Sansui SMX4019SM User Manual page 26

Horizontal
interference lines
(PC mode)
The image is very
light or very dark
(PC mode)
The PC function
does not respond
Interference lines
in the RCA
connection source
If the problem
continues
Note: There will be full images that the brightness will be reduced if
the TV is with a static image for a long time. So please do not keep
the TV too long in a same menu or image whose brightness and
contrast are high.
Adjust the horizontal Audio sound in the main menu to
clean the horizontal lines.
Adjust the contrast or brightness level in the main menu.
Check the computer settings if the resolution is
compatible.
Make sure the good quality of the cables.
Unplug the power cord and wait 30 seconds, connect
again. If the problem continues with your TV, do not try to
repair it, please contact the service center.
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