(Topic ID: 125278)

Fixed: TZ DMD shows random pixels


By Warbleboopie

4 years ago



Topic Stats

  • 13 posts
  • 4 Pinsiders participating
  • Latest reply 4 years ago by Big70
  • Topic is favorited by 4 Pinsiders

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#1 4 years ago

I just got a TZ via NAVL and when I plug it in and turn the machine on I just get random pixels on the DMD and the game doesn't do anything. When I press the flipper buttons I see the little lights flicker so I presume "some" boards have good power, but I'm not sure what the specific course of action is here. I took the DMD out and tried to make sure it was attached firmly, and also flipped up the playfield and tried to make sure everything looked cool and no connections had been jostled. Anyone know what's the problem with my machine? Like 20 random pixels in different locations when I turn the machine on.

#2 4 years ago

do you hear a boot chime? do you have 5v?

#3 4 years ago

It sounds like one or more board connections have come loose. Check for missing connectors in the backbox.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#4 4 years ago

no boot chime, I tried looking for missing ones but is there some list I should be walking down of connections? The only wire that's weird is some green one right at the bottom of the backbox but I think it's an extra ground?

#5 4 years ago
Quoted from Warbleboopie:

The only wire that's weird is some green one right at the bottom of the backbox but I think it's an extra ground?

Probably.
What are the three LEDs on the MPU doing? (The lower left rectangular board)
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#6 4 years ago

Sound like you've got a ribbon cable either installed a few pins off or it may have come a bit loose on the connector during shipping. Pull them off and reseat them. Check all the ribbon cable connections too, not just on the CPU.

#7 4 years ago

check the LEDs on the power driver board, are they lit?

again, do you have 5v?

if no chime the sound board is not getting power, either 5v for the logic or the DC for the audio amps... since you have random dots on the DMD it sounds like your DMD board isn't getting power either..

check the 5/12v power connector on the left side of the power driver board next to the CPU board, see if it has come loose

#8 4 years ago

The power driver board has 4 red lights. I don't have a meter. No other boards have lights on in the backbox except for the top right board has one light on.

#9 4 years ago

check LED 4 on your Driver Board. It indicates if you have 5 volts, which is needed to run the CPU. If it's not lit, check Fuse F113 on the Driver board. If that's all good, look at your CPU, which is in the lower left corner. It has 3 LEDs in the upper left. The lower one should be on all the time, also indicating you have 5 volts.

#10 4 years ago
Quoted from Warbleboopie:

The power driver board has 4 red lights. I don't have a meter. No other boards have lights on in the backbox except for the top right board has one light on.

Well, that's the problem. Your MPU is not getting power.
Either the fuse, or the connector to the MPU or from the driver board is not on.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#11 4 years ago

Thanks everyone for all the help, I got big70 from oldies but goodies over to my place and he fixed my issues right up. One fuse, one bridge rectifier and one cap were out, and he took off a board and replaced the connectors for me. Freaking amazing guy, since I have no experience he looked like a miracle worker. Learned a ton, I recommend him for anyone who needs any help in the austin area. I still have one tiny connection to sodder and a coil to replace but the game plays and I am soooo happy. Thank you oldies but goodies!

#12 4 years ago

Thanks for posting the resolution.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://ww.PinWiki.com - The Place to go for Pinball Repair Info

#13 4 years ago

Thanks for the kind words Warbleboopie. Was a pleasure to meet you and your family. So glad we could get you up and running.

BR2 & C5 got replaced and that fixed the 5 volts issue. Was only spitting out 3.3 volts before replacing, for anyone following the thread for the solution.

The connectors were unrelated to the boot issue. Both GI plugs were badly burned and the male connectors were never replaced, causing GI to be out. The fuse blown was also unrelated and was due to a former hack repair to the right flipper.

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