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Laptop VGA to projector RCA Component problem

post #1 of 34
Thread Starter 
Hi,

I was told that a monoprice cable VGA to RCA could be used to connect my Toshiba laptop (Intel graphics) VGA port to the RCA component on my Infocus 4805 projector. Well I got one and made the connection, but I am not getting anything going to the projector. Can anyone help?
post #2 of 34
Well it appears that you were given some incorrect information.
RGB component which is a subset of VGA is not the same as YPrPb component used by TV or TV projectors such as your DLP projector e.ven though the cables used are the same. You would need a VGA to Yprpb transcoder to support you projector.
post #3 of 34
Quote:
Originally Posted by Taz123 View Post

Hi,

I was told that a monoprice cable VGA to RCA could be used to connect my Toshiba laptop (Intel graphics) VGA port to the RCA component on my Infocus 4805 projector. Well I got one and made the connection, but I am not getting anything going to the projector. Can anyone help?

What is the model number of the laptop? Some have component output and some don't.

If yours does support component output, you would probably need a special cable or adapter from Toshiba. If yours does not support component output, you would need a VGA transcoder, like walford mentioned.


Another alternative is to use a VGA to M1 cable:

http://store.infocus.com/escalate/st...2b6b:&tab=desc
post #4 of 34
Thread Starter 
I have a Toshiba Satellite M45-S331 laptop and the infocus 4805 projector. Do I need a transcoder to go from VGA laptop to RCA projector?
post #5 of 34
Quote:
Originally Posted by Taz123 View Post

I have a Toshiba Satellite M45-S331 laptop and the infocus 4805 projector. Do I need a transcoder to go from VGA laptop to RCA projector?

nope. you just bought the wrong cable. according to the infocus support website, the m1-da port supports an analog rgb connection:
http://www.infocus.com/support/Produ...rs/SP4805.aspx

this is the cable you need:
http://www.monoprice.com/products/pr...seq=1&format=2
post #6 of 34
Thread Starter 
I want o connect my laptop to the projector using the external VGA port and going to the projectors RCA component input. I don't want to use The M1-DA port on the projector, because I have a DVD player connected to that port already. The projector is ceiling mounted and I don't want to go through the hassle of switching cables all the time.
post #7 of 34
Quote:
Originally Posted by Taz123 View Post

I have a Toshiba Satellite M45-S331 laptop and the infocus 4805 projector. Do I need a transcoder to go from VGA laptop to RCA projector?

Yes. Your laptop does not support component output. Also, be aware that transcoding the signal will result in some loss of image quality. Using VGA to M1 would be better.
post #8 of 34
Thread Starter 
I bought a new laptop. A toshiba satelite A305. There is nothing in the documentation, how do I find out if it supports component output? I connected it (VGA to RGB) to the projector (4805) and nothing...

Thanks
post #9 of 34
Normally it wouldn't work that way - but in any event, I can't any mention anywhere that would indicate that it does have component output.
post #10 of 34
Thread Starter 
Ok, The specs on the laptop say it supports component video. I connected it to the 4805 with a VGA to RCA cable but nothing... Why doesn't it work?
Does running Windows Vista 64 have anything to do with it?

Tnx
post #11 of 34
Quote:
Originally Posted by Taz123 View Post

Ok, The specs on the laptop say it supports component video. I connected it to the 4805 with a VGA to RCA cable but nothing... Why doesn't it work?
Does running Windows Vista 64 have anything to do with it?

Tnx

I think your laptop supports composite video, Not component. this is out putted by the mini din connector on the laptop. the cable usually comes in the kit.
post #12 of 34
Use the s-video connection from your lappy and just be happy.

BT
post #13 of 34
Since your projector apparently supports YPrPb component normally used by TVs in will not accept RGB component which is what you get with a VGA to component adapter.
What is the Toshiba model number of your laptop?
If it supports YPrPb component it would not do so using the VGA connector most likely it would do so with a dongle connected to a MiniDin connector which looks like a S-video connection.
post #14 of 34
Quote:
Originally Posted by Taz123 View Post

Ok, The specs on the laptop say it supports component video. I connected it to the 4805 with a VGA to RCA cable but nothing... Why doesn't it work?

Because the laptop is outputting RGBHV, and the projector is expecting YPbPr, they're entirely different signals.

What you need, is a VGA to M1-A cable (or adapter), like this:
http://www.monoprice.com/products/pr...seq=1&format=2
post #15 of 34
Quote:


What you need, is a VGA to M1-A cable (or adapter), like this:

We tried that approach but he rejected it as he already has a dvd player connected using that input-
post #16 of 34
That's what I get for skimming

Is it an upconverting DVD Player? Or Blu-ray/HD DVD? Because if not, then that should be connected to the Component input (since the M1 connector gets you nothing on a normal DVD player).
post #17 of 34
His Tosh A305 has a 9pin MiniDin s-video connection. All he has to do is buy one of these, and his problem is solved.

Simple enough?

BT
post #18 of 34
Not if this is his laptop - I only count 4 pins...
post #19 of 34
Quote:
Originally Posted by rockytt View Post

Not if this is his laptop - I only count 4 pins...

If so, then he is stuck with running a straight s-video cable to his projector. The Infocus 4805 has an s-video connection on the back.

Or get the cable described in post# 5 by bgnome.

BT
post #20 of 34
Hi Taz123, I just wanted to confirm that:
1) you are trying to go VGA from laptop to component (red/green/blue) on 4805 - it sounded kind of like you were trying to plug into the 4805 via the single composite (yellow) jack...
2) Did you change the rez for your laptop to 720p or 1080?
3) Did you config your laptop for either dual monitors (laptop + PJ) or PJ only?

