TokyoScarab
n00b
- Joined
- Oct 19, 2017
- Posts
- 8
Hi, I recently bought a MV-1 that plays games but didn't have any audio. This is gonna be a little bit of a book so I apologize for the length. I'll post all the details of my setup at the bottom I got it in plans of adding it to my console collection and setting it up so I can play it without the need for a bulky cab. I've already built my own video encoder board for composite (I know lol). I use a crt for stuff and don't really wanna go rgb quite yet with all my systems. I noticed a problem where it seems I'm not getting any of the R in my RGB signal. This isn't a problem with the video board as I have pulled voltages from the jamma pins for the RGB. The G and B are about in the 100-120mV range but the R is like 8. When I was testing the video early on there seemed to be a normal color image but not much anymore and I'm not quite sure why. The resistors before the jamma pins all check out to their printed values. How far back and where do I check to see where the red signal is getting jacked up?
The audio issue was only described as there wasn't any, but I noticed the audio switch (stereo / mono) is just plain gone, well half gone. The top is gone and the exposed internal pins are still there. I've been trying to work all the traces around it out to see how to potentially bridge these gaps. But since I'm going the 5v route on this, I may need help figuring out how to set up the headphone output part. I've tried testing the headphone out but not getting any audible signal but there's voltage going to it. I've also probed the YM2610 pins and they are all outputting voltages on all the pins though I'm not fully sure what all of them should be putting out but I have read the datasheet on it.
The only other issues with it are that I am suffering from some slight graphical issues as well as some some random resetting on a few games I've tried. I saw in another post that it could be from the console drawing more power than the supply can put out on some games. I'm using an adapter I grabbed at goodwill that's 5v at 2.6A which from what I've looked up, should be plenty(?). I've tested a few games and while the system is running, I've pulled about an average draw in the 1.5A range. Maybe there might be some good games to suggest I try that are known to be a little beefier. I did try using a credit card and some Deoxit D5 and using part of an old but clean sock to clean the pins. I might give it another pass, but the initial pass got rid of that NES style glitch look I was originally getting .
Anyways, those are the initial problems I would greatly appreciate some help on. I'm new to owning a MVS but have a good foundation in electronics knowledge. Hope to hear back
Set up Details:
Neo Geo MVS Model MV-1
Power adapter: +5v @ 2.6A
Only game to test is 161-1 cart with capacitor audio mod done
Power, ground, and video done using jamma harness
Current video I'm getting out of it (don't mind the framerate, it's just my capture)
https://www.youtube.com/watch?v=dNxr6PuV1AI
Audio switch pics (the blue wire is 5 volt audio mod I found here http://www.jamma-nation-x.com/jammax/tutorials.html ):
https://imgur.com/a/5B9yH
The audio issue was only described as there wasn't any, but I noticed the audio switch (stereo / mono) is just plain gone, well half gone. The top is gone and the exposed internal pins are still there. I've been trying to work all the traces around it out to see how to potentially bridge these gaps. But since I'm going the 5v route on this, I may need help figuring out how to set up the headphone output part. I've tried testing the headphone out but not getting any audible signal but there's voltage going to it. I've also probed the YM2610 pins and they are all outputting voltages on all the pins though I'm not fully sure what all of them should be putting out but I have read the datasheet on it.
The only other issues with it are that I am suffering from some slight graphical issues as well as some some random resetting on a few games I've tried. I saw in another post that it could be from the console drawing more power than the supply can put out on some games. I'm using an adapter I grabbed at goodwill that's 5v at 2.6A which from what I've looked up, should be plenty(?). I've tested a few games and while the system is running, I've pulled about an average draw in the 1.5A range. Maybe there might be some good games to suggest I try that are known to be a little beefier. I did try using a credit card and some Deoxit D5 and using part of an old but clean sock to clean the pins. I might give it another pass, but the initial pass got rid of that NES style glitch look I was originally getting .
Anyways, those are the initial problems I would greatly appreciate some help on. I'm new to owning a MVS but have a good foundation in electronics knowledge. Hope to hear back
Set up Details:
Neo Geo MVS Model MV-1
Power adapter: +5v @ 2.6A
Only game to test is 161-1 cart with capacitor audio mod done
Power, ground, and video done using jamma harness
Current video I'm getting out of it (don't mind the framerate, it's just my capture)
https://www.youtube.com/watch?v=dNxr6PuV1AI
Audio switch pics (the blue wire is 5 volt audio mod I found here http://www.jamma-nation-x.com/jammax/tutorials.html ):
https://imgur.com/a/5B9yH
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