Track & Field PCB repair - how to identify customs?

87 t-66

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I'm trying to piece back together a parts board and it came with 3 customs. How can I identify where these go and identify/source the others that are missing?

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I'm trying to piece back together a parts board and it came with 3 customs. How can I identify where these go and identify/source the others that are missing?

View attachment 844477
Gonna be kinda tough with the numbers scraped off.... I suppose the only way to really know without any numbers is to see how many on the board have the same number of pins and see how many possible places there are to fit one. I do not know much about the pinout of these konami customs, but if its like EPROMs, the power and ground pins on chips of like size will likely be in the same place. With that info (and making sure you don't insert one backwards) you should be able to try putting them in the different sockets they will fit in until you get a configuration that will boot. The BEST way to do it I would think would be to substitute one chip at time out on a working PCB, and if it boots, write with a sharpie on top of the chip the location on the PCB (i.e. 7B or 4A) until you have a list of where each chip goes. Unfortunately I understand having a working PCB may not be possible.

This is a thread containing a list of all the Konami Customs ICs, their respective games, and their function. It may be beneficial also if you know the architecture of the board.

IF there is ANY way to get a number off the chips, that list will help you greatly. Definitely seems like it won't be child's play, unless there is a neat trick a veteran on here knows. Best of luck to you!
 
Top: 502 or 504
Middle: 503
Bottom: 082 or 083

To figure out the ambiguous ones, probably easiest to just try them in another Konami board. You'll get obvious graphics issues when you mix up 082 and 083, but the chips survive the screw up (in my experience). Don't think I've ever tried the 502/504 swap.
 
I do have another working board but it has the daughtercard custom replacements which are soldered in. I'll try swapping as many around as I can and hope for the best I guess.
 
If you want to send them to me, I can do the testing per @mattosborn idea of playing musical chairs, I will then label and send them back.
DM me if you would like to do that.
I have 4 or 5 Konami TnF boards on the bench that are all socketed and ready to test for those if that helps.
 
Use the pin counts as above and then consider the 082 socket. Put a candidate in and then either hope the video starts generating, can check any of H, V or sync pins

I think putting a 083 in a 082 socket would be harmless.

It's interesting how varied the labelling on the devices is... Small fonts, large fonts, some are numbered on top left some have no numbers etc.
 
I pulled the two daughtercards off my good board so I can test the customs. Even with all of the known good customs and roms on the second board it's not booting, just stuck on a static screen. Will start poking around later to see if I can get it going.
 
I pulled the two daughtercards off my good board so I can test the customs. Even with all of the known good customs and roms on the second board it's not booting, just stuck on a static screen. Will start poking around later to see if I can get it going.
Burn test rom and drop it on there.
 
It still boots to a static image with the test rom. It seems to be watchdogging. I hear a constant click on the speaker and the reset pin on the cpu is toggling at the same rate.
 
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