0

When I was using adapter combo from HDMI to DVI then to VGA then to monitor and it didn't work, so I just go to but without DVI to VGA adapter it works. Actually I still have no idea why I can't just cast it twice.

Currently I face to a new problem, my monitor only allows DVI or VGA input, if I use micro HDMI to HDMI and then use HDMI to DVI to monitor would it work?

1 Answer 1

1

This is not a poblem of an adapter, but of the rather byzantine design of the DVI interface: DVI is one of the very few cables, that are able to carry an analog signal and a digital signal on the same plug.

It is perfectly legitimate for a DVI device, cable or adapter to support only the former or only the latter.

With your first example, you started with HDMI - a pure digital signal. The adapter converted it to a DVI plug just fine, but of course it only used the pins for the digital signal, leaving the analog ones unused. The next adapter was intended to convert it to VGA, which is a purely analog signal. The adapter would use only the analaog pins of DVI (where there is no signal) and ignore the digital ones (where there would be one available) - this ofcourse didn't work

In your second example, you start with micro-HDMI (digital), convert to HDMI (digital again) and finally to DVI - this will work, if the Monitor uses the digital pins of the DVI plug, not only the analog ones.

All monitors I ever saw, that had a DVI plug used these digital pins, so expect it to work fine.

1
  • So the keypoint is DVI interface support both signals. But I still confused with the signal type casting. Because If I directly use HDMI to VGA adapter and then use VGA to VGA cable it works. Finally I want to ask is there any rules that can check it before buy the adapter.
    – SheiUn
    Sep 21, 2020 at 7:59

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .