Post by Philip Ayres on Oct 22, 2018 7:08:06 GMT
I'm seeing an interesting issue on one of the sites our church uses. I think I can explain the problem but would like some input into if what I think is happening is possible.
Here's the setup we have:
* Relatively new laptop, 2 years old, HDMI socket on the side, no VGA out, Win10.
* School projector, outputs in widescreen, but with a VGA lead attached.
Put an HDMI/VGA convertor between the two and everything has been fine for nearly two years. Lovely 16:9 output appears on the screen in 1920 x 1080.
The last 3-4 weeks we've been having all sorts of issues which has been laid at the door of the software we used. But on my last two visits I noticed the output from the Laptop wasn't looking right on the screen and a peak in the display setting indicated the computer was outputting to screen 2, the projector, at 4:3 and at a much lower resolution (I forgot to take a note of what resolution) than I expected. Whatever it was the laptop was marking it as the recommended resolution in the display settings but did allow higher resolution that let me fix the problem.
Around the time the problems arose we had to change the HDMI/VGA adaptor - someone split the case on the HDMI connector and the wire inside was slowly getting looser causing a bad connection and affecting the picture. At the same time our hosts changed the VGA cable.
Question 1) Is it possible that either this new adaptor or the VGA cable is somehow preventing the PC from automatically detecting how big the projection output is, causing the PC to select some sort of default lower resolution?
The team on site hadn't caught that the text looking different was a symptom something was wrong, they know now and have been taught how to check the display settings before anything happens, so even if the answer to 1 above indicates we've bought a dodgy adaptor, we can get round the problem.
The problems we're seeing on the screen mainly involved a scrolling banner we have on the second screen disappearing. As I said above PC was outputting 4:3, projector was showing 16:9.
My expectation is that a 4:3 input would appear pillarboxed on a 16:9 screen, or stretched into the 4:3 format. Neither appeared to be the case, if anything what we were seeing was the top and bottom of the picture being lost. I forgot to check what I was actually seeing when I was there today, instead concentrating on fixing the fault.
Question 2) Is it possible that the projector was choosing to display it's 4:3 input by loosing the top and bottom of it and just displaying the 16:9 strip in the middle of the picture?
Here's the setup we have:
* Relatively new laptop, 2 years old, HDMI socket on the side, no VGA out, Win10.
* School projector, outputs in widescreen, but with a VGA lead attached.
Put an HDMI/VGA convertor between the two and everything has been fine for nearly two years. Lovely 16:9 output appears on the screen in 1920 x 1080.
The last 3-4 weeks we've been having all sorts of issues which has been laid at the door of the software we used. But on my last two visits I noticed the output from the Laptop wasn't looking right on the screen and a peak in the display setting indicated the computer was outputting to screen 2, the projector, at 4:3 and at a much lower resolution (I forgot to take a note of what resolution) than I expected. Whatever it was the laptop was marking it as the recommended resolution in the display settings but did allow higher resolution that let me fix the problem.
Around the time the problems arose we had to change the HDMI/VGA adaptor - someone split the case on the HDMI connector and the wire inside was slowly getting looser causing a bad connection and affecting the picture. At the same time our hosts changed the VGA cable.
Question 1) Is it possible that either this new adaptor or the VGA cable is somehow preventing the PC from automatically detecting how big the projection output is, causing the PC to select some sort of default lower resolution?
The team on site hadn't caught that the text looking different was a symptom something was wrong, they know now and have been taught how to check the display settings before anything happens, so even if the answer to 1 above indicates we've bought a dodgy adaptor, we can get round the problem.
The problems we're seeing on the screen mainly involved a scrolling banner we have on the second screen disappearing. As I said above PC was outputting 4:3, projector was showing 16:9.
My expectation is that a 4:3 input would appear pillarboxed on a 16:9 screen, or stretched into the 4:3 format. Neither appeared to be the case, if anything what we were seeing was the top and bottom of the picture being lost. I forgot to check what I was actually seeing when I was there today, instead concentrating on fixing the fault.
Question 2) Is it possible that the projector was choosing to display it's 4:3 input by loosing the top and bottom of it and just displaying the 16:9 strip in the middle of the picture?
