Micromax A76 User manual

A76 service manual

2
content
1、Product introduce..………..p3-p4
2、Disassembly guide ……….p5-p17
3、Structure parts diagram…..p18
4、Repairing guide …………...p19-p29

3
Product introduce

4
Product introduce
Model ：MA76
Product size：146 * 75.3 *10.4
Platform：MTK6572，dual-core 1.2GHz
Memory：4GB+4Gb (Nand&sdram+RAM）
System：Android 4.2
Frequency band: WCDMA：2100，GSM：900/1800MHz
Battery：2000mAh
charger: Travel charger
USB cable: MICRO 5PIN
earphone：3.5jack
LCD&TP：5.0 FWVGA, Capacitance TP，multi-point touch
Camera：0.3M and 5.0M CMOS
Support：BT2.1，WIFI，FM，NTC。
Support：3D graphics accelerator，accelerator sensor, distance sensor, light
feeling sensor。

5
Hot gun
Tweezer
Solder iron
Tommy bar
Cross Screw driver
1. Tools list
Tweezer /Cross screw driver/ Solder/Tommy bar/hot gun
Disassembly guide

6
2. Battery caver disassembly
open the battery cover，as the Fig. 1
Fig. 1
Disassembly guide
Battery
cover

7
3. Back caver disassembly
1）Unscrew 12 screws in back cover ，as the Fig.2；
Fig. 2
Disassembly guide

8
Fig. 3
2）Disassemble back cover with Tommy bar ，as the Fig.3；
Disassembly guide
Back
cover SPK

9
4.Main board and front cover disassembly
1）The main components of distribution，as the fig.4；
Fig.4
Disassembly guide
LCD con.Main PCBA
1.2M
CAM con.
8M CAM.
USB con.
Earphoe
con.
TP con. T card
con. SIM con.
Battery con.
Main FPC
vibrator
Sub PCBA
RF cable

2）remove two screws and open the LCD con.& TP con. ，and remove the
volume key FPC & power key FPC as the fig.5；
10
Fig.5
Disassembly guide
LCDcon.
TPcon.

3）open the main board and remove the RF cable con. And main FPC
con..as the FIG.6
11
Fig.6
Disassembly guide
Main FPC con.RF cable con.
Main board

remove the light sensor and 0.3M camera，as the fig.7；
12
5. 0.3M and 5M camera & light sensor disassembly
Fig.7
Disassembly guide
5M cam.
0.3M cam.
Light sensor&holder
Light sensor con.

13
Fig.8
6.Power key FPC & volume key FPC disassembly
remove the power key FPC and volume key FPC with the iron，as the fig.8；
Disassembly guide
Power key
FPC
Volume key
FPC

14
Fig.9
remove the Speaker camera and receiver，as the FIG.9；
7. Speaker & receiver disassembly
Disassembly guide
receiver

15
Fig.10
8. RF cable and Main FPC disassembly
Remove the RF cable and Main FPC ，as the fig.10
Disassembly guide
RF cable
Main FPC

16
Fig.11
9. Sub PCBA disassembly
remove the sub PCBA from the ，as the fig.11；
Disassembly guide
Sub PCBA
vibrator

17
Fig.12
10.MIC disassembly
Remove the MIC，as the fig.12；
Disassembly guide
MIC con.

18
Structure parts diagram
Battery
cover
Back
cover
3in1 module
(LCD, TP & front cover
RF cable
SPK
5M camera
0.3M camera
sub PCBA
Main
PCBA Light
sensor
Sensor
holder
receiver
Main FPC

19
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. Checking the circuit around the LCD connector.
LCD
connector

20
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;
d. Checking the circuit around the camera connector.
Repairing guide
Back Camera
connector Front Camera
connector