Sharp 50" Roku TV powers up but quickly goes dark (Model LC-50LBU591U)
My tv recently started going dark shortly after turning on. This happened a while ago, but was fixed with a reset and a lot of time being left off. I have tried resetting it again and can't get it to stay on past the loading screen. I have tested the power board and believe everything is fine but I'm not exactly sure what every voltage should be. The backlight remains lit when the screen is dark and I'm not able to see any images when I shine a flashlight on the screen. Does this mean I should replace the main board? I have no problem replacing the power control board or main board, I would just appreciate some help figuring which one instead of buying and replacing both. Thanks in advance!
Edit- aging some pictures for clarity
Edit- to add other board. The only difference between it being disconnected or connected seems to be whether or not it shows the sharp logo before flickering and going dark. When it's disconnected, it just goes straight to the blank screen, when it's connected, it tries to work but flickers out