I have one of the early iterations of the Neo Geo AES that on bootup only shows a black screen and was previously mute.
Bit of a long shot but does anyone around here know if pin 126 of the LSPC-A0 chip should be showing 5 ohms of resistance to ground? On replacing the CXA1145 video encoder chip, I can now get sound but still no video, and I measured csync input at 0.4 volts which seems kind of low for what pin 10 of the CXA1145 is expecting.