LG KE590 Service Manual page 66

I/O Connector (CN301,Main)
Check the FB301,FB302(Main),
Voltage at pin 5 of U102(Main)
Is LOW in case charging ?
Charging is operating properly
FB301
FB302
Pin 13,14
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Only for training and service purposes
START
Is well-soldered?
YES
Is it OK?
YES
YES
Battery is OK?
YES
U102
4. TROUBLE SHOOTING
Re-solder the CN301
NO
Re-solder the FB301, FB302(Main)
NO
The IC is out of order.
Replace the IC
NO
The Battery may have Problem.
Change Battery
NO
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(Pin 12,13)
LGE Internal Use Only