Hello everyone. First time poster here, looking for some advice. I have acquired a Bally Cybernaut and I am trying to get it going for my wife. It was her dad's and he recently passed, so I'm a little excited to get it working again so her family can relive something from their childhood and maybe we can all make new memories together.

Issue 1: I can't get the playfield lights to work. The lights that are supposed to be always on seem fine, the lights that are in the upper left where the 4 rollover buttons are, work. Lights that are supposed to come for B-L-A-S-T feature and everything else around them do not come on. Nothing lights up for the ION Generator or where the drop targets are. Basically, any lights attached to the 4 boards under the playfield are not functional. This issue is present if you try to play or if you just turn it on and wait for "attract-mode". I am only assuming that there is a common ground somewhere for all of them.

Issue 2: Music/heartbeat doesn't play when trying to play the game. Maybe 1 out of 2 or 3 power cycles will allow me to hear sounds when I test the targets. All targets and switches do score when touched.

What I've done so far:
- Bought new and replaced all boards (4 in the back, and the rectifier board in the bottom), except for the cheap squeak board, I don't know what to replace it with, but I did buy the capacitor rebuild kit for that and replaced the 4 caps. The issue remains the same with all new boards and if I take them out 1 at a time and place the old ones back in. New fuses came with any part that had a fuse, and I've tested the slow blow fuse under the play field by the out hole and it all seems good.
- Inspected all connectors to the boards. No signs of burn damage or corrosion.
- Tested each light individually, all burnt bulbs replaced.
- Reflowed (if that's the right term) all solder joints where connectors would go.

My skill level:
I can somewhat read a schematic. I have no issue soldering. I am a novice using a multimeter, meaning that when I have to use one, I usually ask what setting to I put it on, and what do I need to touch?

I was hoping that this would be easily found by searching the net, and I'm just not having any luck. I already feel like I've dumped unnecessary money into it, but the end goal is priceless in my opinion. Anyone that wants to point me in the right place to start, or any "this is common, check this" tidbits of info, would be extremely appreciated.

Hi, thanks for the quick response. I'll get that manual highlighted as soon as I can, maybe tomorrow. But in the meantime, yep, i tried reseating all plugs and bulbs too. I checked for bad solder joints before replacing the boards and reflowed them for safe measure, but none looked cracked or weak. Test mode only flashes the ones that are currently on. No change with any boards I put in. I did set the dip switches according to the instructions from AllTek.
Boards replaced:
-MPU board.
-Solenoid driver board.
-Lamp Driver board.
-Rectifier Board.
-Aux lamp driver board.

The game seems to play properly aside from the issues, but I never know if I'm actually awarded any of the bonuses, etc. as a lot of the multipliers count down and add score after the ball enters the out hole. The image I'm adding isn't an actual pic from my machine, but everything inside the green area does not light except for the yellow arrow on the left and the orange shoot again light. If this is related, the shoot again light seems to always be on.

CyberLights (resized).jpg

I found the issue. The board closest to the out hole appears to be the first in sequence. If it doesn't light, none of them will. I focused attention here today and saw a burnt pin. Kind of obvious looking now that I see it. Can't believe I missed it, but that's ok. If I wiggle that wire, nothing happens, but if I put pressure on the connector, everything lights up (all four boards). I'm going to solder the board again and re-pin that connector. Hopefully all will be well at that point. I appreciate everyone so willing to offer advice so quickly. It definitely got me steered in the right direction for troubleshooting. What are some of your favorite sites to get parts from?

BurntPin (resized).jpg

NoWorkie (resized).jpg

Working (resized).jpg

Awesome. Thank you! I'll definitely let you all know if I get this thing going. My next step will be looking at why it doesn't play sound all the time. One thing at a time.