ViewSonic VS11444 Service Manual page 52

6.5. Backlight can't be turned on
Black screen
Check power
supply:pin 1,2 of
CN101
YES
Check power supply
for U105
YES
Check reset (pin84) of
U105
YES
Check crystal (pin 96,97)
waveform of U105
YES
Check CCFL-
Enable(pin 85)
of U105
NG
U105 FAIL
ViewSonic Corporation
NG
NG
NG
NG
YES
Check pin4 of
CN101
NG
49
YES
Confidential - Do Not Copy
Power fail
Check FB102,FB103,
FB105,FB106
Check C144,R172
Check
X101,C153,C154
Inverter Fail
Check R167,Q106,
R108,R110
VX1945wm-3