Reseat connectors on the other boards, mpu. Had same issue on my TZ.

Hi and welcome to here and pinball! Check and reseat all the ribbon cables and make sure there no are misaligned or bent pins.

STNG is a great game so you're off to a great start. Happy thanksgiving!

(Just repeating what everyone else has already said, in more detail...)
First thing I'd guess when seeing this is issues with the DMD controller. Reseating the connectors is a good idea, concentrating on everything attached to the DMD controller. That's the board at the other end of the cable that goes to the display itself, right of center board in the top row in the backbox. There's a couple of ribbon cables connected to it - reseat all the connectors on those, and also all other connectors plugged into the DMD controller board (the large connectors near the bottom of the board).

Swap the DMD Controller Board from your IJ or your Dr. Who into the game.
Doing so will indict or eliminate the DMD controller. If it's not a ribbon, it's likely the RAM on the dot controller board.
Just conjecture right now...
http://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Failed_RAM
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Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

Yes. F112 blown means no power to Fliptronic-board and no power to rectifier Br3 on PDB = no 50Volt supply for solenoids.

That pinwiki page is nice. I have never seen that before. I have a problem where any static page that is loaded to be displayed has "bad" pixels in it. Every time a new page is loaded the bad pixels are different, so it isn't my brand new display. Something is corrupting the data and then it is constantly refreshed by the display controller with the same bad pixels stuck as they are.

I have scoped out the board but with only two channels I can't find the problem, probably need a logic analyzer. I am going to swap the RAM and see what happens. I happen to have 32kx8 RAM chips that I have been saving for 20 years and today I am going to use one!

Awesome! Let us know how that turns out.
The largest failure on Dot Controllers is the high voltage section.
A long way behind the HV section in failure rate is the RAM.
A long way behind RAM is the other 74XX logic on the board (fortunately).
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Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

Didn't help. I already installed one of the 5v only Vishay Red LED displays so I took out both fuses to disable the HV section. I am done poking around this board, I ordered an Xpin controller board. I just hope this solves the problem. A few of the address lines coming from the CPU board looks pathetic so I replaced U1, a 74LS244 buffer driver. The output looks better but still didn't solve the problem.

It seems as if something is getting double clocked sometimes and I will get every other row lit up. At other times all rows are working but show random bad pixels.

Anyway fingers crossed on the Xpin board solving the problem. I don't want to hi-jack this thread.

I'd love to see a YT video of the behavior.
I have one that would put random dots up. There was never a pattern. I've yet to figure that one out.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info