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I'm running a computerized system and for some reason, whenever I plug the video signal into the bar's big screen TV, I get a hum in the audio.  I've had this happen on two different computers, and with the TVs from two different bars.  My video signal is split between a small TV for the singers, and the bar's big screen.

Anyone know an easy fix for this?

Thanks in advance.

More than likely there is a cable TV line going to the TV.  Disconnect this and the hum should stop.  I have the same situation.  Behind me up high is a house TV 32"  It is for the crowd to see the lyrics while my LCD monitor is for the singers.  If I don't disconnect the cable line form the big TV, there is a hum in the system.

Kelly

it could be a ground problem, i'm not guru but it could be there's too much current around your sytem and it's getting into your audio cable... you can try better insulated wires or get a ground isolator... i was hooking up my laptop to my home theatre without the ground isolator at first and when i plug in the power of my laptop it'd cause the speakers to go crazy, but with it (got one from radio shack for 17 bucks) my speakers are coming out pretty clear.  

Hope it helps.

could be ground loop prob..........use an adapter(about 50 cents) that takes your computer plug from 3 to two(omitting ground)......some people think this is an unsafe practice........never had a problem in several years........good luck

True.  Laptop IS usually a ground loop problem however I have found TV hum usually turns out to be a cable or satellite connection.

Kelly

Just FYI...  Of the two computers I mentioned above, one was a laptop that I tried both with and without the power supply plugged in, and the other is a tower.  All scenarios still generated the hum.

Both TVs have cable connected, so I'm going to try unplugging the cable at my next show (on Fri) and see how that goes.  If that does not work, and I don't get any better suggestions, I might try lifting the the ground on the PC.

its probably a grounding issue with the TV or cable/sattelite system, or it could be that the cables/splitters/ends that you are using are of low quality and are allowing noise to ingress into the cable line.

Find yourself a good peice of cable (RG6 coaxial with snap and seal ends on them)....tip the cable guy to make you one long enough.... Run it across the floor from your system, to the TV, and see if that eliminates th hum.   If that fixes the problem, then your cable or splitter is bad.  Get new ones, and agin tip the cable guy.

If you still have the problem testing with a good cable, then it is a grounding issue.  Check the TV to see if it is properly pluged in....ther is a big and smal spade on the plug, and they could be plugged into the wall improperly.

I read your question again, and I mean no offense, but is the volume muted, or at least turned completely down to 0 on both tvs? Have you tried a different video input, or another channel?.....I know you don't have time, but it's gonna be a process of eliminating things......wish I could be more help......good luck...

I had a ground looping problem like that...
I found from my system via video to video there was a loud humming through "My" system. I pulled grounds, changed wires blah blah blah. Baffled to no end, I sent the signal to the TV through a RF modulator (channel 3) and the humming went away...

I could only guess the loop was somehow coming back into my system via the video wire

On another system I worked on... they had the same problem- so with my plethora of new knowledge I applied it and it didn't work. They had an inexpensive RF modulator that was powered via AC to DC converter. Myself being the karaoke boy scout, always prepared, having another RF modulator in my pocket (I'm such a dork) put on and it fixed the problem.

Have fun

Hi Peter


Sammy

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Go to this site:
http://www.smr-home-theatre.org/Ground-Loops/

I had a similar problem several years ago, and made up an adapter for my coax, which eliminated the problem. Certainly far safer (and more legal), than cutting off a ground pin on a power cord.....

First off...  let me say thank you to all who responded to this post.  

I unplugged the coax running from the TV to the cable box, and the problem went away.  I would have never though of this.

Thanks again guys, you all rock.

Obviously make sure NOT to have the CATV hooked up whilst running your show.
And have the bar owner call the cable company and complain.  There obviously is some sort of issue with the cable lines, they are probably not grounded.

Please explain the video split. Normally video is distributed via a video distribution amp.. If you are y-ing the video then feedback will occur. Need some more info to address this problem.. Tell me how you are actually hooking  up   your  system..

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I've had this as well when hooking into a newer tv with multiple inputs, sometimes leaving the cable hooked up while hooking into the alternate inputs (ie second cable line/RCA) it will leave a very noticeable hum in the system basically meaning the original cable line is not grounded properly, unhook it & everything is fine.

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