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4. TROUBLE SHOOTING
CHECKING FLOW
START
Check Battery Voltage
> 3.30V
Push power-on key
And check the level change
into high of POWERKEY
Check the voltage of
The LDO outputs at U102
Logic level at RPWRON of R101
=
HIGH(above 1.2V)?
Is the phone power on?
The phone will
Properly operating.
LGE Internal Use Only
NO
YES
NO
YES
NO
VCORE_PMU = 1.2V, VTCXO = 2.8V. VRF = 2.8V, VA = 2.8V
VM = 2.8V,VIO = 2.8V, VCAMA = 2.8V, VUSB = 3.3V,
VSIM1 = 3.0V, VSIM2 = 3.0V
YES
NO
YES
NO
YES
4. TROUBLE SHOOTING
Charge or Change Battery
Check the contact of power key
Or dome-switch
Replace U102 (MT6253)
Re-download software
Replace U102 and
Re-download software
Does it work properly?
NO
Replace the main board
69/140
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Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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