LG GS290 - Page 66

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4. TROUBLE SHOOTING
GS290 Operational Description Revision B
LG Electronics 68/136 LGE Property
STAR
T
5pin IO(CN200)
Is soldered ?
Source pin
of U201 = 4.8V ?
Output pin
of U201 =4.2V?
Resolder the CN200
Battery voltage is
over 3.4V?
Charge is operating properly
T
he TA can be
broken
Change other TA
then retest
Check solder
U201 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
5pin IO(CN200)
U401
TP2: Output pin
U401
TP1: Source pin