LG KU950 Service Manual page 129

4. TROUBLE SHOOTING
Check the pin and battery
Connect terminals of I/O connector
Is the TA voltage 4.6V?
Is the USB voltage 5.0V?
Check the Q600,Q601,Q602
Start
Connection OK?
Yes
Yes
Yes
Charging OK?
NO
Change the board
NO
Change I/O connector
NO
Change TA/USB cable
Yes
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