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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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CHECKING FLOW
START
Check Battery Voltage
> 3.35V
Push power-on key
And check the level change
of PWON
Check the voltage of
The LDO outputs at U101
Charge or Change Battery
Check the contact of power key
Or dome-switch
Replace U101
V_EXTL=1.8V, V_EXTH=2.8V, V_MMC=2.8V
V_SIM= 1.8 or 3V, V_USB=3.3V, V_RTC=1.8V
V_IO=1.8V, V_ABB=2.8V, V_MEM=1.8V ,
V_PLL= 1.3V
Replace the main board
YES
YES
YES
NO
NO
NO