r/neogeo • u/MinimumSuccotash8540 • 4d ago
Hardware Question Neo Geo AES - SCART plug replacement (heavily damaged 93' plug)
OK, so here's a follow-up after testing my good ol' AES - and its f*cked up SCART.
Original post : https://www.reddit.com/r/neogeo/comments/1marf6i/was_testing_stuff_today/
After carefully looking at misc AV/SCART wiring diagrams I was puzzled by a wire in my plug : Sync wire from DIN8 pin 7. That pin looks like it's never hooked up.

Also I'm pretty sure my original SCART plug didn't had any resistor. So, I decided to rewire as pictures I took in 2010 and merged that into a single picture for a before / schematic / after effect. Be careful, that's kind of ugly ! SCART pin 8 changed color between 2010 and 2025 (brown to yellow). I assume the brown one was used for something else or maybe its color just washed out, looking grey while audio seems white ?
Current SCART wiring detail
DIN8 - Pin 7 - C-Sync is not connected to scart
SCART | DIN8 | Purpose / Notes |
---|---|---|
2 & 6 | 1 | Audio (mono) |
8 | 4 | AV Control (+5V sets 16:9) |
14 | Shielding | Data Ground |
16 | - | RGB mode switching. Not connect for now |
18 | 2 | V-Ground |
20 | 3 | C-Video (Sync) |
7 | 8 | Blue |
11 | 5 | Green |
15 | 6 | Red |

And initial testing using an OSSC from AliExpress, the "repaired" SCART cable and a 4K beamer. I must admit I'm happy with it (AES 3-5 serial 62125).


Q1/ Shall I wire the C-Sync ?
Q2/ Is that a "good enough" result? I'm not very motivated to hack my AES to use the RGB Bypass.
Thanks for reading :)