The NEW Build Your Own Arcade Controls
Arcade Collecting => Restorations & repair => Topic started by: paultje162 on April 17, 2019, 02:40:17 pm
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Hello Everyone!
I just recently got into Arcade's and bought two defective Sega Naomi boards. I get it, now you're wondering, WHY did you buy defective ones? Well that is a good question, I'm a console collector that only collects defective consoles and fixes them. So far i have over 25 consoles in my collection that are all back in fully working order, and i would love to continue that with the Arcades to preserve these wonderful machines. But now back to the Naomi's:
One of them is now succesfully booting but i still have some issues to solve. The board is currently starting up with a green screen, slowly transitioning to the Naomi Logo and flickering like crazy(Error 01 can be ignored, booted it without a game). The boards came in pretty rusty but that's all cleaned up and all solder points are in good shape. No damaged traces or corrosion. Anyone had this exact issue and can tell me what fixed it for them? Or do you guys have any clue where to look for? Test and Service are both not responding when clicked on the board. It once tried to boot Test mode but kept rebooting.
Video:
https://youtu.be/nrW10BV2a3o
The second one is just completely black on boot. No video or audio at all. I currently ordered some KR-5R5H104-R caps to replace the old EECS0HD104H capacitor. That one seemed to have leaked but did not damage any traces yet. This machine was also rusty but that's all cleaned up now. I did find a thread about troubleshooting the naomi black screen (This one). I tried the following of that:
-Bios Corrupt or not present (Can't test this yet. I don't have the proper tool to extract the bios chip from the board)
-Fixed CPU had more particularly to the BGA (rare as on the N1) (I don't really get what they are trying to tell me with this one)
-supercap (a change or which sank) (Ordered, will come in in a few days)
-GPU Fan not working (GPU fan spins like a champ)
Many thanks already!
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Managed to get a little further then before. Replaced the JVS board and now my test and service buttons work. Test mode is very unstable though and crashed 99% of the time. I did manage to do the RAM test once and got this far. Looks like i need to change some chips!
(https://i.gyazo.com/f57422d50e3095b95425f5c3bd887cac.jpg)