Hi everyone,
I'm new to pinside, and pretty green to pinball ownership. I have a Cybernaut pin, and I recently went through and changed all the non-working bulbs. I was able to get all the lights to work, minus the big "S" in the middle of the playfield. I tried several bulbs and several sockets, but nothing worked, so I'm guessing its the trace on the board, the wiring, or something on the board in the backbox. All the other letters in blast work. I was just wondering if someone on here could point me in the right direction of what to check / try next. I included some pics of the board all the bulbs are connected to under the playfield. It appears someone has done some repairs before I owned it, though the trace for the letter S looks ok in my opinion, though maybe I'm missing something. I can take more pics of whatever is needed. I live in the middle of nowhere, so getting someone else to look at it isn't really an option. I would prefer to use this as a learning experience anyway too.
Thanks in advance for any help you might be able to offer!

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Thanks for the quick reply, I appreciate it. I will try to read the schematics and figure out which transistor is responsible for that particular bulb.

I found the pin on the board for the “s”, but still need to trace the correct transistor for it.

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Thanks!

So I found two q7’s. I’m 99% sure it’s the board in the first pic, as the transistor # matches up to what was said above. But I want to make sure, as I’m pulling the board and driving it 4 hours round trip, and would hate to take the wrong one lol. It’s this one correct?
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And not this one, correct?
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Thanks

Thanks again Atari_Daze. I was 99% sure I had the right board as it is labeled Aux Lamp Driver, but I couldn't find any spot on it that said A9. So just wanted to double check. Thanks again for your help and time!

Update:
We soldered a new q7 transistor on, but the s still does not light up. I reread the schematics, and q7 on the a9 board is definitely correct. So I’m just wondering now what might be good to check next, if anyone has any tips. Thanks!

Thanks for the info and the link. I will definitely give the boards and connectors a good look over.
Also, your silverball thread is a fun, inspirational read. It was one of the threads I read when I was lurking before I made an account.

I just got around to taking some pics of both board a9, as well as the board that the s bulb sits on. I can’t really see any cracks or faults in the traces, but wanted to post it here as you guys will have a better eye for this kind of thing. See anything that might be the culprit?

Q7
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The one most in the middle
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Bottom row, 2nd to the right
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The one on the left
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You can see the previous owner jumped the one trace to wire in the last pic. Though the wire and connection for the s light looked ok to me.

Hey! Thanks for the info above. I tested the grounded wire against the transistor, and got nothing. But I tested it against the s ground, and it lit up. When I grounded the s off of the t ground, it blinked in the pattern it should.
So this is great, as it shows us the problem, correct? Do I need to follow the ground trace on the s light board now? Or what’s the best way to fix it?
Thanks again for your help

Thanks again.
I attempted to try this, but got a bit confused. I couldn’t see a red wire that clearly had a green accent line. Playing around with the a9 board, I was able to get the s light lit, though it was off a few different spots. The wire connection on the light board under the playfield didn’t light the s when jumped, though probably by my error more than anything. I had one end of the wire on the s ground, and the other end in the pin connector. Is that correct? I also took closer pics of the pin connectors, in case anything looked odd.
Thanks again for helping a noob out.

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Also, to me it looks like the trace for the "s" light leads to the black wire in the last pic. The "s" light trace is the 5th down from the top.

With my a9 board being technically upside down, if the black wire is replacing the red-green wire, then it should be one spot higher to make it the #11 spot on the a9 wire connector, correct? I noticed that it was loose when i slipped the black cover off, and put it back where I thought it fell out of. I will try it one spot over when I get home today and see if that makes a difference.
Also, sorry for bumping this thread with a new post each time i have a new thought lol. I can't seem to edit my old posts to include my new thoughts.

It works! It ended up being that the black wire a previous owner used was not put on the correct pin on the j2 connector on the a9 board. I counted 11 from the bottom up, attached the wire correctly, and presto! It works. I’m so happy lol.
A big thank you to the pinsiders who replied in this thread and lead me the correct way to find the answer. You guys rock!

Thanks! Yeah after I noticed the black was used instead of the red/green from factory, I started looking at what other wire colours were different too. It makes me wonder if a wire harness was swapped at some point or ?
I mean, I’m glad it all works now, but it’s brought in a new mystery just as we solved the last one lol.
Thanks again for your help solving the problem!