Interference on Plasma.

[~JC~]

I just hung the plasma on the wall, so it is time to hide the wires. Picture was perfect (for broadcast) when connected straight from the low wall cable outlet to the TV. The electrician just ran the cable up inside the wall, and out to the tv (from behind it, wire now "hidden" ) The picture quality is now poor, with horizontal light dots that travel from right to left. There are electric lines inside this wall (don't know exactly where, but since there are outlets on this wall, there must be lines. I tried a line "filter", that I can't recall the name of right now, that made it worse. Thoughts? Better coax? reroute? Thanks

 

[~JC~]

So I stumped the panel?

 

[mtrycrafts]

I just hung the plasma on the wall, so it is time to hide the wires. Picture was perfect (for broadcast) when connected straight from the low wall cable outlet to the TV. The electrician just ran the cable up inside the wall, and out to the tv (from behind it, wire now "hidden" ) The picture quality is now poor, with horizontal light dots that travel from right to left. There are electric lines inside this wall (don't know exactly where, but since there are outlets on this wall, there must be lines. I tried a line "filter", that I can't recall the name of right now, that made it worse. Thoughts? Better coax? reroute? Thanks

No, you just wanted instant answers

It would appear that the video cable is too close to the power cables?

But what do you mean by the low wall cable outlet? Which cable outlet, video? If power and video are in the same bay and next to each other, problems. Can you call back the electricians and ask if they know what they did back there?

 

[~JC~]

This is a wall that one can get to both sides of. The original cable outlet is separate from the power, and low down on the waal, as is typical. If you run the cable straight from this outlet to the TV, the pic is fine. (but the cable is running visibly up the wass to the TV. So the electrician punched through from the otheside, ran it along the baseboard to the appropriate stud bay, and then up in the wall to exit behind the TV, effectiviely hiding the wire. Since I recognize the interference as electrical, I was wondering if a coax exists that sheids against this, or do I need to experiment with alternative cable routes.

I didn't mean to sound pushy. Thanks for the response.

 

[mtrycrafts]

This is a wall that one can get to both sides of. The original cable outlet is separate from the power, and low down on the waal, as is typical. If you run the cable straight from this outlet to the TV, the pic is fine. (but the cable is running visibly up the wass to the TV. So the electrician punched through from the otheside, ran it along the baseboard to the appropriate stud bay, and then up in the wall to exit behind the TV, effectiviely hiding the wire. Since I recognize the interference as electrical, I was wondering if a coax exists that sheids against this, or do I need to experiment with alternative cable routes.

I didn't mean to sound pushy. Thanks for the response.

Naw, you weren't. Not sure if a better shielded cable will do it.
Since he ran it into another cavity, do you know if there is a power cable there?
I am also wondering if a ground loop cable TV isolator would not help:

http://www.cencom94.com/gpage.html8.html

I see the price may have gone up.

 

[~JC~]

isolator

I actually bought that cencom cable isolator, and it made the interference worse. It highlighted the interference bands. I talked to the guy at cencom. He didn't seem to understand, so I just dropped it.

 

[pikers]

I actually bought that cencom cable isolator, and it made the interference worse. It highlighted the interference bands. I talked to the guy at cencom. He didn't seem to understand, so I just dropped it.

If a signal cable crosses a high-voltage wire, cross it at a 90 degree angle, or 18" away.