Not going to be an reset but you can try ... the reset on LG is unplug the tv power hold down the power button for 30sec's while still holding the power plug in the TV and hold for another 20 to 30 sec's then try and turn it on.
if i remeber right the LG50 is an LCD you will more then likely need eather the power board or the main board ...no way to know with out opening it and testing afew things (helps to be LG trained also :)
good luck
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