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I too had the same problem where my HT30744 TV would lose its color or picture would get blurry. My mom's HT32744 would have the same problem too. They both are refurbished models bought at Value City Dept store.If I gave the cabinet a good hit it would mostly fix the color, but it could also make the picture go fuzzy too, a clear sign of just a loose connection somewhere. So after my wife telling me she was sick of this almost 2 year problem and she was going to buy a new TV on the weekend, I figured I had nothing to lose. So I took the rear cabinet off, unseated the card mounted on the picture tube, applied a little dielectric grease on the connector on the card and reseated the card, removed, re-greased and reattached the card. I have had no problem with either my or mom's which I did the same to since! This is an easy fix that anyone can do. The hardest part is moving the TV and reassembling the rear cabinet. Do not pull the cabinet back out more than you have to, to ease the reassembly of it.
If the TV is less than one year old, I would suggest to call the place where you bought it from and ask them for an authorized repair centre.
The TV should be still covered under manufacturers warranty.
as your problem is
the picture has become blurry/hazy
1 it sounds me that there is a little sparking near high voltage section that is near flyback transformer.please get it check.
2 if it is ok then focusing anode wire going to crt base from flyback transformer is not making proper contact due to some foreign material deposited on it.
please call tech person if you ae not aware of it as tv is a very high voltage device.
You didn't mention if you saw fine white diagonal lines running through the screen from top to bottom. If so, you likely have a shorted Picture Tube which is not usually fixable. If there are no lines seen running through the screen, then it is possible the High voltage transformer which also has a screen voltage and focus control built in that could be bad. I would expect the cost of that part to be about $100, so the repair cost total could approach that of a new set I would guess.
The picture on your TV screen is driven from the center to the top and bottom of the screen by the vertical drive circuit. The fact that you can see the entire picture means you have a problem called foldover. This is caused by a failure in the vertical drive circuit where the vertical saw signal is altered by a component failure within the vertical drive circuit. You cannot solve this problem but any good repair shop should be able to correct the problem at a reasonable cost.