68kMLA Classic Interface

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Color Classic - No Video
Posted by: Stephen on 2021-01-31 15:04:23
I have a color classic which appears to have a problem with the analog board. Would anyone be willing to offer some advice on where to start?

Debugging so far:

  1. Checked the CRT on another (working) CC and it works fine!
  2. Checked the logic board on the working CC and it works fine!



Symptoms:

  1. When I boot the problematic CC I hear a boot chime but no video, even after waiting a few minutes.
  2. Additionally, I don't hear the "static" / "electrical" sound that normally indicates the CRT is charging.
Posted by: Stephen on 2021-01-31 17:04:14
That was an oddball. This is a Macintosh Color Classic II which I bought "AS-IS" from Japan (Sendico). After some snooping on the analog board I realized someone had attempted the takky mod but wired the wrong pins. I undid the mod and repaired the pins on the slot connector and voila it lives again.

However, now the CRT display is a little dipped in on the top left. I've attempted to correct it with the regular pot adjustors but I think my best option are the adjustment rings on the yoke. Any suggestions before I adjust them?
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