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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
4. TROUBLE SHOOTING
LGE Internal Use Only
START
Check Battery Voltage
> 3.35V
Push power-on key
And check the level change
into low of POWERKEY
(TP1)
Check the voltage of
The LDO outputs at U103
Logic level at RPWRON
(DBBON) of D106(TP2)
= HIGH(above 1.2V)?
Is the phone power on?
The phone will
Properly operating.
Charge or Change Battery
Check the contact of power key
Or dome-switch
Replace U103
VCORE=1.2V~1.5V 2V75_VCXO=2.75V
1V88_VMEM=1.88V 2V85_VSIM= 2.85V
2V93_VEXT=2.93V
1V5_VPLL=1.5V
2V5_VMIC=2.5V 2V5_VABB=2.5V
Re-download software
Does it work properly?
Replace the main board
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
CHECKING FLOW
Replace U103 and Re-download software