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Re: galaxy s4 screen black but phone rings
Sorry to hear about your issue. Unfortunately, it doesn't sound like it's got an 'easy fix'. But before we jump into conclusions, first things first.
With the phone off, turn it on by pressing and holding together the Power, Home, and Volume Up buttons. Wait for the phone to turn on and when it enters Recovery Mode, you can let go of the buttons. Here's where you should know if your screen is still alive or not. If you see ANYTHING on the screen while turning it on (we're going into recovery to rule out any OS issue), then there's still hope and you could probably fix things by doing a factory reset from the Recovery console. But if you can't see anything on the screen, then it means your panel is dead somehow and you should take it for repair.
It could be a loose connector and a simple re-connection would suffice, or it could be a fried board altogether. In any case, only after you open up the device can you tell what went wrong.