Greetings,

I'm running a Videogame Bar in a small town in Czechia and also started implementing Pinballs.

Last week I got a HSII (second revision I think), after an overhaul where they mainly did cosmetic stuff and changed the DMCB.
First few days it was running nicely just the shifter would intermittently stop working shifting up so I just check the solderpoints and reconnected the plug which fixed it.

(Aside from that he was just giving me a "switch 64 ramp" error but the ramp worked correctly)

Yesterday we brought our Space Station from servicing and after just 6 games (where both machines were connected to the same power outlet) the HSII just showed a scrambled mess on the DMD.
The game itself works correctly just the display is showing those "flames" (could upload a video of it aswell)

So I checked online while printing out the manual.

What I tried:
Reseated the flex/ribbon cables
Flipped them once to see if would change anything
Checked all fuses (once after reseating the ribbon cable F112 blew but after reseating not anymore)
LEDs checking out
Visual inspection for any blown/burnt stuff

Since the display is "showing" something and changing I guess data is coming through but the HC-voltages may be off?
Gonna measure it in like and hour but would like to know if anyone would have any input aside from buying a Color-DMD to cut out the Hc-circuit.

Thanks
Benjamin

IMG-20220117-WA0001 (resized).jpeg

ezgif-2-a63d1c4162 (resized).png

So just finished measuring voltages from the DMD to the DMBC and then from DMBC to the main plug before the powerplant and it seems that 80VAC and 100VAC (white and purple cables) are mostly dead.

Picture description:
1st: -125v
2nd: -112v
3rd: 62v
4th: 80VAC
5th: 100VAC
6th: main plug

So any advice aside from trying a different power plant?

Regards

20220118_200913 (resized).jpg

20220118_200922 (resized).jpg

20220118_200939 (resized).jpg

20220118_202607 (resized).jpg

20220118_204334 (resized).jpg

IMG-20220118-WA0005 (resized).jpeg

Ok did it via ur tutorial and got:
At the main plug (in cabinet)
105VAC on purple 100VAC rail
83.5VAC on White 80VAC rail

At DMCB i get:
8VAC for Purple 100VAC
7VAC for white 80VAC

Edit:
For the VDC rails (the ones to the DMDB i get mV or 0.00VDC!

So there is a problem on the way from the main plug inside the cabinet to the DMCB I guess?

And how may I be able to fix it?

Jep not getting those the input voltage to the DMCB is already wrong!

Jep, that's true redid it via the tutorial that was posted in this thread and found out that the DMCB is not getting the 100 and 80 VAC!

Jep checked back with my electronics guy said the same and that i should try another multimeter which I did and I think I got the problem:

62v is 58v

12v is 12.5v
5v is 4.9v

-98/-100 is ~-107v
-110/-112 is ~-128v

I guess the last 2 ones are the culprit so pulling out the board now.

20220119_130103 (resized).jpg

20220119_130129 (resized).jpg

20220119_130136 (resized).jpg

20220119_130201 (resized).jpg

20220119_130206 (resized).jpg

I guess I found the culprit?
Any way to measure what connection/resistor is bad?

20220119_131916 (resized).jpg

Jep figured as much from all the tutorials i scooped up ^^.
Talked to my guy and he is gonna do the rebuild most likely tomorrow after work so fingers crossed for it being up and running Friday evening.

And just for additional input:
Wouldn't it be better to just install a color dmd or LCD display and cut out the whole high voltage circuit to the DMBC?

Any other easy add-ons i could get at the same time?

Jep - je - ja (yes in German) ^^
and thank you hope i will get versed enough in board repair so I can do everything by myself

Just a quick update:

Brought my:

DMD + Board
DMCB
Fliptronic II
All data cables

To my flipperguy, he plugged it all in his ST:TNG machine and everything worked flawlessly.
He tested it for 20-40 minutes took some measurements to see if he gets the same HV readings(which he did) but to be on the safe side he gave me the fliptronic and DMCB out of his machine and new datacables.

Picked it up drove to my place plugged it all in and after cca 3 seconds the display came to life.

People were playing for like 90-120minutes straight and there was the same error again, a quick restart fixed it but only for another 30 minutes -> flames!
After opening the backbox and inspecting the boards visually it fixed itself one last time without me touching anyhthing but after just 2 additional games it got stuck in the same flame/cloud effect + animations as before.

What I tried yesterday/today was:
Did a display test before it crapped itself which passed
Reseating and flipping all data cables
Measured VAC input to DMCB (83.5 and 105 as before)
Measured VDC Output to display (65, -97, -122 doesn't matter if the display is showing the game correctly or the flames)

So since even my guy is completely out of clues he is gonna give me another DMD (which is more degraded some rows already going out)
And another CPU board + another game rom just for testing.

In my desperation I'm trying to replicate the only thing that seems to be connecting the last few events:
The boards + display being unplugged (and transported) in colder temperature for atleast 2-4 hours.
Gonna give and update soon

(Last resort is still the LED/LCD display)

So I guess the last update before I get the colordmd:

Drove for the new CPU and degraded DMD display.
After installation and first install it wouldn't hold the memory.
So i checked the Voltages and ofc there was something off.
Resoldered the battery tray and it worked for the some test games.

Today the bar is gonna be open so let's see it it will all work in a proper stress test.

Thank you guys for all the input.