Luckily you can get a working original GB for under $30. You can replace the screen if you are tech savvy but you sort of have to know what you are doing.

Whenever I hear stories like these it just reminds me of the fact that eventually, all games will basically be played through emulation only. We're probably the last generation who will be able to acquire working models for an affordable price. 30 years in the future it will be like trying to buy a driveable Model T Ford with all original parts. Not going to happen unless you are a millionaire. It's one reason I started getting into electronics repairs as a hobby, eventually every single one of these machines will be broken and the only real way you will be able to salvage them is to fix it yourself. I wish I could go back in time and rescue my original NES and GB, I could probably fix them with what I know now.