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Sega naomi installed with netboot raspberry pi but no visuals

k1701

k1701

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Hello everyone, l just installed a sega naomi 1 with netboot raspberry pi mod.The board appears to be functional,voltage is within norms,the raspberry pi is functional ,l am seeing the lcd screen on the pi fired up with the options to scroll and select game to flash to the netboot dimm.There is no visual, the lcd screen connected to the vga out installed boots up with the acer monitor logo then goes to blank with a no signal error.
I researched online, and came to some conclusions, nothing is wrong with the board physically, but the board doesnt like the lcd monitor or vice versa.Given the age of the naomi itself , it doesn't display on modern monitors, but older lcd screens or CRT monitors.
From what l gathered ,
1.l can find a older lcd monitor from the early 00s or
2.Use a RGB to VGA adapter to convert the RGB signals from the jamma harness to a signal the lcd monitor will possibly accept(l have used the same adapter for my neogeo MVS 1 slot and my CPS2 board with no issues)

What do you guys think?Are there other workarounds? Would using the RGB to VGA adapter resolve the issue?
Thanks in advance for any insights!
 
Hey,thanks for the response, l confirm all 4 dip switches on the naomi board are on the off position (on the down position ) once DIP 1 is off it is 31khz so most displays will accept
kikaso said:
Have you confirmed video out is set to 31khz?
Click to expand...
 
I have answered you on another forum, but to echo my reply for next steps after you confirmed all DIPs are off:

So not to confuse you further, but VGA is RGB, just at a higher refresh rate. You might have to flip DIP1 on the NAOMI to get 15k RGB in order for your adapter to upscale it back to 480p VGA which is not ideal at all. We just want to pull 480P VGA right from the NAOMI :)

pin 9 is the one in question, but if it caused an issue with your display and cable, something would probably be quite obviously wrong https://www.arcade-projects.com/threads/repair-log-sega-naomi.456/page-3#post-118230

To be completely safe moving forward you need a cable missing pin 9 especially if you're going to try any different displays:
https://www.amazon.com/Tripp-Lite-M...cable&qid=1638211632&qsid=134-9061295-7614224

Failing that my next personal step would be a sync stabilizer like the extron SS-200, but it's BNC so you would need VGA->BNC adapters/cables for this particular device
Click to expand...
 
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