Killer instinct 2 on k1 board errors

[tamfab]

Having some disk error problems running ki2 on my k1 board.

I’ve got the proper ki2 bootrom for the conversion and also for allowing cf card and others to boot not requiring original hdd as well as the ki1 upgrade board.

I keep getting disk errors. I’ve checked the upgrade board too and fixed the missing pin connections, now I have continuity on all pins.(see pic below)
Does anyone have an idea of what I can do to fix this...especially experience with the upgrade board on what else I should check.

Ki1 obviously works fine.

please see the attached pictures...

 

[ekorz]

Did you just connect the input pins to the output pins? That would bypass the entire rest of the pcb. The original board sends some of the input signals to their output pins, indirectly. Your images are too small for me to see clearly (try using imgur.com or another host) but the first thing I'd suggest is removing all those jumper wires.

 

[tamfab]

I did bypass the 6 non working pins...I had the same screen come up before I did the bypass and unfortunately after as well

 

[ekorz]

Let me know which 6 pins and I’ll trace them on my board for you if I can. But I don’t think they’re supposed to be directly wired to the other side.

There’s not much to check on the board otherwise. Cold solder joint on one of the connectors. Missing component. Cold joint on the custom chip. Could just be a bad chip too but it would be hard to diagnose.

Could you upload a higher resolution photo of both sides? Use an image host if you need, like imgur.com

 

[tamfab]

Pins 11,14,15,36,38,44

https://i.imgur.com/pRxryzU.jpg
https://i.imgur.com/5ElRyOM.jpg
https://i.imgur.com/787lr7P.jpg

Really appreciate your help!

 

[ekorz]

Just checking, which way are you counting the pins?

edit: nevermind you're doing the first one... stay tuned

 

[tamfab]

I was counting from the way it is labelled on the board ie. 1 and 44 labelled.
Yes according to the first pic.

Also do you have any info regarding the patched bootrom required to run ki2 on ki1 board with no upgrade card?

 

[ekorz]

None of those i/o pins have direct continuity, I would recommend removing those jumper wires. Additionally I would reflow the solder on these three pins.

I have no info about that boot rom, but it would be nice if the creator released the rom, wouldn't it?!!

 

[tamfab]

I removed the jumpers and tried reworking the above recommended pins...still no go!
So on your upgrade board those i/o points dont’s show continuity? Not even pin 44?

pretty lost now...I don’t really know where to turn...I’m considering changing the entire 2x22 idc header even...

 

[ekorz]

right, those input pins don’t show continuity to the respective output pins. Some don’t seem connected at all (like pin 44) and others do show some resistance if I measure that, so they are at least in circuit.

I see a small scratch on one trace, above the pin that was clearly loose. I don’t think it looks deep enough to have cut it but you could make sure.

Do you have a probe or oscilloscope? I could see what pins have what activity if you see one stuck high or low or something. Or the pins on the custom U96