JP1 Remotes

I noticed that there is a pot between R56 and 73+ called vertical size (100k). Adjusting that helped a lot of the voltage readings on the left side of the circuit. My main concern right now, is the 30+ going to the vertical output. That is waay low. Not sure why that is.

recieved an arcade with a broken monitor for free. This is really my first attempt at repairing.

Monitor: XM501-10 (CRT: Black & White). TTL

Scenario:

When powering up the monitor, all that is visible is a bright horizontal line that is in the middle of the screen. So, this seems to be a ...