This really isn't a diagnostic step, it's more of a "This thing has 30+ years of dirt on it and I'm going to look like I'm covered in soot by time I'm done" issue.

 

So I took the monitor outside (after Discharging it), sprayed it down with Simply Green and  a garden hose.

 

WARNING: There is a risk of the Aquadag coming off.  If too much of it comes off you'll need to repair the tube.   See this KLOV thread: http://forums.arcade-museum.com/showthread.php?t=273536&highlight=aquadag for more details on the dangers and how to fix it.

After rebuilding the chassis, I noticed some cracks in the fly back.  This isn't a good thing for a couple of reasons.

 

1) They don't make a replacement for it.

 

2) It could leak high voltage (a bad thing). 

So how do you fix it?  Well, you get something like Super Corona Dope, which is a high voltage sealant.  I picked up a bottom from the local Frys Electronics that will probably last me the rest of my life.

 

It smells a lot like fingernail polish, and is applied the same way...

 

I applied a couple of coats as the first couple of coats filled in the crack and air bubbles came out.  I wanted to make sure it was completely sealed. 

 

I'm going to let it dry over night, then we'll hook it up and see if we get any fireworks... hopefully not.