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Micromax Ninja A91 Service Manual

L1 & l2
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A91
L1 & L2 service manual
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Summary of Contents for Micromax Ninja A91

  • Page 1 L1 & L2 service manual...
  • Page 2 content  1、 Product introduce..………..p3-p4  2、 Disassembly guide ……….p5-p19  3、Structure parts diagram…..p20-p21  4、 Repairing guide …………...p22-p32...

  • Page 3: Product Introduce

    Product introduce...
  • Page 4 Product introduce ： Model Product size： 130×66×10mm Platform： MTK 6577 ，dual-core 1.0GHz Memory： 4GB+512MB (Nand&sdram+RAM） System： Android 4.0 Frequency band:dual-SIM WCDMA：2100MHz，GSM900/1800/1900 MHZ Battery： 1800mAh Travel charger charger: MICRO 5PIN USB cable: 3.5jack earphone： LCD&TP： 4.5FWVGA,TN, resolution:480*854，Capacitance TP multi-point touch（2 point） Camera：0.3M and 5.0M CMOS Support：GPS，...

  • Page 5: Disassembly Guide

    Disassembly guide 1. Tools list Tweezer /Cross screw driver/ Solder/Tommy bar/hot gun Tommy bar Tweezer Cross Screw driver Solder iron Hot gun...
  • Page 6 Disassembly guide 2. Battery caver disassembly ， as the Fig. 1 open the battery cover Battery cover Fig. 1...
  • Page 7 Disassembly guide 3. Back caver disassembly ，as the Fig.2； 1） Unscrew 10 screws in back cover Fig. 2...
  • Page 8 Disassembly guide ，as the Fig.3； 2） Disassemble back cover with Tommy bar Back cover Fig. 3...
  • Page 9 Disassembly guide 4.Main board and front cover disassembly ，as the fig.4； 1） The main components of distribution LCD con. RF cable Sub PCBA SIM con. TP con. Earphone con. USB con. 5.0M CAM. Main PCBA vibrator Battery con. Main FPC T card con.
  • Page 10 Disassembly guide 2）remove two screws and open the volume key FPC & LCD con.& TP con. ， as the fig.5； TPcon. LCDcon. Volume key Fig.5...
  • Page 11 Disassembly guide 3）remove the power key FPC and RF cable con. and 5M camera, as the FIG. 6 Power key RF cable con. 5M camera Fig.6...
  • Page 12 Disassembly guide 4）open the main board And main FPC con..as the FIG.7 Main FPC con. Main board Fig.7...
  • Page 13 Disassembly guide 5. 0.3M camera & light sensor disassembly remove the light sensor and 0.3M camera，as the fig.8； Light sensor&holder 0.3M cam. Light sensor con. Sensor holder Light sensor Fig.8 0.3M cam. CON.
  • Page 14 Disassembly guide 6.Power key FPC & volume key FPC disassembly remove the power key FPC and volume key FPC with the iron，as the fig.9； Power key Volume key Fig.9...
  • Page 15 Disassembly guide 7. 5M camera &receiver disassembly remove the receiver and speaker，as the FIG.10； speaker receiver Fig.10...
  • Page 16 Disassembly guide 8. RF cable disassembly remove the sub PCBA from the ，as the fig.11 Sub PCBA RF cable Main FPC Fig.11...
  • Page 17 Disassembly guide 9. Sub PCBA disassembly Remove the RF cable and main FPC ，as the fig.12； RF cable CON. vibrator MIC CON. Main FPC CON. Fig.12...
  • Page 18 Disassembly guide 10.MIC、Main FPC& vibrator disassembly Remove the vibrator,MIC& ，as the fig.13； vibrator Fig.13...

  • Page 19: Structure Parts Diagram

    Structure parts diagram Back cover 3in1 module Battery （LCD, TP & front cover cover）...
  • Page 20 Structure parts diagram Volume key Power key cable Main PCBA Main FPC receiver Light Sensor 5M camera sensor holder sub PCBA Power key 0.3M Volume key camera...
  • Page 21 Repairing guide 1. LCD a. Check if the SW is correct, otherwise to upgrade the SW; b. Check the LCD if is ok, otherwise change a new LCD; c. If that the LCD loose, re-assemble the LCD and test; d. Checking the LCD connector if is ok, otherwise re-solder it or change a new one; e.

  • Page 22: Repairing Guide

    Repairing guide 2. Camera a. Checking the camera is assemble ok, re-assemble the camera and test; b. Using the good camera to do cross test, it can check if the camera is ok; c. Checking the camera connector if is ok as below picture, otherwise to re-solder or change a new one;...
  • Page 23 Repairing guide 3. TP a. Checking the SW and upgrade the SW; b. Checking the FPC of TP and re-assemble it; c. Using the good TP to do cross test; d. Checking the TP connector, otherwise re-solder or change a new one; e.
  • Page 24 Repairing guide 4.Ring a. Checking the shrapnel of speaker if is ok; b. Checking the resistance of speaker if is ok, otherwise to change a new one; c. Checking the FPC if is ok; d. Checking SPK-FPC if connector with sub-board is ok. Speaker CON.
  • Page 25 Repairing guide 5.receiver a. Checking the shrapnel of receiver if is ok; b. Checking the resistance of receiver if is ok, otherwise to change a new one; c. Checking the connector point on the main board if is ok, as below picture;...
  • Page 26 Repairing guide 6.MIC and Vibrator a. Checking the MIC and Vibrator is cold soldering, re-solder it; b. Change the MIC and Vibrator; c. Checking the circuit of MIC and Vibrator; d. Checking the FPC if connect ok. MIC CON. Vibrator...
  • Page 27 Repairing guide 7. Earphone a. Checking the shrapnel of earphone if is ok; b. Checking the connector point on the main board if is ok, as below picture; c. Change earphone connector; c. Checking the circuit of earphone. earphone...
  • Page 28 Repairing guide 8.No Power On a. Checking the voltage of battery if is 3.8-4.2V and connect ok; b. Upgrade the SW; b. Checking the power on key and circuit around it.;...
  • Page 29 Repairing guide 9.No charging a. Checking the voltage of battery if is over 3.4V; b. Checking the charger and USB cable if is ok; c. Checking the USB connector and circuit if is ok. USB Connector...
  • Page 30 Repairing guide 10.No SIM card and No memory card a. Checking the connector of T –card and SIM card; Change the connector of T –card and SIM card; SIM Connector 1 T-card connector Connector 2...
  • Page 31 Repairing guide 11.Signal a. Checking RF line if that is broken; b. Checking RF line assemble if is ok; Sub-board RF connector RF connector...