My father's TV is doing the same thing, however the picture is still working. You can see the picture but there are vertical green/red lines going through the entire screen. I tried an alternate source (DVD) instead of the digital cable box and go the same thing. Can anyone help???
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Most likely a bad Vertical IC or bad connections on the vertical IC. don't continue trying it on. If you have a bad connection it could do more damage. You also could damage the CRT ( picture tube ). If you remove the cover and look at the bottom side of the PC bord with a good magnifiing glass you may see what looks like rings around the leads comming from the Vertical IC. The Vertical IC is mounted on a heat sink usually towards the front of the set looking from back. If you do see the rings around the leads try reheating with a solder iron. If this dosen't fix you most likely need a new IC.
This is a problem with the vertical circuit. This can be as simple as poor connections at the vertical IC or a defective IC. If you can solder, you should be able to fix this yourself. Let me know if you wish to attempt the repair and I will supply additional details and instructions.
If your seeing vertical line across the screen you need to check the components in the vertical stage as well as the vertical IC could be bad, or the yoke could open.
Also check if any voltage reaching the vertical stage.
the person you talked to at samsung is more than likely a customer support rep that does know anything but what his computer tells him. i have seen this symptom several times in many makes and models. if you can give me your full model number i will give you a part number to fix this issue.