Hey Brian,
I just went thru a similar excursion with my 2467B. Only mine was more fun: I had my 'scope on and the fan seized. I didn't know it and I went out to eat and when I returned, it was stone cold dead. I removed covers and found nothing on J119. PS was dead. I removed the ps card and eventually found a shorted shottky diode. I replaced it and the fan then the ps was working but no CRT activity. I had noticed the upper RHS of board A5 (processor) had corrosion on the mounting screw. Kinda like something caustic had got to it. I Started reading this forum and came across the discussion of failing capacitors on the A5 board. I also noticed that I had a Dallas Semi timekeeper RAM that was over 20 years old. I thought that this one is either getting ready to go bad or already is so I found a new one on DigiKey. I replaced it this time adding a socket to the A5. Still no CRT. Eventually I found a -1.25 reference signal which was developed by the DAC on A5. That signal was around +0.1V. many circuits were dependent on this -1.25 reference. After probing signals on the DAC I concluded the DAC is bad. I ordered in a couple more DACs and replaced the one on A5. No help. I found a flow chart that included setting CRTs grid bias to get an image. I was able to turn it and get the CRT to light up. Out of focus and bright but at least something was there. Still I had no -1.25. J504 is a test jumper that forces circuits downstream of the DAC to be -1.25. When I moved this jumper to the test position, I could re-adjust the CRT bias and see some characters! But things needed to see the DAC working and it wasn't. So, now I started probing analog voltages feeding the reference levels into the DAC. They were correct at the components but clearly wrong on the DAC pins. There were missing connections between surface mounted parts and the DAC! One of those leaky (electrolyte wise) caps was near the resistor network for the reference current into the DAC. I ohm'ed out the DAC pads to the resistors and NO Connections!. The traces looked ok but clearly several were not connected. The solder masking on the board looked ok but the copper underneath was eaten away by capacitor ooze. So new caps, & new 30 gauge blue wire. Finally I have an image and TEST 04 FAIL 02. Time to re-cal. It took me about a day each and about 3 iterations to get it right. Then I had a CT failure and it was a separate cal.
In the end: My scope had SM caps that were ready to die, explosively. My fan quit which probably turned to case into an oven this probably encouraged the caps to squirt out their juice and the shottky to short. The RAM was probably ready to go anyway but replacing it required a re-calibration. I am up and running now: This started just before XMAS.
Many thanks go to Chuck Harris who is also a contributor to this forum. Without his help I probably would have round file'ed this machine.
