HDMI to VGA converter, no video


38 posts   Page 1 of 2   1, 2
by DougM » Mon Dec 03, 2012 2:49 am
can anyone tell me if this adapter:

http://www.amazon.com/gp/product/B007KF ... 00_s00_i01

will work to convert the RasPi HDMI video to VGA?

I've loaded 2012-10-28-wheezy-raspbian.img to a 32GB SD card and when I apply power (should be plenty of power, coming straight from a standalone PC power supply) the activity light blinks for a while and the monitor comes out of sleep but no video is displayed. I tried on two separate monitors, an old NEC and a newer Dell.

Are there any troubleshooting tips I can follow? Failing that is there a known good HDMI-->VGA adapter I can get?

Unfortunately I don't have anything in the house that will take composite video as an input.

Thank you,

DougM
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by mike3 » Mon Dec 03, 2012 10:08 am
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by Mobius » Mon Dec 03, 2012 11:06 pm
I had a similar issue in that I would not get video displayed on my TV unless it was already in HDMI mode when I powered up the Pi. If I then switched the cable over to the monitor it displayed but would not display at all on the monitor if I started with the Pi hooked to it. Solved the problem when I found out about config.txt. You can modify that to force the Pi to output HDMI. The problem apperas to be that going through an HDMI to VGA adapter keeps the Pi from automatically detecting the monitor so it defaults to composite output. My understanding is that only one of the two outputs can work at a time. Anyway, check this wiki: http://elinux.org/RPiconfig

I'd start with just uncommenting "hdmi_safe=1". That will force the HDMI on and put it in a low resolution mode that any monitor can handle. You can comment it back out later and set your desired resolution. You may have to uncomment "hdmi_force_hotplug=1" to ensure that the HDMI always gets activated.
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by ahstwin » Mon Dec 03, 2012 11:54 pm
Converting from a HDMI to VGA signal is not advised as the converters can be hard to find (Both expensive and difficult to obtain). You'll see heaps of different ones on the market but they probably won't work. As stated on the forums in numerous places, you'd need a special converter box to convert the digital HDMI signal to VGA. Some cheap ebay or amazon product going for $10 ain't gonna do the job for you.

To save yourself from heartbreak and a hole in your wallet, you should just look for a method to convert the analog video signal to a vga plug into a monitor instead of trying to harness the HDMI signal.
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by toxibunny » Tue Dec 04, 2012 12:01 am
ahstwin wrote:Converting from a HDMI to VGA signal is not advised as the converters can be hard to find (Both expensive and difficult to obtain). You'll see heaps of different ones on the market but they probably won't work. As stated on the forums in numerous places, you'd need a special converter box to convert the digital HDMI signal to VGA. Some cheap ebay or amazon product going for $10 ain't gonna do the job for you.

To save yourself from heartbreak and a hole in your wallet, you should just look for a method to convert the analog video signal to a vga plug into a monitor instead of trying to harness the HDMI signal.


Actually, the neewer converter is one of the ones in the wiki listed as working. Prices for converters are also getting lower all the time.

That said though, unpowered converters are still a risky gray area, because the pi has a diode in place that can easily burn out if too much power is being pulled through the HDMI port - you would be well advised to get a HDMI>VGA converter with it's own power supply, or if you're okay with a soldering iron, you can open up that unpowered converter and inject a few volts of your own...

read this: viewtopic.php?f=28&t=9819&hilit=burning
note: I may or may not know what I'm talking about...
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by Mobius » Tue Dec 04, 2012 12:49 am
ahstwin wrote:Converting from a HDMI to VGA signal is not advised as the converters can be hard to find (Both expensive and difficult to obtain). You'll see heaps of different ones on the market but they probably won't work. As stated on the forums in numerous places, you'd need a special converter box to convert the digital HDMI signal to VGA. Some cheap ebay or amazon product going for $10 ain't gonna do the job for you.

To save yourself from heartbreak and a hole in your wallet, you should just look for a method to convert the analog video signal to a vga plug into a monitor instead of trying to harness the HDMI signal.


