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5 Wire BNC to 3 Wire Component

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Old 01-27-2008, 06:18 PM   #1
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Default 5 Wire BNC to 3 Wire Component

I am hoping someone can help me. I recently was given an older rear projection TV set. It can display a full HD signal at 1080p,but the only HD video connection is a 5 wire BNC connection. The TV pre-dates HDMI.
Now my cable box and surround receiver only output video on a 3 wire component connection. I am trying to find a cable that will convert from the 3 wire component to a 5 wire BNC.
I have found a lot of 3wire to 3 wire and 5 wire to 5 wire, but no 5 wire to 3 wire.

I guess also I could use an HDMI to 5 wire BNC if they make such a thing.
Do I just use a 3 wire to 3 wire or will that not work?

Thanks in advance!!
Dangles
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Old 01-27-2008, 06:34 PM   #2
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There is not a cable. What you need is going to be a transcoder. The RGBVH 5 wire is also what VGA is. Key Digital is a good source for transcoders.
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Old 01-27-2008, 06:43 PM   #3
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Three of those 5 BNC's might also be able to be used directly for component input, depending on the set. It's a fairly common practice on professional video display equipment to allow 5-wire VGA connectivity (R, G, B, Horizontal sync, Vertical sync), 4-wire RGBS connectivity (R, G, B, composite sync), and three wire component (either R, G, B-type, with sync on the G channel, or consumer component Y, Pb, Pr-type) on combinations of those 5 BNC's.

Connect your Y component cable to the G connector, Pb to the B connector, and Pr to the R connector and see what happens. (You might need BNC male to RCA female adapters, check Radio Shack.) You might be surprised and get an image. Check also the set's menu to see if you have any input options for those connectors too.

If that doesn't work you'll need something called a scaler, which will convert the three wire Y Pb Pr component, to five wire VGA. I don't think the results will be worth the cost or the effort if it's an older set.
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Old 01-27-2008, 07:09 PM   #4
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Thanks guys, and I guess I couldn't use a 5 wire bnc to vga cable coupled to a vga to 3 wire component cable.

Basically this
a vga to 5 wire breakout cable
coupled to a
vga to 3 wire component breakout cable.
Thanks again!!
Dangles

Last edited by Dangles; 01-27-2008 at 07:16 PM.
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Old 01-28-2008, 08:55 AM   #5
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No because the 5 wire separates the Red, Green, Blue, Horiz sync, and Vertical sync on separate wires. The Y, Pb, Pr three wire has the H and V sync on the Y and the other two wires have the color difference signals. That is why you either need a transcoder or scaler to split out the signals to the 5 wires.

Like scoosdad said though, many sets with the RGBHV connections will have a menu selection to allow connecting the three component cables.
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Old 01-28-2008, 08:55 AM   #6
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No because the 5 wire separates the Red, Green, Blue, Horiz sync, and Vertical sync on separate wires. The Y, Pb, Pr three wire has the H and V sync on the Y and the other two wires have the color difference signals. That is why you either need a transcoder or scaler to split out the signals to the 5 wires.

Like scoosdad said though, many sets with the RGBHV connections will have a menu selection to allow connecting the three component cables.
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Old 01-28-2008, 03:25 PM   #7
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Default Help please, 5 wire RCA v 3 wire

I may be in the same situation. My contractor ran a 5 wire HD cable, specifically the Planet Waves RBB5HD wire in my walls of my new home. It has a blue, green, red, yellow and white cable. All of my components including the HD cable box, have the blue, green, red outputs for video (y, Pr & Pb) and the red and white for the audio outputs. I tried simply matching the colors and hooking up the tv but I get a mostly black and white screen with some reds and greens mixed in. Can someone help me? What can I do?
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Old 10-01-2008, 02:43 PM   #8
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hi im not sure if this is of subject but i have a princeton graphics
af3-ohd and am not sure if i hook up my hd charter cable box
to the vga via break out component or should i use the bnc to component what will be better
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Old 10-01-2008, 03:31 PM   #9
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If your Charter box has a VGA port (doubtful) then the VGA would be the same as using the 5 BNC connections. That's just a matter of what wire you have available.

More likely you have component video (YPrPb) outputs on the Charter box. If that is the case and you are saying you have a VGA component break out cable, that is probably the hook up you will need to use. There may be a menu selection to switch the input to component rather than RGBHV, which is what VGA actually is. If you hook it up and the picture is green then you need to switch to component.
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