Trouble Shooting; Power On Trouble - LG KT520 Service Manual

4. TROUBLE SHOOTING

4. TROUBLE SHOOTING

4.1 Power ON Trouble

The voltage of main battery
END key operates well?
ONSWBn level is low
when END key pressed.
VRADA_2V8 (C601) 2.8V
VDDD_1V5 (C602) 1.5V
VDDE_1V8 (C603) 1.8V
VDDC_2V65(C606) 2.65V
VDDF_2V5 (C608) 2.5V
VDDG_2V75 (C609) 2.75V
VDDK_2V75(C610) 2.75V
LGE Internal Use Only
START
is higher than 3.2V ?
Yes
Yes
Check the voltage.
VCORE(C616) 1.5V
No
Change main board
- 84 -
No
change
main battery
Follow the
No
keypad Trouble
shooting guide
ONSWBn
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