68kMLA Classic Interface

This is a version of the 68kMLA forums for viewing on your favorite old mac. Visitors on modern platforms may prefer the main site.

Click here to select a new forum.
Color Classic ticking noise - flyback?
Posted by: JC8080 on 2023-11-26 15:18:59 I recently got my Color Classic working thanks to a new logic board from @defor. The machine was working fine, though it was making a whining noise. It was not a mechanical whine, there was no HD in the machine and it was not a bearing whine coming from the fan. I put the machine away for a couple days and took it out again today. Now when I turn it on it makes a ticking noise and the video is distorted, it seems unable to sync. The logic board seems to be working fine, I get the startup chime and then a grey screen with a cursor that moves. I did not have any drive hooked up so it would not be expected to boot. The ticking is definitely not coming from the speaker, I can feel each tick if I am touching the CRT, almost like a faint tapping though I am sure it is not actually anything mechanical hitting the screen. I recapped the analog board a couple weeks ago, I was very diligent checking for solder bridges and bad traces, I fixed a couple dodgy looking traces. The fact this seems to have started with a whine and then turned into this ticking noise makes me think it is flyback related, but I welcome people's thoughts. Edit: the video shows some of the normal video issues you expect when taking a video of the CRT, the darkening and lightening is a result of this. Aside from the darkening, the image you see is pretty close to what you see in real life.
Posted by: JC8080 on 2023-11-26 19:01:42 Problem solved, the wire from the flyback to the CRT had popped out. It doesn't seem to clip in as securely as on the 9" Macs so I must not have seated it properly. Thanks for the suggestion @defor.
Posted by: defor on 2023-11-26 19:01:58 yay!
1