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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
START
Check Battery Voltage
> 3.33V
Push power-on key
And check the level change
into low of POWERKEY
Check the voltage of
The LDO outputs at U102
Logic level at RPWRON of
TP10
= 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
Re-download software
1V8_VCORE=1.8V /TP1 2V75_VVCXO=2.75V /TP8
2V8_VMEM=2.8V / TP9 2V85_VSIM= 2.85V /TP4
2V8_VEXT=2.8V /TP3 1V8_VRTC=1.8V / TP2
2V5_VMIC=2.5V /TP7
Replace U103
Does it work properly?
Replace the main board
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
CHECKING FLOW
Replace U100 and Re-download software
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