LG L1718S-BN Service Manual - Page 19
Black Screen and backlight turn
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UPC - 719192182073
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5.Black Screen and backlight turn on Black Screen Check power supply: NG Pin1, 2 of CN101 OK NG Check pin34, 51, 66, and 82 Of U105 OK NG Check pin32, 49, 56, and 75 Of U105 OK Check Reset (pin84) NG Of U105 OK Power Fail Check FB103 And U102 Check FB106 And U101 Check C144, R172 Check Crystal: Pin96, Pin97 Of U105 OK Check CCFL -Enable (pin85) of U105 NG MCU Fail NG Check: X101, C153, C154 OK Check pin5 of CN101 NG OK Inverter Fail Check R167, Q106 R108, R110 19
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Black Screen
Power Fail
Check power supply:
Pin1, 2 of CN101
Check pin34, 51, 66, and 82
Of U105
Check Crystal: Pin96,
Pin97
Of U105
Check CCFL
-
Enable
(pin85) of U105
MCU Fail
Check FB103
Check: X101,
C153, C154
Inverter Fail
OK
NG
OK
Check Reset (pin84)
Of U105
Check pin5 of
CN101
Check R167, Q106
R108, R110
Check C144, R172
NG
NG
OK
OK
Check pin32, 49, 56, and 75
Of U105
And U102
Check FB106
And U101
NG
NG
NG
OK
OK
OK
NG
5.Black Screen and backlight turn on
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