Hello! I recently got myself a Japanese Neo Geo CD system but to my disappointment when I turn it on I get no audio or video signal. It will spin games when the lid is closed. I researched that it could potentially be the Sony RGB chip but this only seems to cover the video side of it, whilst I still get no audio signal at all. A quick inspection of the PSU / daughter board of the unit shows no bad capacitors or funny smells either. It may be a long shot, but the AC adapter had a bent prong for the wall socket which I had to gently yet forcefully adjust back in to place. Is it possible it may be damaged and the unit isn't receiving the 12v / 5v? Thanks!
Ryan, get a multi meter and verify if your getting both voltages across the points on the ac adapter and to the power board. then work from there.
The AC adapter was giving slightly suspicious voltages across the lines but nothing too sinister. Turns out an inductor powering the RGB encoder was dead so one of the encoder chips pins wasn't receiving 5v. We made a temporary bridge to see if that brought it to life and we got audio visual!
