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I replaced the 245s first. ^^

First you'll need to be able to flash tsop56 S29GL128 chips, I sourced the chips from aliexpress but mouser also has them. Then you'll need to order some flex pcbs from osh park, pcbway etc using the attached gerber files. This repair will require a microscope or a magnifying glass and some...

It's easy to miss old posts, I only found it and remembered it because I was looking for something similar (a diy tsop56 adapter).

https://www.arcade-projects.com/threads/mx26l6420-adapter-for-xgecu-t56-programmer.28314/

Replace the buffer on the bottom think it's a 16245 off the top of my head and the tsop flash chip with a known good one. If doesn't fix it that's likely game over, as it will be a bad bga connection on one of the custom chips or the chips themselves.

Doesn't matter I've drawn my own up in kicad now, it'll be released for free once it's confirmed working.

Funny how you post a no I won't help post followed by a post asking for help. I know the solution to the problem you're having with the 171-7978b conversion too, oh well.

I've had a graphics glitch issue like this on a Naomi 2, it was tricky to track down as all the rams passed. I ended up using freeze spray on the video rams one at a time until the glitch went away. The only issue was I replaced the ram and the issue didn't go away. Turned out the freeze spray...

@Starcade I don't think yours is the security ic since it doesn't give 0000 checksums, did you replace the SMD 373s too?

Virtua NBA, Virtua Striker 2 Ver 2000 or Virtua Tennis are your best bets for the donor security chip.

They aren't game specific but not every cart uses them. I was going to link you to guru's Naomi page that lists what cartridge type every game uses but his page seems to be down at the moment.

The custom 315-6050 CPLD chip is bad, you'll need to take a replacement from a donor cartridge.

You just press the test button on the Naomi motherboard with the cartridge installed and there's an option near the bottom to do a cartridge test, it'll give you the checksum for the eprom and the maskroms.

Check the voltage test pads in the corner of the board to see what voltage(s) you're missing.

Merged balls under the chip or the chip itself is shorted.

Did you do a cartridge rom test? do all the checksums come back 0000 or random and change every time? Did your professional dude replace every logic chip? there's a lot of 245 / 373s (9 if I remember correctly), they all need to be replaced.

0.7mm is the correct size I think but don't quote me on that.

That must have taken some serious heat to remove with the heatsink still attached. :hilarious:

Are the gerbers available for those adapters or does anyone sell them? I've got a naomi 2 cart with two bad roms I'd like to replace.