I looked on Ebay and found used Sony Handycam CCD-TRV98s for sale used.
I would guess that it uses a three conductor 3.5mm jack not a four conductor. I would also guess that a standard stereo jack could be tested swapping them into the RCA for video to determine which chanel is video.
Three conductors jacks share a common ground.
https://www.ebay.com/itm/3-foot-RCA-male-to-3-5-mm-stereo-jack-male-adapter-cable/143649030554?hash=...
I would guess that it uses a three conductor 3.5mm jack not a four conductor. I would also guess that a standard stereo jack could be tested swapping them into the RCA for video to determine which chanel is video.
Three conductors jacks share a common ground.
https://www.ebay.com/itm/3-foot-RCA-male-to-3-5-mm-stereo-jack-male-adapter-cable/143649030554?hash=...