Sharp 32C-240 32" TV "popping noise audio changing channel" Questions

...audio noise and coloured patterns or effects is if the tuner, or input circuits, are picking up from another TV station, or signal source. Satelite dishes for example do not focus sharp enough, so ...

if were bad, I would expect some noise/hum pickup from the low level audio stages. Get the part number off of the chip. If it is in a socket, check the contacts for corrosion or looseness. Good luck..