Sega Astro City - Complete dead monitor?

[kazuma]

If you want to get rid of it, you need to ground your cab by replacing the two prong power cord with a 3-prong one that has a grounding connector.

Noted, although I actually have done this already as a precaution. Assuming I either did it wrong, or it's because it's being tested outside of the cab without any of the grounding points?

Also, gave the board a full recap, but it still seems to exhibit the same behaviour as before. Is there anything else I should try checking? And does it matter which direction the degaussing coil is connected to the board (I've re-terminated the lines for it).

 

[nem]

or it's because it's being tested outside of the cab without any of the grounding points?

It's this. The bottom floor of the Astro is grounded and both it and the PSU case are metal.