(Topic ID: 228349)

Seeking schematics for Stern (red) LED DMD

By soren

2 years ago

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  • 16 posts
  • 6 Pinsiders participating
  • Latest reply 9 months ago by soren
  • Topic is favorited by 2 Pinsiders


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    520-5052-05 Page 4.pdf (PDF preview)
    520-5052-05 Page 3.pdf (PDF preview)
    520-5052-05 Page 2.pdf (PDF preview)
    520-5052-05 Page 1.pdf (PDF preview)
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    #1 2 years ago

    Can anyone help with schematics of the LED DMD by Stern. Type 520-5052-05.

    9 months later
    #3 1 year ago

    Did you check to see if it is in your game manual?

    #4 1 year ago

    It is not. Because the red LED displays was a Euro only substitute for the plasma displays.

    But now you mention it. They were later replaced by orange displays. And they maybe became standard for all markets. And maybe they were added to the manual. And maybe it is the same design (components). The build quality on the early red ones is shit.

    #5 1 year ago

    What game is it in?

    The red LED display came standard in GOT, GB and WWE for worldwide shipping, not just for overseas. I do not have any of those games, so I don't have a user manual to look to see if any of those have a schematic.

    #6 1 year ago

    I have read that someone found transistors that shorted and locked on columns of dots. You can test those across the top of row of transistors to see if that is the case. Stern may give you a part number if you call them or email them, if it is not listed in the manual, or they may sell them to you. Though, being overseas, not sure if a distributor could also help with tracking down parts/numbers.

    #7 1 year ago

    An entire row of dots is out. And it is likely that "8550" transistor from my troubleshooting. It is just bloddy frustrating to not have the schematics for this. Besides I struggle to find the exact "8550" type of this.

    Have looked at dozens of Stern manuals. And there is no documentation of this. It is like the display was just a minor component used in the game. Slobby.

    pasted_image (resized).png

    #8 1 year ago

    Try an internet search for S8550 SMD transistor. What is 'local' for me, may not be for you overseas.

    #9 1 year ago

    looks like S8550 PNP TRANSISTOR SOT-23?

    PNP/NPN is very important, don't get wrong type

    9 months later
    #10 1 year ago


    3 months later
    #11 11 months ago

    I reached out to support recently for my own issue and was sent these.

    I hope I'm not stepping on any toes but there isn't any writing on the schematics or the email to say that I shouldn't share them. So hopefully these can help others down the road as well.

    520-5052-05 Page 1.pdf520-5052-05 Page 2.pdf520-5052-05 Page 3.pdf520-5052-05 Page 4.pdf
    #12 11 months ago

    soren onlydjz
    I hope the post above is still helpful to you.

    #13 11 months ago
    Quoted from Jahkub:

    soren onlydjz
    I hope the post above is still helpful to you.

    Very good. Thank you!

    #14 11 months ago

    But nowhere on that schematic do I see S8550 transistors. All I see are mosfets.

    #15 11 months ago
    Quoted from KenLayton:

    But nowhere on that schematic do I see S8550 transistors. All I see are mosfets.

    I guessing the original post was from the time that stern used pindmd boards in their euro games. I think stern started manufacturing their own soon after.

    1 month later
    #16 9 months ago

    Thanks a lot for sharing. Though this looks like a later revision than what I have in Spidey.

    I was able to fix mine using a through hole transistor!! As per the previous hint. Not a FET.

    Hey there! Got a moment?

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