Daewoo L520B Service Manual page 38

5. No Video
5-2.
No video for AV Source
Black
Is OSD normal?
Is the contrast
at its maximum?
Is the output of
Decoder(U5)
correct?
Next Page.
Is the output
of Scaler correct?
Check If
the CON 5 wafer is
well connected at
the LCD panel.
Yes
No
Yes
No
Yes
No
Yes
Check the video
input signal (or
check the J5).
Yes
No
Yes
3. No raster
Set the contrast
up to Max.
Is the input of
Decoder(U5)
correct?
No
Replace the main board
(or replace Decoder(U5)).
Is the input of
Scaler correct?
Yes
Replace the main board
(or replace Decoder).
36
Yes
No