Hi can anyone please give me any advice, have tried my best to sort it out myself but have now run out of ideas. I am running a Starview cable receiver through my 37” LG TV. The problem I have is a faint wide band which slowly travels up the TV screen when I view through my cable, (normal TV is fine) I dont understand what could be causing it I have already tried the following which have not helped. 1) Changed the lead from my outside cable junction box to my Starview receiver. 2) changed settings on my Starview box 3) changed picture setting on my TV 4) tried different cable inputs to my TV 5) moving other cables and wires away Im just about out of ideas now so if anyone can hep I would be very grateful Thank you
you have a ground loop problem you need to use a isolation transformer your incoming cable has to be connected to the transformer your problem is not caused by your tv
Hi Thanks very much for your help. Sounds like your right, I had some bad buzzing from the TV which I have now sorted with an audio isolator. That’s sorted the sound out so I guess im half way there. From what I understand a cable isolator would be quite expensive, any thought on the best place to look for one. Thanks again for your help
http://www.amazon.com/Viewsonics-VS...2?ie=UTF8&s=electronics&qid=1221350431&sr=8-2 Is that what you're looking for?
Hi Logik666, Yes this is the type of thing that I think will do the trick, thanks for pointing it out. Only issue is they will not ship to the UK. It seems very very hard to buy this type of item here. I have found one on ebay in the end but it took some finding
This problem is caused by difference in ground potential between your Audio/Video equipment and Cable Box. Why does this happen? This problem occurs because your home electrical system is grounded at one point (near main electical panel with a 8' to 10' copper or copper clad steel ground rod driven into the ground) and the cable ground block is grounded at a second point (seperate ground rod, or more likely a clamp to nearby cold water pipe) Which is where the term "ground loop" comes from. This difference in ground potential will cause hum in your audio and rolling bars on video displays. It is refered to as 60 Hz hum in the US, 50 Hz hum in the UK. One fix is to simply run a 8 gauge solid copper ground wire from the electrical service ground point, to the the cable ground block (located where your cable service enters the residence, when properly installed you should see two small coils of coax cable (so water will drip down and not flow into ground block) on either side of a small metal terminal block) The second is to run an 8 gauge wire from your cable box chassis screw to your A/V Receiver ground post or chassis screw and than additional gear until bars are gone.(no cable box, purchase and install an inline ground block, $3.00 US, and run wire from block to receiver, etc.) This gives the voltage an easier path between equipment, and since voltage will always seek the path of least resistance this will usually work. Voltage of as little a 1 volt can cause this problem. The third, and last option, would be isolation transformers of the type you have been discussing. Hope this helps. Regards, Bob
