Cable Building DB25->BNC for PVM-2030

[vol.2]

So I want to build a cable to go from my Extron 203 to my PVM-2030. The 2030 has a DB25 input, and the Extron has BNC out. What I was going to do is buy a BNC to DE15 (VGA) cable and cut off the DE15 connector, strip the ends, and solder it onto a DB25 connector in the correct places.
Page 17 of the below PDF shows the pin-in of the DB25 to the 2030, and the Extron 203 has the ability to output as whatever sync I want it to. The 2030 manual has different input options, I beleive that it accepts TTL as well as sync via luma, composite sync or sync on green. Also, if someone can confirm what I should do with the outer BNC wires, that would be good. Currently, I believe that I should make the outer contact from the BNC go to a ground pin on the DB25 connector. There are plenty available. (pins 15-24)
Can anyone recommend an optimal path solution for this build?

PVM-2030 manual w/ DB25 pin assignment on page 17:

Spoiler

https://docs.sony.com/release/PVM2030.pdf

[mvsfan]

well in most cases ground is ground is ground.

yeah the outer sheild gets connected to ground in the db25.

sometimes you have to leave one end of a cable open to avoid audio interference but not in the case of your pvm.

that happened to me when i built a component snes. the audio is going through one cable and video through another and i was getting awful audio buzzing until i left the sheild on one end of the audio cable disconnected.

[vol.2]

well in most cases ground is ground is ground.

yeah the outer sheild gets connected to ground in the db25.

sometimes you have to leave one end of a cable open to avoid audio interference but not in the case of your pvm.

that happened to me when i built a component snes. the audio is going through one cable and video through another and i was getting awful audio buzzing until i left the sheild on one end of the audio cable disconnected.

thanks for your input. I believe that your audio issue sounds like a balanced/unbalanced issue. that is to say that you were getting a balanced audio signal (i'm assuming you were coming from an extron) and putting it into an unbalanced amp by combining the cold sides of the L/R. Just a guess though...

edit: changed "low sides" to "cold sides"

[mvsfan]

actually no. i was going straight to my tv.

[vol.2]

hmmm. Maybe just a ground loop somehow. What reason do you believe that I won't have the same issue with my PVM?

[mvsfan]

if it was a ground loop it should be solved by using 1 single cable instead of 2 parallel cables.

with my snes Im using the multiout for audio only. 2 cables.

[vol.2]

if it was a ground loop it should be solved by using 1 single cable instead of 2 parallel cables.

with my snes Im using the multiout for audio only. 2 cables.

Hmm. Do I need to populate all 10 ground pins on the DB25 connector?