ViewSonic VS11444 Service Manual page 53

6.6. Black Screen and backlight turn on
Black Screen
Check Power Supply:
Pin 1, 2 of CN101
Check Power:
Pin 2 of U101 and Pin 2
Check Reset Waveform
(Pin 84 of U105)
Check Crystal Waveform
(Pin 96,97 of U105)
(TSUM16AL) Fail
ViewSonic Corporation
OK
of U102
OK
OK
OK
U105
NG
NG
NG
NG
Confidential - Do Not Copy
50
Power Fail
U101, U102 Fail
Check C144 and
R172
Check X101,
C153, C154
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