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