I recently bought a naomi gd rom set up with a sega I/O and when I started the system it seemed like the picture was far too bright. When I checked the color settings in the test menu there was a large amount of color bleeding and the black its more of a grey color.
I had a spare naomi mother board and swapped them just in case but it did not seem to make a difference. I also put one of my cps2 boards in and it looked fine. Last thing I tried was to adjust the brightness on the back of the monitor I believe its called the flyback? didnt really seem to help with the color problem. Could this be related to the separate power supply that came with the system. The machine I am running this on is a Super Neo 29 if that helps any. :smt017
Naomi Too Bright/Color bleeding?
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OldFoo
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OldFoo
Yeah that is true but I think its safe to say that there is something wrong with the set up. I have had a pgm, mvs, cps1, cps2, cps3 all in the same cab with little or no adjustments to the monitor.
I really should stress the whole color bleeding thing. When I say color bleeding I mean when in the color section of the test mode each color bar bleeds horizontally and fills the whole screen from left to right. You would normally have a gradient from the brightest shade of the color to the darkest and the background is black. What I get is a hazy color bar that stretches across the screen and in the middle there is the normal gradient. I know I am doing a bad job of describing it but I can tell you for sure it is not just the normal tinkering one does when trying out a new pcb. :smt085
I really should stress the whole color bleeding thing. When I say color bleeding I mean when in the color section of the test mode each color bar bleeds horizontally and fills the whole screen from left to right. You would normally have a gradient from the brightest shade of the color to the darkest and the background is black. What I get is a hazy color bar that stretches across the screen and in the middle there is the normal gradient. I know I am doing a bad job of describing it but I can tell you for sure it is not just the normal tinkering one does when trying out a new pcb. :smt085
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OldFoo
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OldFoo
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OldFoo
grantspain wrote:all the mobo you mention are jamma 15khz,the naomi is 31khz with a switch option to scale to 15khz-thats why it is different
Sorry I left out some important info which is that this is not the first Naomi system that I have run on this cab. The old set up I was using was going through a capcom I/O not the sega I/O and that was the only difference and the capcom I/O one worked fine. So yes I am aware that the Naomi has a switch to operate in 15khz but this is not the issue. My cab is perfectly capable of running a Naomi set to run in 15khz which is what my set up is using.What I was asking is what piece of hardware is to blame for my problem and how can I trouble shoot or repair the issue.
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OldFoo
goatboy wrote:FYI. I've got a Naomi with Capcom I/O running on 15khz in a New Astro City. The picture is excellent as with all my other PCB's. (PGM, Cave etc.) The only difference is I'm using a capcom I/o but no bleeding colors here. Something wrong with your I/o?
If it is my Sega I/O is there a way I can test it because I don't have any other I/O to try and swap to see if thats the only issue. I tried changing the usb and vga cables that go from the Naomi to the I/O but the issue is still there. :smt022
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OldFoo
I'm going to have to go with grantspain on this one...I too run many systems inside my cabs, and quite honestly, I am surprised you have never had to readjust the monitor before...
I think something easy to try(just so we can know for certain if it is or is not the issue) is to adjust the contrast on the monitor remote board(not the knobs on the flyback). These are what grantspain was talking about(the ones on the remote board)...the knobs on the flyback are signal and focus I believe and generally don't need to be mucked with for this sort of thing.
anyway, if that fixes it then there is your issue....if not, then yeah, first suspect would be to check the IO card, VGA cable, etc. As far as testing the IO cards go, I generally just check the components one by one looking for a fault in one. Not at all the most effecient way to do it, but gets the job done, especially if you're unsure where to begin.
Speaking personally, I've found my own naomis to be dimmer than my other systems...so for example, if I adjust to make the naomi look nice and bright, then when I connect a CPS2 system or neo geo it looks blurry and too high contrast...when I adjust that down for the CPS2 or neo geo then reconnect the naomi, it looks too dark...so I ended up just finding a "sweet spot" on my monitors that works good for all the boards(without any readjustment) but not perfect for any of them. I have on one occassion also run into a naomi with a semi-fried vga port, which worked, but didn't work properly, and that caused lotsa weird anomolies too...so that could be something else to look at too...
but honestly I would think just adjusting the contrast, brightness, etc. on the remote board of the monitor would fix it for you like grantspain says....having contrast too high, etc can make things looks really weird in a number of ways....anyways, just trying to be helpful.
