Samsung UN19C4000PD Service Manual page 38

4. Troubleshooting
4-1-5. No Video (Tuner_CVBS)
Symptom Audio is normal but no picture is displayed on the screen.
-
Check the Tuner CVBS source.
-
Major
Check the Tuner, 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
4-10
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Yes
Check the RF source and
check the connection of RF cable ?
Yes
Does the DC TU5V_PW, TU33V_PW
appear at TP - TUNER_33V, B 5V
Pin of Tuner ?
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 RF source properly.
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