It's basically a TV with no tuner. There were heaps of them around in the early home computer days. As most of the early machines were designed to hook up to a TV, at least as a cheap option, this was a simple and effective way to make an inexpensive dedicated monitor.

I have no idea what I'm doing but oh well. Opened it up

Click to expand...

In the words of Han Solo, I have a very bad feeling about this.
On the plus side, any TV repair shop will be able to give you a quote for the repair.

I remember watching the original Star Wars on an Apple II greenscreen monitor from a VHS bootleg. Good times.