Humming noise from the back of the display. - Hitachi CMP4201U 42 in. HD-Ready Plasma Television

Check the speaker cables for connectivity. Be sure to securely plug in the stereo jack/s at the back of your pc

Possibly a bad cable or bad ground or bad outlet?. Easy solution, try a different outlet and see if the hum still exists. Also, make sure your speaker cables are NOT run parallel along with, or close to any power cables, Speaker wires can and will pick up AC "Humm" noise.

Depending on how the noise is affected by your driving, it could be an axle joint or the differential in the transaxle.
If it is coming from the back instead of the front you may still need hub bearings.

Probably drain pump issue lots of problems with these models access easy by the back of washer on the left hand side

possible start/run capacitor problem
call the ac technicians for a proper diagnosis

Check if the belt is fitted correctly and not broken.

the reason for it not displaying HD channels would be the Tuner itself, The humming from the back would be a fan that is dirty from dust or its is given out.

solution for the humming clean out the fan! check fan to amke sure its doing the right RPM rotations per min. For the tuner this would need to be looked at and tested by a Tv repair person.

Rulds2008

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does the hum occur when playing a dvd or only when watching tv ? if the hum occurs only when watching tv, i would like you to disconnect the cable line from either the wall or the back of the cable box and see if this hum disappears. if the hum disappears call your cable company. you have what is called a " 60 cycle ground loop ". hope this helps.

I left the unit unplugged over night, plugged it back in the next day and still had the same problem.

hi there the low humming noise that you are getting sounds like the fill valve, this could be due to you perhaps not turning the water back on after fitting the new dishwasher or the fill hose being kinked when the dishwasher was put back ,hope this is of some help to you.