Download A290 L2 Service Manual

A290
L2 Service Manual
1. Technical Specifications
Particular
Remarks
Key Matrix For Flashing
Chipset
Android Version
Frequency
NA
MT6592M
Android 4.4.2
1.4GHz
900MHz/1800MHz/1900MHz/850MHz
WCDMA 900MHZ/2100 MHz
8G
1G
5.64G (share with data memory)
32G
Press vol+/ Vol-/ power key at the same time
32Ω ± 15%
8Ω ± 5%
2.2kΩ ± 5%
30Ω ± 5%
Network Mode
ROM
RAM
Internal SD Card memory
Expandable Memory
Factory mode code
Good Earpiece volume
Good Loudspeaker volume
Good Mic volume
Good Vibrator volume
A290
L2 Service Manual
2： CAUTIONS
I.
Flashing & Servicing must be undertaken by qualified personnel only.
II.
Ensure all work is carried out at an anti-static workstation and that an anti-static wrist strap is worn.
III.
Use only approved Tools & components as specified in the parts list.
IV.
Ensure all components, modules, screws, and insulators are correctly re-fitted after servicing and
alignment
V.
Ensure all cables and wires are repositioned correctly if Handset disassembled
VI. Electrostatic discharge can easily damage the sensitive components of electronic products.
Therefore, Service Centre must adhere the precautions which mentioned above.
3：Service Details
Main Components
Vibrator
connector
Battery
LCD
connector
Camera
connector
TP
connector
SPK
RF coaxial
line
Main FPC
Battery
connector
Earphone
Connector
A290
L2 Service Manual
1. Does not power on
S.NO
1
2
Possible Cause
NO power on
Battery capacity level is
too low
Validation steps
Power on key is fail
Action
Change keys
Battery capacity
Charging the tablet
Sw issue
PCBA faulty
Flash the handset with latest SW
Replace PCBA / Refer L3 Repair
A290
L2 Service Manual
2. Display issue/No display
S.NO
1
2
3
Possible Cause
No display
Colored screen
Dark screen
Validation steps
Action
Sw issue
Flash the handset with latest SW
LCD fail
Change LCD
PCBA fail
Change PCBA
LCD fail
Change LCD
LCD fail
Change LCD
Sw issue
Flash the handset with latest SW
LCD backlight circuit issue
Change PCBA
LCD backlight is set
too low by person
Reset the value of backlight
A290
L2 Service Manual
3. Touch panel
S.NO
1
2
Possible Cause
TP not working
TP not working proper
Validation steps
SW Issue
TP issue
TP connection issue
PCBA issue
TP issue
PCBA issue
Action
Flash the handset with latest SW
Charge TP
Assemble TP again
Refer to L3 repair
Charge TP
Refer to L3 repair
A290
L2 Service Manual
4. Proximity Sensor
S.NO
1
Possible Cause
Proximity sensor fail
Validation steps
SW Issue
Sensor holder is not
assembled well
PCBA issue
Sensor
Action
Flash the handset with latest SW
Re-assemble the sensor holder
Change PCBA
A290
L2 Service Manual
5. G-sensor
S.NO
1
Possible Cause
G-sensor is not working
Validation steps
SW Issue
Set problem
PCBA issue
Action
Flash the handset with latest SW
Reset mobile
Change PCBA
Validation steps
Key is fail
Key is fail
Key is not assembled well
Action
Change Keys FPC
Change Keys FPC
Re-assemble
6. Keys
S.NO
1
2
Possible Cause
Key is not response
The feeling of pressing
key is bad
A290
7.
L2 Service Manual
Charging
S.NO
1
2
Possible Cause
Cannot charge into
Have charging icon, but
not charged
Validation steps
Adapter is fail
Action
Change adapter
SW Issue
Flash the handset with latest SW
PCBA fail
Battery fail
Battery connector issue
Change PCBA
Change battery
Change battery connector
Battery
connector
A290
8.
L2 Service Manual
USB
S.NO
1
Possible Cause
Cannot connect to PC
Validation steps
USB cable is fail
Main FPC fail
PCBA fail
Action
Change USB cable
Change Main FPC having I/O connector
Change PCBA
I/O
connector
A290
9.
