Lenovo P70-A Service Manual
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Lenovo P70-A Service Manual

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Service Manual of
Lenovo P70-A Mobile
Phone
Lenovo

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Summary of Contents for Lenovo P70-A

  • Page 1 Service Manual of Lenovo P70-A 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 P70-A Mobile Phone Content 1.  Appearance ..........................5  2.  Layout of main board ......................6  3.  Baseband ..........................7  4.  Main adverse analysis ....................... 8  4.1   ........................... 8   DISPLAY 4.1.1   No display on screen after power-on ................... 8  ...
  • Page 4 Repair Manual of Lenovo P70-A Mobile Phone 4.14.3   Frequency Err........................ 31   5.  Disassembly Guide ......................32  6.  Assemble Guide ........................40 ...
  • Page 5 Prepared/ Version Prepared by/ Reason for Modified Main changes Modified by change...

  • Page 6: Appearance

    Appearance...

  • Page 7: Layout Of Main Board

    Repair Manual of Lenovo P70-A Mobile Phone Layout of main board Front of main board: Back of main board:...

  • Page 8: Baseband

    Repair Manual of Lenovo P70-A Mobile Phone Baseband Block diagram of hardware system...

  • Page 9: Main Adverse Analysis

    Repair Manual of Lenovo P70-A Mobile Phone Main adverse analysis LCD display 4.1.1 No display on screen after power‐on  White screen or blank screen without display; backlight with lighting Check the connection of LCD FPC is good and re-assembled FPC whether phone is normal Check the display is normal after replacing LCD, Check whether the EMI device Z1601--Z1605 of LCD circuit on main board is solder incompletely;...

  • Page 10: Lcd Backlight Without Lighting

    Repair Manual of Lenovo P70-A Mobile Phone 4.1.2 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 11: Camera Defects

    Repair Manual of Lenovo P70-A Mobile Phone Camera defects 4.2.1 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 Whether the camera is OK...

  • Page 12: Ring And Vibration

    Repair Manual of Lenovo P70-A Mobile Phone Ring and vibration 4.3.1 No vibration  No vibration Check whether the motor is interfered by structure; Recheck whether it is normal after reassembling the phone. Replace the motor to see whether it is ok? Check to see whether the circuit around the motor is normal(R1808，C1811)

  • Page 13: No Ring

    Repair Manual of Lenovo P70-A Mobile Phone 4.3.2 No ring  No ring Replace Speaker and recheck whether it is normal? Check to see whether the SPK circuit is normal?(D1405,D1406,C1413,B1405,B1406,R 505,R506) Use earphone to test whether there is sound; if there is sound from earphone, there is audio signal to input.

  • Page 14: Charging

    Repair Manual of Lenovo P70-A Mobile Phone Charging 4.4.1 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 (J801). Replace the battery and see whether the Replace the battery...

  • Page 15: Charging Shown But Not Full Charging

    Repair Manual of Lenovo P70-A Mobile Phone 4.4.2 Charging shown but not full charging  Charging shown but not full charging Replace the battery and then check whether it is fully charged Re-solder the USB connector Check to see the Voltage of VCHG is or change for another FPC ;...

  • Page 16: Keyboard And Keyboard Backlight

    Repair Manual of Lenovo P70-A Mobile Phone Keyboard and keyboard backlight 4.5.1 Abnormal operation of side keys  Abnormal side key Check whether there are conditions like cold solder joint and short circuit on keyboard FPC ? Whether it is ok after re-welding? FPC is fracted, Replace...

  • Page 17: Abnormal Operation Of Ctp Keyboard

    Repair Manual of Lenovo P70-A Mobile Phone 4.5.2 Abnormal operation of CTP keyboard  CTP keyboard is invalid CTP damaged, Whether the CTP test is normal? replace it Replace one CTP to see whether Replace CTP it is the problem of touch screen or main board?

  • Page 18: Calling

    Repair Manual of Lenovo P70-A Mobile Phone Calling 4.6.1 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 whether there is voice? chip(U503) or main chip(U503) is abnormal...

  • Page 19: No Voice Heard From Your Side During The Call

    Repair Manual of Lenovo P70-A Mobile Phone 4.6.2 No voice heard from your side during the call  No voice heard from your side during the call Check whether receiver and the peripheral devices are Re-weld well welded; whether it is ok after re-welding? Check whether receiver module device is well welded.

