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4. TROUBLE SHOOTING
CIRCUIT
KEYPAD_LED
CHECKING FLOW
START
VBAT = high ?
YES
TP1, TP2 = Low ?
YES
Backlight will
work properly.
LGE Internal Use Only
LD401
EDLH0013401
TP1
R407
VA404
DNI
TP1
4.7
NO
Check U102
NO
KEYPAD_LED = Low ?
YES
Replace or resolder
TP1 or TP2 or LED
4. TROUBLE SHOOTING
VBAT
LD400
EDLH0013401
TP2
R408
TP2
4.7
NO
Check U102
95/140
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Copyright © 2010 LG Electronics. Inc. All right reserved.
VA405
DNI
Only for training and service purposes
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