Just scored a nice looking Asteroids that appears to be a two owner HUO machine. We bought it playing blind with some manner of screen collapse as demonstrated in the attached pic. According to the seller it started intermittently but has been there consistently for a while. I noticed after I left it on for about a ½ hour it horizontal gave in as well and collapsed further into a dot. I know scarcely little about monitors and nothing at all about X-Y vector. Could you all tell me where to start checking or point me to a good thread if you know of one? I'd assume there are some voltages to check before assuming diodes and capacitors, but what do I know...
Thanks everybody for any input you can suggest.
Thanks everybody for any input you can suggest.

