Hey All,

I'm having an issue with getting the DMD to display/power on my LW3 Pin.

I have replaced the Power Supply, and have dropped in a replacement DMD.

I have since reflowed the headers on the display controller board and have rebuilt the 5v connector going to the controller board.

My voltages to the DMD are:
1-113V
2- -101V
3-Ground
4-Ground
5-5VDC
6-5V
7-12V
8-69V

I was curious does the DMD display make any sound when booting or does it illuminate? I'm unable to get any sign of life from this display.

Any help is appreciated.

Thanks,
John

I reseated both ribbon cables, with no change.

This is my first pin, sorry should have mentioned that.

I replaced the small ribbon cable, with no activity.

I'll try to summarize the conditions of purchase.

I purchased the unit and it was mentioned that it was 100% minus the DMD.

When I got it home, half of the lights on the backbox worked, so I rebuilt the GI connector.

The Power Supply was replaced because the HV section was dead; I also rebuild CN5 on the PS.

Aside from the DMD, I have a hum on the speakers, but see some caps that need attention on the sound card.

the existing DMD display had a crack in the corner and 2 wires that someone tried to patch it with -- The 5v connector was backwards on the controller board and the ribbon cables were backwards.

Concerning the longer cpu ribbon cable -- the red stripe is facing pin 1 on both sides, that's what your mentioning?

Yes, I just double checked -- its correct.

I was thinking the same thing, 5v on ground might be a situation that doesn't pay off to fix the controller board, but rather replace it with a new one.

I thought even without the controller board alive, that the DMD would brighten by power in some way -- is the DMD controller board the only way this thing would illuminate?

Just to add to this a bit -- after starting it up, I notice the IC's do get warm, but not hot.

Yep -- it was an error

Thanks guys -- The game starts, music plays, all lights and flashers work and the game plays normal when a new game is initated.

Unfortunately, I don't know anyone that could test this board locally.

Thanks,
John

might be a good idea, as a backup.

Hey all,

We're progressing a little bit better.

I replaced the DMD controller and finally was able to get something of a display.

Also it should be noted that the cpu rom was corrupt...I've updated to 2.08

It still has a few issues, I ordered replacement ribbon cables but am still having issues with the full screen displaying.

Any help is appreciated.

Here's a video of the current status:

Thanks,
John

It's a fairly new display; odd that it would outgas...

After being on for an hour or so, it doesn't fill...so what you see is whats there from start to finish...it doesn't get better by warming.

I notice, that when the ribbon is moved...it can get worse.

I was thinking of reflowing the header pins on the CPU? It's a new controller, so the header pins should be good there.

The new ribbon cables are coming in on Monday.

I tried to reflow the header pins, no luck as expected.

I don't think it's the ribbon cable, because its getting the data from the CPU, I think you're right about the display.

I think I'm going to have to return it, and get a new one.

The Saga continues lol, good news is it's getting better and better....but i'm kind of at a loss of where to go from here..any help is appreciated.

To update here is what I've done:
New Ribbon Cables (1 Sound, 2 DMD cables)
Re-flowed DMD header pins on CPU Board
All New Fuses
burned eeproms on CPU, and sound board
Verified eeproms on DMD controller board are consistent with the 2.08 version
replaced power supply with new
replaced controller board with new
replaced DMD with new display
rebuilt the 5v ground connector to DMD controller
rebuilt CN1, CN8 connectors on wires

Here's a video of the latest issue:

Line Test:

In game screen:

Thanks,
Jj

Update:

I ran the Data East Test Rom and It seems as if a display PIA could be bad.

Can someone confirm this please?

Flash Chip Location Tested
----- --------------------
1 C5 (ROM checksum)
2 D5 (RAM read/write)
3 5F (PIA1 solenoid read/write $2100)
4 8H (PIA5 switch read/write $3002)
5 11D (PIA2 lamp read/write $2402)
6 11B (PIA3 display2 read/write $2802)
7 9B (PIA4 display1 read/write $2C02)
8 7B (PIA6 sound read/write $3402)

Thanks,
Jj

bump -- any advice on this one?

Thanks,
John