Samsung LA22B450C4H Service Manual page 212

4. Troubleshooting
4-1-7. No Video (Video CVBS)
Symptom Audio is normal but no picture is displayed on the screen.
-
Check the Video CVBS source
-
Major
Check the Chelsea.
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
Diagnostics
4
2
Caution Make sure to disconnect the power before working on the IP board.
4-16
Power indicator LED is off.
Lamp(Backlight) on, no video?
Yes
Check the video source and
check the connection of video cable?
Yes
Does the CVBS data appear at
TP - 7045?
Yes
Does the digital data appear at
Pin #19,20,34,35 (LVDS Data clk)
of LVDS connector?
Yes
Check the LVDS cable?
Check the T-Con B'd?
Replace the LCD panel?
No
in the 'Stand-by mode'.
No
Input the video source properly.
No
Check CN7005
Change the Main Assy
No Check IC4010 (Saturn4)
Change the Main Assy
No
Please, Contact Tech support
Check a set