LG GX500 - Page 78

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4. TROUBLE SHOOTING
GX500 Operational Description Revision A
LG Electronics 79/143 LGE Property
STAR
T
18pin IO(CN401)
Is soldered ?
Source pin
of U401 = 4.8V ?
Output pin
of U310 =4.2V?
Resolder the CN301
Battery voltage is
over 3.4V?
Charge is operating properly
T
he TA can be
broken
Change other TA
then retest
Check solder
U310 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(CN301)
U310
TP1: Source pin
U310
TP2: Output pin
Figure 4-7. IO Connector
Figure 4-8. USB SWITCH
GX500 Operational Description Revision A
LG Electronics 79/143 LGE Property
STAR
T
18pin IO(CN401)
Is soldered ?
Source pin
of U401 = 4.8V ?
Output pin
of U310 =4.2V?
Resolder the CN301
Battery voltage is
over 3.4V?
Charge is operating properly
T
he TA can be
broken
Change other TA
then retest
Check solder
U310 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(CN301)
U310
TP1: Source pin
U310
TP2: Output pin
Figure 4-7. IO Connector
Figure 4-8. USB SWITCH