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The white screen and nothing else usually indicates a failure of the filter capacitors in the power supply board. When these capacitors go out the voltages are not correct so the TV can not power up right. You can rebuild the power board by replacing the bad capacitors and this should bring the TV back to life. Here is a link to a repair guide for this power supply board. http://www.ccl-la.com/blog/index.php/repairing-a-polaroid-tla-01911c-with-a-bad-power-supply/
Either the power supply/inverter board is bad, or the bulbs are bad - or poorly connected. In my case, the solder joints at the end of the bulbs in the top and bottom were horrible. A quick resolder on the corroded bits and good as new.
I had the same problem. I replaced 14 capacitors on the Power supply board. I used Panasonic FC series. You could look for swollen capacitors or ones that are oozing. For sure replace these. My set had capacitors that are known to cause problems so I replaced all of them even though I saw no swelling of oozing. Be sure you label all connections carefully when you disassemble.
Well, it's great and wonderful that you have a high-speed internet service, but your TV's audio isn't biased about internet connections. You forgot to plug in the line-in cable from the green port of your computer to your TV.