What is popping? Do you hear popping from the speakers or the back of the TV? You could have a serious issue on the power supply of the TV making this sound. Below is a link to the power supply for that TV.
http://www.tristatemodule.com/p-26991-lk-pi400112z-westinghouse-tv-module-power-supply-cqc04001011196-eldft406-cw40t2rw.aspx
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