Samsung UA40B7000WM, Service Manual

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4-18
4. Troubleshooting
4-1-6. No Video (Video CVBS 1)
Symptom Audio is normal but no picture is displayed on the screen.
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Major
checkpoints
Check the Video CVBS source
Check the Chelsea
This may happen when the LVDS cable connecting the Main Board and the Panel is disconnected.
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-
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Caution Make sure to disconnect the power before working on the PD board.
Diagnostics
CN3001 CN3005 CN3004
CN3011
CN3001 CN3005 CN3004
CN3011
Yes
Check the LVDS cable?
Replace the LCD panel?
Please, contact Tech support
No
Does the digital data appear at
pin14~42 of CN7005?
No
Check IC7001
Change the main PCB assembly
5
No Check CN3005
Change the main PCB assy
No video
No
Check the video source and
check the connection of
video cable?
Does the signal appear at R3070?
Yes
Yes
Input a video signal.
Check the connected cable.
5
Yes