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How to get rid of VGA ghosting problem

downloaderfan

By downloaderfan
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downloaderfan

downloaderfan

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Very recently i came to know about the various cables that can be used to connect ur laptop to ur tv.However i found out that there was only one vga port on my laptop and also my lcd tv,so i had to buy a vga to vga cable(about 1m long),however i am finding transparent ghost images produced by the cable and im sure its not the monitor or tv.So i searched for the solution everywhere on the internet and the only thing i could find is keeping the cable away from other wires and reducing electromagnetic interference.This sure reduced its effect to a minimal level but i was wondering whether there is a way to totally remove this ghosting effect?Would a vgi to hdmi converted give me a perfect result?Or is there something else i can do?I am ready to spend a few bucks for the perfect picture.i also know about the ferrite coated cables but not sure whether it would be the PERFECT solution.

 

Heres info about my laptop

 

Compaq Presario CQ56-206SA Notebook PC Product Specifications Compaq Presario CQ56-206SA Notebook PC - HP Customer Care (United States - English)

 

my tv has 3 hdmi ports,2 usb ports and a vga port

ZeroHour

ZeroHour

Posted
Posted

The VGA port you have is possibly analogue only which means you would need to get a powered converter to transform the signal to digital to be fed to the TV. If your VGA is digital output then you can convert using a dongle and that could remove the ghosting issue I *think*

Could you possibly post a picture of the ghosting effect?

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downloaderfan

downloaderfan

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The VGA port you have is possibly analogue only which means you would need to get a powered converter to transform the signal to digital to be fed to the TV. If your VGA is digital output then you can convert using a dongle and that could remove the ghosting issue I *think*

Could you possibly post a picture of the ghosting effect?

 

Thanks for the quick reply,ZeroHour the two images i have posted below are not mine but they look similar to the issue im facing here,so u should get an idea of how images look on my tv

 

http://img368.imageshack.us/img368/344/2916678279901254590st1.jpg

http://img364.imageshack.us/img364/1645/2916679809901260170xo1.jpg

 

and i agree with arthur,there is no digital vga,its only analogue

 

BTW by a powered converted do u mean a vga to hdmi converter?I dont much about this stuff,but i just watched a video on youtube about how a vga to hdmi converter looks,it requires a vga cable as well as an hdmi cable,so im worried about the ghosting effect not disappearing as first the vga cable would transfer the analogue electronic signals with a little bit of ghosting effect to the converter and that would be converted to digital by the converter and displayed on my tv screen.

 

Can it happen?Or is it something silly to think about?

Edited by downloaderfan
Guest Guest

Guest Guest

Posted
Posted
You using a cheap VGA cable? Mind at 1m long it would have to be really bloody cheap to cause that (I have seen cables that cheap mind but rarely).
downloaderfan

downloaderfan

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You using a cheap VGA cable? Mind at 1m long it would have to be really bloody cheap to cause that (I have seen cables that cheap mind but rarely).

 

well,the shop i went didnt have much variety in these cables so i really dont know the rates,but i do think its cheap..but some adjustments in the wire and the ghost imaging is almost gone but still visible,would the costlier ones be that perfect?

downloaderfan

downloaderfan

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There are several solutions to this - buy shielded/gold plated VGA cable and secondly, use a powered VGA splitter. This does make all the difference.

 

What is a powered vga splitter?Is this one of them?

http://www.thewebsqueeze.com/wp-content/uploads/2009/08/splitter.jpg

My laptop and tv both have only one vga port...I really tried searching more about powered vga splitter over the internet but not getting much information about it..How would it help?

Arthur

Arthur

Posted
Posted (edited)
What is a powered vga splitter?

Powered VGA splitters look like the box shown below (they are sometimes called "VGA boosters" too). If you search for "350MHz VGA Splitter" you should be able to find somewhere that sells one in India.

 

http://i.imgur.com/3RqKm.jpg

 

How would it help?

In your case, you would only be using the splitter as a way to boost the VGA signal, rather than to show things on two displays. You will also need two VGA cables - one to connect the PC to the splitter (VGA In) and another to go from the splitter to the TV (VGA Out).

 

I often use powered splitters when I need to connect a laptop up to a projector that has a 10m-15m VGA cable. Without the splitter/booster, the laptop will either not display anything on the projector or the image will be distorted in some way.

 

Personally, I would try a different VGA cable first since the distance between your PC and TV is really short.

Edited by Arthur
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downloaderfan

downloaderfan

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thanks a lot arthur,michael,j17sparky and zerohour...

 

I would buy a buy a seperate gold plated vga cable first as mentioned by michael,and then if the ghosting still appears i would buy a vga splitter...however considering the words used by j17sparky,it seems that a costlier one wouldnt give me any effect at all at such a short distance...i hope that now my videos would just look the way they looked when i played them through usb...thanks a lot again..

