Iphone display doesn't turn on
I had bought a used 3g one year ago. Its wi-fi wasn't working so i applied the "oven method". It worked out but it kept losing it after a while. So last month, i (I know i didn't do good on this) put it into the oven again, but this time i heated the oven 5 degrees more.
To make a long story short, after this operation,
1. When i power it on, the display shows nothing, no matter what i do.
2. When i plug it into the PC, it recognizes it as in the DFU mode or sometimes in the "Recovery Mode". But again, the screen shows nothing.
3. When i try to restore it,
a. If i do it when it is in the DFU mode, i get errors 23, 31xx.
b. If i do it when it is in the Pwned DFU mode i get 16xx.
So, what do you think the problem could be?