Lenovo A859 Service Manual
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Lenovo A859 Service Manual

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

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Summary of Contents for Lenovo A859

  • Page 1 Lenovo WW Service TS Service Manual of Lenovo A859 Mobile Phone LENOVO...
  • Page 2 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.

  • Page 3: Table Of Contents

    Repair Manual of Lenovo S920 Mobile Phone Content APPEARANCE ..........................6 LAYOUT OF MAIN BOARD ......................7 BASEBAND ........................... 9 ......................... 10 DISPLAY 3.1.1 No display on screen after power-on ................. 10 3.1.2 LCD backlight without lighting ..................11 ........................12 AMERA DEFECTS 3.2.1...
  • Page 4 Repair Manual of Lenovo S920 Mobile Phone STRUCTURE ASSEMBLY ......................23 ......错误!未定义书签。 5.1 A A859 SSEMBLY PROCESS SEQUENCE OF ENOVO MAIN BODY ........错误!未定义书签。 5.2 P S820 RECAUTIONS IN ENOVO MAIN BODY ASSEMBLY 错误!未定义书签。 5.3 P A859 RECAUTIONS IN DISASSEMBLY OF...
  • Page 5 Lenovo WW Service TS Prepared/ Version Prepared by/ Reason for Modified Main changes Modified by change...

  • Page 6: Appearance

    Lenovo WW Service TS 1. Appearance...

  • Page 7: Layout Of Main Board

    Repair Manual of Lenovo S920 Mobile Phone 2. Layout of main board Front of main board:...
  • Page 8 Repair Manual of Lenovo S920 Mobile Phone Back of main board:...

  • Page 9: Baseband

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

  • Page 10: Lcd Display

    Repair Manual of Lenovo S920 Mobile Phone 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 connection of LCD FPC is good and re-assembled FPC phone is normal...

  • Page 11: Lcd Backlight Without Lighting

    Repair Manual of Lenovo S920 Mobile Phone 3.1.2 LCD backlight without lighting LCD backlight without lighting 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 Re-verify whether the LCD backlight is normal after replacing LCD.

  • Page 12: Camera Defects

    Repair Manual of Lenovo S920 Mobile Phone Camera defects 3.1.3 Rear camera defects Can not take photos Check to see whether the camera module is in the right position by disassembling and whether the module is OK after reassembling module...

  • Page 13: Front Camera Defects

    Repair Manual of Lenovo S920 Mobile Phone 3.1.4 Front camera defects Can not take photos Check to see whether the front camera abnormal After replacing it, Check whether E1612, E1609 is well welded. Re-weld or replace Check whether the U1201...

  • Page 14: Ring And Vibration

    Repair Manual of Lenovo S920 Mobile Phone Ring and vibration 3.1.5 No vibration No vibration Check whether the motor is interfered by structure; Recheck whether it is normal after reassembling the phone. Replace the motor or main FPC to see whether it is ok? Check to...

  • Page 15: No Ring

    Repair Manual of Lenovo S920 Mobile Phone 3.1.6 No ring No ring Replace Speaker and recheck whether it is normal? Check to see whether the SPK contact shrapnel is normal? Replace main FPC and check whether it is OK .

  • Page 16: Charging

    Repair Manual of Lenovo S920 Mobile Phone Charging 3.4.1 No charging display after plugging the charger in No charging display after plugging the charger in Check whether the charging is normal Replace the charger after replacing the charger. Replace the battery and see whether the...

  • Page 17: Charging Shown But Not Full Charging

    Repair Manual of Lenovo S920 Mobile Phone 3.4.2 Charging shown but not full charging Charging shown but not full charging Replace the battery and then check whether it is fully charged Check to see whether R1305 is well There charging welded.

  • Page 18: Ctp Keyboard

    Repair Manual of Lenovo S920 Mobile Phone Keyboard 3.5.1 Abnormal operation of CTP keyboard CTP keyboard is invalid CTP keyboard is invalid CTP damaged, Whether the CTP test is normal? replace it Replace one CTP to see whether Replace CTP...

  • Page 19: Calling

    Repair Manual of Lenovo S920 Mobile Phone Calling 3.6.1 No voice heard from the other side during the call No voice heard from the other side during the call Cold solder joint Use earphone and hands-free to verify of main chip or...

  • Page 20: No Voice Heard From Your Side During The Call

    Repair Manual of Lenovo S920 Mobile Phone 3.6.2 No voice heard from your side during the call 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?

  • Page 21: Power-On Failure

    Repair Manual of Lenovo S920 Mobile Phone Power-on failure Failed to Power-on Check whether the power key FPC is Re-weld assembled well , reassembling the power FPC ? Power on the phone on separate main The main board is damaged;...

