Samsung UE40D500 BW Series Service Manual page 58

4. Troubleshooting
No Video (Video CVBS)
„
Symptom Audio is normal but no picture is displayed on the screen.
-
Check the Video CVBS source
-
Major
Check the Main Chipset.
-
checkpoints
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
-
4
2
Diagnostics
Caution Make sure to disconnect the power before working on the IP board.
4-30
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
PIN - COMP2_Y_CVBS ?
Yes
Does the digital data appear at
TP-E_TXCLK+, E_TXCLK- ,
O_TXCLK+, O_TXCLK- ?
Yes
Check the LVDS cable?
Check the T-Con B'd?
Replace the LCD panel?
No
Check a set in the 'Stand-by mode'.
No
Input the video source properly.
Check CN502_NEU.
No
Change the Main Assy.
Check IC1111 (X5).
No
Change the Main Assy.
No Please, Contact Tech support.