Chosen Solution
I have just replaced my lightning and headphone part in my phone and have reassembled my phone when I came to power up me phone the screen doesn’t light up I pluged it in to charge and the Apple logo come up as normal and then goes a dark grey colour and idea to what could fix it.
It’s hard to say really could be a number of things like damaged screen, damaged battery . Damage to the motherboard when taking connectors off.. New Battery would be the cheapest and first thing to try
