CXA Video Encoder (Neo Geo AES)
The video encoding for generating composite and RGB video data from the LSPC chip is the CXA1145 video encoder.
The CXA1145 is a super common encoder found on many retro consoles.
Look for it near the AV port on your Neo Geo, and here are the pinouts.
The CXA1145 slightly amplifies the input RGB signals by around 40%. As an example, a blue in signal pulsing at 0.66V will output at 0.93V.