LG GT500 - Keypad Backlight Trouble

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Only for training and service purposes
4. TROUBLE SHOOTING
4.8 Keypad Backlight Trouble
START
Press END Key
to turn on the power
Keypad Backlight Works?
YES
NO
VBAT applied? (TP1)
Change Main Board
NO
Check V at LD1000 or LD1001
or LD1002 or LD1003 is confirm
(TP2)
NO
Change LD1000 or LD1001
Of LD1002 or LD 1003
YES
YES
YES
Keypad Backlight Works
Check V at R626(TP3)or
R627(TP4) is confirm
NO
Change Key FPCB
1
1
2
Keypad Backlight Works