What a rats nest.
Removed the RF box and PCB.
I removed some of the solder mask with a fibreglass pen so I can solder the new connector to the pcb at an angle.
Mega Drive 2 video connector fitted.
I should have used a larger connector but since the original was missing I decided to use this one that I had on hand. I also like the idea of being able to use a standard Mega Drive 2 scart lead and not have to make a custom cable.
I installed a THS7314 video amplifier inside the system which I have covered before so won't go over again.
After I tested that it worked as it should I put it back together and then decided to check if C162 should be populated which I should have done before I put it back together, as it turns out it should be. It was so cleanly removed it didn't occur to me that a cap should be there, but a google search told me that C162 is a 470uf 16 capacitor.
There wasn't room to install it in it's original position so I hot glued it to the pcb where there was space and ran two wires to the two pads.