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The most common cause of white screen and no picture problems on this unit is a failure of the power supply board. Here is a repair guide with full dis-assembly and repair instructions that should be able to get you back going again. This guide is for the Visco TVs but the boards are the same as the Polaroid model
The problem you are having is the power supply in the TV is failing. When you try to power the unit on you get on power or a slow turn on. It also can explain the problem of not running at full 1080p resolution because the higher the resolution the no power is required to operate the TV. Check out the article that explains the problem and how to repair it.
It sounds like the blue CRT (picture tube) is failing. The part number for this is 8-733-575-25 but you will need a technician to replace it for you as there is mechanical and electrical alignment to with with it. At that point it probably isn't cost effective to repair the TV. Please take a few moments to rate my answer. Thank you.
it maybe you blue crt (picture tube). mine turn blue and then shuts off. i got it repaired for 460. 300 for the part 160 to install. you can try to adjust the voltage settings behind the speaker screen and see if that clears the problem. if not its you blue crt.
Your blue crt has a short - you can verify this by unplugging the socket from the blue crt and powering up the set and you should see a yellowish looking picture with just the red and green crt's operating. You can try turning down the screen control pot (B) for blue with the blue crt on (just to the point where you no longer see retrace lines in the picture on a blank input)Sony has had a lot of problems with the crt's on these models and sooner or later all the crt's will fail - For a permanent repair all must be changed.