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Hdmi to VGA?

Posted: Sat Feb 01, 2014 6:27 pm
by StrawberryDorbs
Does a standard HDMI to VGA cable not work when connecting the pi to a monitor?

I purchased an lcd screen from ebay and got the appropriate kit. I've tested it and it connects fine and displays my mac mini, so the next step was to buy a cheap and easy hdmi to vga cable from ebay -

http://www.ebay.co.uk/itm/1-8M-HDMI-to- ... 25796bb768

I've checked out a couple videos and tried the editing to the config file but still not getting any response from the screen.

Am i better off using one of these adapters -

http://www.amazon.co.uk/gp/product/B007 ... d_i=468294

The reviews all say this works ok?

Is there no way of getting the straight vga to hdmi cable to work?

Re: Hdmi to VGA?

Posted: Sat Feb 01, 2014 6:48 pm
by DangerousDave
Hi,

From my experience, a straight through cable doesn't work. It's a while since I looked into it, but I believe there needs to be some conversion as HDMI is a digital signal and VGA is an analogue signal and they are therefore not directly compatible. I purchased a HDMI to VGA converter from RS and it works a treat: http://uk.rs-online.com/web/p/digital-v ... s/7781882/

It does beg the question why they have an adapter lead between the two!

Re: Hdmi to VGA?

Posted: Sat Feb 01, 2014 6:49 pm
by Burngate
The first item you pointed to is a plain cable, and won't work - the Pi gives out HDMI digital signals, which a S-VGA analogue monitor won't understand.

The second item will probably work, because it converts digits to analogue.
There may, however, be an issue in that it may take more current than the Pi can supply, and burn out a diode on the Pi
Or you may be lucky.

There are other converters that can be powered separately, so go for one of those if you can
The RS one pointed to above seems to be sold as compatable, so maybe it doesn't take too much current.

Re: Hdmi to VGA?

Posted: Sat Feb 01, 2014 6:54 pm
by klricks
The straight cable will never work. You need a HDMI to VGA converter box like in your 2nd link.
A better option would be to get a converter that has its own power supply.
Be sure to get a HDMI IN to VGA OUT converter and not the other way around.

I use one like this:
http://www.amazon.com/SANOXY%C2%AE-Gene ... ga+adapter

Re: Hdmi to VGA?

Posted: Sat Feb 01, 2014 8:24 pm
by StrawberryDorbs
Thanks for the replies.

This looks ok -

http://www.amazon.co.uk/Adapter-Power-F ... in+vga+out

has an HDMI in, VGA out. A couple of the reviews mention that it seems to be a plug and play fix for RPi hdmi to vga.

Re: Hdmi to VGA?

Posted: Sat Feb 01, 2014 10:15 pm
by FTrevorGowen
StrawberryDorbs wrote:Thanks for the replies.
This looks ok -
http://www.amazon.co.uk/Adapter-Power-F ... in+vga+out
has an HDMI in, VGA out. A couple of the reviews mention that it seems to be a plug and play fix for RPi hdmi to vga.
That appears to be the type I (and other forum members) have used with some success.
FWIW, more info on my experiences can be found here:
http://www.cpmspectrepi.webspace.virgin ... erter.html
and some examples of optimised settings here:
http://www.cpmspectrepi.webspace.virgin ... GA_Monitor
Trev.