I have a system 4 board that has me scratching my head. I've replaced multiple ICs on it to get it to finally start booting, but it is always booting into the audit menu.

It passes all tests from Andre v2 and Leon's ROMs.

However when it boots with the game ROM (I am using it for a Lucky Seven) it goes straight to the audits menu. The quick power cycle trick doesn't work. When I press the diagnostic switch the lower LED comes on indicating a ROM issue, however all 3 ROMs are new EPROMs with valid checksums.

I replaced the 2 game PROMs with a single 2716 EPROM at IC14 but pinwiki does not list any potential problems that might cause.

Anybody have any thoughts about where to go from here?

New batteries, but the old battery pack so it might not be giving good voltage. But that doesn't explain why the quick power on/off trick won't get it to boot correctly?

I just burnt some a Hot Tip ROM and it boots just fine and the Williams memory test gives no errors.

I had seen several threads about the IPDB Lucky Seven ROMs not working correctly but my checksum matched the one listed in this older thread.

https://pinside.com/pinball/forum/topic/lucky-7-valid-rom-checksum

Not sure where to go from here as all of the game ROMs on IPDB have that same checksum that is not working on my board...

Burned a new ROM with the PinMame file and the Williams memory test now works correctly! I imagine it was probably just a bad EPROM.

The game is still booting into audits though. I am going to pull and test D17 and D19 as suggested.

I have also found a thread saying that IC24 going bad can cause booting into audits so I will check that as well.

Thanks for the assistance all. I will post back with any further issues.

Ok this board is starting to be seriously frustrating. Both D17 and D19 tested ok. I socketed and tried a new chip in IC 24. The game is still booting into audits. I can scroll through them fine but cannot advance to lamp tests etc.

Anybody have any ideas? I am using Seigecraft's System 3-11 diagnostic switch but could the male header on the board need to be replaced?

Forgot to say. Battery voltage on the board is 4.94 so that shouldn't be the reason it's booting into the audit menu.

I have tried a few different 5101s with the same results.

I have a donor board that I've pulled ICs off to try as well. At this point I've tried multiple 6800s, 2 different 6875 clock chips as well. All have the same results.

I have not replaced the crystal.

Unless someone has a better idea that is probably where I will go next.

Circling back to this, unfortunately I still haven't got the board working.

Currently it boots into audits but the p1, p2 and p3 displays are all garbage. The primary display and p4 are working fine. It is not an issue with the Master Display Board because it is a Wolfpac (and it was doing the same thing with the original displays). IC6 the 74154 also tests ok.

If I try to move through the tests the display test will work but then it crashes if I try to move past that to the solenoid test.

I have ordered some more ICs to continue shotgunning my way through I guess. I have traced the address and data lines for continuity and shorts and haven't hit anything that is obviously bad. I ordered a bench display tester to help with bench testing, and I am considering buying a oscilloscope. Definitely the most frustrating board I have ever worked on.

Finally making some progress on this. The display problems ended up being a stupid mistake on my part. I had the displays plugged into the wrong players. I am not sure why this mattered, but apparently with the Wolffpac displays it does.