The LED's light up on the board. Both fans turn on. But I have no video or audio. I popped in multi-region bios into it and still no difference. The board seems to have some mods done on it. I don't know what these mods are. Are these factory mods? Should I remove the mods to get this board going?
Help me figure out what was done to this Sega Naomi board
- Thread starter RealMFnG
- Start date
Those were done by an experienced tech. Will be very difficult to trace what had to be done just by looking at it. 
Like mitsu said, that is real tech repair/mod work. I would contact Ken at irepairsega.com and show him the pics, he might be able to figure out very quickly what was done and why. He might solve your problem.
Ken says it is a factory mod and I should leave it in otherwise, I will have "two problems". He says to replace the super cap and clean the traces. I have a super cap on the way.
TylerDurden67
Enthusiast
- Joined
- Jul 21, 2015
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- 109
late answer but yes factory mod. It's an RevA board?
Glad to see that sir Ken is confirming what I wrote in my repair log
skate323k137
Enlightened
The green wire looks like the factory repair on a lot of MvC2 carts.
The supercap isn't necessary, so you can pull that and clean that area. AFAIK it's only for bookkeeping information; I generally pull them off my NAOMI boards as soon as I get them.
The supercap isn't necessary, so you can pull that and clean that area. AFAIK it's only for bookkeeping information; I generally pull them off my NAOMI boards as soon as I get them.
Ken operates out of Sunnyvale, CA. As fate would have it, that is just 15 minutes from my work. I am going to drop off this Naomi to him, possibly another. The other Naomi I have has error code 01 which is sounds DIY'able. Depending on what Ken charges, I may ask him to just do both.
Finisterre
Professional
Those look a lot like the fixes done to my board (that is working fine), noted here: "there is a patch from a "D1" to a 6 pin header, and over to "C25", anyone know what that would be all about?" [1]
lukemorse1
Professional
with the top off, and facing you as you are looking at the connectors where the rom board fits in, on the cpu heatsink with the fan on it, using your 2 thumbs and pressing on the front 2 corners of the cpu/heatsink, hold down slightly firmly and keep pressure there while you have someone turn on the power. You should see the system boot but only when pressure is applied and only while you have pressure applied. Really needs 2 people to pull off but can be done with 1 person if you quickly throw the power and then hold the points I told you.
You will have to hold it for about 10 seconds.
You will have to hold it for about 10 seconds.
lukemorse1
Professional
those wires and patches are normal btw and nothing to be concerned about
I have 3 like that
I have 3 like that
This thread is from long ago now when I first got into the hobby. Naomi was the first arcade board I targeted. Followed the the CPS3. I never got Ken to repair these boards. Anyways, Ken ( @irepairsega ) told me then that these are factory mods and it isn't worth his time and/or my money for him to repair Naomi 1's. He was right. I have since picked up numerous Naomi 1's for on average $25 a piece. Ken's hourly rate was then around $90; I am sure it is higher now since everything has skyrocketed in the past 2 years in the hobby.
Some good came of the parts from this dead Naomi. The filter board went to @jugu. I sent a multi region bios to another member. I used the case for another Naomi. I practiced SMD soldering on the chassis. Even attempted to repair the traces by watching videos from @lukemorse1. But alas, can't save everything.
Some good came of the parts from this dead Naomi. The filter board went to @jugu. I sent a multi region bios to another member. I used the case for another Naomi. I practiced SMD soldering on the chassis. Even attempted to repair the traces by watching videos from @lukemorse1. But alas, can't save everything.
lukemorse1
Professional
Nice work man. I understand the feeling. I own 15 naomi 1 boards that I have repaired and Im still learning the multiple circuit problems they have. It makes for good practice and unfortunately you cant save them all.
Like you mentioned though, with 1 bad board sometimes you can fix 3 others with the parts.
Like you mentioned though, with 1 bad board sometimes you can fix 3 others with the parts.