Samsung Tuner issue

[Twithers]

I have a Samsung LN46A530 that I picked up and replaced a T-con board in. Everything is working perfectly except for one strange issue. After doing an autoprogram for the DTV or over the air channels, which pulled in all the available channels, whenever I select a channel, the signal cuts in and out. It's not entirely random, but not at exact intervals either. Pulling up the signal strength meter, you can watch it stay at full bars for a few seconds and then drop enough to cause blocking in the picture or even drop to zero bars causing the black screen with the "Weak or no signal" box.

I have gone into the factory manual and the tuner is set to Semco, which I believe is correct (I have tried Alps in the past and it picked up no channels when programming), but I can't find anything else to effect the tuner operation.

The antenna setup is exactly the same as it was on the Olevia I was using before this one.

I have tried various amplifier configurations to see if that would help, but with no luck.

It is pretty un-nerving to watch any channel.

Any ideas?

On a side note: when going in to the factory menu under the option byte, how do you know which screen to select, i.e. 46 L C, 46 D HC, etc.? There are several for the 46" screen. I have cycled through them with only very minimal differences.

Thanks.

[Twithers]

Re: Samsung Tuner issue

After reading some similar posts, I had some othjer info to try and narrow down the possible issue.

-The tuner does actually function and it acquires all the channels I would expect and even some low gain channels that I hadn't previously pulled in with other tv's.

-Some channels stay at full signal strength longer than others before dipping a few bars or dropping completely, but all the channels do it at some point.

-I left it on all night to see if it was a heat versus cold start issue with no observable change.

-I saw a couple posts mention updating the firmware, which I tried but I guess since I already have the latest version installed, it won't load. Is there a way to reflash the same firmware or should I try an older firmware, and if so, how would I make it load that.

That's all I can think of for now.

Thanks.