Question about LG 42PG20 42 in. Plasma HDTV

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Humming from back of tv

Hi, I just purchased a 42" plasma around 2 months ago and all of a sudden im hearing a loud humming coming from the back. the sound comes and goes but it mostly comes. It does go away for some time if i tap the back. what is this sound?

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  • Anonymous Apr 12, 2009

    just bought a 42" vizio plasma tv, and i got the annoying bzzz too, if i turn it off for a little while and yurn it back on, no bzzz, but after a short while, bzzz is back!!!! aaaahhhhhhhhhhhh, so annoying!!!

  • ninoamigo Apr 15, 2009

    lg please improve

  • Anonymous May 04, 2009

    Hi I have the same problem, starts buzzing after some time, switch off for a while and it fixes the problem but only temporarily. jscruggs420, specifically do you mean there is a problem with the power supply? how can I fix this is it a case of the capacitors failing?

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  • 36 Answers

Sounds like your powerboard, you can try a cheap fix by putting a small fan behind the tv on low and see if that helps. Also I would not settle for this and call in the warranty and get it fixed while you can.

Posted on Jan 18, 2009

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How do I fix loud humming noise in my DLP HLP4663W 42 IN Samsung TV?


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I have a 42 inch Hitachi plasma tv that is making a very loud static noice coming from the internal speakers. It stays at a contstant very loud volume unless I completly mute the tv or turn the volum


Based on what you have tried if a buzz or loud static via the speakers you have something wrong in the audio output circuit of the set--problem here is that circuit may be part of the Main board that processes all signal---a look inside---following the speaker leads back would lead you to that board.

A simple thing to do to narrow it a little (you may have done this) is with sound all the way off put your ear to the internal speaker--hear anything at all like a deep hum?

Depending on age of set and cost of the board likely bad it may or may not be a do it yourself repair.

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Humming sound


Samsung states - A buzzing sound from your plasma TV is normal. It is caused by the electrical charges used to create the images on the screen. The buzzing, however, should not be so loud that you can hear it when the volume on the TV is set at normal levels.It is also important to determine the type of buzzing sound. A sound like a ground hum is completely normal. This buzzing can originate near the power cord connection or from the SMPS board position on the upper back of the TV. The buzz will be more audible as contrast increases on the screen, most notably when displaying an all white screen. If the buzzing sound is loud, you may have the Contrast set too high. Lower the contrast to reduce or eliminate the buzzing.You may also have loud buzzing if the rear of your Plasma TV is too close to a wall or other hard surface. Try moving your TV away from the wall until the buzzing is minimized. [1]
If the buzzing is at a higher frequency and resembles a crackling sound (like the sound of Velcro being pulled apart), and originates from the upper middle back of the TV, you likely have a failing SMPS board. Place a support call with Samsung to have the SMPS board replaced.FP-T5084 Have a known buzzing problem with a very simple fix.If the buzzing is coming from the left or right sides of the rear and the volume can be changed by pressing lightly on those locations, you are probably hearing the vibration of the grounding springs on the back panel. Call Samsung (or whoever) and have a technician confirm the problem. The easiest fix is to insulate the offending spring by applying some felt tape.

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caypianan@yahoo.com

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1 Answer

Brand New and already broken


There is a short on one of the boards. The power supply may have also been damaged. You should take the set back to the dealer for an exchange.

I would sugget to buy a quality brand name if you want high reliability.

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Hello
You will have to a tec. for this one as you have lost half of your vertical sweep.
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We usually find this is the cabinet back rattling. To confirm, when this happens turn the volume on the set all the way down and see if the problem is still there. If it is still there the put your hand on the back of the tv and gently press to see if the buzzing goes away. If the sound does go away the cure is to loosen all of the back cabinet screws around the edges of the set and gently push on the back as you tighten the screw. tighten the screw in an order much like you would tighten the lug nuts on a tire. in other words thighten the top left screw, then the bottom right screw and kepp alternating as yougo around the dabinet back untill they are all tight.

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