Samsung UE40C69 VS Series Service Manual page 64

4. Troubleshooting
4-1-4. No Video (Tuner_CVBS)
Symptom Audio is normal but no picture is displayed on the screen.
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Check the Tuner CVBS source.
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Major
Check the Tuner, Check the Valencia.
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checkpoints
Refer to the next page to check the lacation such a CN201 or IC201 SVC Manual mentioned.
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5
Diagnostics
2
Caution Make sure to disconnect the power before working on the IP board.
4-14
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Yes
Check the RF source and
check the connection of RF cable ?
Yes
Check the Power of Tuner ?
Pin #5 of Tuner : B33V_Tuner
Pin #3 of Tuner : B5V_Tuner
Yes
Check the CVBS data out of IC6001 ?
L7515 : CVBS data
Yes
Check the LVDS clk signal at output of
Main board ? (TX1~TX4)
TX2_BP, TX2_CN, TX2_CP, TX2_CLKN
TX4_BP, TX4_CN, TX2_CP, TX2_CLKN
Yes
Check the LVDS cable?
Replace the T-con / LCD panel?
No
Check a set in the 'Stand-by mode'.
No
Input the RF source properly.
No
Change the Main Assy.
No
Check Tuner and IC6001.
Change the Main Assy.
No
Check IC7001.
Change the Main Assy.
No
Please, Contact Tech support.