how to r/r mother/power board 50' flat screen

I need to replace powerboard on a 50' westingouthouse flatscreen. It appears to be combined with the video board as well. Static and flicker w/without video input. (Flicker on menu screen also) So cables and source are not the issue. Down and dirty swap advice would be welcome.

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Clarification Request
50 foot flat screen.

I think there's a typo there as most of those jumbo-tron screens are maintained by the company that made them.

As to the brand I worry there's a typo there as well. Please correct those so there's no guessing how huge or what make it is.

If a board is all in one, then it's just one board that you find on, ebay or where ever you find such things.

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Clarification Request
Westinghouse? Meh

It’s essentially disposable.

Find a sale online for a $200 HDTV. With that you at least will get a one year warranty.

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