iOS 10.2 update broke a recently replaced screem

No idea if these are related, but I replaced my screen and then a few weeks later the screen just died after an iOS update.

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I replaced my screen a few weeks ago. The process went smoothly, although I had to hold down the power/home button to get it to start up. I had to do the same thing again a week or so later when I needed to restart the phone for another reason.

A few weeks later, I did an iOS update (10.2). The phone downloaded the update, did the spinner thing for a bit and then something odd happened. It asked for a password and returned me to the home screen like it was done... I started using the phone for a bit and then the screen suddenly turned off (no LCD, no backlight).

Now, a mix of things seem to be working and not.

- The phone happily mounts in iTunes.

- I was able to do a factory restore, and it mounts in iTunes, but the screen never turned on during this process.

- Verizon *does* recognize that it's connected to the cellular network (calls don't go to voicemail), but there's no sound or vibration.

- The phone doesn't vibrate when it's plugged into power or a computer.

I tried reseating the display connector, but that didn't seem to do anything.

Thanks for any advice