RGB Imput on 1985 Sony KV-25XBR Trinitron TV...what does it do? - diyAudio
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Old 26th January 2010, 03:40 AM   #1
form109 is offline form109  United States
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Default RGB Imput on 1985 Sony KV-25XBR Trinitron TV...what does it do?

Hello all.

i have this Wonderful Sony KV-25XBR Trinitron TV Manufactured in September,1985...which would make it a little over 25 Years old...and still functioning Perfectly...has an Excelent Picture,and Enough AV Imputs to Sastify my Needs.

what im Wondering is what that 34 Pin RGB Connector on the Back Does?

i know its supposed to connect to some AV Equipment but What?

will anything today connect to that?...i mean...cause its a 1985 TV so it might be abit outdated?

or is it still used today?
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Old 26th January 2010, 07:28 AM   #2
Enzo is offline Enzo  United States
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RGB - Red Green Blue.

Some systems usd the video broken down into the three basic color signals plus sync signals for vertical and horizontal. This is how most arcade game video monitors were wired. Most monitors in that industry accepted either positive or negative sync signals.

I couldn;t tell you what sorts of things spit out that sort of video for the consumer market. But that is what RGB is about.
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Old 26th January 2010, 09:08 AM   #3
dangus is offline dangus  Canada
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There was such a thing as "component" TV in the '80s, kind of a early stab at "home theater". A TV would consist of a monitor and a separate tuner box; the TV might have RGB as well as baseband and possibly chroma/luma inputs. IBM PC CGA cards would probably work with that RGB input, and RGB adapter cards were available for some other home computers. I have one in my ancient Apple ][+ clone. The nearly as ancient ATI EGA Wonder cards could do interlaced (=flicker) EGA onto CGA or TV monitors.

My boss owned a two piece Zenith, and I remember looking at a big one-piece RCA that had RGB on the back.

I believe that Sony Playstations have RGB out on the A/V connector, although finding a cable that implements that may be a challenge. Maybe a UK SCART cable does.

And, I'm fairly sure I had a DVD player with RGB as an output option.

Last edited by dangus; 26th January 2010 at 09:10 AM.
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Old 26th January 2010, 03:13 PM   #4
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Quote:
Originally Posted by form109 View Post
Hello all.

i have this Wonderful Sony KV-25XBR Trinitron TV Manufactured in September,1985...which would make it a little over 25 Years old...and still functioning Perfectly...has an Excelent Picture,and Enough AV Imputs to Sastify my Needs.

what im Wondering is what that 34 Pin RGB Connector on the Back Does?

i know its supposed to connect to some AV Equipment but What?

will anything today connect to that?...i mean...cause its a 1985 TV so it might be abit outdated?

or is it still used today?
Wow this is really strange. For no reason this morning I was recollecting to someone that I used order a complete service manual/schematic of every piece of AV gear that I bought. Yes this was SONY's first entry into high-end video. There was a companion piece T1100 component tuner with some very early high-end features. Unfortunately I've thrown away the schematics. This was as good as it got back then. I think you can DIY a simple Y-Pr-Pb to RGB board if you had the energy. I'm also not sure if sync on green was invented yet.
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Last edited by scott wurcer; 26th January 2010 at 03:18 PM.
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Old 16th September 2011, 08:17 PM   #5
CD-Dave is offline CD-Dave  Canada
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As the owner of two KV-25XBR's , I know the answer to this question: Sony made a little modular adapter for the mystery 34 pin connector you spotted on the back of your set. It actually worked to pass IBM-PC CGA video signals into the set via a quasi-RGB fashion. The model of the adapter was PC-701 ...there's one for sale right now on Ebay:

SONY PC-701 RGB INTERFACE ADAPTER | eBay

I own one of these and actually used it for awhile with an old PC...the quality was average
Dave
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Old 29th November 2011, 05:56 AM   #6
form109 is offline form109  United States
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Thanks for the information....i still have this TV unfortunately the right channel of the internal amp seems to have fried.
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Old 1st December 2011, 03:59 AM   #7
dangus is offline dangus  Canada
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That should be a relatively easy fix, if it's a common chip amp.
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