The Simpsons Pinball Party
Stern, 2003You're currently viewing posts by Pinsider Dmod.
Click here to go back to viewing the entire thread.
Did you swap the Whitestar DMD controller boards between the two games? Those are the boards mounted to the rear of the displays.
If you were testing with the old plasma DMD, did you try swapping the high-voltage power supply boards?
Power driver board seems unlikely to be the problem, but the way to check would be to test for proper voltages at the Whitestar display board and at the DMD.
If you were pulling display ROMs in/out of the Whitestar display board, I'd be more suspicious of damage to the socket or TSPP display ROM chip.
Just to verify... have you done this test?
(1) Set the LOTR back to the way it was with all original boards.
(2) Swap ONLY the Whitestar display board between games AND (necessarily) swap the display ROM chips between the two boards so the right display chip is in the right game.
I'm still unclear on what tests were done. Looking at the TSPP backbox, there are only four boards:
(1) large CPU board at top-right
(2) large power driver board at bottom-right
(3) DMD High-Voltage power board at top left
(4) DMD display controller board mounted to back of the DMD
There's also the actual DMD that is underneath the metal RF shield.
The CPU and display controller board both contain ROMs that need to be replaced when swapping boards. Also the game ROM and display ROM versions also have to be consistent to work properly.
If you can be more specific as to exactly what and how the board swaps were done, it would be helpful to debugging the issue.
Quoted from Djshakes:Correct, the LOTR doesn't work in the TSPP. Nothing works in the TSPP. Everything I swapped from TSPP works in LOTR.
These readings are for a WPC display but wouldn't they be the same for a TSPP using a high voltage display?
Pin 1: -125 volts (-110 to -130 volts); Williams lowered this voltage to -115.
Pin 2: -113 volts (-98 to -118 volts); Williams lowered this voltage to -103.
Pin 3: Key
Pin 4: Ground
Pin 5: Ground
Pin 6: +5 volts (4.9 to 5.2 volts)
Pin 7: +12 volts (10 to 14 volts)
Pin 8: +62 volts (58 to 68 volts)
Voltages look good. I'd suspect the TSPP display ROM (or the Whitestar display board... but you already stated this is working with the LOTR display ROM installed).
You're currently viewing posts by Pinsider Dmod.
Click here to go back to viewing the entire thread.
Wanna join the discussion? Please sign in to reply to this topic.
Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!
This page was printed from https://pinside.com/pinball/forum/topic/tspp-display-issues-totally-perplexed?tu=Dmod and we tried optimising it for printing. Some page elements may have been deliberately hidden.
Scan the QR code on the left to jump to the URL this document was printed from.
San Clemente, CA