Today I unhooked the AV system from the coach power and plugged it into an external source. Still no change in the picture. So I'm assuming the noise is coming from the coaxial cables and not from the power cables. You guys may have been saying that all along and I didn't understand. I have two LED tvs in the coach that aren't drastically bothered by the lines. The only major complaint is the plasma. Should I just plan to swap the plasma for an LED? Should I call Xantrex and ask them for assistance? Would temporarily grounding the inverter/charger to a ground rod help trouble shoot? Thanks again.