Windows 7 - DVI to VGA adapter - useless? - wrong pins?

This does not work. The pins round the long pin on the DVI side are missing, so how can an analog signal possibly get to the VGA side? The vendor sent me another set with the extra 4 pins and they work fine, but I'm interested to know why these ones were ever made like this!

Wikipedia article - see pins C1 to C4

Hello!

As a starting point, so we are on the same playing field, do you understand the difference between DVI-A, DVI-D, and DVI-I, all the difference between single link and duel link? You can read about them here: All About DVI

What you are showing in your picture is a DVI-D Dual Link to VGA adapter. This adapter will take in a digital DVI input, convert, and output it to VGA, and so will be only that way around.

What exactly were you trying to do? With a few conversion cables, and with some difficulty, it is possible to connect a VGA graphics card to a DVI monitor, although my understanding of this is that it cannot work.

Richard

I am plugging an analog monitor into a digital graphics card, not the other way round.

I understand all the various digital and analog connections on the socket. But I don't believe there is a DAC chip in this - it was under a quid. And it doesn't do the conversion as there is no analog signal produced!

Normally I get something that looks precisely like the picture, except it has 4 pins around the large one - the analog pins. I've never come across a graphics card without analog on the DVI socket (except one which had it on only one of the two DVI sockets).