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Sorry this tv can't be fix acept replaced the whloe picture screen panel itself,the tvs screen panels are in of the limited production by the tvs industries,only can buy picture screen panel from the tvs themselves and it 90% important to the tv,will cost u the same as a new tv to get picture screen replaced.Sorry doesn't worth as a whole tv anymorre the tv now only worth as salvages tv for it electronic boards for spare parts for other tv,that it.
I think I may finally have the answer for the "black screen of death" for the 42" Polaroid LCD televisions. I was having the same issue with the screen going black after a couple minutes of being on. I would shut it down then turn it back on and it would work again for 5-10 minutes. On the "power board" which is the board on top, there is a little red light that turns on when the screen would go black. above that there are 4 little switches, the lower on says BURN. I simply switched that over and the television has been working for 2 days for 8 hours + each day. Hope this help. Let me know
your picture tube is not blown you are having problem in the color circuit there is an ic that controls that circuit,the tv is also having a vertical problem an ic also controls that circuit you will have to call a tech to repair your tv good luck