MKV Manuals & Troubleshooting Help - No Screen

[MrKarter77]

Hey all, not sure if im in the right place, but any help i can get is appreciated.


I acquired a MKV (spring carnival) machine, currently the original screen is dead, but before i go spending a few hundered on replacement parts, i was hoping to test the rest of it.


i have a rgb/cga to vga convertor, but cant get any signal on it, both LED on the power supply light up, and i get 2 red lights on the main board, plus the note acceptor/coin mech seems to work. but thats as far as i get, As for video, on the convertor i get no signal, is this normal? is there a way to test it?

[MrKarter77]

Ok, a little more digging, i actually have a MK6 Board. Still not sure where to go from here

[MrKarter77]

@dave2228 your inbox is full mate

[MrKarter77]

Ok, i think im actually getting somewhere now.
So the crt tube is fine, the neckboard/flyback board is dead, WG u3100 unit will look at a monitor


However its a MKV chassis, with a MK6 board.


i believe that i need a video board of some sort attached to the main board as pictured below?

[MrKarter77]

[MrKarter77]

So found out i was missing an IO / Driver board thanks to GamingNZ1


he sent me one but its the wrong one, he has had some issues with a storm so might be a delay hearing back. however this picture shows my issues
https://imgur.com/jyojtLf


and here are some other things it tried regarding removing the board and running it
https://imgur.com/a/jpJY7i3


Any help is appreciated, i have no screen output to the vga lead.

[Heihachi_73]

If that's your board with the QLD chips installed, you will also need a way to hook up or simulate the QCOM protocol otherwise the game will be stuck in a disabled mode when it does finally boot up. Swapping the EPROMs with NSW versions will get around the QCOM stuff as the boards are identical, but you will also need a NSW LAB comms board before those will run.

On a side note, is it possible that the "right" system EPROM (U83) has been wiped over time, given that it's got no label? If one of the base chips is blank it won't even POST.

[MrKarter77]

Thanks for the reply, have been told that my MK6 board wont work with my MK5 system, and is missing a driver board. so have a whole new mk5 board on the way, the chip had a sticker but i knocked it off.


Just waiting to hear about a driver board and hopefully ill be up and running.

[MrKarter77]

Just to update on this thread, i ended up getting a known working board, a comms board, hard meters, set that all up, and got a boot loop issue.


I then acquired a whole new machine in parts that is a mk5.2 instead of the 5.1, the parts in that machine boot fine and machine is playable.


Will be doing some further testing/probing on the 5.1 to try get it to work, however im also short of a screen, so if anyone in aus has a LCD and bezel for a MVP/mk5.2 that works, i did get a display from an igt i was going to fit however it shows unsupported.