Samsung LN32B550K1R - No Video (Tuner_Cvbs)

4-10
4. Troubleshooting
4-1-4. No Video (Tuner_CVBS)
Symptom Audio is normal but no picture is displayed on the screen.-
Major
checkpoints
Check the Tuner CVBS source.
Check the Tuner, Check the SEMS03.
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
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Diagnostics
Change the Main Assy
BN94-02709A
No
Yes
Does the CVBS data appear at
#8 pin of Tuner?
No
Yes
Power indicator LED is off.
Lamp(Backlight) on, no video?
Yes
Check the RF source and
check the connection of RF cable?
No
Input the RF source properly.
Yes
Check Tuner
Change the Main Assy
BN94-02709A
Yes
Check the LVDS cable?
Replace the LCD panel?
Please, Contact Tech support
No
Does the DC B33V, B5V_VCCT
appear at #4, #2 Pin of Tuner
Does the digital data appear at
TP8007(FBE_HSYNC_IN)
Pin #19,20,34,35 (LVDS Data clk)of
LVDS connector?
No
Check IC6003 (SEMS03)
Change the Main Assy
BN94-02709A
4
2
No
Check a set
in the ‘Stand-by mode’.
Caution Make sure to disconnect the power before working on the IP board.