LG GW520 - Charging Trouble

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