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Tv black screen with sound and the backlight works just no picture

Alright can anyone help me out I have a cheapo tcl 65 in tv where the picture cut out. The backlight still comes on and works I have sound I can here it able to click through the menus the picture just cut out. I read online that it's the t con board so I replaced that and no dice so I figure I'd replace the main board and power supply and that DID work for about 5 min I had it all laid out the screen came back on I was like sweet I fixed it then I hung it back on the wall turned it on it came on for a few seconds flickered and went out again I don't know if the means I just have a short somewhere or if I fried my new parts I just put in or what I'm kinda at a road block here. Can anyone help me?

Update (06/30/2022)

The first picture is just the screen directly after replacing all the boards when it worked for 5 min

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Update (06/30/2022)

This is the main board i replaced i have it plugged in just so you can see the backlights

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Update (06/30/2022)

Power supply

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Update (06/30/2022)

T con board

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Update (06/30/2022)

Full layout the inside isnt as dirty as it looks in the picture either but there is some dust

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@dakblack my biggest concern with that is that you said the backlight comes on. You do want to verify this for us. Make sure that you can see it with the back cover removed and through the many holes in the sheet metal for the panel. TCL is one of those that uses inferior backlight strips. As it stands and you already having replaced all the boards there is only a few possibilities eft, like a bad panel could be one of those, which would not be good. Double check the work, all of your ribbon cables etc. Post some good pictures of all of the boards as well as the interconnect cables etc. Let' s see what we can determine without any schematic (unavailable) but double check on the backlights.

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I posted pictures below hopefully you can see them thank you for your reply

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But yes after i replaced all the boards the TV came back on and worked great again for about 5 min before the screen flickered and I lost picture. Same thing I can see the backlight both on the front of the screen when it turns on and through the holes in the back (i tried to get that in the pictures I just posted) I have sound I can click through menus it sounds like just the picture is gone I was hoping maybe just the ribbon cables had a bad connection but I checked them got a small amount of alcohol on a q tip tried to clean the connections made sure they were dry put them all back together and still nothing

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Dakota Black will be eternally grateful.
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