 

btw just to mention,this is first time i have ever joined a forum to solve my problems and the result i got was quick and tremendous,im looking forward to sharing the little knowledge i have about computers and at the same time learning more about how stuff work...

 

Keep up the good work...

synaesthesia

synaesthesia

Posted
Posted

We've been getting ghosting with a lot of older machines that have unpowered VGA splitters (Y-Cables). Rather than go down the route of a fully powered splitter which takes up a mains socket we've had very good results with USB powered ones.

http://www.amazon.co.uk/StarTech-Port-VGA-Video-Splitter/dp/B000YB2HEM/ref=sr_1_1?ie=UTF8&qid=1348754755&sr=8-1

 

I also find that some newer laptops seem to react worse than older ones with these and often won't display an image at all - I wonder if it's down to the expectations of TFT screens rather than CRT.

downloaderfan

downloaderfan

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We've been getting ghosting with a lot of older machines that have unpowered VGA splitters (Y-Cables). Rather than go down the route of a fully powered splitter which takes up a mains socket we've had very good results with USB powered ones.

http://www.amazon.co.uk/StarTech-Port-VGA-Video-Splitter/dp/B000YB2HEM/ref=sr_1_1?ie=UTF8&qid=1348754755&sr=8-1

 

I also find that some newer laptops seem to react worse than older ones with these and often won't display an image at all - I wonder if it's down to the expectations of TFT screens rather than CRT.

 

ok now,would i really need a vga powered splitter or usb powered vga splitter for a short distance of only 1m?Cuz considering the range of the power products i find on the internet(about 20-30m and sometimes even more),1m is too short...

Marc-Engineer

Marc-Engineer

Posted
Posted

It is down to the quality of the cable good leads are screened and then also the individual video and sync wires are screened again you would have no problem with a lead like this for up to 50 Mtrs make sure your lead had the wrap around ferrite core at each end within one inch of the VGA plug.

 

Marc

Projector Engineer

downloaderfan

downloaderfan

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It is down to the quality of the cable good leads are screened and then also the individual video and sync wires are screened again you would have no problem with a lead like this for up to 50 Mtrs make sure your lead had the wrap around ferrite core at each end within one inch of the VGA plug.

 

Marc

Projector Engineer

 

ok thanks marc,i'll look for one with a ferrite core.

downloaderfan

downloaderfan

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Ahhh yes that is a very cheap VGA lead you definatly dont want to be using a cable like that for any run over 2 mtrs.

 

Marc

Projector Engineer

 

im getting a little bit of ghosting with that even at 1.2m,i guess i'll buy a thicker one...

Marc-Engineer

Marc-Engineer

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Posted

You could first try a couple of the clip on Ferrite chokes one on each end the ghosting can be from mains cable as well if you move the cable about does it vary? Thats what the screening protects you against its magnetic reflections causing your problems the screening (and chokes) stop it getting in to the wires carrying the signal, it can be from many things even a faulty VGA cable have you tried another?

 

Marc

Projector Engineer

downloaderfan

downloaderfan

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Posted
You could first try a couple of the clip on Ferrite chokes one on each end the ghosting can be from mains cable as well if you move the cable about does it vary? Thats what the screening protects you against its magnetic reflections causing your problems the screening (and chokes) stop it getting in to the wires carrying the signal, it can be from many things even a faulty VGA cable have you tried another?

 

Marc

Projector Engineer

 

well as u can see from the image,my vga cable already has one ferrite choke on each end,r u suggesting to put more on them?and yeah when i move the end of the cable connected to the tv,the image does vary,i have to adjust it to minimum ghosting always.

 

Nope,not tried another one yet...

Marc-Engineer

Marc-Engineer

Posted
Posted

So if moving it varies it then either the wires are lose in the cable or maybe your near something radiating RF or magnetic.

 

Sounds like a duff (faulty) lead.

 

Marc

Projector Engineer

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chazzy2501

chazzy2501

Posted
Posted (edited)

I agree that you have a bad sheild or cruddy VGA cable. Why do you want to hook your laptop up to the tv? if it's only movies and surfin the web (not video games) then you could purchase a usb video card that would have a digital output and a usb extension lead.

 

No ghosting :)

 

about £30 for a usb video card.

 

EDIT: ohh and never use a VGA splitter powered or otherwise they ruin the picture quality. Also the VGA signal is effected by resolution and refresh rate, so lower them to see if it helps.

Edited by chazzy2501
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downloaderfan

downloaderfan

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So if moving it varies it then either the wires are lose in the cable or maybe your near something radiating RF or magnetic.

 

Sounds like a duff (faulty) lead.

 

Marc

Projector Engineer

 

well sure did manage to keep my dongle away while using the vga cable...sure seems like a faulty lead....

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