Vizio VO420E Service Manual page 15

Chapter 9
MONITOR DISPLAY NOTHING (PC MODE)
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CONFIDENTIAL DO NOT COPY
Trouble shooting
Start
LED is lighted?
Yes
LED is lighting?
Yes
Is backlight on?
Yes
U12 data out?
Yes
END
1. Is Power board output
N0
+5VSB &+12?
2. Is J4 connector good?
3. Is DC to DC OK?
4. Is U1 (+5V) working ok?
It is in power saving
N0
N0
1.
Check video cable
2.
Is the timing supported?
3.
Check sync input
4.
Check VGA SOG rout if analog
(SOG)
N0
1.Check J4 PIN14
2.Is Power Board ok?
It means no data to LVDS
N0
1.Is TCN3 & TCN4 connecting OK?
2.Check +5V & +12V
3.Is panel ok?
4.
Check P5 D-sub Input correct
5. Check analog input route
Page 9-1
File No. SG-0295