Troublesome LCD/Sound on an IBM 570(2644-3AG)

[jogego]

Hi, I need help fixing an old 570 I have. I have three problems with it:

1. At times the screen goes all fuzzy and distorted but when i give it a tap, it clears up. I suspect maybe a cable is loose or needs replacing.

2. The screen doesnt stay up. If its at anything other than straight up, it falls down. I am thinking it might be the hinge that needs replacing?

3. Sound doesnt work all the time. I thinn maybe there might be a lose connection as when I move the to and fro, the sound comes on, then when the screen moves again, the sound goes off.

Any help will be greatly appreciated.