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Charadis

Help fixing Color Classic ii with no video (my fault, I guess)

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Recently imported a couple of CC ii, they both worked initially. The second one I acquired started right up, but had a "sparking" sound every time it was booted, and every time it shut down (CRT off). I noticed the fan was not working, and the back casing was not flush against the front casing.

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I took the back off and fitted it flush with the front, screwed it back down. Fan worked, and initially, there was that "sparking sound" but no video. 

 

Took it apart again, and this time I noticed that the grounding harness was loose, and detached from the left side bracket. Reinstalled it correctly, grounding cable now against the Trinitron snugly, and reassembled everything as it should. Powered on, no more sparking sound, but no more video, either. System would bong at startup though, and I could hear floppy drive loading the Disk Tools, but nothing shows up on screen, and I don't hear the screen being energized. Removed back, CRT doesn't seem like it's even getting any power. 

 

Reading service manual, it mentions that not properly reinstalling the ground harness/cable could damage component/s. Which I figure I probably did. Meh. But I can't, for the life of me, figure out which component/s has been affected. I've looked all over this board, tested a few components for continuity. I'm stumped. 

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Swapped out the analog board from the other CC ii, and the tube/system comes to life. Hazaaaa, the tube is okay!

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Just the analog board. Grrr. Sooooooo I guess I traded working fan for video...not the best trade ever, I admit :tongue:  

 

Now, I just gotta figure out how to fix the original analog board, because the picture with this other one is not aligned nicely even after I've adjusted the pots in the back (and I'd prefer to have two working CC ii's). Any advice or suggestions/leads that I could try out would be greatly appreciated. 

 

I've thought of swapping the flyback transformer, swapping the video board, swapping the....that's pretty much it, actually. Couldn't find any individual components that looked suspicious/damaged, so falling back against my own, I've decided to turn to any experts here who could help me out, please! 

 

Cheers, 

 

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