Switch screen show a very dim gray screen.

I was working on my switch. I’m not sure if I damaged the LCD or not. When I turn the switch it take a couple minutes the fan spin and nothing pops up beside a light gray dim. I’m not sure if I need to buy a new LCD or not

That means the back-light is showing but no lcd so either the fpc connector is damaged or the actually lcd ribbon cable

Yeah, mostly likely a bent pin in the connector. There are other things that can fail and cause it, but start there.