Black screen

Hi,

I am hoping someone here can help me out. I have a mid-2015 Macbook Pro, and recently the screen stopped working. For a time, it would go black just for a few minutes, but now I think it's permanently black. I've tried resetting the PRAM and SMC resets to no effect. I also installed a new battery recently, and to do that I had to disconnect and reconnect the display connector to the motherboard, which sometimes apparently fixes the problem but did not in my case. The computer otherwise starts normally and I can still use it by connecting to an external monitor. It would seem that either the display connector or the motherboard have gone bad, but I wanted to see if anyone had any other ideas before I go ahead and buy/install a replacement display.

Eric