Actually, I got a cheap one from eBay ($10.16 with free shipping) and it worked fine after I figured out the issue with the monitor not being detected automatically by the Pi. Not sure if they ship outside of the states but the sellers are: emilyandlily
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by DougM » Tue Dec 04, 2012 3:04 am
It came right up as soon as I edited the config.txt and uncommented the following line:

# uncomment if you get no picture on HDMI for a default "safe" mode
hdmi_safe=1

I realize that it's dangerous, but I performed a detailed point heat analysis (put my thumb on the board) and no heat was detected, but I'll keep an eye on it.

Thank you for all your help!

DougM
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by ahstwin » Tue Dec 04, 2012 3:35 am
Wow really? Maybe I should look into getting one for use on some of my old analogue tech.
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by mike3 » Tue Dec 04, 2012 5:34 am
Yeah i really thought something like the raspberry pi would have an easier time making old vga but looks likes new SOCs deprecated anything analog.
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by Mobius » Wed Dec 05, 2012 3:10 pm
DougM wrote:It came right up as soon as I edited the config.txt and uncommented the following line:

# uncomment if you get no picture on HDMI for a default "safe" mode
hdmi_safe=1

I realize that it's dangerous, but I performed a detailed point heat analysis (put my thumb on the board) and no heat was detected, but I'll keep an eye on it.

Thank you for all your help!

DougM


I'm currently running my monitor in it's desired mode of 1366 by 768. I had to get there by uncommenting the "hdmi_force_hotplug" line and setting the resolution using "framebuffer_width" and "framebuffer_height". For some reason, using the "hdmi_group" and "hdmi_mode" commands did not give me the desired resolution. You will need to comment out the"hdmi_safe" line to get the other settings to take effect because the safe mode forces both a hot plug and a low resolution.
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by kaspencer » Wed Dec 05, 2012 5:50 pm
OK,

The Pro Signal PSG90732 HDMI-SVGA converter definitely works with the RPi, and doesn't even cost a big toe, let alone an ARM and a leg. (Less than the $10 stated by Mr Mobius but in our lovely English pounds. A fiver'll get you one.) Don't expect any sound when using an HDMI adapter, though. You'll need stereo cable for that.

Kenneth Spencer.
2x256Mb + 2x512Mb RPi, Eth'netLAN+Win2k3R2 svr, 40MbpsFTTC.
RaspBMC: 128G SD, K400 wl Kb+TPd, HD32tv&Rem.
RW'y webserver: 64G SD, Y-RK49 wl Kb+M, HannsG W24" screen
RW'y PDC & fileserver: as above + 2TB disc.
+RiscOSPi on 32G uSD.
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by nerdynernerd » Thu Jan 24, 2013 10:43 pm
After fighting with getting my cheapo VGA converter to work on the RPi for a while I thought I'd share my results here. There are several potential problems:

* HDMI is not properly detected so that hdmi_safe=1 has to be used in config.txt, as mentioned above
* The supported monitor mode(s) are not reported back to the HDMI, so hdmi_mode has to be set to the needed resolution and refresh rate directly
* The voltage supplied to HDMI pin 18 via D1 is not sufficient so D1 has to be bridged

To the last point: D1 takes about .2V off the 5V rail so we end up with 4.8V which for my adapter wasn't enough. After bridging D1 and the config.txt settings everything started working beautifully.

BTW one can easily measure the current needed for the adapter without removing D1 by putting an ampere-meter between TP1 (5V) and the diode's cathode, next to "D1" on the PCB. In this setup, the diode is bridged immediately and no current will flow through it. In my case it was 148mA which proved that it wasn't the current that was the problem - the BAT54 can handle 200mA - but the voltage.

Word of caution: Make sure your power supply can handle the extra current AND you are sure that you won't forget to remove the bridge before hooking up the RPi to a regular HDMI display! As mentioned previously, D1 is there for a reason which is to protect your hardware if an HDMI-connected device also supplies 5V to pin 18.
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by addjango » Thu Jan 31, 2013 1:53 pm
Hdmi safe will work in most cases, The PI is then forced to boot in a predefined safe mode resolution,

Keep hdmi safe disabled,

and then set hdmi_group and hdmi_mode to match up to your displays resolution:

You can find the settings here:

http://elinux.org/RPiconfig
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by publicmontford1 » Wed Feb 20, 2013 1:56 pm
Hi! This is my first post on this forum so I hope this helps everyone.

