I had a similar problem with mine, i had to change couple of caps but it still would not power on. I ordered one online and it seemed to solve the problem. the power supply board for the TV are a bit expensive but this guys over at had one for under 200 dollars, http://myoemparts.com/power-supply-boards/53-bn96-03736a-pspf771f01a-power-supply.html
Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.
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