68kMLA Classic Interface

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Color classic screen fritz

Posted by: Online persona on 2021-11-11 12:10:00 I won't be surprised if the solution to this problem is so obvious I should have seen it. My Color Classic is acting up. Screen will stay dark, or come in and be darkish blue, or be on with no color. Thumping on the case can fix this. Or not. I'm guessing a bad sodler joint. But where?

Posted by: Nixontheknight on 2021-11-11 16:39:58 try reflowing every solder joint on the analog board. there are a few ways you can go about this, there are reflowing machines you can buy, you could reflow the components manually yourself, or throw the machine into your oven (I don't recommend this one)

Posted by: superjer2000 on 2021-11-11 16:58:10 Try bending (to make better contact) the grounding tabs under the logic board. Cleaning them is a good idea also. I had recapped my cc analog board (lots of caps) and had some colour issues (missing Colors) after and it was those silly grounding tabs.

Posted by: Online persona on 2021-11-11 19:01:34 Do you mean the little spring clip tabs that are on the logic board?

Posted by: Byrd on 2021-11-11 19:38:01 Once reflowed the analog board, focus on next reflowing the yoke board for colour issues/glitching

Posted by: superjer2000 on 2021-11-12 06:46:35 Do you mean the little spring clip tabs that are on the logic board? Now I’m trying to remember whether the tabs are on the logic board or in the chassis. Ultimately it’s whatever needs to be done to ensure a good grounding between logic board and chassis. .

Posted by: Online persona on 2021-11-12 14:18:32 Seems to be a grounding problem the more I mess with it. Reflowed all the logic board connectors, the yoke board on the back of the screen, and the grounds on the plug. Still intermittent screen power. The clips might be the main problem. Should I solder them on the logic board?

Posted by: Online persona on 2021-11-12 15:12:53 Yup, was the clips. I soldered them onto the logic board and all is well.

Posted by: superjer2000 on 2021-11-12 18:32:39 Can you elaborate on how you soldered them to the logic board? Did you reflow the solder on the clips or actually solder them to the chassis somehow?

Posted by: Online persona on 2021-11-12 18:51:49 Sure. I just soldered the little spring clips, there are four of them, directly to the logic board. Normally they are held in place with tension only. It's done the trick and no more screen problems.

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