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TVs can also hum from a non-capacitor related issue known as intercarrier buzz. That buzz can not be fixed with caps and sometimes simply can't be fixed. If there is constant hum regardless of wheather the set is connected to a signal suspect caps, but if the buzz comes and goes with picture content(high contrast lettering tends to make really loud buzz) then it is the intercarrier buzz that is normal on many sets. The buzz and hum sound similar, but different so with experience one can tell which it is by ear.
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