Q4202 L2 Service Manual
Main FPC fail
Change main FPC
Sub PCBA issue
Change sub PCBA
Main PCBA fail
Change main PCBA/Refer to L3 repair
Inspect the touching point. If it is broken or deformed, change a new one.
19
：
Sim Related Issues
NO.
Description
Reason
Solution
1
Sim Related Issues
Software issue
Update Software
SIM card pin Virtual welding With the soldering iron repair welding pin
SIM card fail
Change SIM card
PCBA fail
Change PCBA/Refer to L3 repair
21
：
Memory Card Related Issues
NO.
Description
Reason
Solution
1
T card Related
Issues
Software issue
Update Software
T card pin Virtual welding
With the soldering iron repair welding pin
TF card fail
Change TF card
Speaker connect
