HDMI Signal interference

[ScoutMaster]

I am running HDMI over cat 5 to a panasonic 103" plasma. Distance is not that far (about 15m) and signal has been fine for months.
Just recently, there is an intermittant,broken up, horizontal line rolling very fast up the screen that looks like analogue interference. It also runs through a HDMI switch but doen't appear on the secondary source. Any ideas?

[shovenose]

Re: HDMI Signal interference

Do you walk often over the cable, is it heavily creased somewhere, or have you dragged something heavy across the cable lately?

[ScoutMaster]

Re: HDMI Signal interference

The cable is installed through a riser and from a rack. No chance of crush/creasing.

[tedjar]

Re: HDMI Signal interference

This is a situation that needs a "divide and conquer" troubleshooting technique...

Lets consider the potential problems:

1. The Source - Probably not since the 2nd display is OK
2. The Switch - Could only one side be bad?
3. The HDMI via Cat5 setup
4. The Monitor

Unless the monitor is mounted up somewhere inaccessible, I'd try to plug a DVD player or other HDMI source in direct via the same input in question. See where that goes, then you know you are chasing a monitor problem or a signal transmission one.

I want to say ground loop, but not sure if that has any relevance since HDMI is digital. I do have fond memories of chasing hum bars running composite video to projectors over 150ft+ of RG6 though.

[tom66]

Re: HDMI Signal interference

to a panasonic 103" plasma

Dear Santa.......

On a more serious note, it sounds more like a problem with the TV than the signal - have you tried connecting something near to the TV?