LG GD510 Service Manual page 59

5. Trouble shooting
GD510 Operational Description
START
uUSB(CN401)
Is soldered?
Yes
Source pin
of U402 = 4.8V ?
Yes
Output pin
of U402 =4.2V?
Yes
Battery voltage
is over 3.4V?
Yes
Battery thermistor
value
is about 10K?
Yes
Charge is operating
LG Electronics
LGE Internal Use Only
No
Resolder the
CN401
The TA can be
broken
No
Change other TA
then retest
Check solder
No
U402 or replace it
Waiting until
No
battery
Voltage goes up
to 3.4V
No
Change the
Battery
retest
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uUSB IO(CN401)
U401
TP1: Source pin
U402
TP2: Output pin