(Topic ID: 237518)

Tech: Fixing modern Stern LED Panels (Stuck Lines)

By wxforecaster

2 years ago


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  • 15 posts
  • 4 Pinsiders participating
  • Latest reply 2 years ago by stangbat
  • Topic is favorited by 2 Pinsiders

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    #1 2 years ago

    I now have 3 stern red LED panels with a couple "stuck on" vertical lines (Star Trek, AC/DC, Metallica).

    These things are not exactly cheap, but it really gives the game a bad look. Is there any way to repair these? Any idea what the cause is? I see this on location all the time too.

    #3 2 years ago

    Actually this is REALLY helpful. Indeed each stuck on line has a single pixel out in the column. Now if I can source the LED squares, I can certainly repair this myself.

    #4 2 years ago

    I have had this problem, and fixed it in the past. The replacement squares I was never able to obtain.... So I salvaged the display squares out of one bad display to fix other ones. That is the route I took, and probably the best plan for you as well if you have multiple bad displays like I did

    #5 2 years ago
    Quoted from ranchero:

    I have had this problem, and fixed it in the past. The replacement squares I was never able to obtain.... So I salvaged the display squares out of one bad display to fix other ones. That is the route I took, and probably the best plan for you as well if you have multiple bad displays like I did

    Ya know, this isn't a horrible idea! Solid bush fix approach.

    #6 2 years ago

    https://pinside.com/pinball/forum/topic/where-to-buy-stern-dmd-8x8-block-for-acdc-display

    I haven't bought any of the blocks I linked to, but I plan on doing so (see Post 34). I'll report back in the other thread once I do and on how they look. Has been low in the priority list lately.

    #7 2 years ago

    Hey Eric, long time no see!! Hope all is well back in KC. Can't believe it's been 5 years since we moved to Pittsburgh!

    Let me know if they match. All of my bad displays are red, but it would be nice to have a source for orange too if some of my older sterns eventually crap out.

    #8 2 years ago
    Quoted from stangbat:

    https://pinside.com/pinball/forum/topic/where-to-buy-stern-dmd-8x8-block-for-acdc-display
    I haven't bought any of the blocks I linked to, but I plan on doing so (see Post 34). I'll report back in the other thread once I do and on how they look. Has been low in the priority list lately.

    Eric, I'm not sure those work?? Aren't those common cathode? http://www.ledist-opto.com/matrix.htm
    The original part number is LA-078811SE1WB which is a 0.7" 8x8, Re at 643nm, 2 Iv, common anode with black face.

    #9 2 years ago
    Quoted from wxforecaster:

    Eric, I'm not sure those work?? Aren't those common cathode? http://www.ledist-opto.com/matrix.htm
    The original part number is LA-078811SE1WB which is a 0.7" 8x8, Re at 643nm, 2 Iv, common anode with black face.

    You're probably right. Marco sells ones reported to be common cathode. That's where I got that info. But I see others say common anode, and the part number you gave matches up with CA. Have you found any CA blocks for sale?

    #10 2 years ago

    If you do some searching using "1.9mm 8x8 common anode" you'll find a few results on eBay and other sites. I guess we need to order and see what works and looks right. If you are going to order, let me know what you get and I might order from a different vendor so that we can compare how they work and if they match.

    #11 2 years ago

    I haven't found anything yet. It might be cheaper to buy a panel with bad lines on them and use 1 as a donor for other panels. I don't think the issue is getting the right size, as much as the right color temperature. It doesn't take more than a few nanometers in wavelength different to notice the color shift.

    That being said...

    ebay.com link: 1pc 8x8 Dot Matrix 1 9mm Red LED Display Common Anode

    These are 640nm which is super close to the 643 listed in the Stern part specs.

    I think SZ410788K is very close and worthy of testing

    #12 2 years ago
    Quoted from wxforecaster:

    I think SZ410788K is very close and worthy of testing

    I ordered 5 (I need 3). <$10 shipped so what the heck, may as well give it a try.

    I wonder if the intensity is more of a concern than the wavelength. They are behind a red piece of Plexiglass on the game anyway, which probably filters it down to a certain wavelength range anyway.

    I'll update on how they look and work.

    #13 2 years ago

    Perhaps. The luminosity of the stock LED segments is 2.0 mcd. The luminosity of the SZ410788K ones is 10 mcd. What I don't know is if 5 times as bright is large or small when dealing with milli-candles of brightness.

    1 week later
    #14 2 years ago

    Update on the blocks I ordered off eBay. It appears that they send common cathode blocks despite the description stating they were common anode.

    The blocks that were sent are marked with "788AS". If you search for "1.9mm 788AS" the results you get are for common cathode parts.

    I've contacted the seller to see if they can send the right part. If not, I guess I'll just get a refund for not as described.

    Edit: Got a reply from the seller. They said it was a shipping mistake and that they'd send the correct common anode parts.

    2 weeks later
    #15 2 years ago

    The replacement blocks were also common cathode. I give up and I'll get a refund. I'll use one of the displays I have as a donor. Not worth messing with this anymore.

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