LG GD510 - Safety Guidelines: Usage, Health, and Battery

- 60 -
LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
5. Trouble shooting
GD510 Operational Description Revision A
LG Electronics 65/113 LGE Property
START
uUSB(CN401)
Is soldered?
Source pin
of U402 = 4.8V ?
Output pin
of U402 =4.2V?
Resolder the
CN401
Battery voltage
is over 3.4V?
Charge is operating
The TA can be
broken
Change other TA
then retest
Check solder
U402 or replace it
Waiting until
battery
Voltage goes up
to 3.4V
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Battery thermistor
value
is about 10K?
Change the
Battery
retest
No
U402
TP2: Output pin
uUSB IO(CN401)
U401
TP1: Source pin