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Scratching sound comming from 1 channel

After few minutes of playing the amp i start to hear a scratching sound comming from left channel speaker

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Faulty op amps, needs to be repaired

Posted on Sep 09, 2008

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Posted on Jan 02, 2017

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Right speaker terminal not working - tested out both speakers and they work fine when independently tested on the left speaker terminal. Sony MHC GX45 Shelf System, 2 speakers and 1 sub.


If the sound is also dead on that channel on a pair of headphones. Then you have probably lost the main power amp for that channel. To be certain. With you headphones on, slide or turn the balance control so you can only hear the faulty channel. With some music playing turn up the volume. If you can hear "faintly" music playing then the pre-amp is OK and the power amp has gone.
The power amp will be located on a heat sink. It will consist of 4 transistors (2 for each channel) or one big device (or two) (an IC). If it is transistors you only need to replace the two for the right channel.

Aug 31, 2013 | Sony COMPLETE PWB, MP-45 Shelf System

1 Answer

No sound from front left channel


Hi, here is a procedure to discover the source of the problem. No sound from the left front channel can have several sources other than the left front channel itself.
Let's assume, for just now, that the speaker is good and the cable to it is good.
Here is a testing sequence to follow:
1 If you have a CD player connected to it. Put a CD in and put it into play mode.
2 reverse the connectors from the CD player to the receiver. See if the sound moves to the left speaker and stops on the right speaker. Or if it plays fine.
3 If the sound reverses channels, That cable is bad. Replace it
4 If the sound is still not coming from the left channel. Check the connections and cables to the speaker. MAKE SURE THERE ARE NO STRANDS OF WIRE TOUCHING THE CHASSIS OR SHORTING TO THE OTHER SPEAKER WIRE.
5 If there were. Correct it. Shut down the receiver and then after a few minutes turn it back on.
6 If it still does not work. check to see if a tiny amount of sound is coming from the left speaker.
If so, turn the music up and see if it pops back on . If that is the case there is a failed resister on the circuit board that is arcing when you turn up the volume. That being the case, it is time to drop off the receiver to be repaired in the service center.
Hope this helps,
Best,
Mark

Jan 04, 2011 | Harman Kardon AVR 330

1 Answer

Erratic volume from new turntable thru used amp


First detirmine if it is only the turntable that is causing this problem, by connecting something else to another terminal. If that works fine it will be the cartridge preamp that is causing the problem. From what you describe it sounds like an IC that is playing up.
If the other device plays up as well as the turntable, I still suspect an IC, but this time in the main pre-amp. The reason I suspect an IC is that by the sound of things both channels are playing up and therefore it has to be somepart that has both channels going in and out of it- thus IC!

May 08, 2010 | Audio Players & Recorders

2 Answers

I have a Denon AVR587 running in 7.1. I have an unusual problem as the rear channels seem to play all sounds at a higher pitch and lower volume than all the other speakers on the system. I am using a voice...


Hey ajn1n1 we need to fine where the tinnyness is coming from Lets do a test shall we,

hook up your voice matched polks to your front left and right speaker outputs on your amp to see how they sound as mains. if you hear tinny then its the speakers. sometimes speaker need to be broken in a bit.

hook up your main front left and right speakers to your rear outputs. if you hear the tinnyness then its the output of that channel on the amp or a setting. Newer amps let you change speaker sizes in the menu so that it can change over the crossover for that channel.

Dec 11, 2009 | Denon AVR-587

1 Answer

DVD plays partial sound


Check your speaker connections it sounds like you have a 5.1 or higher sound system. 5.1 means left front speaker, right front speaker, center speaker, right rear speaker, left rear speaker and subwoofer.

Voices in movies all get channeled to the center speaker (you can usually hear it a bit from the right and left front speakers as well). If your center speaker is disconnected or not working, you will only hear the background sounds.

Sep 20, 2008 | Compaq Presario 5000 PC Desktop

1 Answer

Scratching sound in speaker conected to left channel


invert the speaker cables if the problem went to right speaker you will find a problem in your left speaker(cable or speaker)-if not you will have a problem in your amp itself.

Jul 06, 2008 | Behringer Audio Players & Recorders

3 Answers

RADIO SHACK TRC-447


A number of things....faulty speaker (you can scratch test this with a torch 1.5 volt cell....cell pos goes to 1 speaker terminal
and cel neg goes to other speaker terminal..you can conect it any way around with flying leads from the cell...just keep touching the terminal with one flying lead...you will hear a scratching sound in the speaker) have your mike checked...test the tx/rx relay on the circuit board for tx/rx switching, or, a failed
driver transister in the output stage....the list is many
Cheers flyingfox@people.net.au

Jun 21, 2008 | Radio Shack TRC-447 CB Radio

1 Answer

Lanxar VW12D no sound after excess play


I'm not understanding what you mean by the "Sub doesn't even sound blown" if it doesn't play at all. One thing you can check is if you gently push in on the cone you shouldn't hear anything, if you hear a scratching noise and can feel resistance then you have a problem. If you have an OHM meter, you can check the voice coil impedance, it is a down and dirty way of checking to see if it is good or not. Measure all of the voice coils that you have and they should all read about the same, not necessarily exactly the same but pretty close. This test should tell you a lot. If it seems to test out fine there is something wrong else where. Let me know if you need more help.
-Andrew Hawkins

Apr 03, 2008 | Xtant A3001 Car Audio Amplifier

1 Answer

Kenwood Receiver KR-V127R - left channel not working


Select an input that is not connected, for example select CD with no cables going to the CD input on the backside. Will you then hear equal humming on both channels? If so, the amp stage is ok,
and the problem lies in the signal level circuitry.
Open the cover and use a plastic (insulated) stick to touch suspectible cables and components. When the sound returns, you've found the cause. Resolder or reseat the component/cable/card.
Use the insulated stick, NOT your fingers!

Dec 31, 2007 | Audio Players & Recorders

1 Answer

Only left/right have sound during the test


all of the channel are resonding to the test. but you cant notice it bec 5.1 speakers, each channel are designed to respond to a certain frequecies.  the L/R channel your talking about have the mid-range frequecies so it responds clearly compared to other channels...

 

hope that helps...

Oct 16, 2007 | Logitech Z-5500 Computer Speakers

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