To convert your raspberry Pi or any device from HDMI to VGA ( or from VGA to HDMI )then you will need a converter, the reason why a cable doesn't work is because HDMI is digital and VGA is analogue, so power is needed to convert the digital signal into analogue.

What I have realized is that people on the internet have been falsely selling HDMI to VGA cable converters when they know they don't work, but only sell them to make a profit for them selves. Often you see customers asking for a refund after realizing that what they just bought is nothing more than worthless plastic.

Getting to my main point, If you want to convert a Raspberry Pi device into VGA successfully you will require the following things:

1) A cheap and simple HDMI cable to connect your Raspberry Pi into a vga to hdmi converter .

2) A good quality VGA to HDMI converter, many well known websites sell these such as Amazon, i got mine from this websitehttp://scarttohdmi.co.uk/vga-to-hdmi/ , they have a good customer service and a good return policy if your converter is faulty.

3) And finally you need a cheap VGA cable which can be found in Poundland or a cheap shop in your area, this is to connect the converter into your Raspberry PI.

Once you set it up it should look something like this:

Image

I forgot to add to the diagram that a power supply cable is connected to the vga to hdmi converter since that is vital.

Ok that's me done, hopefully this post helps the community since its my first post on this forum.

See you :)
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by rurwin » Wed Feb 20, 2013 2:21 pm
publicmontford1 wrote:2) A good quality VGA to HDMI converter, many well known websites sell these such as Amazon, i got mine from this website... , they have a good customer service and a good return policy if your converter is faulty.


I hope they have a good return policy, since you will be sending yours back.

You want a HDMI to VGA convertor, and that site does not sell them. It sells VGA to HDMI convertors, but that is useless for the Raspberry Pi.
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by publicmontford1 » Wed Feb 20, 2013 5:23 pm
rurwin wrote:
publicmontford1 wrote:2) A good quality VGA to HDMI converter, many well known websites sell these such as Amazon, i got mine from this website... , they have a good customer service and a good return policy if your converter is faulty.


I hope they have a good return policy, since you will be sending yours back.

You want a HDMI to VGA convertor, and that site does not sell them. It sells VGA to HDMI convertors, but that is useless for the Raspberry Pi.


Sorry must of put the wrong link, the correct link is: http://scarttohdmi.co.uk/vga-to-hdmi/, if you could change it to that, it would be great! But yes you are right a HDMI to VGA converter is needed.
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by rurwin » Wed Feb 20, 2013 10:39 pm
I don't know if it was a wrong link, or just that I was being a blind twit. I've reinstated the link.
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by Mobius » Thu Feb 21, 2013 12:37 am
Gee, my cheap HDMI to VGA converter came with an HDMI male plug so the only extra cable I needed was a standard VGA one. The voltage issue someone mentioned above could well be attributed to the infamous polyfuse on the input. The more current drawn through the polyfuse, the lower the voltage. I have bypassed my polyfuse with a glass fuse and have had zero issues running ethernet, wireless, mouse, keyboard, and VGA converter all at the same time. My TP1 to TP2 voltage is rock solid at over 4.9 volts.
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by mahjongg » Thu Feb 21, 2013 1:14 am
Mobius wrote:I have bypassed my polyfuse with a glass fuse

:o Thats no good!
You could just as well have used a piece of wire! :shock:

A fuse isn't an improvement over a polyfuse in this case, unless the polyfuse was completely unrecoverable blown multitudes of times. The reason is that a glass fuse would need more power to blow than a polyfuse of the same current (blow) value, (it's fuse wire must be heated to a much higher temperature than a polyfuse, so it needs much more energy) that means that if you use a fuse of the same current value as the polyfuse then it would cause a larger voltage drop, (to extract enough energy) than the original polyfuse.

