Samsung UN19C4000PD Service Manual page 44

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.
-
2
Diagnostics
Make sure to disconnect the power before working on the IP board.
Caution
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 - COMP1_Y ?
Yes
Does the digital data appear at
TP - 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 CN701.
Change the Main Assy.
No
26" : BN94-03399B
22"/19" : BN94-03399C
Check IC301 (SX1)
Change the Main Assy.
No
26" : BN94-03399B
22"/19" : BN94-03399C
Please, Contact Tech support.
No