but i thought it was ok to take the ground off electronic equipment.....

I've just installed a plasma with the equipment about 20 feet away and there's a pair of bars running up the screen. No cable feeding this house - just DirecTV and a DVD.

OK I get the point. The plasma is over the fireplace. If it was over the toilet we could really be in trouble!
Seriously though, isn't the fireplace/chimney properly grounded, and isn't the chassis of the TV fastened to the chimney?
Is the interference basically the slight potential created between the two grounds (the chimney and the electrical ground?)

Two questions???

You say there are moving lines.... Meaning more than one? The 60Hz problems I have encountered typically consist of a single scrolling line. It will roll the entire length top to bottom. Do the lines you see roll the entire screen height or do they seem to start above the bottom of the screen.

Did you install the ferrite cores on the cables as specified in the manual????

We have seen the same problem with the Panasonics. Install the ferrite cores and the problem goes away. We install one ferrite on the power cable and on each input cable we are using. Eliminated the problem for us on many occasions.

Robbie S

We install the Leviton 5380 in every plasma that we do and it eliminates the 60hz hum pattern. Whether you use Cable, DSS, Antenna or NASA Mission control. The TV must be on the same circuit as the equipment. If the SAT feed has a different ground than the Plasma you will have the hum. Same goes for the Cable and Antenna system. Call Gray Bar Electric they have the Leviton 5380 instock. THey have 250 distribution locations in North America. Using the 5380 is the quick and cheap way to fix the problem.

http://www.graybar.com/

At the top where it says product search, type in "Leviton 5380IG" and it will show you the different colors it comes in. Call the 1-800 number and setup an account. Graybar also sells Leviton, Lutron, Russound, Lucent, Avaya, Siemons, Beldon, Carlon, Fluke, Hubbell, Millwaukee, reeline, etc. They are a great company to work with and have great tech support.

Mike

Bill Whitlock from Jensen Transformers makes REALLY, REALLY good reliable ground hum isolators for just about every application known to man. I would suggest checking out their products www.jensentransformers.com

Bill also holds a class at CEDIA that is really good too- Grounding and safe interfacing of A/V systems.

good luck

AVX,
The reason you see two bars floating up is that the power supply in all electronics is "full wave rectified" which gives a more efficient supply; however, the output of a full wave supply is actually 120 Hz. That's why you see two bars. I'd be seriously surprised if you actually saw one bar. Half wave rectified (60hz output) power supplies are never used off 120 volts if any serious power is needed, such as for a television or A/V component.

I did get a bag of ferrite cores with this Fujitsu and don't know if they even mentioned when or where to use them.

I'm running composite, S, and component to this display. Should I put a core on each one? At the source end, or TV end? Does it matter where along the power cord I place its core?

Sounds like there is one or more wires running close to the electrical for the lighting, or as others have said you are on the same circuit as the lighting. You might have an electrician pull the electrical panel apart and reconnect the plug behind the plasma to the same circuit as the rest of your equipment (as long as your equipment is not on the same circuit as the lighting).

I have been in the same situation, and running the incoming sat feeds through a Monster Power conditioner took care of the problem. But I have also had problems with the Monsters causing frequency drops to satellites or cable boxes.

Good luck.

Matt

Tom,

We have always put the ferrite cores as close to the display as possible. We use one on each input we are using as well as the power cable. We have placed them back closer to the equipment when there wasn't enough room at the plasma location for them. We have had great luck in clearing up audio, video, & electrical noise on plasmas and other displays.

Robbie S

Mike,
I'm still learning. I just got the plasma hooked up to all my components. And I do get the hum. How hard is it to install the "Leviton 5380IG"?
Do you know of any website that has a write-up on the install process?

I also have a couple of questions regarding cable splitters when using a cable internet splitter.
I could not find solutions to this problem in the forums.
If you would like, you could also email me:
[email protected]

The leviton 5380 installs just like a GFCI double duplex. It has a line and a load side. Assuming that the plasma is at the end of the AC line, take the neutral and hot to the load side, and the ground goes on the green screw. The black wire goes to the copper screw and the white wire goes to the silver screw. Also, is the hum pattern on all sources. If it is only on the cable box, then you have a problem with the cable ground. This can be fixed with an isolation transformer from many different manufacturers (Xantech, Leviton, Jenson, etc). Also check for the ferrite beads that come with the TV. Many times those can clear the lines up too.

As for the cable splitter, any high bandwidth splitter should work. Split the cable right when it comes into the house to provide the best bandwidth for the internet. Then run one side to the cable distribution hub, and the other to the cable modem.

If the Leviton 5380 seams over your head, any electrician or AV should be able to install it. Good luck.

Mike

Thanks Mike.
I'll let you know how it all goes.

By any chance, does the vw in your screen name stand for volkswagen?

No, it stands for Very Wise... nah Volkswagen

Ok.
Should I also be using ferrite cores on every connection to the plasma?
I have one installed on each speaker wire for the TV speakers.

Should I get Ferrite cores for the component/AV and DVI cables?

The 60hz hum that I am experiencing is from the dimmers in the house. Mostly from the ones closest to the Plasma. I can actually change the speed at which the bars move by sliding the dimmer up and down. Also when light are out picture is nearly perfect. Customer knows what the problem is but is putting off fixing at this moment due to the fact that he made me install equipment on the floor while cabinet is being built. I'm trying to convince him to use the levition 5380, but he bought a $100 monster cable clean power surge protector that he wants me to shove behind his plasma. So we will see how it goes.