LCD not working and phone vibrates repeatedly
A friend gave me a black iphone 5 to fix and it was working before the repair but the screen was badly damaged. The LCD would light up yet I could not hardly see anything on the screen. I let it sit for a couple days and the battery went dead. I performed the repair step by step carefully and did notice all the water sensors were red, yet my friend didn't say anything about it getting wet. Got the screen on and connectors seated properly and LCD would not light up. Let the phone charge for a bit and it came on fine. I heard it beep. I plugged the phone into my macbook and it recognized fine. I was able to restore the phone and that didn't help the LCD. I did a soft and a hard reset and it still didn't help. I disconnected the battery and didn't help. I tried another brand new screen and still didn't work. So I put the phone aside for a day or two and battery went dead again and now when I plug it into either my windows or mac it won't recognize. I plug it into the wall to charge and after a few minutes I hear a beep and it starts to constantly vibrate repeatedly.
I have no clue and I'm frustrated! HELP!
Is this a good question?