A fuse with a resistance low enough to cause a similar drop as the original polyfuse would have such a high current rating that you just as well could have used a piece of wire instead of a fuse, in both cases you would effectively have used the short circuit and over-voltage protection.
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by PacificDragon64 » Thu Feb 21, 2013 4:58 am
I have also read many bad experiences with HDMI to VGA adapters, but i have also read about others who have had no problems with them. It was a risk to purchase an adapter knowing that it might not work :? , or even worse melt my Pi :x . I guess i am one of the lucky ones who has a working setup without any problems to report and no modifications to be made to the adapter or the Pi :P . To see it in action, read my previous post...

http://www.raspberrypi.org/phpBB3/viewtopic.php?f=26&t=33239

I think that the monitor is what determines weather it will work or not. It all depends on just how much current your monitor draws from the Pi.

My Monitor is a Dell (E151FPb) circa 2003. It worked as soon as i connected the Adafruit HDMI to VGA adapter.

Once my monitor was running and displaying a picture, i ran the following commands to see what video modes were supported by my monitor in order to setup CONFIG.TXT correctly:

Enter the following command to see all CEA supported modes
Code: Select all
# /opt/vc/bin/tvservice -m CEA


Enter the following command to see all DMT supported modes
Code: Select all
# /opt/vc/bin/tvservice -m DMT


I added the following to my CONFIG.TXT to best suite my monitor:
hdmi_drive=2
hdmi_group=2
hdmi_mode=16


If you can't get your monitor to display, then read the specs for your monitor to find the correct supported display modes. Set the "hdmi_mode=" and "hdmi_group=" switchs using the lowest supported resolution first. If that works, try the next higher resolution.

Here is a list of screen resolutions in CEA or DMT format that the Pi supports. Use this list to correctly set both the "hdmi_mode=" and "hdmi_group=" switchs in CONFIG.TXT

ex:
hdmi_group=1 CEA
or
hdmi_group=2 DMT
and
hdmi_mode=(value)

These values are valid if hdmi_group=1 (CEA)
hdmi_mode=1 VGA
hdmi_mode=2 480p 60Hz
hdmi_mode=3 480p 60Hz H
hdmi_mode=4 720p 60Hz
hdmi_mode=5 1080i 60Hz
hdmi_mode=6 480i 60Hz
hdmi_mode=7 480i 60Hz H
hdmi_mode=8 240p 60Hz
hdmi_mode=9 240p 60Hz H
hdmi_mode=10 480i 60Hz 4x
hdmi_mode=11 480i 60Hz 4x H
hdmi_mode=12 240p 60Hz 4x
hdmi_mode=13 240p 60Hz 4x H
hdmi_mode=14 480p 60Hz 2x
hdmi_mode=15 480p 60Hz 2x H
hdmi_mode=16 1080p 60Hz
hdmi_mode=17 576p 50Hz
hdmi_mode=18 576p 50Hz H
hdmi_mode=19 720p 50Hz
hdmi_mode=20 1080i 50Hz
hdmi_mode=21 576i 50Hz
hdmi_mode=22 576i 50Hz H
hdmi_mode=23 288p 50Hz
hdmi_mode=24 288p 50Hz H
hdmi_mode=25 576i 50Hz 4x
hdmi_mode=26 576i 50Hz 4x H
hdmi_mode=27 288p 50Hz 4x
hdmi_mode=28 288p 50Hz 4x H
hdmi_mode=29 576p 50Hz 2x
hdmi_mode=30 576p 50Hz 2x H
hdmi_mode=31 1080p 50Hz
hdmi_mode=32 1080p 24Hz
hdmi_mode=33 1080p 25Hz
hdmi_mode=34 1080p 30Hz
hdmi_mode=35 480p 60Hz 4x
hdmi_mode=36 480p 60Hz 4xH
hdmi_mode=37 576p 50Hz 4x
hdmi_mode=38 576p 50Hz 4x H
hdmi_mode=39 1080i 50Hz reduced blanking
hdmi_mode=40 1080i 100Hz
hdmi_mode=41 720p 100Hz
hdmi_mode=42 576p 100Hz
hdmi_mode=43 576p 100Hz H
hdmi_mode=44 576i 100Hz
hdmi_mode=45 576i 100Hz H
hdmi_mode=46 1080i 120Hz
hdmi_mode=47 720p 120Hz
hdmi_mode=48 480p 120Hz
hdmi_mode=49 480p 120Hz H
hdmi_mode=50 480i 120Hz
hdmi_mode=51 480i 120Hz H
hdmi_mode=52 576p 200Hz
hdmi_mode=53 576p 200Hz H
hdmi_mode=54 576i 200Hz
hdmi_mode=55 576i 200Hz H
hdmi_mode=56 480p 240Hz
hdmi_mode=57 480p 240Hz H
hdmi_mode=58 480i 240Hz
hdmi_mode=59 480i 240Hz H


