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Thread: Sega New Astro City- CRT PCB issue (brightness)

  1. #1
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    Sega New Astro City- CRT PCB issue (brightness)

    Toshiba CRT brightness switches between bright and darker, apparently linked to the control PCB located in the control panel. Affected by vibration e.g. when I slam down panel (I think the small brightness pot on the PCB which had been pressed down onto PCB by frustrated previous owner presumably).

    I checked for cold solder joints, and re-soldered brightness pot. Problem still present, I think due to faulty pot (you can see from one photo that it is cracked).

    I can't find anywhere to get a replacement brightness pot or even the PCB. Does anyone know where to get these?? See photos.

    Thanks guys!

    IMG_8333.JPGIMG_8334.JPGIMG_8335.JPGIMG_8336.JPGIMG_8337.JPG
    Last edited by Pinball; 03-20-2017 at 04:46 PM.

  2. #2
    The Chinese Kid Kid Panda's Avatar
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    Have you jiggled the ribbon cable when it's plugged in? I had the same problem with one of mine a couple of years ago and it ended up beign the ribbon cable.

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    I did and there is no obvious cause in the cables or components i.e. nothing happens. I should probably replace the cable/connector and control panel PCB, but cannot find anywhere that sells them. If anyone could provide a seller for these it would be awesome, as currently the cab is fcked.

  4. #4
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    I had this same issue, I switched out the pcb board and immediately fixed it. I want to say mine was isolated to the pot as if I put pressure on it I could trigger the problem. I also tried reflowing but it did not resolve the issue. If you can find a rating on the potentiometer you should be able to find a compatible replacement.

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    I've read that a good servicing of the faulty pot with deoxit can restore it.

    Desolder pot. Clean with deoxit. Resolder pot.

    I haven't personally tried this method, but it might be worth a shot if no other options are panning out.

    Sent from my SM-G900V using Tapatalk

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    Quote Originally Posted by NoAffinity View Post
    I've read that a good servicing of the faulty pot with deoxit can restore it.

    Desolder pot. Clean with deoxit. Resolder pot.

    I haven't personally tried this method, but it might be worth a shot if no other options are panning out.

    Sent from my SM-G900V using Tapatalk
    I tried this today with some contact cleaner spray... and it worked! Sprayed the whole board and under components.

    Brightness stays bright now, after several hours of solid play. I didn't even desolder first. I should have thought of this earlier- cheers :-)

    Pretty impressive how long these 1994 devices have lasted, really.

  7. #7
    The Chinese Kid Kid Panda's Avatar
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    Good deal.

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    Nice! I love those simple fixes (aka inexpensive fixes).

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    Quote Originally Posted by NoAffinity View Post
    Nice! I love those simple fixes (aka inexpensive fixes).
    Definitely! In addition, the connector was loose on the Toshiba monitor PCB- re-seating connectors always worth doing. It's still working perfectly now.

    Next change is to upgrade speakers (awaited from Australia) :-)

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