You see this issue only on TV channels using an aerial on your TV set? Or do you also see it affecting your DVD player and/or games on your TV?
How about your DVD? It sounds like your main board has a problem with the tuner, but a DVD or anything that uses a Video input instead of a Tuner /Aerial input will tell us if the problem is only associated with the tuner. I don't know if you have anything else connected to the aerial, like an RF power amplifier to boost the signal, but I have seen those wear out over time. Usually if you have more than 1 TV connected to an aerial and you're about 30 + miles from the transmitters, you need an RF amp on the aerial. 20 miles or less, and the RF amp isn't really a necessity.
Testing it with a DVD player or anything that connects to the Video inputs completely tests everything but the tuner on a TV set. That's why we ask how the picture behaves with a DVD player. Most people have them in their homes.
Whoa...14 years and right by the ocean ? You know, if it's outside the first thing I would do is to replace the Balun that connects the Aerial to the Coaxial Cable ! That one devise is not going to handle those conditions.
This is a Balun, and it's job is to transfer signal from the Aerial to the Coax cable. Sun and Salt will have a major impact on it.
What about the quality of the picture on the other TVs in your home? Are they suffering too? If so, that balun would be the one part I'd replace.
However, if the other TV sets do have a great picture, and this unit doesn't....
When you are JUST out of warranty -- That does NOT mean that the manufacturer wouldn't EXTEND the warranty to cover the cost of the repair. Most people don't call the manufacturer and tell them "it's ONLY one month out of warranty and my TV reception is POOR compared to two other TVs in my home".
Heck it's less than a month !
You said your son connected it to the DVD...
"when our son connected the TV he did so through the DVD"
Does this DVD also record TV shows for you? Or is it simply a DVD player that might use channel 3 or 4 to show DVDs?
The more information you give me, the more concise my answer will be. I'm working with this --
it has become worse over the last week, sometimes it doesn't effect all channels but last night I could not get any channels to work, the picture breaks up all the time & the sound doesn't or can't get through
And when I read that, the worsening of the signal, I'm looking at a TV tuner that's getting Weaker and weaker, or the Aerial's signal power is dropping. That's why I suspect the Balun in your environment.
But the other TV's are connected to the same Aerial, so they can be used to test the signal strength on your Aerial. If all of them are bad, then the Aerial is faulty.
If you only have that ONE TV with a bad picture, then it could be the TV Tuner, or anything connected to the TV's Coaxial Cable. It could be the DVD if it runs on channel 3, it could be a bad aerial splitter that splits the Aerial's signal to all 3 TV sets (Very unlikely, but I did have one that was bad years ago).
We honestly need to check one of the other TVs, and if you can, connect it to the Coax that's presently on the TV in question.
If it's clean and clear on that coax...that's when you pick up the phone and call the manufacturer and complain that it's just a couple weeks out of warranty.
Samsung doesn't abandon you the moment your warranty expires...I've seen them extend the warranty on TV's dozens of times.
At least check the other TVs, and TRY to get a smaller TV over on that Coax if you can.
You want to make sure that Coax is ok, before you call Samsung about your TV set.
That is what I would do.
This is what I would do....run the TV set. If your tuner is bad, it may simply need TIME to warm up and start failing.
It would fail even on a good day of reception.
The thing I would key in on....the actual WEATHER. If you get BAD signal on windy days, then the BALUN is the first thing I would replace, and simply because Broken Wires are affected by wind or any movement.
But a tuner....if it's GOOD and then it's BAD....I'd test it by running it and keeping track of WHEN the TV pixellates !
The reason...If a tuner is bad, it can fail when the TV is just started up....it can fail HOURS after running...or it can fail ALL the time.
But it will do it CONSISTENTLY.
So...do you recall if your Picture CONSISTENTLY went bad the moment you turned it on? How about 20 minutes AFTER it is turned on? 2 hours later it goes bad?
If it takes 2 hours for it to go bad, it's going to Consistently take two hours.
If you have a problem with the aerial, I would expect it to CONSISTENTLY give you problems on windy days. And if I remember correctly, the wind STOPS when the sun goes down near the ocean. 30 Kms is only 18 miles...I think you're ok distance-wise.
Think about WHEN you see a bad picture and when you get the good picture. Look for some consistency, and then fill me in about it.
Let me ask you...is your area presently Transitioning from analog transmission over to Digital transmission?
If you seem to see issues related to certain channels coming from one multiplex and the other channels from other multiplexes are reliable, it is a possibility that the one source of TV channels may simply be ramping up and down their power as they try to bring the channels online.
We had one station that took several weeks before it finally stabilized. I think it was 55 Fox in our area. 21 had an issue for a couple days when they came online, but I do recall 55 having some good days and then some bad days, where all you could get was Analog 55. Digital was coming and going for several weeks. 55.1, 55.2 and 55.3 were all being affected.
If ALL the channels were affected, I would think your problem is related to your TV or Aerial, but if I'm reading your information correctly it sounds like you may only be experiencing this with a Single network like ABC as an example.
So, like today you checked all the channels and your BAD channels worked just fine the moment you turned it on, and has been running fine for hours now?
I've been hearing of a lot of issues regarding Channel 7, but not much about 9 and 10.
7 to 12 is VHF Hi Band, 2-6 is Vhf-Low band....maybe the Hi Band switcher isn't right.
Tell you what...we really can't test this theory until the problem appears, but if you lose Channel 7, Check channels 7 to 12 and channels 2 to 6. See if 7 - 12 is all bad, and 2-6 is all good.
There is a bandswitching circuit that if it's bad is going to affect all those channels in the same band. 7 to 12 would go bad if that's the case.
Personally, I still think you should contact Samsung, but you really need to get some information about how the TV fails so it can be relayed to Samsung.
This is like a Jigsaw puzzle...putting bits and pieces together to get the Whole Picture.