Keypad Backlight Trouble - LG KF750 Service Manual

4.9 Keypad Backlight Trouble

Press END Key
to turn on the power
Keypad Backlight Works?
1
2
Check V at R 101 or R 102 is confirm
Keypad Backlight Works?
3
Crack Mainkey PCB to main board
Change Mainkey PCB
Keypad Backlight Works
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
START
NO
VBAT applied?
YES
YES
No
YES
4. TROUBLE SHOOTING
YES
No
Change Main Board
No
Change LD101 or LD102
YES
No
Change Main Board
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LGE Internal Use Only