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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
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 LD100 or LD101
or LD102 or LD103 is confirm
(TP2
)
NO
Change LD100 or LD101
Of LD102 or LD 103
YES
YES
YES
Keypad Backlight Works
Check V at R401(
TP3
)or
R410(
TP4
) is confirm
NO
Change Key FPCB
1
1
2
Keypad Backlight Works
Содержание GD580
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