Left side of tv screen turns white after being on for 30 min

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This seems to be a problem with some older panels. If you are prepared to tackle the problem yourself then try the following.
WARNING there are some very high voltages within the TV which can be LETHAL so the greatest of care should be taken.

With the back of the TV removed, use a hair dryer and apply warm air to all the ribbon cables in turn until you find the one which causes the fault to disappear. Now turn your attention to the faulty ribbon and remake the connections as necessary.

I would suggest you take it to a shop, but I had a 46" Sanyo with this same problem, turned out to be a defective panel

Your TV's primary control board may have gone bad and when the TV heats up to a certain tempurature and then it goes back to normal i suggest a new tv but you can order new parts and replace it yourself, if you need parts I can get a list of parts that may fix the TV

The words "Digital Noise Filter Off" and "digital Noise Filter On" appear on the top left and right and side of the screen and the words " Auto Visulisation" appear on the bottom of the screen all the time when watching normal T.V.(series 5 lcd) and if we make changes regarding in setting in picture option in mode.then after 20-30 min againg it displays same message

Repalce the back light inverter. If you check there are two one is the master and the other is the slave. In your case is teh left.

Thank you

color wheel

I had the same problem and got a TV repair man to fix it for real cheap. The whole fixing took less then 30 min and he goes to your house to fix the TV. He fixed it for an excellent price that left us astonished. He lives in NY. Email me if anyone needs his contact information. You wont be disappointed.

do you still have this tv? what happens if you hit the info button - does it bring up the banner at the bottom of the screen?