LG KP500 Service Manual page 73

5. Trouble shooting
START
18pin IO(CN401)
Is soldered ?
Source pin
of U401 = 5.1V ?
Output pin
of U401 =4.2V?
Battery voltage
is over 3.4V?
Battery thermistor
is about 68K?
Charge is operating
LGE Internal Use Only
No
Yes
No
Yes
No
Yes
No
Yes
No
value
Yes
Resolder the
CN401
The TA can be
broken
Change other TA
then retest
Check solder
U401 or replace it
Waiting until
battery
Voltage goes up
to 3.4V
Change the
Battery
After check
thermistor
U401
TP2: Output pin
Copyright © 2008 LG Electronics. Inc. All right reserved.
- 74 -
18pin IO
(CN401)
U401
TP1: Source pin
Only for training and service purposes