Service manual

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