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cromax A121 Service Manual
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cromax A121 Service Manual

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A121
L2 Service Manual
Product introduce
Model ：A121
Product size：146.2*74.2*10.2mm
Platform：MSM8212， 1.2GHz Quad
Memory： 4GB+1GB (Nand&sdram+RAM）
System： Android
Frequency band: WCDMA： 900+2100 ，GSM：850/900/1800/1900
Battery：2000mAh
Charger: Travel charger
USB cable: MICRO 5PIN
Earphone：3.5jack
LCD&TP：5.0HD IPS, resolution: 1280*720，Capacitance TP
Camera：2.0M and 8.0M CMOS
Support：GPS，BT4.0，WIFI，WAPI
Support：3D graphics accelerator，accelerator sensor, distance sensor, light
feeling sensor，Double MIC noise reduction

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Summary of Contents for cromax A121

  • Page 1 All manuals and user guides at all-guides.com A121 L2 Service Manual Product introduce Model ：A121 Product size：146.2*74.2*10.2mm Platform：MSM8212， 1.2GHz Quad Memory： 4GB+1GB (Nand&sdram+RAM） System： Android Frequency band: WCDMA： 900+2100 ，GSM：850/900/1800/1900 Battery：2000mAh Charger: Travel charger USB cable: MICRO 5PIN Earphone：3.5jack LCD&TP：5.0HD IPS, resolution: 1280*720，Capacitance TP Camera：2.0M and 8.0M CMOS...
  • Page 2 All manuals and user guides at all-guides.com A121 L2 Service Manual 1. Tools list  Tweezer  Cross screw driver  Solder  Tommy bar  Hot gun...
  • Page 3 All manuals and user guides at all-guides.com A121 L2 Service Manual 2. Battery cover disassembly  Open the battery cover，as the Fig. 1 3. Back caver disassembly  Unscrew 9 screws in back cover，as the Fig.2...
  • Page 4 All manuals and user guides at all-guides.com A121 L2 Service Manual  Disassemble back cover with Tommy bar，as the Fig.3...
  • Page 5 All manuals and user guides at all-guides.com A121 L2 Service Manual 4. Main board and front cover disassembly  The main components of distribution，as the fig.4...
  • Page 6 All manuals and user guides at all-guides.com A121 L2 Service Manual  Remove 3 screws and open the LCD con. & TP con， remove the volume key FPC & power key FPC, as the FIG. 5...
  • Page 7 All manuals and user guides at all-guides.com A121 L2 Service Manual  Open the main board and remove the RF cable con. And main FPC con..as the FIG.6...
  • Page 8 All manuals and user guides at all-guides.com A121 L2 Service Manual 5. Camera & light sensor disassembly  Remove the light sensor and Front camera and Back camera，as the fig.7...
  • Page 9 All manuals and user guides at all-guides.com A121 L2 Service Manual 6. Power key FPC & volume key FPC disassembly  Remove the power key FPC and volume key FPC with the iron，as the fig.8...
  • Page 10 All manuals and user guides at all-guides.com A121 L2 Service Manual 7. Sub PCBA disassembly  Remove the sub PCBA from the, as the fig.9...
  • Page 11 All manuals and user guides at all-guides.com A121 L2 Service Manual 8. Receiver, speaker, Main MIC and Back MIC Rubber disassembly, as the FIG.10...
  • Page 12 All manuals and user guides at all-guides.com A121 L2 Service Manual 9. RF cable, Main FPC and vibrator disassembly...
  • Page 13 All manuals and user guides at all-guides.com A121 L2 Service Manual 10. Structure parts diagram...
  • Page 14 All manuals and user guides at all-guides.com A121 L2 Service Manual 11. Structure parts diagram...

  • Page 15: Repairing Guide

    All manuals and user guides at all-guides.com A121 L2 Service Manual Repairing guide 1. LCD  Check if the SW is correct, otherwise to upgrade the SW;  Check the LCD if is ok, otherwise change a new LCD;  If that the LCD loose, re-assemble the LCD and test;...
  • Page 16 All manuals and user guides at all-guides.com A121 L2 Service Manual 2. Camera  Checking the camera is assemble ok, re-assemble the camera and test;  Using the good camera to do cross test, it can check if the camera is ok;...
  • Page 17 All manuals and user guides at all-guides.com A121 L2 Service Manual 3. Touch Pannel  Checking the SW and upgrade the SW;  Checking the FPC of TP and re-assemble it;  Using the good TP to do cross test;...
  • Page 18 All manuals and user guides at all-guides.com A121 L2 Service Manual 4. Ringer  Checking the shrapnel of speaker if is ok;  Checking the resistance of speaker if is ok, otherwise to change a new one;  Checking the FPC if is ok;...
  • Page 19 All manuals and user guides at all-guides.com A121 L2 Service Manual 5. Reciever  Checking the shrapnel of receiver if is ok;  Checking the resistance of receiver if is ok, otherwise to change a new one;  Checking the connector point on the main board if is ok, as below picture;...
  • Page 20 All manuals and user guides at all-guides.com A121 L2 Service Manual 6. MIC and Vibrator  Checking the MIC and Vibrator is cold soldering, re-solder it;  Change the MIC and Vibrator;  Checking the circuit of MIC and Vibrator;...
  • Page 21 All manuals and user guides at all-guides.com A121 L2 Service Manual 7. Earphone  Checking the shrapnel of earphone if is ok;  Checking the connector point on the main board if is ok, as below picture;  Change earphone connector;...
  • Page 22 All manuals and user guides at all-guides.com A121 L2 Service Manual 8. No Power On / Dead  Checking the voltage of battery if is 3.8-4.2V and connect ok;  Upgrade the SW;  Checking the power on key and circuit around it...
  • Page 23 All manuals and user guides at all-guides.com A121 L2 Service Manual 9. No charging  Checking the voltage of battery if is over 3.4V;  Checking the charger and USB cable if is ok;  Checking the USB connector and circuit if is ok.
  • Page 24 All manuals and user guides at all-guides.com A121 L2 Service Manual 10. No SIM card and No memory card  Checking the connector of T –card and SIM card;  Change the connector of T –card and SIM card;...
  • Page 25 All manuals and user guides at all-guides.com A121 L2 Service Manual 11. No Nervice / Network Drop  Checking RF line if that is broken;  Checking RF line assemble if is ok; Thanks For any query or suggestion please write to tech.help@micromaxinfo.com...