Maybe one of the harness has a wire with the insulation worn through and shorting out? Can you unplug the wires that go to the tllt and chimes on the side to see if it still happens?

Does your machine have the separate power board w/fuses and LED's on the inside back of the cabinet? If so do you get all LED's lit? I am just trying to get one of these things to work. Looks like someone added a jumper on the back of my power board and I don't know if that was from the factory or a hack someone did later. Any pictures?

Robert

I'm glad I asked for a picture. I'll post a picture of mine shortly. My board is slightly different. There is no F5, D5, or R5 on my board. It has 8 fuses. F1-F4, F6-F9. The LED for F8 is out on my machine.

If you break one of the clips holding the main PCB or any are missing I modeled that part up and you can print them in ABS plastic:

http://www.thingiverse.com/thing:2092664

Robert

If your 5V supply is the same as mine then it should have an adjustment on it. You may be able to carefully (slowly) adjust it to bump up the main 5V a bit at the PS so you get 5V at that mainboard. It may help.

Attached is a picture of the 5V supply I have. I just fixed some cold solder joints on it and replaced the 1K trimmer at R10 V ADJ. Once installed I was able to get is adjusted for 5V under load.

They may have had different power supplies in these so you'll want to see if it matches and if it has a similar V ADJ control.

Robert

AL_5VPS (resized).jpg

This is the main power board that I have. Slightly different than the one in your machine. I'm trying to find a match for my board to see if the wire on the back is supposed to be there as an update from the factory or yet another hack that I'll need to undo.

AL_PS1 (resized).jpg

AL_PS2 (resized).jpg

I'd measure both the DC and AC at the power supply and the main board. It may be time to replace that large filter cap on the main board. Maybe some on the Power Supply as well. Sounds like you are making progress.

For the first time I was able to get mine to power up and play a bit. Have some issues to fix on the displays and some lamps but otherwise it plays. Not sure if the remaining issues have to do with the one LED out on my power board (LED is OK) or if that is meant to be out because of the way my board was modified.

I hope you new 5V supply fixes the issue with your game.

This evening I was able to get all the computer controlled lighting to work on mine. I finally tracked down the issue the remaining lights and it was an odd one. All the computer controlled lights were powered by their own transformer winding and that was the one with the LED that was out. I couldn't find any issues om the board. That is when I pulled out the transformer and checked it on the bench. My heart sank for a moment when the portion for those lights seemed open. All the rest were good. After a bit more digging I found that although the wire was soldered to the lug on the transformer somehow the solder joint broke loose from that lug to the winding of the transformer. It was all right there just had oxidation and and open. Scraped off the oxidation resoldered that lug and now all my lights are back!! That is an issue you may want to watch out for. It was the first time I have run into an issue like that on a transformer. I was worried for a moment and thought that would be one more piece to track down. Now just to rebuild my displays and it will be good.