Samsung LA32C550J1F Service Manual page 56

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.
-
Does the DC B5V_TU_PW, TU33V_PW
Diagnostics
2
Caution Make sure to disconnect the power before working on the IP board.
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Power indicator LED is off.
Lamp(Backlight) on, no video ?
Yes
Check the RF source and
check the connection of RF cable?
Yes
appear at #3, #5 Pin of Tuner ?
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?
4. Troubleshooting
No
Check a set in the 'Stand-by mode'.
No
Input the RF source properly.
No
Change the Main Assy.
Check IC1102 (SX1).
No
Change the Main Assy.
No
Please, Contact Tech support.
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