Why does my picture occasionally appear scrambled?

Sounds like T'Con board fault. For some models of Samsung LCD TVs, this part is built in the panel, means non-replaceable. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

CONVERGENCE PROBLEM. FIND A HONEST TV TECH. MAYBE A $300 REPAIR

get a hdmi to dvi cable

if you can get another one for a reasonable i would certainly consider that. the cost to get these lcd's fixed sometimes is not worth it. you seem to have more than one problem with the set.

Bad grounds and bad caps will cause the problems in this tv. You will need to replace several caps and resolder the tuner itself and that means taking the tuner out in some cases and rework it. This is very time consuming and needs great care not to destroy the tuner. And reinstall the tuner to the board. You need the cap check to locate bad caps and visual to see bad grounds on any Ic on heatsinks. If you are a do it yourselfer fine.. If you cannot do this I would just replace the tv.

The pixel problem your having is signal strength related, the sound is always affected first. If your on cable, have them come out and check the signal strength first.

Um...well when mine does that i unplug it and hold the power button for ten seconds and then plug it back in. Always works for me ;-) hope it works for u.

I have the same problem here as well, except that it has been happening so long that now it doesn't get completely clear. The picture was great at one time :-(

i know this problem, happened to me with the comcast Motorola HD receiver box. The key is with the setting in the cable box. Switch on the TV. Set the channel to normal tuner channel 3 or HD input. Turn off the cable HD box. Press the Menu Button on the Cable box or the remote. You should see a Menu. Use the cursor keys to navigate The default setup is also one of the option, Right click on your cursor keys acts like the computer keyboard enter key and applies the change. The default setup is 16:9, the shacking would happen if you have set the picture type to "PAN SCAN". change it to either 16:9 or 4:3 Letter Box. The shacking should stop. Hope it helps.

do you want to sell it