(Topic ID: 279523)

Twilight Zone DMD problem - corrupt ROM?

By adeysolaris

1 year ago


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  • 26 posts
  • 8 Pinsiders participating
  • Latest reply 1 year ago by ChrisHibler
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    #1 1 year ago

    This is a recent purchase with some issues. I replaced all playfield bulbs with LED
    Power mini playfield was dead - tracked down to blown fuses
    Clock works with the exception of one OPTO has failed - will replace that; the bulbs replaced by LED

    There has always been intermittent lost lines on the DMD and very slow to update, so I replaced both leads. The DMD driver is a new looking XPin.
    The new leads have not resolved the problem, in fact things have worsened as the pictures will show, the animations occasionally do play but they are soon frozen when they do

    Sound and everything works fine

    I have no other machines I can swop out parts with to test them

    20201013_220744 (resized).jpg20201013_220909 (resized).jpg20201013_221413 (resized).jpg20201013_221702 (resized).jpg
    #3 1 year ago

    Display test threw up a load of paging errors...

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    #7 1 year ago

    The ribbon cables are new but the fault persists - so I am guessing the cable headers maybe a loose solder joint?

    #12 1 year ago

    I took the CPU board out - took photos and gave it a clean with a brush. It looks in very good condition.
    20201016_112033 (resized).jpg

    20201016_112055 (resized).jpg
    Problem with the RAM seems to make sense, I don't see how a faulty ribbon cable would lead to a report of a RAM error in the Test utility...?
    Now
    I am assuming the RAM chip is this one (number 2)
    CPU board (resized).jpg

    #18 1 year ago

    The DMD controller is X pin
    someone from X Pin read my post and showed me how to run a diagnostic of their controller - which brought up the DMD working perfectly
    So I think we can discount the dot matrix controller (unless the ribbon socket has a problem?)
    Also I am in the UK so sending to the States (well - I am not against it) but I seem to recall that I still have to pay duty on these items incoming

    #19 1 year ago

    Okay here is what I gather from the feedback (thanks to everyone so far)

    I need an (AnyPin) NVRAM anyway, to avoid the risk of leaking batteries
    and it may solve the problem if it is the RAM chip on the processing board

    #23 1 year ago

    Fault located. something was wrong between the IDC header and the logic in the DMD board. I found slight pressure on the board caused the problem to disappear - it is a weird one - maybe weak traces or solder

    1 week later
    #25 1 year ago

    Thank you Chris - I will need to find someone in the UK to do that job - can you recommend anyone?

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