From: Paul on 15 Dec 2005 05:52 In article <439ff03f$0$11073$e4fe514c(a)news.xs4all.nl>, "KJ" <iemand(a)microsoft.com> wrote: > > Yes, i found the same posting of this Fred guy. But i would say that it is > NOT a 'mirror' question. Because in his example the opposite to pin1 (gnd) > is alway the composite, no matter how you look at it. The only mix up he > could have made is the pin numbering i think. So pin6 = pin2 > > Would you have any idea if it could harm to just test it? I would first go > for pin1 & pin2, being a composite signal. Test it on a TV screen. If it is > not the composite but a s-video signal it will not hurt my tv, won't it? And > the same for mixing up S-video with composite.... OK. I'm don't know too much about TV signals, but I'm willing to learn :-) Here is a key posting, that may help us. The post at the bottom in particular. http://episteme.arstechnica.com/6/ubb.x?a=tpc&s=50009562&f=67909965&m=1460994923 I have one of those S-Video (4 pin) to RCA adapters. The poster on arstechnica, says the luminance and Chrominance are connected together with a capacitor, and with my multimeter, I do indeed find a 0.0033 uF capacitor between them. I also find the luminance signal tied directly to the center pin of the RCA connector on the other end. Based on understanding how that adapter works, here is what I expect will happen: 1) Composite - If you connect this to the TV, it has three key components that make the TV work. The composite signal has "sync" mixed with it. The "sync tips" are parts of the signal that go below zero volts - that is sometimes referred to as "blacker than black". The TV cannot lock to the composite signal, unless the TV can lock to the vertical and horizontal sync component in the composite signal. The composite signal has both luminance and chrominance info. Luminance is the brightness, and in a sense, it could be considered a "black n' white" signal. The chrominance carries some kind of color signal. It could be phase encoded info, but since I cannot find any pictures on the 'net, of what the signals are supposed to look like, I'm not sure about that. 2) Luminance - If you connect this to the TV by accident, my guess would be, that the luminance signal has "sync tips", so the TV should be able to lock to it. I would expect to see a black n' white signal on the TV set, accompanied perhaps by very bad color fringing. 3) Chrominance - This likely has no sync mixed with it, so the TV should not be able to do anything with this. The filtering circuitry in the TV will be able to separate the chroma info, but the luminance component coming from the filtering will be zero volts, so the picture tube should be black. Without a sync component in the signal, the TV picture may roll, or if this is a modern TV set, the TV may indicate a "no-signal" condition. I think the reference color burst is also missing at the beginning of a display line. My guess is, you'll be able to tell the difference between the three signals. Composite will look good. Luminance will give a monochrome picture. Chrominance shouldn't give anything visual, as near as I can figure. Good luck :-) Paul
From: fred on 17 Dec 2005 08:04 In article <439ff03f$0$11073$e4fe514c(a)news.xs4all.nl>, KJ <iemand(a)microsoft.com> writes > >Yes, i found the same posting of this Fred guy. But i would say that it is >NOT a 'mirror' question. Because in his example the opposite to pin1 (gnd) >is alway the composite, no matter how you look at it. The only mix up he >could have made is the pin numbering i think. So pin6 = pin2 > >Would you have any idea if it could harm to just test it? I would first go >for pin1 & pin2, being a composite signal. Test it on a TV screen. If it is >not the composite but a s-video signal it will not hurt my tv, won't it? And >the same for mixing up S-video with composite.... You're right, the pinout I gave was not mirrored and was of the header. From memory I got it from a manual and then confirmed it by inspection & buzzing out the faceplate board that came with my A7N8X mobo, the header on the mobo should be one-to-one for this as it is connected via a one-to-one ribbon. You should be able to get it first time by looking at the pinout I posted but it is pretty difficult to do harm as the grounds are ground and video signals always have a 75ohm terminator in series so accidentally shorting them to ground (but not any other rail) should not cause any damage. As I think Paul has advised, you usually need to make your TV connection first, then boot/reboot for the board/driver to activate the TV out. You might be able to make it 'always-on' somewhere in the nvidia setup but can't remember. HTH -- fred Plusnet - I hope you like vanilla
From: KJ on 21 Dec 2005 06:58 "fred" <not(a)for.mail> schreef in bericht news:FIShOIAOyApDFw+S(a)y.z... > In article <439ff03f$0$11073$e4fe514c(a)news.xs4all.nl>, KJ > <iemand(a)microsoft.com> writes >> >>Yes, i found the same posting of this Fred guy. But i would say that it is >>NOT a 'mirror' question. Because in his example the opposite to pin1 (gnd) >>is alway the composite, no matter how you look at it. The only mix up he >>could have made is the pin numbering i think. So pin6 = pin2 >> >>Would you have any idea if it could harm to just test it? I would first go >>for pin1 & pin2, being a composite signal. Test it on a TV screen. If it >>is >>not the composite but a s-video signal it will not hurt my tv, won't it? >>And >>the same for mixing up S-video with composite.... > > You're right, the pinout I gave was not mirrored and was of the header. > From memory I got it from a manual and then confirmed it by inspection & > buzzing out the faceplate board that came with my A7N8X mobo, the > header on the mobo should be one-to-one for this as it is connected via a > one-to-one ribbon. > > You should be able to get it first time by looking at the pinout I posted > but > it is pretty difficult to do harm as the grounds are ground and video > signals > always have a 75ohm terminator in series so accidentally shorting them to > ground (but not any other rail) should not cause any damage. > > As I think Paul has advised, you usually need to make your TV connection > first, then boot/reboot for the board/driver to activate the TV out. You > might > be able to make it 'always-on' somewhere in the nvidia setup but can't > remember. > > HTH > -- > fred > Plusnet - I hope you like vanilla Thanks! I found out the pin/header layout for the TV_OUT connector/header on the Asus P4R800-VM (and perhaps other asus boards as well). There is a TV out header/connector on this board, but there's no description available. I've been testing and found it out. Now with only a cinch/rca or better a s-vhs/s-video female chassis part, one can create a cheap tv out. Asus sells the AV/S brackets but they are rare and more expensive. Here it is: 5 1 |* *| |* * *| ------- pin1= GND pin2=composite signal pin3=is emtpy/not used pin4=S-video/s-vhs C(chroma) pin5= GND pin6= S-video/s-vhs Y(Luma)
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