Only For Training And Service Purposes - LG KP175 Service Manual

CHECKING FLOW
Check Battery Voltage
And check the level change
into low of PWRKEY
Check the voltage of
The LDO outputs at U102
Logic level at RPWRONN of U102
Is the phone power on?
Properly operating.
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

START
> 3.35V
YES
Push power-on key
YES
VCORE=1.8V
VMEM=2.8V
VEXT=2.8V
YES
= HIGH(above 1.2V)
YES
YES
The phone will
4. TROUBLE SHOOTING
NO
Charge or Change Battery
NO
Check the contact of power key
Or dome-switch
NO
Re-download software
VVCXO=2.75V
VSIM=1.8V or 2.85V
VMIC=2.5V
NO
Replace U102
NO
Replace U100 and Re-download software
Does it work properly?
Replace the main board
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NO
LGE Internal Use Only