[Q] Black Screen, but phone appears to work
Picked up a HTC one S of off a mate today who dropped it and cracked the screen. Replaced the screen for him but it's still not working. Here's symptoms and what I tried.
-black screen all the time
-phone boots, three buttons at bottom lit up, LED flashes green and if I call him the phone vibrates
-if I hold down the power and volume buttons down, once the home lights have flashed 15 times I see a few lines of flicker for a fraction of a second on the screen and then nothing.
-Touchscreen appears to work as it vibrates when touching it (and I'm inputting text presumably?)
-He hadn't customised/flashed any other ROM on there.
Can someone perhaps shed light on next steps for troubleshooting?