Sounds like one or more boards in your signal process has failed, but most common is the Y-Sustain. When this happens, you only get audio and no picture when the TV is powered on.
Call LG and them know you understand this is a know issue for this TV and you're ASKING for a warranty repair of this knownn issue.
800-243-0000 Before you call be sure to have the complete model and SR number. Example 42PC3D UA.AUSSLJR, 809HJB2983485
Good luck.
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