I just solved this kind of problem with my VIZIO VP504FHDTV10A. It was main power supply that went bad. You need to open back panel cover and right in the middle you will see two powersupply boards(subpower board(smaller) and big main powersupply board). Just get board part/model # and search it on eBay(what I did). It was approx. $100. Good luck.
And one more thing... From what i know capasitors are not always a problem. Normally they are not dome and cost quite high. There are a lot of elements that can go bad. Even a small diode can cause a problem due to power flick or something, and to find what went bad you will have to have an expensive equipment and/or manufacturer technical documentation. The best way to test would be to measure voltage on pins 1 and 2 of P25 connector. It should be 15V. If nothing there just get a new board...
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SOURCE: My Visio 50" Plasma Model#
Have you removed the back and looked for Bad Capaciotrs on the power supply board?
Capaciotrs will be vented or puffed up on Top. 1000uf 16v,2200uf 10v 3300uf 10v etc....
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