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LGE Internal Use Only
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
ʹΠΡΪΣΚΘΙΥ͑ι ͣͨ͑͡͡ͽ͑ͶΝΖΔΥΣΠΟΚΔΤ͑͟ͺΟΔ͑͑͟ͲΝΝ͑ΣΚΘΙΥ͑ΣΖΤΖΣΧΖΕ͑͟
ΟΝΪ͑ΗΠΣ͑ΥΣΒΚΟΚΟΘ͑ΒΟΕ͑ΤΖΣΧΚΔΖ͑ΡΦΣΡΠΤΖΤ
ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ
95/140
4. TROUBLE SHOOTING
CHECKING FLOW
CIRCUIT
TP1
TP2
START
VBAT = high ?
NO
Check U102
TP1, TP2 = Low ?
NO
YES
KEYPAD_LED = Low ?
Backlight will
work properly.
YES
Replace or resolder
TP1 or TP2 or LED
YES
NO
Check U102
2
1
EDLH0013401
LD400
A
C
4.7
R408
DNI
VA405
DNI
VA404
VBAT
LD401
EDLH0013401
2
1
A
C
R407
4.7
KEYPAD_LED
TP1
TP2