L2 Service Manual
Front Camera
S.NO
Possible Cause
Validation steps
Action
1
Colored screen when
open front camera
Camera is fail
Change camera
PCBA fail
Change PCBA
Sw issue
Flash the handset with latest SW
2
Cannot turn on front
camera
Camera fail
Change camera
PCBA fail
Change PCBA
Possible Cause
Validation steps
Action
1
Colored screen when
open front camera
Camera is fail
Change camera
PCBA fail
Change PCBA
Sw issue
Flash the handset with latest SW
2
Cannot turn on front
camera
Camera fail
Change camera
PCBA fail
Change PCBA
10. Rear Camera
S.NO
A290
L2 Service Manual
11. Playing Video
S.NO
1
Possible Cause
Hang often
Validation steps
Sw issue
CPU poor soldering
DDR poor soldering
Action
Flash the handset with latest SW
Refer L3 Repair
Refer L3 Repair
DDR
CPU
A290
L2 Service Manual
12. Vibrator
S.NO
Possible Cause
1
Vibrating is not properly
2
NO vibrate
3
Vibrate weakly
Validation steps
Vibrate assemble issue
Vibrate issue
Soldering issue
Vibrate issue
PCBA issue
Vibrate issue
Action
Re assemble
Change it
Re soldering it
Change it
Refer to L3 service
Change it
Vibrator Pads
13. WiFi
S.NO
1
Possible Cause
WI-FI not working
Wifi
antenna
Validation steps
Set wifi turn off as default
4 in 1 chip fail
Action
Reset wifi to turn on wifi
Change PCBA
WIFI chip
A290
L2 Service Manual
14. RF Network
S.NO
1
Possible Cause
RF Network cannot
searchable
Validation steps
RF antenna is fail
SIM socket is fail
PCBA fail
Action
Change RF antenna
Change SIM socket
Change PCBA
SIM
connector
Antenna
RF PA
15. Bluetooth / FM
S.NO
1
Possible Cause
Cannot turn on BT / FM
Validation steps
Sw issue
PCBA fail
BT antenna fail
4 in 1 chip issue
Action
Flash the handset with latest SW
Change PCBA
Change antenna
Change 4 in 1 chip
4 in 1 chip
Antenna
A290
L2 Service Manual
16. Receiver
S.NO
Possible Cause
1
Noise/crack
2
Noise/volume low
Validation steps
Dust with receiver
Receiver issue
Connection issue
Receiver issue
Action
Clean it
Change it
Assemble it
Change it
17. Earphone
S.NO
1
Possible Cause
Not working / from
earphone
Validation steps
Action
Earphone not detecting
Change earphone connector
Earphone connector
having poor soldering
Change earphone connector
Earphone
connector
A290
18.
L2 Service Manual
MIC
S.NO
Possible Cause
1
Noise with uplink side
2
Volume low
3
No recording
Validation steps
Some dust with mic
MIC issue
PCBA issue
soldering issue
PCBA issue
MIC issue
SW issue
PCBA issue
Action
Clean it
Change Main FPC
Refer to L3 repair
Change Main FPC
Refer to L3 repair
Change Main FPC
Re-install SW
Refer to L3 repair
MIC
A290
19.
Speaker
S.NO
20.
L2 Service Manual
Possible Cause
1
Noise/crack
2
No volume
3
Low volume
Validation steps
Speaker with dust
Speaker foam issue
Speaker issue
Assemble issue
Speaker issue
Audio PA issue
Assemble issue
Speaker issue
Audio PA issue
Action
Change speaker
Change speaker
Change speaker
Assemble again
Change it
Refer to L3 repair
Assemble again
Change it
Refer to L3 repair
Validation steps
Sw issue
GPS antenna issue
4 in chip issue
Action
Flash the handset with latest SW
Change GPS antenna
Change PCBA
GPS
S.NO
1
Possible Cause
GPS not connecting
4 in 1 chip
Antenna
A290
21.
L2 Service Manual
Battery
S.NO
Possible Cause
1
Show charging but it is
not charged
2
No charging
3
Cannot charge fully
Validation steps
Battery issue
Charging connector issue
Charging IC issue
Battery issue
Charging IC issue
battery connector issue
Action
Change battery
Change PCBA
Change PCBA
Change battery
Change PCBA
Change battery connector
Battery
connector
Thanks
For any Query or suggestion, Please write to [email protected]