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Mac SE CRT ghosting/Bleeding to the right

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  • GiGaBiTe
    replied
    The streaking can be caused by several different issues. It could be a problem on the analog board like failing caps, bad solder joints or that the tube is being overdriven. Like if you turn the brightness up too high with the wheel on the bottom left face of the SE.

    If I were you, I'd recap the analog board and redo every solder joint on the analog board. I've had to fix three SE analog boards in the past year and all had problems with failing solder joints. Sometimes the hairline cracks are so small that you can't see them, which is why it's best to just redo all of the joints. Another thing that can cause issues is the adjustment potentiometers getting oxidized and crusty. To fix this, you'll need to mark the position of the potentiometers with a sharpie and then hose them down with contact cleaner and spin them back and forth several times. You'll usually see oxidized junk come out of them, wipe this off and hose them down again until the contact cleaner stays clean.

    If the tube is dark, you can try to bump the voltage to the tube up a tiny bit with the "brightness" potentiometer on the analog board in conjunction with the brightness knob on the face of the machine. Just be VERY conservative with the analog board brightness control because it can damage the tube if turned too high. I wouldn't go more than maybe just the width of a flat blade screwdriver head in either direction, it is very sensitive. Also be sure to use an insulated plastic tool when adjusting these because there's high voltage all over.

    Leave a comment:


  • ivannudem
    replied
    It got much sever if there's a long black line/edge ,the longer the black line is ,the more bright ghosting it has to the right. I uploaded another img in this post.
    You do not have permission to view this gallery.
    This gallery has 1 photos.

    Leave a comment:


  • ivannudem
    started a topic Mac SE CRT ghosting/Bleeding to the right

    Mac SE CRT ghosting/Bleeding to the right

    Hi, everyone,
    I recently bought a vintage Mac SE (with 2 floppy drives) on eBay. But it had a very bad CRT. I mean I could bear the burn-ins, dimmed screen due to less eletrons available due to age, but I encoutered some very bright bleeding/smearning lines to the right of black frames/edges/lines.
    (see attached links)

    I don't know what caused these, because the failure mode of CRT that I expected was that it will dim due to less available eletrons from the electron gun's filaments, but not this kind of non uniform bright bleedings to the right. I hasn't recap the AB yet, but a quick search shows that recap didn't help:https://68kmla.org/forums/topic/6064...-to-the-right/
    also: https://www.reddit.com/r/crtgaming/c...lem_on_my_pvm/

    I would like to know if this is a CRT problem meaning that this CRT is bad (has internal shorts?) or what caused this? I no longer want to invest in this **** thing since I've spent way to much on it.
    Is there a cheap way to repair it without buying a tube (which are hard to find now unless I buy a new SE).

    Thanks a lot.
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