Hello, all, hope everyone had a happy Christmas/holidays. I managed to get all the components I needed including the Extron 160x. The audio was ridiculously easy to get duplexed out, so thanks for that. I'm now ready to finish this up, but I wanted to get your input as to whether I am barking up the wrong tree with video cabling.
So.
When I looked at my machine and how Sega decided to get the video signal out from CN7, I noticed they had a normal 5-pin JST-NH connector. However, instead of going straight to the neckboard as 5 pins, they split the cabling with a coupler halfway to the neckboard by bunching RGB on its own, and the H/V on its own (both in the middle). At the neckboard, it then recombines into a normal 5-pin. So it goes 5 pin > 3 pin/2 pin split > recombine at 5 pin at the termination point. (In this diagram what is in the yellow box is what Sega did.
I don't want to get too close to the neckboard given its uncomfortable proximity to the flyback, so I am trying to T this in the simplest way I can while maintaining the signal path as much as possible without tearing too much apart.
My thoughts were to unseat the female JST-NH video cable from CN7 from the board that runs to the monitor, then create a new female JST-NH Y-cable of sorts by T-ing the R, G, B, H, and V cables. The base of the T would be of course crimped and seated in the 5 pin JST-NH female connector, which would be reseated into CN7. The connecting ends of my doubled-up T would go to the corresponding pins on my VGA terminal block to go to the OSSC, and the other ends would be fashioned into a 5-pin male JST-NH. This would then connect to the existing JST-NH female cable that was originally seated directly into CN7. Something like this:
My thoughts/hope is that with a simple Y-splitter like this, the monitor is still getting exactly what it needs from the board without interference as in theory it is not getting more voltage injected into it. The part that goes into the Extron is the only part needing any sort of voltage boost to get a line level signal to the OSSC and consequently the capture card.
(If I should solder the T-ed base before crimping to improve signal flow, let me know - and what kind of solder if so)
I have T-ed lots of cables before, but not this particular kind of video cable, so if this method of splitting the signal per this diagram is completely barmy, let me know.
It would be my first time, hence the mix of stupid questions with the odd flash of general competence.
Would welcome your thoughts as I am quite excited to soon be able to get this working
