Sync question on RGB Modded KV-35S45

[kwd114]

Hello all,

Currently working on RGB modding my Sony CRT KV-35S45 and my plan is to add an external SCART connector as I already own quite a few cables for my retro consoles. My question is most of my cables are Csync which I understand I need to feed pin 20 from the scart connector to the RCA in on the tv for a sync signal. My question is that my Playstation cables are sync on luma. Can that also be fed into the composite connector or do I have to feed that into the s-video connection? If that is the case I am assuming I can add a switch to be able to direct the sync to were it need to go based on the cable I have attached.

Thanks for the help!

[Ryeno]

Hello all,

Currently working on RGB modding my Sony CRT KV-35S45 and my plan is to add an external SCART connector as I already own quite a few cables for my retro consoles. My question is most of my cables are Csync which I understand I need to feed pin 20 from the scart connector to the RCA in on the tv for a sync signal. My question is that my Playstation cables are sync on luma. Can that also be fed into the composite connector or do I have to feed that into the s-video connection? If that is the case I am assuming I can add a switch to be able to direct the sync to were it need to go based on the cable I have attached.

Thanks for the help!

You should feed the sync into S-video luma rather than composite on most Sony TVs because some TVs shift the horizontal position. You need to add a jumper between the top and bottom pin of the S-Video jack to enable the input but if you do this you'll lose the ability to use composite on that input; which generally isn't a big deal. The other option is to add a switch to manually select between the composite and s-video jack; I never do this because there are other composite inputs and I never plan to use composite anyways.

[kwd114]

Ok that definitely sounds like a better option. So it sounds as I can feed either the Csync or sync on luma into the luminance pin on the svideo. Like you said I dont mind losing the composite input on the line as there is already a second one. When you say jumper, are you referring to the chrominance and chrominance ground?

[kwd114]

Never mind. I believe I figured out what you were saying. The top and bottom pin just complete the ground sense loop which tells the set that a plug is "technically" plugged in so it looks for the sync there.

[tongshadow]

Funnily enough most TVs arent picky about sync at all, in contrast to most expensive BVMs.

[kwd114]

Thats honestly what I believed as well and I was just over complicating it in my head.

[Ryeno]

Never mind. I believe I figured out what you were saying. The top and bottom pin just complete the ground sense loop which tells the set that a plug is "technically" plugged in so it looks for the sync there.

correct

you can see the jumper and the yellow sync wire in this picture

https://i.imgur.com/6mlw0wS.jpg