  • Page 20: Power-On Failure

    Repair Manual of Lenovo P70-A 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 21: Lcd On When Close To The Ear During The Call ; Lcd Off When Away From The Ear

    Repair Manual of Lenovo P70-A 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-sensor FPC Check whether P-Sensor related circuit is Problem...

  • Page 22: Radio Frequency (Rf)

    Repair Manual of Lenovo P70-A Mobile Phone Radio frequency (RF) 4.10 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 23: Production Calibration

    Repair Manual of Lenovo P70-A Mobile Phone 4.11 Production calibration 4.11.1   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 24: Agc

    Repair Manual of Lenovo P70-A Mobile Phone 4.11.2   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 25: Apc

    Repair Manual of Lenovo P70-A Mobile Phone 4.11.3   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 26 Repair Manual of Lenovo P70-A 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 27: Fault In Complete Set Test/ Rework

    Repair Manual of Lenovo P70-A Mobile Phone 4.12 Fault in complete set test/ rework 4.12.1   Switch spectrum & PVT template with excessive  standard  　 Fault: The switch spectrum and PVT template of GSM and DCS frequency bands are excessive. 　 Cause: The cold solder joint or damage to components in V_ramp of PV may result in the excessive switch spectrum.

  • Page 28: High Frequency Error

    Repair Manual of Lenovo P70-A Mobile Phone 4.12.2   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 X801 is in cold solder...

  • Page 29: Power Output Problems

    Repair Manual of Lenovo P70-A Mobile Phone Excessive Phase Error Check the power supply part of PA（and transceiver cold Replace the elements in solder joint 4.12.4   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 30: 4G Forecast

    Repair Manual of Lenovo P70-A 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 31 Repair Manual of Lenovo P70-A Mobile Phone Check whether RF cable and fixtures are Reconnect and well connected? calibration Whether Rf connector J1001 ， Tx module U901 and the surrounding circuit devices are Re-weld in cold solder joint？ Whether 3G/4G PA U901...

  • Page 32: 4G Comprehensive Test

    Repair Manual of Lenovo P70-A Mobile Phone 4.14 3G/4G comprehensive test 4.14.1   ACLR or SEM  Fault: ACLR or SEM Cause: No calibration or PA （U901,U902） is in cold solder joint; check the Point problem circuit components or RF transceiver (U801) doesn’t work well.
  • Page 33 Repair Manual of Lenovo P70-A Mobile Phone Disassembly Guide （1） Remove the battery cover Divides the battery cover is separated from B shell from your mobile phone at the bottom right hand, as shown in figure 1 and 2 Figure 1...
  • Page 34 Repair Manual of Lenovo P70-A Mobile Phone （2） Remove the screws Use a screwdriver to take out the 8 screws, 8 red circle marked, as shown in figure 3. Figure 3 （3） Remove the B shell Break open outward the top right corner to B shell. According to the order(1-4) of the figure 4 in turn to open B shell.
  • Page 35 Repair Manual of Lenovo P70-A Mobile Phone Apart after B shell as shown in figure 5, and then remove the red circle marked two screws of antenna pedestal. Figure 5 （4） Separate the A shell and PCB mainboard LCD/motor/TP/side key/camera/battery FPC.
  • Page 36 Repair Manual of Lenovo P70-A Mobile Phone （5） Remove the mainboard. Remove the antenna bracket on mall plate, then remove the battery and the main board and small plate connection coaxial line. Use the screwdriver loosen three screws(shown as the figure 7,8,9)from A shell motherboard, Loosen screws from small plate, also will be motherboard cock as a whole.
  • Page 37 Repair Manual of Lenovo P70-A Mobile Phone Figure 9...
  • Page 38 Repair Manual of Lenovo P70-A Mobile Phone （6） Remove the telephone receiver Take off the receiver from A shell with forceps, don't bend the shrapnel. Remove the light induced rubber lining,as shown in figure 10. Figure 10 （7） Remove the TP Oven heated the TP (temperature at 80℃...
  • Page 39 Repair Manual of Lenovo P70-A Mobile Phone Figure 12 Figure 13 （8） Remove the motor/camera/FPC side key Use the soldering iron to remove the motor wire/side key FPC from the motherboard,as shown in figure 14.
  • Page 40 Repair Manual of Lenovo P70-A Mobile Phone Figure 14...
  • Page 41 Repair Manual of Lenovo P70-A Mobile Phone （9） The motor/camera/side key FPC samples as shown in the figure 15 Figure 15 Assemble Guide Please refer to disassembly Guide , assembly process in contrary to the disassemble process.

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