I think something easy to try(just so we can know for certain if it is or is not the issue) is to adjust the contrast on the monitor remote board(not the knobs on the flyback). These are what grantspain was talking about(the ones on the remote board)...the knobs on the flyback are signal and focus I believe and generally don't need to be mucked with for this sort of thing.
anyway, if that fixes it then there is your issue....if not, then yeah, first suspect would be to check the IO card, VGA cable, etc. As far as testing the IO cards go, I generally just check the components one by one looking for a fault in one. Not at all the most effecient way to do it, but gets the job done, especially if you're unsure where to begin.
Speaking personally, I've found my own naomis to be dimmer than my other systems...so for example, if I adjust to make the naomi look nice and bright, then when I connect a CPS2 system or neo geo it looks blurry and too high contrast...when I adjust that down for the CPS2 or neo geo then reconnect the naomi, it looks too dark...so I ended up just finding a "sweet spot" on my monitors that works good for all the boards(without any readjustment) but not perfect for any of them. I have on one occassion also run into a naomi with a semi-fried vga port, which worked, but didn't work properly, and that caused lotsa weird anomolies too...so that could be something else to look at too...
but honestly I would think just adjusting the contrast, brightness, etc. on the remote board of the monitor would fix it for you like grantspain says....having contrast too high, etc can make things looks really weird in a number of ways....anyways, just trying to be helpful.
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OldFoo
The remote board is the one under my control panel? Because if it is that was the first thing I tried to adjust. Maybe I just cant find the sweet spot but I have never had so much trouble adjusting the picture before even when I was running my atomiswave set up which is supposed to cause people all kinds of trouble on low rez monitors. :smt017
Seem like no matter what combination of monitor adjustments I do there is something wrong with the image being displayed. One thing I noticed is that the top like half inch of the screen in always brighter than the rest of the monitor. The thing that keeps bugging me is why did I not have this problem with the capcom I/O. I mean the image should not be displayed different just cause I am using the sega I/O right?
Thanks for the suggestions I will check the vgs ports next.
Seem like no matter what combination of monitor adjustments I do there is something wrong with the image being displayed. One thing I noticed is that the top like half inch of the screen in always brighter than the rest of the monitor. The thing that keeps bugging me is why did I not have this problem with the capcom I/O. I mean the image should not be displayed different just cause I am using the sega I/O right?
Thanks for the suggestions I will check the vgs ports next.
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OldFoo
The remote board can be anywhere really...I sometimes have trouble locating them myself...but if the one you're talking about is directly connected to the monitor chassis then yes, that's it. So if that didn't work, as well as your other tweaks and other systems work fine then we can rule out the monitor for sure now I would think.
That being said, I would also rule out the wiring at the harness since the other ones work ok....if using same cables used with capcom IO can rule those out too...
So, yeah, most obvious things at this point would be either the IO or the naomi itself....if you still have the capcom IO do a quick test(if you haven't already)...connect up the capcom IO to the setup as it is, and see what happens...if picture is fine again, then definately the IO is the issue, if not then naomi itself is issue....then we know for sure what to focus our attention on.
If it turns out to be the naomi(less likely-just my opinion though) then first thing to check is the vga port and parts in that line of the circuit...
If it turns out to be the IO then I would start by checking around the vga port again, and possibly check the tracks around the jamma edge as well where the vid lines go...then the usual stuff like checking caps, transistors, etc. The IC chips themselves are kinda hard to test so if everything else is checking out ok and it looks like it's a chip, then probably best bet is to replace the IO card unfortunately because it will usually cost as much to have it repaired properly as it would to buy a new one off ebay. Anyways, maybe that gives you somewhere to start...let me know how it goes...I'll try to help much as I'm able...
That being said, I would also rule out the wiring at the harness since the other ones work ok....if using same cables used with capcom IO can rule those out too...
So, yeah, most obvious things at this point would be either the IO or the naomi itself....if you still have the capcom IO do a quick test(if you haven't already)...connect up the capcom IO to the setup as it is, and see what happens...if picture is fine again, then definately the IO is the issue, if not then naomi itself is issue....then we know for sure what to focus our attention on.
If it turns out to be the naomi(less likely-just my opinion though) then first thing to check is the vga port and parts in that line of the circuit...
If it turns out to be the IO then I would start by checking around the vga port again, and possibly check the tracks around the jamma edge as well where the vid lines go...then the usual stuff like checking caps, transistors, etc. The IC chips themselves are kinda hard to test so if everything else is checking out ok and it looks like it's a chip, then probably best bet is to replace the IO card unfortunately because it will usually cost as much to have it repaired properly as it would to buy a new one off ebay. Anyways, maybe that gives you somewhere to start...let me know how it goes...I'll try to help much as I'm able...