The short answer is, there's no way to be sure just how deep the issues go without trying it. If you've taken all the necessary precautions, and opened it up, dried it out, and are sure it's ready to be operational, giving it a new display is likely worth a shot. If you [product|IF268-000|get the display from iFixit], we have an amazing return policy where you can return it if it doesn't fix your issue, and you'd only be out shipping in the worst case.
Best of luck in your repair!