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Problems with a Mega33 Cab

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Domino:

In need of help here... pretty please  :notworthy:

I pulled out the MVS motherboard and mounted it in my TV Game cab.
After checking that the Compugam -> jamma wiring was correct i booted it up.

In this cabinet the monitor displayed multiple transparent images och metal slug 2 running. (blury transparent in layers on top of eachother, will post pic later)

The game at least seems to boot up fine.

Seems like the big problem is in the monitor then :/
Where do i start with the troubleshooting?

Note: On bootup in the TV Game cab, it displayed Mega33 system, so it seems like the motherboard is the one that came with the cab.


Thankful for any help provided :)

Domino:

Here's what i get when the TV Game cab is booted up with the MVS from the Mega33 cab


mrclean:

The other cables on that harness Red Green Blue (Black for ground) and yellow / White sometimes grey (sync) cables that are connected together are your video cables that go into the monitor, looks like you have a sync issue.


I would read this to identify your wiring being that it's JAMMA :

http://www.jammaboards.com/jcenter_jamma_pinout.html


it could also be a pot on the monitor, such as v.hold / h.hold .. try to tweak with them . That should stop line scrolling and messed up graphics. V.size , Brightness, H.Size, Contrast shouldn't have anything to do with it. They look like little white knobs on the monitors chasi.

Domino:

Thanks a lot mrclean :)

Great when someone confirms your suspicions, it makes it a whole lot easier.

I've already spent about an hour checking all the wiring so its correct for Jamma & NeoGeo.
the source of information is hardmvs.com (http://hardmvs.com/manuals/Jamma2NeoGeo4SlotPinout.pdf)

The signal wiring (RGB) is correct, if I'm not completely mistaken the H.sync & V.sync is connected to the same pin.

I'll open up and try to find the monitor pots and see if I can get a correct picture that way first :)

My memory isn't the best, but I'm quite sure that my sync cables were grey/yellow.

Once again, thanks a lot for the help :)

Forces21:

The original problem you reported in the first post, judging by the pictures you show, may be down to the power supply to the NEO-GEO board. I'd connect it back up to the original cabinet and then test the voltages coming from the Harness on the NEO-GEO board. I would suspect an incorrect +5v feed. If this is the case then there is usually a pot on the powersupply to allow you to increase or decrease the voltage. You should aim to get this as near 5.0v as possible. Some boards require a little more (not more that 5.2v normally).

Hope this may point to the right answer for getting your original cab working. Just thought I'd mention this as when you go altering things on your working cabinet you could end up making it not work for any other boards you have (if there is a problem with the NEO-GEO board).

Regards

Forces21

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