Samsung UE40C69 VS Series Service Manual page 68

4. Troubleshooting
4-1-6. No Video (Video CVBS 1, 2)
Symptom Audio is normal but no picture is displayed on the screen.
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Check the Video CVBS source
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Major
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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4
Diagnostics
2
Caution Make sure to disconnect the power before working on the IP board.
4-18
Power indicator LED is off.
Lamp(Backlight) on, no video ?
Yes
Check the video source and
check the connection of video cable?
Yes
Check the CVBS signal at Input of IC6001?
SC1_AV1_CVBS_IN : C6140
SC1_AV2_CVBS_IN : C6141
Yes
Check the CVBS clk signal
at output of IC6001?
R6011 : ASN_CVBS_CLK
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 video source properly.
No
Check CN3004 or CN3005.
Change the Main Assy.
Check IC7001.
No
Change the Main Assy.
No
Check IC7001.
No
Please, Contact Tech support.