(Topic ID: 296905)

Data East Star Wars - DMD Woes. Can not get any display

By SteveCT

1 year ago



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  • 4 posts
  • 3 Pinsiders participating
  • Latest reply 10 months ago by Dmod
  • No one calls this topic a favorite

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#1 1 year ago

Hello,

I have been working on a DE Star Wars. No DMD. I replaced with a fully working and tested DMD, I replaced the DMD driver with a new one. I also replaced the power board with a new one. Finally, I replaced the ROM chips with a brand new matching set, one on the dmd driver, and the other on the CPU. NO ACTION! I tested continuity on all wires, checked solder points on all connectors. No action! The game plays, just no DMD. Throughout the troubleshooting process, I re-tested the DMD and driver on a DE Lethal weapon, and works fine. I gave up and the game has been sitting. Any advice!?

#2 1 year ago

Check connector CN2 on video board.

https://www.pinwiki.com/wiki/index.php?title=Data_East/Sega#Dot_Matrix_Issues

Check voltages at display. *HIGH VOLTAGE* If you're not comfortable using a meter, find someone who is.

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

2 months later
#3 10 months ago

Thanks phishrace
I have some updates... but still no solution!
Cross tested the following in another DE cab:
- DMD - good
- 2X Ribbon cables - good
- DMD Driver - good
- all voltages to all connectors measure fine from the power supply
- grounding straps in place

Here is what I am uncertain of:
- Are the new ROMS I installed on the driver and the CPU good?
- Is there an issue with my CPU?

I attached a couple photos. I have the old ROMs but not sure of the original positioning.

IMG_4182 (resized).jpgIMG_4183 (resized).jpg
#4 10 months ago

With the 26-pin ribbon cable (that comes from the CPU to the display board) disconnected, the display board should show a splash screen that shows the display ROM version at power up. If you're not getting the splash screen, there's a problem with the display board or the DMD.

After power up, the display board will idle without displaying anything until it receives a command from the CPU over the 26-pin ribbon cable.

If you see the splash screen, but nothing after that, the problem is with the communication between the CPU and the display board.

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