Virtua Fighter 4 cart will not boot

[OldFoo]

This is how I received a Virtua Fighter 4 cart:

I received a Virtua Fighter 4 cart for free, because it was not working. The Naomi 2 splash screen comes up, but then the screen goes black and after a moment the splash screen comes up again, sometimes on a screen that's checkered with black squares. The game can go to the test screen and the cursor can be scrolled, but half of the letters are missing from the menus. Is there any trick to reviving this? I opened the cart and there was no visible damage.

After the things mentioned above, I tried cleaning the cart PCB and it's contacts. Not that they looked dirty, but I just thought to try. After this, the game still wouldn't boot and just kept on going from splash to splash, but the test screen started working fine. I did a ROM check, and this is the result:







Is the top row normal?



What would a cart do if used on machine with the wrong BIOS? Could this be about the BIOS?

[OldFoo]

could be a low +5 volts if you are running sega i/o and naomi

[OldFoo]

could be a low +5 volts if you are running sega I/o and naomi

Yeah, Sega I/O.





I can borrow a multimeter, but please explain this to me like the noob I am: To measure the voltage, where should I stick the multimeter, and what setting should I have on it?

[OldFoo]

normally you need two power supply if using sega i/o,one for the naomi and one for the i/o

this is dependant on the power rating of the psu though,i am pretty sure the standard sun naomi psu will not run naomi/gdrom and sega i/o

not 100% sure on this so maybe someone else can pipe in

you can read the +5 on the jamma i/o by setting your multimeter to dc volts.place the red probe to pin3 or 4 on the top and the black probe to pin 1 or 2 on the top-you should get around 5.05

[OldFoo]

Is the top row normal?

Yep

[OldFoo]

normally you need two power supply if using sega I/o,one for the naomi and one for the I/o

this is dependant on the power rating of the psu though,I am pretty sure the standard sun naomi psu will not run naomi/gdrom and sega I/o

not 100% sure on this so maybe someone else can pipe in

you can read the +5 on the jamma I/o by setting your multimeter to dc volts.place the red probe to pin3 or 4 on the top and the black probe to pin 1 or 2 on the top-you should get around 5.05

I have a full Universal Cab, it does have a second PSU inside it as well, if I remember correctly.





Thanks for the help! I'll test it as soon as I get home.

[OldFoo]

Man, was I confused. I'm thinking how dumb am I when I can't find a JAMMA connector anywhere in my cab.



After a LONG while, I realised I have this as my I/O









Ok, so where do I put the multimeter probes in this I/O? The +5,+5,GND,GND-connector that is marked on that picture is free on my cab, instead the connector on the right of it is connected.







EDIT: Okay, I tested the connector on the top right corner, and putting the black probe on either of the two on the left and the red on the two on the right, the multimeter gives out -5.19 V.



What's with the negative reading? But anyway, should I turn down the voltage, could the VF4 be not working because of too much voltage? Does too much voltage damage the systems, should I turn it down?

[OldFoo]

You're getting a negative reading? You should check your wiring to see if something was wired backwards.

[OldFoo]

Maybe I missed it but...



Have you tried any other game cartraiges?

[OldFoo]

EDIT: Okay, I tested the connector on the top right corner, and putting the black probe on either of the two on the left and the red on the two on the right, the multimeter gives out -5.19 V.



What's with the negative reading? But anyway, should I turn down the voltage, could the VF4 be not working because of too much voltage? Does too much voltage damage the systems, should I turn it down?

You have just inverted the probe. The voltage is fine.