Micromax A290 User manual

A290 L2 Service Manual
1. Technical Specifications
Particular
Remarks
Key Matrix For Flashing
NA
Chipset
MT6592M
Android Version
Android 4.4.2
Frequency
1.4GHz
Network Mode
900MHz/1800MHz/1900MHz/850MHz
WCDMA 900MHZ/2100 MHz
ROM
8G
RAM
1G
Internal SD Card memory
5.64G (share with data memory)
Expandable Memory
32G
Factory mode code
Press vol+/ Vol-/ power key at the same time
Good Earpiece volume
32Ω± 15%
Good Loudspeaker volume
8Ω± 5%
Good Mic volume
2.2kΩ± 5%
Good Vibrator volume
30Ω± 5%

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
Camera
connector
Vibrator
connector
LCD
connector
Earphone
Connector
SPK
Battery
connector
TP
connector
RF coaxial
line
Main FPC
Battery

A290 L2 Service Manual
1. Does not power on
S.NO
Possible Cause
Validation steps
Action
1
NO power on
Power on key is fail
Change keys
2
Battery capacity level is
too low
Battery capacity
Charging the tablet
Sw issue
Flash the handset with latest SW
PCBA faulty
Replace PCBA / Refer L3 Repair

A290 L2 Service Manual
2. Display issue/No display
S.NO
Possible Cause
Validation steps
Action
1
No display
Sw issue
Flash the handset with latest SW
LCD fail
Change LCD
PCBA fail
Change PCBA
2
Colored screen
LCD fail
Change LCD
3
Dark screen
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
Possible Cause
Validation steps
Action
1
TP not working
SW Issue
Flash the handset with latest SW
TP issue
Charge TP
TP connection issue
Assemble TP again
PCBA issue
Refer to L3 repair
2
TP not working proper
TP issue
Charge TP
PCBA issue
Refer to L3 repair

A290 L2 Service Manual
4. Proximity Sensor
S.NO
Possible Cause
Validation steps
Action
1
Proximity sensor fail
SW Issue
Flash the handset with latest SW
Sensor holder is not
assembled well
Re-assemble the sensor holder
PCBA issue
Change PCBA
Sensor

A290 L2 Service Manual
5. G-sensor
S.NO
Possible Cause
Validation steps
Action
1
G-sensor is not working
SW Issue
Flash the handset with latest SW
Set problem
Reset mobile
PCBA issue
Change PCBA
6. Keys
S.NO
Possible Cause
Validation steps
Action
1
Key is not response
Key is fail
Change Keys FPC
2
The feeling of pressing
key is bad
Key is fail
Change Keys FPC
Key is not assembled well
Re-assemble

A290 L2 Service Manual
7. Charging
S.NO
Possible Cause
Validation steps
Action
1
Cannot charge into
Adapter is fail
Change adapter
2
Have charging icon, but
not charged
SW Issue
Flash the handset with latest SW
PCBA fail
Change PCBA
Battery fail
Change battery
Battery connector issue
Change battery connector
Battery
connector

A290 L2 Service Manual
8. USB
S.NO
Possible Cause
Validation steps
Action
1
Cannot connect to PC
USB cable is fail
Change USB cable
Main FPC fail
Change Main FPC having I/O connector
PCBA fail
Change PCBA
I/O
connector

A290 L2 Service Manual
9. 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
2
Cannot turn on front
camera
Sw issue
Flash the handset with latest SW
Camera fail
Change camera
PCBA fail
Change PCBA
10. Rear Camera
S.NO
Possible Cause
Validation steps
Action
1
Colored screen when
open front camera
Camera is fail
Change camera
PCBA fail
Change PCBA
2
Cannot turn on front
camera
Sw issue
Flash the handset with latest SW
Camera fail
Change camera
PCBA fail
Change PCBA

A290 L2 Service Manual
11. Playing Video
S.NO
Possible Cause
Validation steps
Action
1
Hang often
Sw issue
Flash the handset with latest SW
CPU poor soldering
Refer L3 Repair
DDR poor soldering
Refer L3 Repair
CPU
DDR

A290 L2 Service Manual
12. Vibrator
S.NO
Possible Cause
Validation steps
Action
1
Vibrating is not properly
Vibrate assemble issue
Re assemble
Vibrate issue
Change it
2
NO vibrate
Soldering issue
Re soldering it
Vibrate issue
Change it
PCBA issue
Refer to L3 service
3
Vibrate weakly
Vibrate issue
Change it
13. WiFi
S.NO
Possible Cause
Validation steps
Action
1
WI-FI not working
Set wifi turn off as default
Reset wifi to turn on wifi
4 in 1 chip fail
Change PCBA
WIFI chip
Vibrator Pads
Wifi
antenna

A290 L2 Service Manual
14. RF Network
S.NO
Possible Cause
Validation steps
Action
1
RF Network cannot
searchable
RF antenna is fail
Change RF antenna
SIM socket is fail
Change SIM socket
PCBA fail
Change PCBA
15. Bluetooth / FM
S.NO
Possible Cause
Validation steps
Action
1
Cannot turn on BT / FM
Sw issue
Flash the handset with latest SW
PCBA fail
Change PCBA
BT antenna fail
Change antenna
4 in 1 chip issue
Change 4 in 1 chip
RF PA
4 in 1 chip
Antenna
SIM
connector
Antenna

A290 L2 Service Manual
16. Receiver
S.NO
Possible Cause
Validation steps
Action
1
Noise/crack
Dust with receiver
Clean it
Receiver issue
Change it
2
Noise/volume low
Connection issue
Assemble it
Receiver issue
Change it
17. Earphone
S.NO
Possible Cause
Validation steps
Action
1
Not working / from
earphone
Earphone not detecting
Change earphone connector
Earphone connector
having poor soldering
Change earphone connector
Earphone
connector

A290 L2 Service Manual
18. MIC
S.NO
Possible Cause
Validation steps
Action
1
Noise with uplink side
Some dust with mic
Clean it
MIC issue
Change Main FPC
PCBA issue
Refer to L3 repair
2
Volume low
soldering issue
Change Main FPC
PCBA issue
Refer to L3 repair
3
No recording
MIC issue
Change Main FPC
SW issue
Re-install SW
PCBA issue
Refer to L3 repair
MIC

A290 L2 Service Manual
19. Speaker
S.NO
Possible Cause
Validation steps
Action
1
Noise/crack
Speaker with dust
Change speaker
Speaker foam issue
Change speaker
Speaker issue
Change speaker
2
No volume
Assemble issue
Assemble again
Speaker issue
Change it
Audio PA issue
Refer to L3 repair
3
Low volume
Assemble issue
Assemble again
Speaker issue
Change it
Audio PA issue
Refer to L3 repair
20. GPS
S.NO
Possible Cause
Validation steps
Action
1
GPS not connecting
Sw issue
Flash the handset with latest SW
GPS antenna issue
Change GPS antenna
4 in chip issue
Change PCBA
4 in 1 chip
Antenna

A290 L2 Service Manual
21. Battery
S.NO
Possible Cause
Validation steps
Action
1
Show charging but it is
not charged
Battery issue
Change battery
Charging connector issue
Change PCBA
2
No charging
Charging IC issue
Change PCBA
3
Cannot charge fully
Battery issue
Change battery
Charging IC issue
Change PCBA
battery connector issue
Change battery connector
Thanks
For any Query or suggestion, Please write to [e-mail]
Battery
connector