reconnect the connector Y Write the SN or IMEI number Y Find the issue part according to the download tool message Check the modem circuit and whether the intermediate frequency is good N N Communication signal abnormality ...

Страница 21: ...s the value 32ohm Replace the receiver Check whether the contact is good between receiver spring and contact point Re assemble the receiver and whether the phone work is good N Checks the SMT quality of these BEAD Whether these parts are SMT good The phone is work good after heating these parts Replace the codec IC Y OK ...

Страница 22: ...rophone has no effect OK ＯＫ Replay PMIC U1301 N N MIC no effect Checks the SMT quality of parts around the MCI Y Y Y Check the sub board connector and main fpc And change the sub board and fpc OK Change the MIC N ...

Страница 23: ...n Display color distortion OK Y OK Y OK Y The SMT of LCD connector and EMI filter is not normal N Replace the LCD whether the screen display is normal Check the U1603 s out put voltage And change the U1603 N N Replace the CPUU1001 N ...

Страница 24: ...MT quality of BEAD on the Sub board and Whether these parts are SMT good The phone is work good after heating these parts N Replace the speaker and then does the phone work normal Whether the speaker spring is normal Y OK N OK Y Replace the Main FPC and then does the phone work normal Y Replace the Main FPC N ...

Страница 25: ... quality of BEAD on the Sub board and Whether these parts are SMT good The phone is work good after heating these parts N Replace the speaker and then does the phone work normal Whether the speaker spring is normal Y OK N OK Y Replace the Main FPC and then does the phone work normal Y Replace the Main FPC N ...

Страница 26: ...r it is less than 3V Replace the battery Y N Change the sub board N Change the charger adapter and usb cable Y Change the main fpc and Check the main connector J1701 Main fpc problem Sub problem check the sub board Y N Check the charge ic u1302 s out put and in put voltage Y Change the U1302 ...

Страница 27: ...fect No effect OK Check EMI filter and SMT is OK N Y N Y Reheat it N Replace Camera module is OK Check the SMT quality of Camera connect and reheat it is OK N Y OK Check Camera module connecting is ok N Y OK Check the CPU SMT quality is OK Reheat and Replace ...

Страница 28: ...t OK Check EMI filter and SMT is OK N Y N Y Reheat it N Replace Camera module is OK Check the SMT quality of Camera connect and reheat it is OK N Y OK Check Camera module connecting is ok N Y OK Check the CPU SMT quality is OK Reheat and Replace ...

Страница 29: ... again Check battery temperature detection pin connector is good Using power source supply power any overload current Y Check and found out the over current parts Charging battery or replace the connect Y Check SW vision SN IMEI N N Modem chip is ok Y N Charging is OK Check charge chip is ok Y N Check CPU is ok ...

Страница 30: ...cted Y Y OK Check SN IMEI have be written Change SIM card Check the sim card current in the main board found out open current Y OK Change new SIM card Y N Change the U1001 and U1901 N Rewrite SN and IMEI number N Change SIM tray Y Change new SIM tray ...

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