No Video (Tuner_Cvbs) - Samsung LN32B550K1R Service Manual

4. Troubleshooting

4-1-4. 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 SEMS03.
-
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.
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 B33V, B5V_VCCT
appear at #4, #2 Pin of Tuner
Yes
Does the CVBS data appear at
#8 pin of Tuner?
Yes
Does the digital data appear at
TP8007(FBE_HSYNC_IN)
Pin #19,20,34,35 (LVDS Data clk)of
LVDS connector?
Yes
Check the LVDS cable?
Replace the LCD panel?
No
in the 'Stand-by mode'.
No
Input the RF source properly.
No
Change the Main Assy
BN94-02709A
No
Change the Main Assy
BN94-02709A
Check IC6003 (SEMS03)
No
Change the Main Assy
BN94-02709A
No
Please, Contact Tech support
Check a set
Check Tuner