Charging Trouble - LG GW520 Service Manual

5.3 Charging Trouble

Checking Flow Checking Flow
Start Start
Change the battery. Change the battery.
If voltage level of battery is If voltage level of battery is
under 3.35V under 3.35V
then wait by above 3.35V then wait by above 3.35V
Is voltage 5.1V at C331? Is voltage 5.1V at C331?
(TP1) (TP1)
Is voltage 4.8V at C332? Is voltage 4.8V at C332?
(TP2) (TP2)
Is voltage at the VBAT 4.2V? Is voltage at the VBAT 4.2V?
Is _CHG_EN pulsing Is _CHG_EN pulsing
when connect the TA? when connect the TA?
_CHG_EOC pin(TP3) _CHG_EOC pin(TP3)
is low when connect the TA? is low when connect the TA?
Does Charging work well? Does Charging work well?
END END
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
NO NO
YES YES
NO NO
YES YES
NO NO
YES YES
NO NO
YES YES
NO NO
YES YES
NO NO
YES YES
GW520 service manual
1. Check soldering or change FL300 1. Check soldering or change FL300
2. Change TA 2. Change TA
Change U302 Change U302
Change U102 Change U102
Change U302 Change U302
Change the main board Change the main board
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5. Trouble shooting
LGE Internal Use Only