LG GD310 Service Manual page 71

5. TROUBLE SHOOTING
START
5pin IO(CN300)
Is soldered ?
Yes
Source pin
of U300 =
4.8V ?
Yes
Output pin
of U300 =4.2V?
Yes
Battery voltage
is over 3.4V?
Yes
Battery thermistor
value
is about 10K?
Yes
Charge is operating
LGE Internal Use Only
No
Resolder the
CN300
The TA can be
No
broken
Change other TA
then retest
No
Check solder
U300 or replace it
No
Waiting until
battery
Voltage goes up
to 3.4V
No
Change the
Battery
retest
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Only for training and service purposes
5pin IO(CN300)
U300
TP1: Source pin
U300
TP2: Output pin