iwire said:
Actually without the third prong you can not have a ground loop.
Often you will find peoples low tech / unsafe solution to a 'ground loop' is to eliminate the ground with the power supply conductors.
Sorry but you are incorrect there sir!
Current flows from the TV hot lead through an EMI filter capacitor out down to the internal chassis ground then out through the cable in shield, to the cable bonding point,then to the service bond, to the neutral then back to the TV set. A complete current path that allows 120Hz ripple to flow through the shield. This then corrupts the video signal.
Ground loops mean many things to many people. This is one instance of current flowing through a shield and commonly referred to as a ground loop.
Ask any custom A/V installer.