Page 1
1
A91
L1 & L2 service manual
Page 2
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
3
Product introduce
Page 4
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
charger: Travel charger
USB cable: MICRO 5PIN
earphone： 3.5jack
LCD&TP： 4.5FWVGA,TN, resolution:480*854，Capacitance TP multi-point
touch（2 point）
Camera：0.3M and 5.0M CMOS
Support：GPS， BT3.0，WIFI，FM。
Support：accelerator sensor, distance sensor, light feeling sensor。
Page 5
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
Page 6
6
2. Battery caver disassembly
open the battery cover
，
as the Fig. 1
Fig. 1
Disassembly guide
Battery
cover
Page 7
7
3. Back caver disassembly
1） Unscrew 10 screws in back cover ，as the Fig.2；
Fig. 2
Disassembly guide
Page 8
8
Fig. 3
2） Disassemble back cover with Tommy bar ，as the Fig.3；
Disassembly guide
Back
cover
SPK
Page 9
9
4.Main board and front cover disassembly
1）The main components of distribution，as the fig.4；
Fig.4
Disassembly guide
Sub PCBA RF cable
SIM con.
LCD con.
TP con.
Earphone
con.
USB con.
5.0M
CAM.
Main
PCBA
T card
con.
Battery con.
Main FPC
vibrator
Page 10
2）remove two screws and open the volume key FPC & LCD con.& TP con. ，
as the fig.5；
10
Fig.5
Disassembly guide
LCDcon.
TPcon.
Volume key
FPC
Page 11
3）remove the power key FPC and RF cable con. and 5M camera, as
the FIG. 6
11
Fig.6
Disassembly guide
Power key
FPC
RF cable con.
5M camera
Page 12
4）open the main board And main FPC con..as the FIG.7
12
Fig.7
Disassembly guide
Main FPC con.
Main board
Page 13
remove the light sensor and 0.3M camera，as the fig.8；
13
5. 0.3M camera & light sensor disassembly
Fig.8
Disassembly guide
Light sensor con.
Light sensor&holder
Sensor holder
Light sensor
0.3M cam.
0.3M cam. CON.
Page 14
14
Fig.9
6.Power key FPC & volume key FPC disassembly
remove the power key FPC and volume key FPC with the iron，as the fig.9；
Disassembly guide
Power key
FPC
Volume key
FPC
Page 15
15
Fig.10
remove the receiver and speaker，as the FIG.10；
7. 5M camera &receiver disassembly
Disassembly guide
receiver
speaker
Page 16
16
Fig.11
8. RF cable disassembly
remove the sub PCBA from the ，as the fig.11
Disassembly guide
RF cable
Main FPC
Sub PCBA
Page 17
17
Fig.12
9. Sub PCBA disassembly
Remove the RF cable and main FPC ，as the fig.12；
Disassembly guide
vibrator
Main FPC CON.
RF cable CON.
MIC CON.
Page 18
18
Fig.13
10.MIC、Main FPC& vibrator disassembly
Remove the vibrator,MIC& ，as the fig.13；
Disassembly guide
MIC
vibrator
Page 19
19
Structure parts diagram
Back
cover
Battery
cover
3in1 module
（LCD, TP & front
cover）
Page 20
20
Structure parts diagram
Main
PCBA
5M camera
receiver
SPK
Light
sensor
FPC
RF
cable
Sensor
holder
Main FPC
0.3M
camera
sub PCBA
MIC
Volume key
FPC
Power key
FPC
Volume key
Power key
Page 21
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. Checking the circuit around the LCD connector.
LCD
connector
Page 22
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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
Page 23
23
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. Checking the circuit around the TP connector.
Repairing guide
TP Connector
Page 24
24
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.
Repairing guide
Main FPC CON.
Speaker CON.
Page 25
25
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;
c. Checking the receiver circuit if is ok.
Repairing guide
Receiver CON.
Page 26
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.
26
6.MIC and Vibrator
Repairing guide
MIC CON.
Vibrator
Page 27
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.
27
7. Earphone
Repairing guide
earphone
Page 28
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.;
28
8.No Power On
Repairing guide
Page 29
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.
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9.No charging
Repairing guide
USB Connector
Page 30
a. Checking the connector of T –card and SIM card;
b. Change the connector of T –card and SIM card;
30
10.No SIM card and No memory card
Repairing guide
SIM Connector 1
SIM
Connector 2
T-card
connector
Page 31
a. Checking RF line if that is broken;
b. Checking RF line assemble if is ok;
31
11.Signal
Repairing guide
RF connector
Sub-board RF
connector
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