LG C3400 Service Manual page 67

4. Troubleshooting
Checking Flow
START
I/O Connector(CN300)
Is well-soldered ?
YES
Voltage at anode of
D102 = 5.2V ?
YES
Q100,D102,R106 are
well-soldered?
YES
Voltage across R106 is
about 10~100mV?
YES
0.7V < voltage(R108) < 1.3V?
YES
Battery is charged?
YES
Charging is
properly operating
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Resolder the CN300
NO
Pin 4,5 : VCHARGE
Pin12,19 : GND
NO
The TA is out of order
Change the TA
NO
Resolder the
Q100, D102, R106
NO
Replace the
Q100, D102
NO
Replace the
Q100
The battery may have
NO
problems.
Change the battery.