Micromax Q301 User manual

Q301 L2 Service Manual

Q301 L2 Service Manual
1：Technical Specifications
Particular
Remarks
Chipset
SC7731C
Android Version
N/A
Frequency
GSM 850/900/1800/1900 WCDMA900/2100
Rom
4GB
RAM
512MB
Factory mode code
*#629#

Q301 L2 Service Manual

Q301 L2 Service Manual
2、service Details
1. Does not power on
S.NO
Possible Cause
Validation steps
Action
1
Shorting
Check shorting with Multi meter
Replace PCB if found
faulty
2
Battery
Check voltage with Multi meter Value must
be 3.7V DC or above
Replace if found faulty
3
Battery
Connector
Check battery connector
Re-solder/Replace if
found faulty
4
SW failure
Flashing with latest software
Flashing
5
Power on Key
Key failure
Re-solder/Replace if
found faulty
6
PCB
Suspected PCB faulty
Refer L3 repair

Q301 L2 Service Manual
2：Display issue/No display
S.NO
Possible Cause
Validation steps
Action
1
No display
SWissue
Flash the handset with latest SW
LCD issue
Re-assembly LCD/Replace it
PCBA issue
Re-assembly PCBA/Replace it
PCBA issue
Re-Solder the LCD connector or change it
2
Dark screen
LCD issue
Re-assembly LCD/Replace it
SWissue
Flash the handset with latest SW

Q301 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
Re-assembly TP/Replace it
PCBA issue
Refer to L3 repair
PCBA issue
Re-Solder the TP connector or change it
2
TP not working proper
TP issue
Re-assembly TP/Replace it
PCBA issue
Refer to L3 repair
4：Keys
S.NO
Possible Cause
Validation steps
Action
1
Key is not response
Key is fail
Change Key
SW Issue
Flash the handset with latest SW
2
The feeling of pressing
key is bad
Key soldering Quality
Solder Key again
Some dust with dome
Clean it
Key is not assembled well
Re-assemble

Q301 L2 Service Manual
5：Charging
S.NO
Possible Cause
Validation steps
Action
1
Cannot charge into
Adapter is fail
Change adapter
Cable is fail
Change Cable
Battery is issue
Charging or Change it
Main FPC issue
Re-assembly or Change it
I/O connector is fail
Re-Solder or Change it
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

Q301 L2 Service Manual
6：USB
S.NO
Possible Cause
Validation steps
Action
1
Cannot connect to PC
USB cable is fail
Change USB cable
I/O connector fail
Re-Solder or Change it
Main FPC issue
Re-assembly or Change it
PCBA fail
Change PCBA

Q301 L2 Service Manual
7：Camera
S.NO
Possible Cause
Validation steps
Action
1
Colored screen when
open front camera
Camera is fail
Re-assembly or Change it
PCBA fail
Change PCBA
2
Cannot turn on Rear
camera
SW issue
Flash the handset with latest SW
Camera fail
Re-assembly or Change it
Camera issue
Re-Solder or Change Camera connector
PCBA fail
Change PCBA

Q301 L2 Service Manual
8：Playing Video
S.NO
Possible Cause
Validation steps
Action
1
Hang often
SW issue
Flash the handset with latest SW
Flash poor soldering
Refer L3 Repair
CPU poor soldering
Refer L3 Repair
9：Vibrator
S.NO
Possible Cause
Validation steps
Action
1
Vibrating is not properly
Vibrate assemble issue
Re assemble it
SW issue
Flash the handset with latest SW
2
NO vibrate
Soldering issue
Re soldering it
PCBA issue
Refer to L3 service
3
Vibrate weakly
Vibrate issue
Change it