Posted on 09/22/2016 7:18:08 PM PDT by TNoldman
I am building a Video Wall with 4 55 inch TV's to replace a Screen and Projector in a Bar/Resturant. The 4 TV's will arranged in a 2x2 matrix - 2 up and 2 below with TV edges just touching. The reason to invert the upper TV's is to minimize the horizontal bezels line. Most TV's have much wider lower bezel.
The TV's sometimes will display 4 different channels. On some occasions a single channel will be displayed but spread over 4 TV's via a Video Wall Controller designed for that purpose. 1/4 of the total on each TV.
Thus the desire to rotate the images on the upper two TV's. I want to use LG 55LH5750 TV's that are much less expensive that Video Wall Screens. I believe there is a Special Service Menu that will permit Rotation. I just want know how to perform this function. TV salespeople have not been a good source.
I have solicited LG with no answer yet.
Sorry first post on this matter was not clear.
I think the first question to ask would be: Can these screens be mounted upside down with no effects. And I’m pretty sure the answer would be: Not without modifications.
I believe you’ll have to install ventilation fans for the units to handle the unusual airflow conditions or they’ll just fail after a short period of time.
Additionally, I would not depend upon the units performing the video conversion, I’d seek an outside device to invert the screens - Anything and everything to move as much of the processing out of the screens and simply dedicate them to displaying the image.
I’d honestly try contacting LG directly through one of their OEM channels and get as many answers as you can that way. Because the moment you improperly mount those televisions, any warranty is out the window.
I just went through the LG manuals for this television and I did not see a way to invert the picture.
Now, you could feed the signal through a computer, which could easily invert the picture, but that’s an extra step and cost.
Thank you. I saw that YouTube video explai ing generic LG Picture rotation. I want verify it will work on the one I wish to purchase.
FReepers are manytime a better info base than the manufacturer’s reps.
Another possibility would be to slightly stagger the units in depth so as to hide one bezel behind the other, and keep them upright.
On some occasions a single channel will be displayed but spread over 4 TV’s via a Video Wall Controller designed for that purpose.
...
I guess they don’t make a controller that will also rotate the pictures.
The key is to access the hidden Service Tech Menu that the manufacturers don’t want to admit exists.
That my friend is worth investigating. This how problems get resolved with original thinking.
Thank you.
I know it’s not helpful, but one would think that the Video Wall Controller would have that feature?
This controller says it can do rotation of an individual output.
https://www.blackbox.com/en-us/store/Detail.aspx/VideoPlex4-4K-Video-Wall-Controller/VSC-VPLEX4
You face a couple of issues. Kingu is correct, the thermals of mounting a consumer TV upside down can vary widely. That is one of the important reasons that commercial displays exist - to ensure that they can handle adverse conditions. And the warranty will be certainly voided if used in commercial applications.
The issue of bezel size and placement is common in digital signage. There is a reason that ultra-narrow bezels cost more - it is very hard to get the electronics from the video processor to the LCD mylar with a “zero bezel” design, while respecting the afore-mentioned thermal issues. And consumer TVs need to have somewhere to put speakers, which your video wall will not need.
You will also find that consumer TVs will often have slight delays even between identical units. One picture will be out of sync, like old Italian movies (is that profiling?)
Your best bet is to look at a digital signage box that will manage the high bandwidth video content (Thanks kingu!). You don't need to look at RGB Spectrum boxes but I would skip the new cheap Android media players. Look at an i5 or i7 media player with a powerful graphics engine.
Take a look at Rise Vision software - its free! And it may solve part of your issues that you will discover. Many other good software packages out there too.
Taking a 1K or a 4K image, splitting it into 1/4s, inverting half of the images and then displaying them in sync 60 times a second (59.94 to be more accurate) requires some fast processing. There is a reason that video scalars are expensive.
I think that you might pull it off, but the cost of your labor may exceed the cost of the hardware savings by going cheap on the TVs.
There is one problem, however. While it allows incredible flexibility of applications it is command line based and you will need to somebody skilled in programming to get it to do most of it's magic. I also believe that there are a number of function libraries available for it and I wouldn't be at all surprised if the video wall software has already been written and made available on Sourceforge.
You will also need hardware to run it on. I seem to recall that people are running it on $50 Raspberry Pi machines and I believe that people have built HD video walls using small clusters of Raspberries, one per screen and one as a controller.
You can find a number of other possible solutions by searching on “avisynth + videowall”
Good luck and please drop me a private message sometime in the future if you go this route and get it working as I'd like to know how you did it.
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