Hi
I have exactly the same problem with my a90.
Everything was working fine, I even managed to pay for something using NFC in the morning and then all of a sudden the screen started playing up. It first became jittery and the touch screen functions wouldn't work at all. The display was on and things were moving on screen but I had no control and the touch screen wasn't responding.
I then done a reset using the volume and power button and it would reset the phone but I still couldn't use the touchscreen to get any further.
Eventually after a few resets and some time to rest in between, the phone screen decided to go completely black.
The phone still vibrates if you do a reset and I can still hear the 'ding *****' sound, however it seems there is no power getting to the screen to display anything.
I have always used to original charger it came with and the phone hasn't been dropped or had any damage to the screen.
I have contacted Samsung on the phone who took my details a few days ago but no one has been in contact since 😠
Shocking customer service from such a big company and now I have a phone that I bought directly from Samsung in December, doing nothing whilst my old one plus phone of over 2 years is back being used and working fine...(even with a slightly cracked screen!)
