Quote:
Originally Posted by John
Try unplugging the analog coaxial cable and see if the changes anything. Switch to an unused input at the same time.
You can sometimes get noise from two grounds.
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I agree.
Disconnect the coax cable (Shaw) cable. If the hiss stops, you've a ground loop. If you have a ground loop caused by the Shaw cable connection, you can get something called an isolation transformer:
http://www.rpelectronics.com/English...ems/75-504.asp
Note that this will attenuate the cable signal a bit. Also, the linked item is marked "not for digital signal use" so it might not be useful if you have, or are planning on having, a Shaw box behind it.
The only thing that throws me is this: if you mute the TV, the hissing stops... If you do have a ground loop, the hiss or hum will always be there as long as the ground loop is there.