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Topic:
How to fix HDbaseT link with stuttering audio .. due to 'dirty power'
This thread has 7 replies. Displaying all posts.
Post 1 made on Monday April 16, 2018 at 12:42
james_aa
Junior Member
Joined:
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January 2018
39
Ive got an issue on a site where the electrical supply for the AV equipment isn't on a separate ring main from the rest of the appliances (eg. fridge, freezer, washer / dryer etc..)

The majority of the equipment is connected to the power via a surge protected PDU. The existing electrical supply was there when we started the project so didnt have a chance to spec it.

The problems are as follows :

We have a HDbaseT matrix in the rack connected to a surge protected supply. The RX balun is connected to the matrix over UTP cat6. The RX balun is powered locally as is the TV by a surge protected extension lead. The picture works fine on this TV, but about 15 mins or so the audio cuts out for about 1-2 seconds. I dont think the interval is regular. The TV is using the TVs in build speakers.

Any idea what could be done to rectify this other than putting the AV mains on a serpeate ring main ?
Post 2 made on Monday April 16, 2018 at 13:47
Brentm
Ethereal Home Theater
Joined:
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July 2003
2,351
This sounds more like an EDID failure that a power issue.
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Brent McCall
Paid Endorser for
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Post 3 made on Monday April 16, 2018 at 13:49
Lowhz
Senior Member
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April 2012
1,136
Is it on all sources or just the cable box? Is it just a couple channels on the cable?
Post 4 made on Monday April 16, 2018 at 19:10
JT Babin
Junior Member
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June 2016
37
Doesn't sound like it would be easily to duplicate with any confidence, but if it was I'd say move the cable box in question near the display and running it for a hour. If it's multiple sources I'd feel pretty confident just using an Apple TV on wifi or something, but would definitly use copyright content. A single drop out means it has nothing to do with your HDBT, Power, Etc.

I had a similar problem with a powered in-wall soundbar. It got worse over time, finally bad enough to duplicate and it turned out to be the internal amp. Replaced, done, no call back.
James Babin - System Designer (https://myeasytek.com)
Post 5 made on Monday April 16, 2018 at 20:58
sydinstaller
Active Member
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February 2004
740
There are a few things we need to know.
  • How long is the cable run (CAT cable)?
  • How long are the HDMI leads?
  • Is it wired as 568B or 568A?
  • Are there any joins in the CAT cable? I.E. does it go through any patches points or wall plates.
  • Are there any sharp bends in the CAT cable?
  • Does the CAT cable run near any power cable?
  • Does the issue happen if you connect the source directly to the TV?
  • Have you tried a different HDMI port on the TV
  • have you tried a different HDMI lead (you will be surprised how often this is the cause)
  • Are the cable terminations actually done correctly, and are confirmed ok with a cable tester?

Dan.
Post 6 made on Monday April 16, 2018 at 22:17
Ernie Gilman
Yes, That Ernie!
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December 2001
27,700
On April 16, 2018 at 20:58, sydinstaller said...
There are a few things we need to know.
  • How long is the cable run (CAT cable)?
  • How long are the HDMI leads?
  • Is it wired as 568B or 568A?
  • Are there any joins in the CAT cable? I.E. does it go through any patches points or wall plates.
  • Are there any sharp bends in the CAT cable?
  • Does the CAT cable run near any power cable?
  • Does the issue happen if you connect the source directly to the TV?
  • Have you tried a different HDMI port on the TV
  • have you tried a different HDMI lead (you will be surprised how often this is the cause)
  • Are the cable terminations actually done correctly, and are confirmed ok with a cable tester?

Dan.

Brent probably has hit the correct answer. But the other questions might shed some light, too.

Have you checked the integrity of the grounds?

Then, ? ? re A and B: I'm wondering why A or B might be an issue.

The difference between 568A and 568B is the physical position of the green and the orange wire pairs, and there's nothing in either spec that calls for any particular physical difference between pairs of different colors. Yes, pairs are supposed to be twisted at different rates to minimize crosstalk, but the spec doesn't say which colors get more twists, or how many, than the others, just taht different twist rates must reduce crosstalk to a spec minimum.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 7 made on Tuesday April 17, 2018 at 00:34
Jeff at Zektor
Active Member
Joined:
Posts:
August 2009
527
If I read this correctly, the receiver is powered locally. Most HDBT matrices are POH for a number of reasons. Besides convenience, most of the time the receiver and TV would be on an outlet on a different phase than the rack. If there is something noisy or taking a big power draw that might be using much of the available amps creating a surge or brown out. I'm not a sparky but we have pretty much seen it all when it comes to tech support.

Sydinstaller also brings up another enemy of HDBT; the keystone or patch panel. How close is the CAT cable routed to a jbox or flourescent lighting? EMI/RFI can also cause intermittent issues like this. Hopefully someone didn't nick the cable jacket somewhere along the line.

One thing to try would be to run a new CAT cable externally from the rack to the TV with an HDBT kit that is POE. It might help narrow down if you truly have a cable issue.

Good luck
Jeff Haynes
The Big Kahuna
Zektor Inc.
Post 8 made on Tuesday April 17, 2018 at 20:18
Ernie Gilman
Yes, That Ernie!
Joined:
Posts:
December 2001
27,700
On April 16, 2018 at 13:47, Brentm said...
This sounds more like an EDID failure that a power issue.

You started this thread after assuming that it was a power issue. Back up a step and look for other root causes before going nuts on the power connections!
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw


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