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Help with a Neo Geo repair

xodaraP said:
Good to know. I have a 1B stuck in watchdog at the moment. I'll replace the work RAM and check the CPU soldering
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Don't forget the 27c1024 bios sop, it's very unriable, specially if you got the one with "SP3" mark on it.
 
I'll check, I think I do. But the 1B has that nasty SMD thing that's almost impossible to replace.
 
xodaraP said:
I'll check, I think I do. But the 1B has that nasty SMD thing that's almost impossible to replace.
Click to expand...
You can get around by neobiomasta, that is openhardware too, i have printed 10pcs for 20bucks at pcbway.com and i have saved nearly 15 of these just by, mostly, doing just that.
Hower, on 1b, HC32 and bios sop replaces are almost mandatory.
I bought a pack of these and was the best to do while repairing them: https://it.aliexpress.com/item/4000919575578.html?spm=2114.13010708.0.0.70254c4dCUM1bj
 
Ok I'll order some of the PCBs I think. I only need 1 or 2 but probably good to have spares.
 
A small update: Correcting the orientation of the resistor pack has also fixed the calendar error. Now the board as per the diagnostics has 0 errors. Time to clean everything up now.

@ack I noticed that you have newer versions of the diagnostic bios at https://github.com/jwestfall69/neogeo-diag-bios. Is https://www.mvs-scans.com/misc/19a00-t1.zip the latest compiled version of the source, or do i need to compile the code to get the latest binaries corresponding to the source you have?

Also, are there any instructions on how to build it? I don't have a linux box at the moment. Is this something that would work in a particular docker image that i can spin up? Thanks.
 
Can some of you confirm me the resistor arrays are 1K x10? Are they bussed or isolated pins?
 
blonu said:
@ack I noticed that you have newer versions of the diagnostic bios at github.com/jwestfall69/neogeo-diag-bios. Is mvs-scans.com/misc/19a00-t1.zip the latest compiled version of the source, or do i need to compile the code to get the latest binaries corresponding to the source you have?

Also, are there any instructions on how to build it? I don't have a linux box at the moment. Is this something that would work in a particular docker image that i can spin up? Thanks.
Click to expand...
That 19a00-t1.zip url is the newest version.

I've only every built it on a linux machine. You should just need packages for compiling on the distro and vasm. Instructions on building vasm for the diag bios are in the README.md of my github. Once you have those its just a matter of running make in the sp1 and m1 dirs, which will result in output/sp1.bin and output/m1.bin being created.
 
Thanks @ack for confirming that the binary is built based on the latest source. I was originally confused by the timestamp on the binary files which was june 14th of this year, however, i saw a commit on June 30th at https://github.com/jwestfall69/neogeo-diag-bios/commits/master. But meanwhile, i did build the binaries from source based on the instructions you have and after comparing the ones that were generated on my machine, i can confirm that they are the latest and matched the ones you put out.

I'll burn them and give it a shot sometime during the week. Thanks so much.
 
The zip roms were originally generated from my smpte color bars branch. Merging that branch was the last commit to master, making master generate the same roms.
 
Finally got around to burning the chips and testing them out. They work perfect. Thanks @ack. I tested it on a a 2 slot that I recently obtained and every test was very easy to get to without having to power cycle the board. Saves so much time and effort. Thanks a lot for your efforts.
 
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