kal2500

I have a 2015 Sierra Denali in the shop now for the black screen. I had my cabin air filter changed recently and when I was driving shortly after that the screen just blacked out. Not sure if the two maybe related or not, seeing as the HMI is right next to the filter. If you touch the screen it has an audible click as if its working just not displaying anything. It came on temporarily and then went black and has been for the last 3 days. Took it to the dealership for the software update but that didn't do any good. Dealer is saying now that I need a new screen and maybe HMI. Of course I have more than 36K miles so no warranty..... I'm open for opinions if y'all have any. Id rather not throw $1,200 worth of parts at it and hope it fixes it. Do any of y'all have a wiring schematic from the screen to the HMI? I will happily chase wires before spending the money for new parts that MIGHT fix it. I'm hoping something just isn't making good contact, but I know that's wishful thinking.