Keypad Backlight Trouble - LG GD580 Service Manual

4. Trouble Shooting

4.8 Keypad Backlight Trouble

to turn on the power
Keypad Backlight Works?
1
Check V at LD100 or LD101
1
or LD102 or LD103 is confirm
Check V at R401(TP3)or
2
R410(TP4) is confirm
Keypad Backlight Works
LGE Internal Use Only
START
Press END Key
NO
VBAT applied? (TP1)
YES
(TP2)
YES
YES
YES
Keypad Backlight Works
NO
Change Main Board
NO
NO
Change Key FPCB
- 96 - Copyright © 2009 LG Electronics. Inc. All right reserved.
Change LD100 or LD101
Of LD102 or LD 103
Only for training and service purposes