Service manual

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49

5. Backlight can’t be turned on

U105 FAIL

Black screen

Check pin4 of

CN101

Check CCFL-

Enable(pin 85)

of U105

Check crystal (pin 96,97)

waveform of U105

Check reset (pin84) of

U105

Check power supply

for U105

Check power

supply:pin 1,2 of

CN101

Check R167,Q106,

R108,R110

Inverter Fail

Check

X101,C153,C154

Check C144,R172

Check FB102,FB103,

FB105,FB106

Power fail

NG

NG

NG

NG

NG

NG

YES

YES

YES

YES

YESYES

VX1935wm-3