Otherwise, if you're still not getting a good handshake, you will probably have to settle for SVid from the laptop.

Another thing - I have an IF X1, which can accept 720p/1080i signals via (i) VGA or alternatively, (ii) Component-to-VGA adapter. I feed a DVD player (at 480p rez), PC (at whatever rez, doesn't seem to matter), and Comcast STB (at 1080i rez) to it via a receiver (which only takes component, not VGA). Something to think about for how you want to config everything...
post #21 of 34
Thread Starter 
Hello good people,

Thanks for all your assistance. What I am trying to do is to connect my laptop to my Infocus 4805 projector to get the best quality video, without using the DVI cable. I have a ceiling mounted projector that is connected to my DVD player with the DVI cable. I don't want the hassle of switching cables from the DVD player to the laptop each time, given the hard to reach nature of ceiling mounted projector. I was told (in this forum) that the best quality video (after DVI) was a VGA to RGB connection using a VGA to 3 RCA cable.

I purchased said cable and it is not working (VGA to red/green/blue). The laptop specification says that it has "RGB (monitor) output port". I am dumbfounded why this isn't working. That's the answer I am seeking.

I tried S-video connection and the video quality was noticeably inferior to the DVI and I suspect to the ellusive RGB, so that is not an option.

I have tried different resolutions, dual monitors, etc... This is a brand new Toshiba Satellite A-305 laptop, so I wouldn't believe that compatibility would be an issue.
post #22 of 34
Quote:


I was told (in this forum) that the best quality video (after DVI) was a VGA to RGB connection using a VGA to 3 RCA cable.

Actually, you've been told repeatedly in this thread that what you're trying to do won't work - As was explained in post #2

An "RGB monitor output port" is not component video and never will be no matter what cable you buy. However, a transcoder can take the RGB signal and convert it to (YPrPb) component as Walford explained way back as the answer to your very first post. I realize you're talking about a different laptop, but you're still trying to do the same thing with the same RGB connection and it's still not going to work.

What's wrong with doing what was suggested and move the DVD player over the component input on the projector and then use the M1 connector for the laptop?

(Btw-my buddy has the exact same laptop and there is no way that you're going to get component video out of it w/o a transcoder)
post #23 of 34
Yup, just reread the entire thread and there is no-one suggesting you buy the cable (VGA to red/green/blue) that you keep trying to use. I count 6 different people telling you that it won't work and yet you persist with the "This is a brand new Toshiba Satellite A-305 laptop, so I wouldn't believe that compatibility would be an issue."

Sorry for the mini-rant, but I think you need to take a step back and actually read what folks are telling you.
post #24 of 34
I think some users get confused by the fact that both RGB component and YprPb component use the same cables coded with R,G and B RCA connectors so they think that since their display has R,G and B RCA connecors for its YPrPb component input that it will also accept RGB component from a VGA to RGB component adapter.
post #25 of 34
Thread Starter 
Rockytt,

You're not telling me what I want to hear and thus your advice is invalid. Look here:

http://www.avsforum.com/avs-vb/showp...postcount=7645
post #26 of 34
Good luck then - maybe in another 7 months you'll get it...

You seem to have overlooked a critical part of the monoprice link that you posted:
Quote:


It can only function with a VGA port that is either able to recieve or transmit Component signals (Y, Pr, Pb)

I'm going to put this in caps, although I don't think that will make a difference

YOUR COMPUTER DOESN NOT TRANSMIT COMPONENT SIGNALS AND THEREFORE WILL NOT WORK WITH THIS OR ANY OTHER CABLE.
YOU EITHER NEED A TRANSCODER OR YOU NEED TO USE THE VGA TO M1-A CABLE AND USE THE INPUT YOUR DVD PLAYER IS CURRENTLY PARKED ON
post #27 of 34
Quote:
Originally Posted by Taz123 View Post

Rockytt,

You're not telling me what I want to hear and thus your advice is invalid. Look here:

http://www.avsforum.com/avs-vb/showp...postcount=7645

That post is wrong, or at least missleading. The adapter on the Infocus site is to go from component (eg from a DVD player) to a multi-use VGA/HD15 input on the projector.

Realize that that only works because the projector can be configured to expect YPbPr instead of RGBHV on that connector. The reverse however is not true, there's no way tell your laptop to output YPbPr on the HD15 connector so such a cable will not work in the reverse.

It's very simple, your laptop (probably all laptops) output RGBHV on the HD15 (VGA) connection, your projector expects YPbPr on the component input, the only way to get that to work is with a transcoder.

So, for the 3rd time, why can't you connect the DVD player to the Component input? That would free up the M1 connector for the PC. Being that it's a 480p projector I can see no benefit to connecting a DVD player to the M1 vs the Component input.
post #28 of 34
Thread Starter 
Arrrrrgh, this is not want I wanted to hear people. Going from DVD to projector means buying another cable, you can understand that I am cable shy at this point. I appreciate your good intentions though...

Where can I buy a transdoodad for around $20?
post #29 of 34
Quote:
Originally Posted by Taz123 View Post

Where can I buy a transdoodad for around $20?

You can't. Think more like $120 or more. And if you go that way, make sure you get a VGA to Component transcoder.
post #30 of 34
Like this

There are cheaper ones (as well as more expensive) but the cheap ones aren't worth a dime as picture quality is severely diminished. (I've thrown away a few myself trying to save a buck or two)
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