If the Samsung svc. center replaced all the parts twice and it still does the same thing, look elsewhere for the problem. As a samsung servicer I know their parts dept. is very reliable. Few defective parts. It sounds to me like you have an issue with bad cables. Whichever you are using, HDMI, component video, s-video or plain a/v cables, try using a cheap pair on another input for a few days and see if that doesn't improve things. If you are using tv tuner to pick up stations, try the other r.f. input on the set for a short time to see if it is only happening on a certain source. Odds are very low you got two defective boards with the same problem. Suspect external cables. Good luck, Russmann.
The only other thing I can suggest is a firmware upgrade which is avail. from samsung on most LCD models. Although if you had a main pcb replaced already, I would think it had the update. Not to offend anyone but I can't even count the number of times that the cable co. said it wasn't their fault and were eventually proven inaccurate. If the problem doesn't appear from another device, suspect cable box. I have personally on at least 25 occasions experienced time warner boxes having problems passing a decent HDMI signal. Cable cards ****, too. Good luck, Russmann.
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We are using a Time Warner box and they check it out and it was fine. I will try to attach the set to the cable directly and see if that works. I will also try another input. It seems like the TV hangs up after the first set of instructions from the remote. It takes a few minutes for every new request.
Turned on TV to try your suggestions and it worked perfectly. It held its input setting and did not say "no PC." Strange. I still called Time Warner and scheduled a call. We ran a test over the phone and on the box and it seemed fine. It may be going in and out. Thanks for your help. They extended warranty for 90 days and I will wait to see what happens.
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