Trouble Shooting - LG 42LV4400 Service Manual

Chapter 9
MONITOR DISPLAY NOTHING (PC MODE)
AC power is ON?
LED is white?
Is backlight on?
U15 data out?
1. Check TCN1 & TCN2 Connect is good?
2. Is panel working ok?
END
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CONFIDENTIAL DO NOT COPY

Trouble shooting

Start
N0
Yes
N0
N0
Yes
N0
Yes
Yes
N0
Yes
1. Is Power board output
+5VSB ?
2. Is J4 connector good?
3. Is fuse(F1) OK?
It is in power saving
1.
Check video cable
2.
Is the timing supported?
3.
Check sync input
4.
Check VGA SOG rout if analog
(SOG)
1. Check J4 PIN14 and PIN12
Are fuse( F2 ) OK?
2.
3. Is Power Board ok?
It means no data to LVDS
1. Check U15 :DV33 & VCCK &
AV_3V3 & AV125 & DDRV
2. Check Y1 is OK?
Page 9-1
File No. SG-0000034