Only For Training And Service Purposes - LG GB220 Service Manual

4. TROUBLE SHOOTING
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 U101
Logic level at RPWRON of R126
= HIGH(above 1.2V)?
Is the phone power on?
The phone will
Properly operating.
LGE Internal Use Only
LGE Internal Use Only
START
NO
> 3.35V
YES
NO
YES
NO
VCORE=1.2V, VPMU=1.2V. VRTC=2.3V, VDD_1.8V=1.8V
VAUX=2.8V,VMMC=2.8V, VUSB=3.1V,
VDD_RF2=2.5V,VRF1=1.8V,VDDTRX=1.3V, VDDMS=1.3V
VDDXO=1.3V, VDDTDC=1.3V
YES
NO
YES
NO
YES
Charge or Change Battery
Check the contact of power key
Or dome-switch
Replace U101
Re-download software
Replace U101 and Re-download software
Does it work properly?
NO
Replace the main board
Copyright © 2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

- 76 - Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes