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(Topic ID: 214681)

LAH DMD


By drewbo81

2 years ago



Topic Stats

  • 30 posts
  • 5 Pinsiders participating
  • Latest reply 2 years ago by PinballManiac40
  • Topic is favorited by 2 Pinsiders

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    There have been 7 images uploaded to this topic. (View topic image gallery).

    LAH (resized).jpg
    255C1D87-10DD-48A8-9EDE-53CA4AFA2104 (resized).jpeg
    C9F57B0B-7BB9-4DB8-A413-484C3A9C646D (resized).jpeg
    7BB07DCE-2C24-49B5-887E-A7B934109738 (resized).jpeg
    81C699FE-8290-4141-9071-5985EB2309FC (resized).jpeg
    2018-04-14 23_44_28-File_TestingDMDVoltagesAtTheDMDConnector.jpg - PinWiki - Internet Explorer (resized).png
    2018-04-14 23_45_15-Data East_Sega - PinWiki - Internet Explorer (resized).png

    #1 2 years ago

    LAH DMD no display. Game plays blind all sounds and lights work just no dot matrix display.
    I checked all voltages to driver board and they are all correct. Fuses are all fine ribbon cables seated etc...
    Do these things really just “gas out” like I read about or am I missing something?

    #2 2 years ago

    if you have absolutely nothing, its prob not gassed. usually its gradual and gets distorted. if yours is completely blank, id say prob a power supply issue on yours.

    #3 2 years ago

    every data east and sega ive owned, its been a power supply issue, i think im at 6 or 7 now! no kidding!

    #4 2 years ago

    You actually need to test the voltages at the DMD power connector. -112, -100v and 68v are very important for the DMD to work.

    http://www.pinwiki.com/wiki/index.php?title=Data_East/Sega#Testing_DMD_HV_Power

    #5 2 years ago

    You can buy the LED ColorDMD now for JP, as it would include everything you need for it to work and fit into LAH and you would not have to worry about the High Voltage on your power supply as it would not be needed. Then you only would need to wait for it to have the color ROM file updated, hopefully this year, and you would have a full color display. I am looking forward to this title having full color.

    http://shop.colordmd.com/led-replacement-display-for-jurassic-park-pinball-machine/

    #6 2 years ago

    When you say at the power connector do you mean at power supply board pins or connector for driver board. I checked driver board end. Sorry I’m a newbie at this.

    #7 2 years ago

    Also thanx for idea about JP color dmd as I was going to upgrade when it did come out anyways.

    #8 2 years ago

    power supply board.

    #9 2 years ago
    Quoted from drewbo81:

    When you say at the power connector do you mean at power supply board pins or connector for driver board. I checked driver board end. Sorry I’m a newbie at this.

    There are 2 power connections for the DMD. There is power to the driver board (5v) at CN2 on a small plug, and power to the actual plasma display which has the voltages mentioned above on a 8 pin plug.

    #10 2 years ago

    I do mean on the power connector of the DMD, just as it showed in the link on post.4. This is going to the best location for the voltages as it has to go through 2 connectors from the power supply to reach the DMD. It would be good to wedge the black meter lead between the ground braided wire and the wood of the backbox so you don't have to worry about holding both meter leads. Pin 1 is on the left looking at the power connector as you see it in the picture.

    2018-04-14 23_44_28-File_TestingDMDVoltagesAtTheDMDConnector.jpg - PinWiki - Internet Explorer (resized).png
    2018-04-14 23_45_15-Data East_Sega - PinWiki - Internet Explorer (resized).png

    #11 2 years ago

    pinballmaniac40
    Thanx for all the help. All the voltages check out. Any idea what next step in diagnosing problem would be?

    #12 2 years ago

    My JP ended up needing a new CPU board. I tried a rottendog dmd controller but that did not help so I found a cpu board, swapped it and the dmd started to work.

    #13 2 years ago
    Quoted from drewbo81:

    pinballmaniac40
    Thanx for all the help. All the voltages check out. Any idea what next step in diagnosing problem would be?

    Did the DMD ever work for you? Can you post a picture of the boards and the back of the speaker panel (with the DMD controller) with the game on please? So many other possibilities being MPU, ribbon cable, DMD, or even the DMD controller board.

    Also do you have access to a friend's DE machine to be able to start with testing the DMD controller and DMD?

    #14 2 years ago

    Yes it was working fine. I did just Upgrade the main cpu game rom and that is when it happened but not sure what one has to do with the other.
    I will have access to a spare dmd next week and will send some pics later when I get home.
    I appreciate all of your time and effort.

    #15 2 years ago

    In that case, I guess it is possible a ribbon cable somewhere is half way out. May even try to reseat all the ribbon cable connections. If that does not help, try gently wiggling the ribbon cable to see if that has an affect on the DMD.

    Also, possible the display ROM on the DMD controller board may not match up with the new game ROM. May go back and try the old game ROM again to see what happens. What version is the old game ROM, new game ROM and Display ROM?

    #16 2 years ago

    New display rom is 1.06
    Original was 1.04
    New game rom is mod 1.13 old was 1.08 I believe.
    I already swapped back to original roms just to be sure to no avail.
    I will try ribbon cables tonight and report back.

    #17 2 years ago

    Any chance you had installed the display ROM backwards and applied power? If so, likely would had killed the display ROM.

    #18 2 years ago

    No indent lined up with indent. I learned my lesson years ago with arcades

    #19 2 years ago

    Here is pics of dmd board speaker box etc
    Are there different dip settings for different roms?

    81C699FE-8290-4141-9071-5985EB2309FC (resized).jpeg

    7BB07DCE-2C24-49B5-887E-A7B934109738 (resized).jpeg

    #20 2 years ago

    C9F57B0B-7BB9-4DB8-A413-484C3A9C646D (resized).jpeg

    #21 2 years ago

    Move your display ROM over to the ROM 0 location since it is marked as 'Disp 0'.

    #23 2 years ago

    Then I would try the old display ROM in ROM 0 to see what that gets you.

    #24 2 years ago

    I tried that and nothing then it appeared braided ground was loose...ah ha!
    pinballmaniac40
    Thank you again for all the help. I am enjoying the learning process

    Drew

    #25 2 years ago

    Awesome. As I mentioned, many...many possibilities for a failure sometimes. That one was not even on my mind. Time to get ready for that LED ColorDMD.

    #26 2 years ago

    Let's see a picture of the working DMD.

    #27 2 years ago

    Can’t wait for that color dmd...

    255C1D87-10DD-48A8-9EDE-53CA4AFA2104 (resized).jpeg

    #28 2 years ago

    One last thing...any thoughts on lcd vs led color dmd for mid 90s games

    #29 2 years ago

    Well, for LAH, the LED will only be the publically supported display by ColorDMD because of the speaker panel. If you are willing to modify the speaker panel a bit, the LCD will fit, but it may block an inch of light at the bottom of the translite as it would stick up pretty high in the backbox. Also, the LCD will sit pretty far back so you'll have to add something on both left and right side of the display to block the light from inside the backbox. If you do modify it for the LCD, you will have to get the color ROM from ColorDMD as it would be supplied as needed. I do prefer the LCD, but I'll likely go with the LED in my JP once I get my project game working. It is a ways off right now.

    2 months later
    #30 2 years ago

    After 4 years, I finally got my LAH set up so I can start working on a MPU board for it. Since my game is missing a DMD, I just ordered the JP LED ColorDMD for it in hopes full color will get supported for this game this year. If nothing else, I can choose what color the display will be until that time comes. I'm thinking yellow or light blue would look pretty nice in this game. LAH (resized).jpg

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