When the set is first turned on the picture is fine. After being on for about 30 minutes, the picture gradually becomes very blurry. If the set is turned off for about an hour, the picture is clear again. But after another 30 minutes or so, the blurriness returns.
It sounds like the focus block or flyback is bad.sometimes you can put nail polish on the adjustments controls to make it stay.usually
they are marked from the factory with white marks check and see if they are aligned.but be sure somebody with tech-skills help you.the flyback usually has a screen & focus control.(the big red wire to the tubes or block)
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A bad connection somewhere--when it happens if picture is 3d look in menu for convergence and call up the grid of lines--if they are not perfect you have convergence issue which usually requires parts to be replaced.
In this set sometimes the chips will become flaky and convergence will jump in and out.
If this is an older rear projection TV as the model number indicates, you can unplug and remove back cover.
Inside you will see three large round black lens---these are for the 3 picture tubes: Clean all the dust and dirt off of them with either a lens cloth or a paper towel with glass cleaner sprayed on the towel.
The lens are the light source for your picture and if dusty the picture will gradually become darker and some what blurry looking.
Yes,this tv can be fix it have convergence problems.The convergence board the 2 STK covergence ICS are defective and some or all it resistors are dead.The shop will cost u $300-350 for parts and labors.
They have a history of the Hyper board failing. Usually noise or lines in the picture and the warmup time gradually gets longer and longer.
This board processes all signal from all inputs inside the set and is no longer available from Toshiba.
The only way to get one is from a national company called PTS Electronics who rebuilds or repairs them--cost for rebuilt board is about 220 plus shipping and part number for this model is: Part Number23148024
I have a service bulletin with photos of the board on my computer.
It is a financial decision, not a job for the average do it yourself person to attempt.
The LXI or Sears brand used philips TV's. These sets are known for bad coolant fluid. In between the picture tube and their lenses is a layer of clear coolant. Over time the coolant breaks down and causes the picture to become blurry. This can be a complicated repair involving removal of the picture tubes and lenses. Have a repair shop check it for you. Thanks for using fixya.
If this problem has been gradually getting worse, it is most likely to your picture tubes getting weak, and it is time to replace the set I'm afraid.
If the red is smearing off to the side of reddish objects in the picture it is most definately the tubes.
It sounds as though your Picture tubes are getting weak or theres a bad capacitor in the screen drive circuit. The only way to tell would be to call in a tech to diagnose this problem with his test equipment. A tv set is not a place for an unexperienced person to play with. Good Luck