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(Topic ID: 269866)

JP lost world display

By Don44

4 months ago

Topic Stats

  • 12 posts
  • 4 Pinsiders participating
  • Latest reply 4 months ago by Don44
  • No one calls this topic a favorite


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    #1 4 months ago

    When I turn the machine on the display does not come on. It has a new DMD display board and a new power supply. Just making sure everything is hooked up right

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    #2 4 months ago

    Just to make sure all red stripes on the ribbon cables goto the #1 pin. Can you test the display in another game ? And are the fuse(s) on the display power supply good.

    #3 4 months ago

    I checked the fuse and all the ribbon cables. What about the connector on the top right? Is the red wire definitely on the left?

    #4 4 months ago

    Looks right to me.
    If you aren't seeing a "splash" screen at boot that shows the display ROM version, then something is wrong from the dot controller downstream, ribbon, display.

    I know you installed a new power supply, but have you tested DMD voltages?

    Your OEM dot controller has a "reset" pair of pads. You can jump them with a small screwdriver to force a reset of the board. It's possible that your dot controller is never receiving a reset pulse.

    Is the ROM installed with the notch pointing in the same direction as all of the other notches on the board?
    Chris Hibler - CARGPB #31 ... for board repairs - The Place to go for Pinball Repair Info

    #5 4 months ago

    The history when I got it it appeared to have a new rotten-dog Driver board and a CPU that had been worked on. The display power supply appears to be new and the display driver board was missing so I purchased a new one. When I power on the display does not come on and the lights are flashing on and off. The ribbon cables are new and the ROM was installed properly. I was hoping to get the display working first to help me work on the other problem.

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    #6 4 months ago

    Oh. Well...the additional information changes everything.
    The blinking controlled lamps are an indication that the MPU isn't booting.
    From the pic you posted, I can see that the MPU has alkaline corrosion below where the battery holder was.
    The corrosion will need to be properly abated, which means...
    * remove impacted parts
    * sand to bare copper
    * rebuild traces as necessary
    * conformal coat bare copper
    * socket and replace parts as necessary

    That's a $500 board you have there. RD does make a replacement, but as always, the originals are much preferred.
    I'd send that to your preferred board repairman as soon as you can.
    Chris Hibler - CARGPB #31 ... for board repairs - The Place to go for Pinball Repair Info

    #7 4 months ago

    Could problems with the MPU cause the display do not power on?

    #8 4 months ago

    I see that you have a non-factory label on your display ROM, maybe there is a problem with your ROMS? I tried to update the game and display ROMs in my LWJP with images from and had the same symptoms that you describe - blank display and blinking lights. I don't recall my exact troubleshooting and testing but I ended up with the downloaded display ROM 'JP2DSPA.201' and the original CPU and sound ROMs 1.02.

    #9 4 months ago
    Quoted from Don44:

    Could problems with the MPU cause the display do not power on?

    Sure. If the MPU doesn’t boot then it won’t send a reset signal to the dot controller. We have to get the MPU booting first.

    Chris Hibler - CARGPB #31
    Http:// - The new place for pinball repair info

    #10 4 months ago

    Thanks for all the information guys. It looks like I will be sending the board out for repair. I was trying to get the display working so that I could get to other issues and didn't realize the display might not boot at all because of the mpu. I have had some success with minor board repair so that is what I was hoping for but corrosion and rebuilding traces is not my specialty.

    #11 4 months ago

    Thanks for the update, Don. Good luck getting everything up and running and I look forward to hearing that it is all good and playing!

    #12 4 months ago

    I think all the electronics will work once I get that board fixed. When I got it, the playfield was already completely cleaned and rerubbered and all led lighting, new power supply and rottendog driver board, but it was missing the dmd driver board and didn't have any flipper coils or stops and had not been touched for a few years. It was missing the back half of the egg as well but I did get a fair deal on it knowing it was a semi project. I can't wait to finally play it, never played this title before.

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