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CHECKING FLOW
Check Battery Voltage
Push power-on key
And check the level change
into low of PWRKEY
Check the voltage of
The LDO outputs at U104
Logic level at RPWRON of U104
=
HIGH(above 1.2V)
Is the phone power on?
The phone will
Properly operating.
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
START
> 3.35V
YES
NO
YES
NO
VCORE=1.8V
VMEM=2.8V
VEXT=2.8V
YES
VMIC=2.5V
NO
YES
NO
YES
- 47 -
4. TROUBLE SHOOTING
NO
Charge or Change Battery
Check the contact of power key
Or dome-switch
Re-download software
VVCXO=2.75V
VSIM=1.8V or 2.85V
VABB=2.75V
Replace U104
Replace U104 and Re-download software
Does it work properly?
Replace the main board
NO
LGE Internal Use Only
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