Only For Training And Service Purposes - LG KP235 Service Manual

CHECKING FLOW
Check Battery Voltage
Push power-on key
And check the level change
into low of POWERKEY
Check the voltage of
The LDO outputs at U103
Logic level at RPWRON of U103
= HIGH(above 1.2V)
Is the phone power on?
The phone will
Properly operating.
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Only for training and service purposes

START
> 3.35V
YES
NO
YES
NO
1V8_VCORE=1.8V
2V8_VMEM=2.8V
2V8_VEXT=2.8V
YES
2V5_VMIC=2.5V
NO
YES
NO
YES
- 49 -
4. TROUBLE SHOOTING
NO
Charge or Change Battery
Check the contact of power key
Or dome-switch
Re-download software
VVCXO=2.75V
2V85_ VSIM= 2.85V
1V8_VRTC=1.8V
Replace U103
Replace U100 and Re-download software
Does it work properly?
Replace the main board
NO
LGE Internal Use Only