LG KP260 Service Manual page 55

4. TROUBLE SHOOTING
CHECKING FLOW
And check the level change
into low of POWERKEY
The LDO outputs at U102
Logic level at RPWRON of U102
LGE Internal Use Only
START
Check Battery Voltage
> 3.33V
YES
Push power-on key
YES
Check the voltage of
1V8_VCORE=1.8V /TP1
2V8_VMEM=2.8V / TP9
2V8_VEXT=2.8V /TP3
YES
2V5_VMIC=2.5V /TP7
TP10
= HIGH(above 1.2V)
YES
Is the phone power on?
YES
The phone will
Properly operating.
NO
Charge or Change Battery
NO
Check the contact of power key
Or dome-switch
NO
Re-download software
2V75_VVCXO=2.75V /TP8
2V85_VSIM= 2.85V /TP4
1V8_VRTC=1.8V / TP2
NO
Replace U102
NO
Replace U100 and Re-download software
Does it work properly?
Replace the main board
Copyright © 2008 LG Electronics. Inc. All right reserved.
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NO
Only for training and service purposes