Chosen Solution

I have an iPhone 6 plus that has been repeatedly run over by cars. The screen was torn off, the shell was bent and the battery was crushed. Whilst it was open, it got rained on and the water damage indicators are red. The logic board looks ok and isn’t cracked. I took the battery out so it didn’t leak. I was wondering if there was any hope in saving it, with a new battery and screen. The back camera is missing too.

I agree completely with Mayer. The only value that that logic board has would be if you have another phone to install it in as a test. Since you don’t, it has no value for you. If you walked into a shop with a whole phone that had a questionable logic board, they might test it for you for free. But you will be walking in with a box full of broken parts. No one will test that for you for free.

The possibility of that logic board being undamaged sounds like it is very slight. I think you will be wasting time and money.