  • Page 22: Lcd On When Close To The Ear During The Call ; Lcd

    Repair Manual of Lenovo S920 Mobile Phone LCD on when close to the ear during the call; LCD off when away from the ear. Abnormal display of LCD during the call. p-sensorFPC Check whether P-Sensor related circuit is Problem normal? Or replace p-sensorFPC...

  • Page 23: Radio Frequency (Rf)

    Repair Manual of Lenovo S920 Mobile Phone 1. Radio frequency (RF) 4.1 Software Download Failure  Faults: Software can’t be normally downloaded.  Reason: Baseband chip is oppositely pasted or is in cold solder joint; CRYSTAL is oppositely pasted (no clock signal) or is in cold solder joint.

  • Page 24: Production Calibration

    Repair Manual of Lenovo S920 Mobile Phone 4.2 Production calibration 4.2.1 AFC calibration  Fault: AFC calibration Fail.  Reason: RF test cable is not connected well during calibration; TCXO is oppositely pasted or in cold solder joint.  Shooting:...

  • Page 25: Agc

    Repair Manual of Lenovo S920 Mobile Phone 4.2.2 AGC  Fault: AGC calibration Fail.  Reason: RF test cable is not connected well during calibration; the devices in receiving cable are in cold solder joint (such as RF connectors, antenna switch, saw the filter and the surrounding capacitance).

  • Page 26: Apc

    Repair Manual of Lenovo S920 Mobile Phone 4.2.3 APC Fault 1  Fault: APC calibration Fail.  Cause: RF test cable is not connected well during calibration; PA is oppositely pasted; PA and peripheral circuit are in cold solder joint; The patch of RF input circuit of PA is deviated with short-circuit shield box.
  • Page 27 Repair Manual of Lenovo S920 Mobile Phone Fault 2:  Fault: The output power of the mobile phone is too high.  Cause: The cable isn't well connected in calibration.  Shooting: Calibration power is too high Check RF cable and fixtures to...

  • Page 28: Fault In Complete Set Test/ Rework

    Repair Manual of Lenovo S920 Mobile Phone 4.3 Fault in complete set test/ rework 4.3.1 Switch spectrum & PVT template with excessive standard  Fault: The switch spectrum and PVT template of GSM and DCS frequency bands are excessive. ...

  • Page 29: High Frequency Error

    Repair Manual of Lenovo S920 Mobile Phone 4.3.2 High Frequency Error  Fault: Frequency Error exceeds standard in complete set test.  Cause: There is problem in VAFC input circuit of TCXO.  Shooting: Excessive Frequency Error Recalibrate Check whether U2104 is in cold...

  • Page 30: Power Output Problems

    Repair Manual of Lenovo S920 Mobile Phone Excessive Phase Error 带格式的: 英语(美国) Check the power supply part of PA （U2102） and transceiver （U2101） cold Replace the elements in solder joint 4.3.4 Power output problems  Fault: Normally power-on and receive, but when outputting two frequency bands or single frequency band power, there is no input power or the input power is very low.

  • Page 31: Wcdma Forecast

    Repair Manual of Lenovo S920 Mobile Phone If it is possible to repair the complete set, the output power of each module on transmission channel can be detected through spectrum analyzer probes when keeping the phone in the constant state of maximum power. Under normal circumstances, A.
  • Page 32 Repair Manual of Lenovo S920 Mobile Phone Check whether RF cable and fixtures are Reconnect and well connected? calibration Whether Rf connector CON2101，Tx module U2201 and the surrounding circuit devices are Re-weld in cold solder joint？ Whether WCDMA Re-weld U2102 is oppositely pasted...

  • Page 33: Wcdma Comprehensive Test

    Repair Manual of Lenovo S920 Mobile Phone 4.5 WCDMA comprehensive test 4.5.1 ACLR or SEM Fault: ACLR or SEM 带格式的: 英语(美国) Cause: No calibration or WCDMA PA （U2202） is in cold solder joint; RF transceiver (U2101) doesn’t work well. Repair manner:...
  • Page 34 Repair Manual of Lenovo S920 Mobile Phone 5 Structure assembly 5.1 Assembly 1.main pcb assembly 20.volume key 22.P-sensor Silica gel 19.power key 6.0.3M sub camera 11.P-sensor FPC 4.5M main camera 8.receiver 40.sub camera foam 12.volume key FPC 21.light guidance 18.camera lens 39.earphone mylar...
  • Page 35 Repair Manual of Lenovo S920 Mobile Phone the bracket. Assemble PS rubber sleeve onto PS. Snap BB conn of main FPC to sub PCBA. Snap the plug of RF cable to the socket on sub PCBA. （5）Assemble LCD to front housing assembly.
  • Page 36 Repair Manual of Lenovo S920 Mobile Phone The FPC should be bended gently when assembling to front housing. （5） Assembly Cable line in right place to prevent rear housing flattening cable line （6）Speaker should be assembled with the right orientation.

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