LG KG800 - Page 69

4. TROUBLESHOOTING
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START
Check Battery Voltage
> 3.35V ?
Push power-on key
And check the level change
of PWRKEY
Check the voltage of
The LDO outputs at U100
Logic level at KEYON(POWER KEY)
of U101= HIGH
Does it work properly?
THE PHONE WILL
POWER ON.
Charge or Change Battery
Check the contact of power key
Or dome-switch
Replace U100
VCORE=1.8V VVCXO=2.75V
VMEM=2.8V VRTC=1.8V
VEXT=2.8V VSIM=2.85V (when sim card is inserted)
VABB=2.75V VMIC=2.5V
Re-download software
The power-on procedure is
Completed. The problem may
be elsewhere.
Does it work properly?
Replace the main board
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
Checking Flow