Samsung LN26C450E1H Service Manual page 36

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.
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 TP-SIDE_AV_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 CN701, CN704.
Change the Main Assy.
No
C450: BN94-03377Z
C459: BN94-03377M
C539: BN94-03379B
Check IC301 (SX1)
Change the Main Assy.
No
C450: BN94-03377Z
C459: BN94-03377M
C539: BN94-03379B
No Please, Contact Tech support.
4. Troubleshooting
4-17