Hey folks,
If you have dead Sega Naomi stuff, you have options...
#1: Check the Memory Backup Capacitor. It leaks and will eat traces around it, including under the 8 pin EEPROM. Clean up the mess, replace the 8 pin socket, make sure the pins are clean on the chip, and repair any dead traces. Install a new supercap.
#2: Bad IC29. It's not the IC in 95+% of the cases. Check for eaten traces around the supercap and patch as needed.
#3: Carts that are intermittent. Work sometimes, not other times. Replace the surface mount bus buffers. There are quite a few and there's no easy way to tell which one(s) are bad so just do 'em all. Quit running the Naomi at >5.1v and you'll quit frying buffer chips.
#4: My GD-ROM tries but won't read discs. Replace the laser assembly. You can find it as close as your nearest Dreamcast. Don't have one? Find it on eBay or CL. Sell the control board to someone who pulled a #5 and recoup your DC costs.
#5: My GD-ROM is fooked because I plugged the wrong cable in and put +12v on the +5v line. Well, why did you do that? If you have the 610-0617 version of the GD-ROM then the control board is the same as the one in the Dreamcast. Replace it and you'll be good to go. The laser shouldn't be affected. Keep the DC laser for later if you need it, or sell it and recoup the cost of the DC.
Enjoy!
RJ
PS: Repair stuff like this is in my repair logs. Check my signature block.
If you have dead Sega Naomi stuff, you have options...
#1: Check the Memory Backup Capacitor. It leaks and will eat traces around it, including under the 8 pin EEPROM. Clean up the mess, replace the 8 pin socket, make sure the pins are clean on the chip, and repair any dead traces. Install a new supercap.
#2: Bad IC29. It's not the IC in 95+% of the cases. Check for eaten traces around the supercap and patch as needed.
#3: Carts that are intermittent. Work sometimes, not other times. Replace the surface mount bus buffers. There are quite a few and there's no easy way to tell which one(s) are bad so just do 'em all. Quit running the Naomi at >5.1v and you'll quit frying buffer chips.
#4: My GD-ROM tries but won't read discs. Replace the laser assembly. You can find it as close as your nearest Dreamcast. Don't have one? Find it on eBay or CL. Sell the control board to someone who pulled a #5 and recoup your DC costs.
#5: My GD-ROM is fooked because I plugged the wrong cable in and put +12v on the +5v line. Well, why did you do that? If you have the 610-0617 version of the GD-ROM then the control board is the same as the one in the Dreamcast. Replace it and you'll be good to go. The laser shouldn't be affected. Keep the DC laser for later if you need it, or sell it and recoup the cost of the DC.
Enjoy!
RJ
PS: Repair stuff like this is in my repair logs. Check my signature block.