These values are valid if hdmi_group=2 (DMT)
hdmi_mode=1 640x350 85Hz
hdmi_mode=2 640x400 85Hz
hdmi_mode=3 720x400 85Hz
hdmi_mode=4 640x480 60Hz
hdmi_mode=5 640x480 72Hz
hdmi_mode=6 640x480 75Hz
hdmi_mode=7 640x480 85Hz
hdmi_mode=8 800x600 56Hz
hdmi_mode=9 800x600 60Hz
hdmi_mode=10 800x600 72Hz
hdmi_mode=11 800x600 75Hz
hdmi_mode=12 800x600 85Hz
hdmi_mode=13 800x600 120Hz
hdmi_mode=14 848x480 60Hz
hdmi_mode=15 1024x768 43Hz DO NOT USE
hdmi_mode=16 1024x768 60Hz
hdmi_mode=17 1024x768 70Hz
hdmi_mode=18 1024x768 75Hz
hdmi_mode=19 1024x768 85Hz
hdmi_mode=20 1024x768 120Hz
hdmi_mode=21 1152x864 75Hz
hdmi_mode=22 1280x768 reduced blanking
hdmi_mode=23 1280x768 60Hz
hdmi_mode=24 1280x768 75Hz
hdmi_mode=25 1280x768 85Hz
hdmi_mode=26 1280x768 120Hz reduced blanking
hdmi_mode=27 1280x800 reduced blanking
hdmi_mode=28 1280x800 60Hz
hdmi_mode=29 1280x800 75Hz
hdmi_mode=30 1280x800 85Hz
hdmi_mode=31 1280x800 120Hz reduced blanking
hdmi_mode=32 1280x960 60Hz
hdmi_mode=33 1280x960 85Hz
hdmi_mode=34 1280x960 120Hz reduced blanking
hdmi_mode=35 1280x1024 60Hz
hdmi_mode=36 1280x1024 75Hz
hdmi_mode=37 1280x1024 85Hz
hdmi_mode=38 1280x1024 120Hz reduced blanking
hdmi_mode=39 1360x768 60Hz
hdmi_mode=40 1360x768 120Hz reduced blanking
hdmi_mode=41 1400x1050 reduced blanking
hdmi_mode=42 1400x1050 60Hz
hdmi_mode=43 1400x1050 75Hz
hdmi_mode=44 1400x1050 85Hz
hdmi_mode=45 1400x1050 120Hz reduced blanking
hdmi_mode=46 1440x900 reduced blanking
hdmi_mode=47 1440x900 60Hz
hdmi_mode=48 1440x900 75Hz
hdmi_mode=49 1440x900 85Hz
hdmi_mode=50 1440x900 120Hz reduced blanking
hdmi_mode=51 1600x1200 60Hz
hdmi_mode=52 1600x1200 65Hz
hdmi_mode=53 1600x1200 70Hz
hdmi_mode=54 1600x1200 75Hz
hdmi_mode=55 1600x1200 85Hz
hdmi_mode=56 1600x1200 120Hz reduced blanking
hdmi_mode=57 1680x1050 reduced blanking
hdmi_mode=58 1680x1050 60Hz
hdmi_mode=59 1680x1050 75Hz
hdmi_mode=60 1680x1050 85Hz
hdmi_mode=61 1680x1050 120Hz reduced blanking
hdmi_mode=62 1792x1344 60Hz
hdmi_mode=63 1792x1344 75Hz
hdmi_mode=64 1792x1344 120Hz reduced blanking
hdmi_mode=65 1856x1392 60Hz
hdmi_mode=66 1856x1392 75Hz
hdmi_mode=67 1856x1392 120Hz reduced blanking
hdmi_mode=68 1920x1200 reduced blanking
hdmi_mode=69 1920x1200 60Hz
hdmi_mode=70 1920x1200 75Hz
hdmi_mode=71 1920x1200 85Hz
hdmi_mode=72 1920x1200 120Hz reduced blanking
hdmi_mode=73 1920x1440 60Hz
hdmi_mode=74 1920x1440 75Hz
hdmi_mode=75 1920x1440 120Hz reduced blanking
hdmi_mode=76 2560x1600 reduced blanking
hdmi_mode=77 2560x1600 60Hz
hdmi_mode=78 2560x1600 75Hz
hdmi_mode=79 2560x1600 85Hz
hdmi_mode=80 2560x1600 120Hz reduced blanking
hdmi_mode=81 1366x768 60Hz
hdmi_mode=82 1080p 60Hz
hdmi_mode=83 1600x900 reduced blanking
hdmi_mode=84 2048x1152 reduced blanking
hdmi_mode=85 720p 60Hz
hdmi_mode=86 1366x768 reduced blanking


