The back light in the Tv is out

The back light in the Tv is out

I know there is a picture on the screen because I get sound and sometimes a backlight picture. However I can’t get the back light to come on sometimes and right now it’s been weeks since it came on and I get sound whenever I turn it on. Does anyone have the Schematics for a M470VSE VISIO TV SCREEN?! Trying to fix it myself

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