It could be that the nVidia 7-pin is not the same as your connector. Can you identify if your cable is just that, or is it a signal adaptor?
As far as I understand, it's possible the 7-pin output from your Card has a Composite output as well (pins 3&4), it might be worthwhile "buzzing out" using a multimeter the connections on your cable to identify which pin goes to which.

Bruce S.

_________________
Updated 2019/10/26: AthlonII X2 265 Gigabyte GA-970A-DS3P
16Gb PC 1866 DDR3, 500GB+2TB+4TB SATA HDD,
SATA DVD-RW Asus DRW-24D5MT , NVIDIA GeForce GT1080
Hauppauage Nova-T 500, Nova-T LinHes R8.6.1

That's pretty much what I'm assuming...though I have no clue what or how to test it.

_________________
"The amount of time needed to solve a problem is inversely proportionate to the complexity of the solution" -- Me

KM: R5.5
CPU: Athlon 3800+
Vid: nvidia 7300GT
Snd: Chaintech av-710
Tuner: PVR150
HD: 1000gb sata + 750gb sata + 500gb usb

I'll reply in your other thread.

Bruce S.

_________________
Updated 2019/10/26: AthlonII X2 265 Gigabyte GA-970A-DS3P
16Gb PC 1866 DDR3, 500GB+2TB+4TB SATA HDD,
SATA DVD-RW Asus DRW-24D5MT , NVIDIA GeForce GT1080
Hauppauage Nova-T 500, Nova-T LinHes R8.6.1