Question about LG 42LG50 42 in. LCD HDTV

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I am getting a very loud hum from the speakers on all channels also bad picture distortion. I have tried other TVs in the same position and with the same connections and they are perfect. The TV is connected to Virgin cable.

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Change speaker of your lcd it gone damage

Posted on Jun 02, 2010

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Posted on Jan 02, 2017

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I have kenwood amp m-a100 which has loud buzz / hum on all channels and distorts radio very badly can you help ?


The loud hum will be probably caused by the Large Electrolytic Capacitors in the Power Supply section. All of them will need to be replaced to be on the safe side. The buzz noise is caused by the fact they are letting in the 50/60hz mains. Hopefully that should clear everything up.

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Why is my tv blurry and distorted? We have reset all settings. Still blurry.


It looks like a light shining on the screen when you were recording the problem.Also, you are taking the picture from a bad angle for lcd types of tvs.Try a new recording,also get the tv on an HD channel for a better,clearer picture.Many hd tvs look bad on non HD channels.

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I have a hitachi rear projection tv. Model #51f510. Picture is bright and clear but goes to distorted when you change the channel. If you turn the tv off then on its worse. Then again turn the tv off then...


Try tapping/knocking on various parts of the TV to see it a bad solder joint is responsible. It could also be some component getting too hot or aged to the point of malfunction.
Don't waste any money trying to fix this, rear projection TVs are dinosaurs.

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Altec Lansing GT5051, I'm hearing a humming noise from the speakers as soon as I turn them on. The humming noise is heard even if speakers are not connected to source.If I try and play music with...


Sounds like a problem in the speakers' internal power supply, maybe a faulty capacitor. Speakers need to be looked at by a technician, or replaced with a new set.

Jun 05, 2011 | Altec Lansing GT5051 Computer Speakers

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Wires to main speaker are, Yellow & Blue witch one is the positive ?. Also I am getting distortion from the clean channel even at low volume, the speaker is Peavey 1230 model 8 ohms.


Yellow should be the positive. Try plugging in and reversing. The louder of the two is the one in phase and the correct wiring. If the speaker is pushing out when playing , it is in phase and correct also.
The distortion problem could be a speaker going out. It may not be totally blown, but may be verging.
Holding your hand out as wide as you can push against the speaker lightly. If there is a rubbing or scratching sound, the speaker could be damaged.If it moves freely, and there is no scratching its okay.
Another possibility is the clean channel may have a channel volume set to high. Make sure the clean channel volume is set lower than the master volume otherwise you can get distortion on that channel too.
Good Luck.

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When I connect the handicam to the tv there's a low hum. When I press play the hum gets louder and the picture is distorted. Any idea what is causing this?


Could be feed back from the drum assy(video head) going bad. Make sure that the 2 devices, your tv and camcorders audio are in sync by turning the audio all the way up on the camcorder and then turning your tvs audio up as loud as youll listen to it then backing the audio down with the camcorders controls. If that doesnt get it then your video head may be going bad. I hope this helps.

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2 Answers

After the set has been on for a time (usually 5-10 minutes) an audible hum appears and continues.


Hello,
this may be due to an alignment problem in the IF/audio demodulator, a bad audio IC or other circuitry, bad connection, or a defective speaker.

If your TV has an earphone or audio line out jack, try this to see if it is clear. If so, then your problem is in the final audio amp or speaker(s).

If only one channel of a stereo TV is affected, it is almost certainly the audio amp or speaker for that channel. Interchange connection to the two speakers temporarily and see if the problem moves.

If the problem is at all intermittent - try gently whacking the TV - then it is likely a bad connection - either a cold solder joint or a dirty or tired IC socket.

The audio amplifiers in newer TVs are almost always ICs and replacements are usually readily available. If the IC is in a socket, remove the IC, clean the pins and socket contacts and reinstall it. Sometimes, the contacts on old socket lose their springiness and do not provide solid connections. Such a socket will need to be replaced.

If the set uses discrete transistors, it s also possible for one of these to become noisy.

There could also be bad electrolytic capacitors, probably in the power supply area. Even though you might think this would result in hum and there is none (even when there is no audio in the program or the sound is turned down) dried up caps can result in distorted sound that may sound like a sort of clipping. An ESR meter is best for testing (with power off!) but carefully jumpering known good caps across suspect ones (again with power off, then turn on the set and check), will eventually find the bad one(s).

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Speakers don't respond to volume control


Try cleaning out the boombox. If you're still having problems then they might be bad speakers. Try replacing the speakers. I think they might need desoldering.

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Loud hum on subwoofer.


try another speaker on that channel if you get no sound or it hums then it is time to take your set to a tech your audio out put on that side is damage along with some caps.good luck.

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