Sega-Naomi

OK,



A few of you may know of my Supergun project that went titsup.



I had a loose wire, which finished off in having the 240V AC input being spooned down a ground line.



Suprisingly, every fuse in the house went POP, and ever since the N2 stopped syncing to the Plasma.



So where are we now...



Mr Meg suggested I buy his SUN PSU, and as I've just got a 240>110 converter, I fired the system up again. If anything the situation has got worse. I then fired up the N1 with no problems.



I decided to have a look at the N2 mainboard ('cos I'm such an expert at these things - yeah right, considering how I fooked this in the first place) and then looked at the filter board. 2 things struck me, in that I could see 2 copper tracks quite clearly. One is the ground for the Audio, the other the ground for the Video. With my continuity tester, the video ground track is broken, which is hopefully why it's fooked.



I swapped the filter board with the one from the N1, and apart from the image being widely off centre, the piccy is perfect.



Looking at the N1 filter, I've noticed that the covering over the ground track has started to peel away.



So I suppose my questions are...



1) Is the N1 Filter board setup for the N1, and the N2 for the N2 given that the N1 picture is bang on centre, but when I put it on the N2 it isn't?



2) Is this peeling a known fault, or just coincidence?



3) Should I run a ground wire to replace the track, or get a new filter board?



4) If I need a new filter board, anyone have a N2 one for sale & How much?



Cheers



John



P.S.



Also posted a Killercabs.com

Sorry to hear about that. :smt009



I will 'go on a limb' and say that the filter boards are not probably not exactly the same. Assuming nothing is wrong with the main board, switching to another N2 filter board might fix your problem.



Although running wire to complete pcb circuits might work, there is the possibility that something unseen could go wrong and fry the main board. So, it is possible, but it's in the 'at your own risk' category.



As for the peeling, this issue hasn't been brought up in the forums. So, I don't think this is a common problem in the Naomi. If anything, it probably began during your shorting incident. Of course, until I see the peeling, I wouldn't know for sure.

Pretty sure both filter boards are 100% the same, check with the part #.



I am sure the Naomi 2 is pretty much a Naomi 1 with some extra surface ram, and extra GPU.

AndyGeezer wrote:Pretty sure both filter boards are 100% the same, check with the part #.



I am sure the Naomi 2 is pretty much a Naomi 1 with some extra surface ram, and extra GPU.

Yep,



Part numbers are the same on both. Only difference is one is dark green the other a slightly lighter shade.



Did the re-wire & it works. Only issue I have now is that the image is now no longer in the middle of my TV. Used to be a 16:9 pictue filling the TV, now is a true 4:3 picture, but to the left of the screen.



Swapped the filter boards so the un-"modded" is attached to the N2.

I didn't check, but I assumed they might be different because of the color differences.

It's definately something to make a note of. :smt115

vpp levels might be different on the other filterboard, I had a surge on the RGB once, and it damaged the RGB circuit on the Naomi mainboard, still worked, just the colours was really dull.

AndyGeezer wrote:vpp levels might be different on the other filterboard, I had a surge on the RGB once, and it damaged the RGB circuit on the Naomi mainboard, still worked, just the colours was really dull.

What I don't get though is that my N2 was connected at the time, but my N1 is also affected.



The VGA input is fine, as I have connected my server up to it with no issues.

Really? I thought you said in your first post that you ran the N1 without any problems. :smt017

joshua3dg wrote:Really? I thought you said in your first post that you ran the N1 without any problems. :smt017

Sorry - My bad English again. Should have read N1 ran with no sync problem.



Image is still to one side though

Have you tried the Naomi on a CRT computer monitor? If you get issues with the CRT, then it's the Naomi. If it looks fine, then it may be something with either the VGA cable, or the plasma VGA input (possible a surge feedback from the initial short circuit).