LG U310 Service Manual page 118

Start
Check the pin and battery
Connect terminals of I/O connector
Connection OK?
Yes
Is the TA voltage 4.6V?
Is the USB voltage 5.0V?
Yes
Check the Q400,Q401,Q402
Yes
Charging OK?
NO
Change the board
4. TROUBLE SHOOTING
NO
Change I/O connector
NO
Change TA/USB cable
Yes
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END