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-   -   3 x BNC VGA = Component Video ??? (http://www.diyaudio.com/forums/parts/72927-3-x-bnc-vga-component-video.html)

Mikael Abdellah 30th January 2006 10:52 AM

3 x BNC VGA = Component Video ???
 
There are some old VGA systems that only used 3 BNC connetors for signal. Is this system compatible with the modern component video? I have a big CRT monitor with a VGA input (both MAC and "normal" VGA) and I would like to use my DVD players component output. Do you think it's possible? I KNOW that my monitor can be driven with sync-on-green but that still leaves me one connector short.

Nigel Goodwin 30th January 2006 03:33 PM

It's unlikely, the three BNC's will most likely be RGB - also a VGA monitor runs at a completely different frequency to a normal vido signal (as from a DVD player).

Mikael Abdellah 30th January 2006 03:48 PM

first of all... this isn't your everyday philips 17" crt monitor. It's a 29" Panasonic Professional broadcast monitor for video editing and such. I have just tried to hook it up via a regular 5 BNC cable of wich I simply connected the red green and blu coax to the same color coded component video connector. oh... my... god.... i have never seen such amazing picture. the blacks are pitch black, and the picture sharpness is not of this world. but there is one problem. i'm missing the red channel :(

This does however proove that the component video signal is the same as an ordinary VGA with sync on green. Any ideas as to how I should get the red channel too?

Mikael Abdellah 30th January 2006 03:59 PM

correction.... the red channel seem to be there but it's almost non-existant. when i was browsing through the menus I noticed a dark brown dot that i think is supposed to be bright red. Do you think it's possible to get it to work properly?

pinkmouse 30th January 2006 05:29 PM

Swap red and green, to see if the fault is with your cable or the monitor.

Mikael Abdellah 30th January 2006 06:56 PM

Since the sync need to be on green channel the monitor shuts down if i try to switch. I have been looking at some component to rgb converters, but they seem to convert the image to a vga resolution and something that i do NOT want. I only need the colors right.

dnsey 30th January 2006 07:24 PM

As it's a pro monitor, you will probably be able to dial up a test picture from the menu. How does that look?
If the red's still down, chances are that the red gun of the tube is failing - red always seems to go first!

pinkmouse 30th January 2006 07:28 PM

Swap red and blue then. ;)

Mikael Abdellah 30th January 2006 07:59 PM

when i use the composite input or a regular vga signal from a computer the picture is ok so there is nothing wrong with the monitor. the question really is: how different is a component video signal from a vga signal and will the monitor work properly with RGB and just one sync signal. Right now I get the sync on top of the (normally) grenn signal but since component video has sync and luminance on the green connctor the monitor interprets the luminance as green color signal since i feed it on that input.

dnsey 30th January 2006 09:48 PM

It's no great problem to make a sync seperator, but you can't swap RGB for UV (luma, chroma) signals.


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