Originally Posted by Polish Hammer
OK, latest results of my amateur testing would lead me to believe it is the switch that is the problem, and not the cable. Also, the cable length (I would think) would not be the problem as there was no issues at all with the lower resolutions, just the higher ones. I'm sure I'm wrong with this assumption, but I would think that if the problem was the cables, I would still experience some sort of issue at 480p, and something progressively worse as I tried to do 720 and 1080.
This was not the case though, as 480 was clear and 720 and 1080 were equally bad. No sweat though, as long as Monoprice switches out the units for me easily I have no qualms.
Could you detail what you tested and in what order?
Your assumption that if it is the cable, then you would definitely see problems at 480p is not correct. With 720p/1080i and most of all with 1080p, there are less tolerance for problems with the eye diagram, so it is quite possible for a cable to test fine at 480p, but not at 720p/1080i.
The higher the bandwidth, the more problems can be exposed all over the TMDS chain.
Those problems can be in the TMDS transmitters, the cable, the switch, or the receiver.
nVidia had a problem with their graphics card where the TMDS transmitters weren't up to par and they weren't reliable above 135MHz which means they couldn't do 1600x1200 and 1920x1080 reliably.http://www.extremetech.com/article2/...1367926,00.asp
Here is an example of poor TMDS transmitter coupled with longer cable causing issues.http://www.extremetech.com/article2/...1367919,00.asp
Cable length can be an issue. We've seen 135MHz DVI signals drive a compliant 1600x1200 display - until you attach a ten-foot (three-meter) cable. Then the image quality takes a nosedive.
IMO it makes sense to do specific tests to isolate the problem and I can't tell from what you've written so far what has been tested. Of course if the switch is defective you should have it replaced. I'm just trying to save you some back and forth with returning the unit, until you've really determined where the problem is. Maybe you have already, but just haven't described what you tested in enough detail. I was a little concerned because some of the assumptions you are making are not accurate and that may lead to incorrect conclusions.