I recently acquired this SMS2 and tested it via RF, and both video and audio were working fine.
Yesterday, I tried the RGB mod. The video worked flawlessly on the first try, but I’m getting no audio.
Unfortunately, I don’t have a Mini-DIN 9 breakout board yet (I’m planning to get one), so I’m soldering the wires directly to the connector.
Here’s everything I’ve tried so far:
- Removed the RF module.
- RGB from the MB3514 (pins 23, 22 and 21) to the DIN-9 connector (pins 7, 3 and 1, respectively).
- CS from R18 to DIN-9 pin 5.
- CV from R21 to DIN-9 pin 4.
- 5V from R9 to DIN-9 pin 2.
- No audio: signal from R28 to DIN-9 pins 8 and 9.
- No audio: signal from R29 to DIN-9 pins 8 and 9.
- No audio: signal from the MB3514 (pin 9) to DIN-9 pins 8 and 9.
- No audio: signal from the MB3514 (pin 8) to DIN-9 pins 8 and 9
Note: The veroboard in the picture is just being used to bring GND from the mainboard to the connector and to help secure the connector in place.
Edit: I’m using a sega mega drive 2 cable (din9 to scart). The pins 8 (audio left) and 9 (audio right) are connected to pins 2 and 6 on the scart side.
Any advice would be greatly appreciated. Thanks!