iPhone Screen is on but Black

My iPhone 8 plus’s screen randomly turns black, while using. It isn’t turning off but rather the screen just goes to a black color. While in this state I can still click things and was even able to swipe up and start playing music. I powered the phone down completely and powered it back up but the issue persists. I recorded time intervals it took to go to this and it varies dramatically. The lock screen will come on and stay on until it times out and other times only last milliseconds before going to this “black” but still turned on mode.

• Also my home button does not work but this is an unrelated issue ( the ribbon cable broke during a screen replacement about 7 months ago), but keep that in mind when a fix is suggested.

—UPDATE: I have opened up the phone and check internal connections to the motherboard and everything is connected just fine. Then about an hour later the screen stopped producing the black screen and now produces no light at all. However, the touch pad still works (I can hear when a pass code is being typed in, but there screen appears to be off.)