I am very happy with the image quality. The sound comes out of the adapter via a headphone jack which suites me fine. 8-) :D

I hope this helps!
Good luck people!
Cheers!

:-)
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by mahjongg » Fri Feb 22, 2013 12:55 am
DougM wrote:I realize that it's dangerous, but I performed a detailed point heat analysis (put my thumb on the board) and no heat was detected, but I'll keep an eye on it.

Actually the "board" won't heat up even when the diode will burn out, The diode is too small, and can't transfer its heat well to the board! If you want to check if the diode overheats put your thumb directly on the diode, (D1) directly to the left of the HDMI connector.
But be careful or you might get a diode shaped blister on your thumb!
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by AndrewJohnson » Sun Jul 28, 2013 2:10 pm
I hadn't realised the current-draw issues BUT, I got my cheap £5 adapter to work

http://www.ebay.co.uk/itm/221233594745? ... 1439.l2649

after fiddling with the settings. I don't think I'll use it for long periods, though!

The settings that worked for me were

#hdmi_safe=1 (commented out)!

hdmi_force_hotplug=1
hdmi_group=1
hdmi_mode=16 (closest to my monitor resolution)

My monitor supports 1440 x 900, though with the "mode" and "group" settings, I am not sure the framebuffer settings make any difference?

The picture wasn't great, due to the mis-matched resolution, but all I wanted it for was to check what is happening on boot!
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by masterdrain » Sun Jul 28, 2013 2:49 pm
I posted details of my converter cable and config.txt settings here:-
viewtopic.php?f=28&t=50573

Iain Johnstone
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by bavara » Sat Sep 07, 2013 1:17 pm
publicmontford1's pic was helpful in finding what to get.. But I think there's one thing to correct in his pic..


This is indeed a VGA to HDMI converter
http://i.imgur.com/qb2vx4g.png

But what we want is an HDMI to VGA converter. Neet also make one, it looks like this
Image

So, the convertor's input is HDMI and the convertor's output is VGA, so the convertor is HDMI to VGA.

And likewise/also in terms of time, data goes from the output of the HDMI of the Raspberri Pi TO the input VGA of the screen.

So, HDMI to VGA.

I haven't bought the "neet" convertor yet.

Fortunately The HDMI to VGA is cheaper.. Looking at the UK site.. £25 for the HDMI to VGA. £40 for VGA to HDMI.

Also this guy e-qstore
http://www.ebay.co.uk/sch/e-qstore/m.html
and I think njytouch
http://www.ebay.co.uk/sch/njytouch/m.html

sell adaptors to connect laptop screens to VGA.

their adaptors are compatible with many models of laptop screen, or you can get a model of laptop screen that is compatible with their adaptors. I'm going to be connecting an LCD to my Rpi. by getting one of those neet converter devices. I have already connected my laptop screens to VGA on my small computers that have VGA ports.
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by Wilson44 » Tue Dec 24, 2013 4:01 pm
Re VGA to HDMI converter.
I bought a cheap converter (not powered) connected it to R /Pi with an SD card loaded with an XBMC media program with no problems but when I changed to an SD card with the Pi OS (a version from Amazon which works with the TV) the Pi would not connect with the VGA monitor. So it looks like a software problem?
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