Only For Training And Service Purposes - LG GX500 Service Manual

GX500 Operational Description GX500 Operational Description
START START
18pin IO(CN401) 18pin IO(CN401)
Is soldered ? Is soldered ?
Yes
Source pin Source pin
of U401 = 4.8V ? of U401 = 4.8V ?
Yes
Output pin Output pin
of U310 =4.2V? of U310 =4.2V?
Yes Yes
Battery voltage is Battery voltage is
over 3.4V? over 3.4V?
Yes Yes
Battery thermistor Battery thermistor
value value
is about 10K? is about 10K?
Yes
Charge is operating properly Charge is operating properly
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Only for training and service purposes

No No
Resolder the CN301
Yes
No No
Yes
No No
No No
No No
Yes
79/143 79/143
Resolder the CN301
The TA can be The TA can be
broken broken
Change other TA Change other TA
then retest then retest
Check solder Check solder
U310 or replace it U310 or replace it
Waiting until Waiting until
battery battery
Voltage goes up to Voltage goes up to
3.4V 3.4V
Change the Battery Change the Battery
retest retest
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4. TROUBLE SHOOTING
Revision A Revision A
Figure 4-7. IO Connector Figure 4-7. IO Connector
TP1: Source pin
TP2: Output pin
Figure 4-8. USB SWITCH Figure 4-8. USB SWITCH
LGE Property LGE Property
LGE Internal Use Only
5pin IO(CN301) 5pin IO(CN301)
U310 U310
TP1: Source pin
U310 U310
TP2: Output pin