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The first that springs to mind is electromagnetic interference. Speakers, amplifiers, florescent lights in close proximity can cause this. I even saw a TV that had been fixed to a wall adjoining the next door neighbours who had put his TV in exactly the same position and the interference passed through the wall.
Try moving the TV location away from all sources of interference (including Cable boxes, Video recorders, etc.) Does the problem change or go away?
Is the TV grounded properly? Interference needs to be siphoned off to a ground. if you put your hand around the cable that feeds the TV a video signal does the problem change or reduce?
Another issue may be some form of video post-processing going on causing the shimmering. Some forms of image smoothing software built into the TV can cause this. So try shutting down any features on the TV, does the problem go away?
On a big TV that is fed a low resolution video stream you will always see what the industry calls "artefacts". These are distortions caused by the transport compression of the video signal. there is no way around these except for receiving a better resolution picture stream.
The TV could be wired to same breaker on the furnace. Or the cable line maybe cut or rubbing on electric line for furnace which can cause interference. Check each wire make sure there isn't any bare wire showing. good luck
Your TV is probably getting interference from electrical appliances that produce electromagnetic interference. These includes fluorescent lights and electric motors such as water pumps. Cars, motorcycles and other things the emits electromagnetic signal can interfere with your TV. Check for any new electrical installations within 5 meter radius or any newly connected appliance on the branch circuit where your TV is plugged. Disable if there's any then operate the TV. If your TV is not mounted on the wall, try moving it to another location to check if this is the cause of the problem.
There must be a fault in the screening of the internal wiring to the scart outlet in the home theatre system. I simply changed the way the player was connected to the TV and the interference disappeared:-
1.) I used the RCA video outlet instead of the scart lead. Picture quality was not compromised. FYI the Panasonic Plasma TV I have has only RGB video input sockets at the back, so I used a scart to RCA adaptor to overcome this problem of connecting old technology to new.
2.) The surround sound when playing DVDs is generated directly from the home theatre system so there was no need to connect the audio from the home theatre system to the TV
3.) I used a pair of RCA leads to connect the "audio out" from the TV to the "audio in"on the home theatre system to provide the option of TV sound through the home theatre system.
It sounds like HD mode on the TV operates at a different frequency (refresh rate) that then causes interference to your nearby police scanner. There's not much you can do about this--the HDTV design cannot be modified.
Your best solution is to try moving the police scanner further away from the TV. I doubt there is any kind of barrier that you can place around the scanner that might block the interference (the "noise" given off by the TV is likely omnidirectional).
Which receiver do you have? If you have a 29110, it may be that you have a florescent light or natural sunlight interfering. This may also attributed to an LCD or Plasma TV. If you have a 29180 it may be plasma or sunlight interference. If either one of the above is true you may want to consider the 29195. This may also be true with the two receivers connected together. Hope this helps.