Polaroid tv screen goes black after 30 40 minutes, sound is good. No picture. Turn set off and wait a few minutes and the picture returns for a few minutes then goes black again.

It sounds that the off timer has been set to one hour. Check it.

This tv the LCD inverter board is dead,that why is not sustanning backlight for the LCD screen light to have the picture.Call Polaroid for warrenty repair,this tv under a year old.

Could be the signal board has a bad cap, in this case it sounds like you are getting intermitten power to the inverters....when the tv goes down and of course you have audio....Shine a flashlight on to screen and see if you have a picture...look carefully. If this is the case..you have the above problem!

Look at the power supply first since it is easier to get to, look for burnt parts, bad capacitors, etc.
http://en.wikipedia.org/wiki/Capacitor_plague
I would suggest not to try to use the TV until the problem is solved becuase more damages can result.
Please post back what you find.

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It needs a video board replaced most likely. You can find by searching on google for your model. Might cost more than set is worth. Think about new model as they are really cheap in that small size.

check your LCD inverter maybe there is loss connection or some parts damage from inverter.

This is a simple and common problem. The solder joints on the vertical output IC have cracked loose. I actually did a housecall on the exact same set with the exact same symptoms this morning! A good tech will resolder the pins of the vertical output IC and all other major solder joints on the main board and the set will play fine.

I had the same exact problem.
I removed the bulb and cleaned it. There is a small screen at the top of the bulb and it was covered with dust. Once it was cleaned I replaced the bulb and it solved the problem.
Thanks to those who posted the solutions

do you get sound while screen does black? what do you mean by "until eventually it has turned black and will not come back"? is it black from the minute you turn the tv on untill you turn it off? if sound is good but picture is black, it may be the resault of a fried monitor tube, in this case replacement will cost alot. if sound is dead also, them it is probobly power supply related issue. get out your DMM and measure the voltages in the power supply. When the screen goes black, is there still regulated B+ going to the circuitry? Do you still have HV? Is the filament of the CRT lit? Does the set still have a raster (you may have temporarily increase the screen setting to see it)? Do you measure any of the flyback derived B+ voltages that go to the video processing, tuner, Vertical Deflection, and other circuitry?