Question about Coby DVD-755 System

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Hum from speaker

I have never heard all five speakers work on this system, and there is this highpitched noise, It is annoying me to the point of wanting to get rid of this system and never buy anything coby again.

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I'm having trouble with getting all 5 speakers to work Cobys website says that you have to change the audio output but I have no idea how to do this

Posted on Nov 03, 2008

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No audio come out in speakers.


change the input. Amp could be blown. the speakers should have some type of hum when volume is turned up.

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move ur speakers around. if the noise is absent on some places u can be sure its the digital box. or one fix that might work is - get aluminium foils and wrap ur speakers. this can blank out interferences. if that works, open ur speakers and line the walls with thick aluminium foils. hope this helps.  

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Is this only with CD, only with THAT CD, or with nothing in particular selected or playing?

Check all connections for tightness as bad cable shield connections will let emitted noise into the system. Ditto for signal or speaker cables routed near power cables, TV's, other electrical sources.

Sometimews reversing the AC power cord polarity can resolve buzz/hum.

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Disconnect the device (amp or TV) that is feeding the speaker system. Turn on the power and see if there is still a hum. If the hum is no longer present, then the hum is most likely from the source.

If the hum persists, most likely the power supply has failed, or the output section has a short. You should contact the manufacture for support. They will most likely recomend that you give the unit in for service.

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I was moving around my large woofer speaker last night and then all of a sudden the unit went into protection mode. I tried all the various solutions posted on here and nothing worked. Then I went back to my speaker connections on the woofer and unplugged them and plugged them in again and it seems to be ok now. Very annoying problem. Can I suggest unplugging all the speaker cables and replugging them back in. Also another solution may have been holding down the power button when powering up the unit. Give all the above a try.

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I need help


it could be that the wires on the back of speaker are not fully connected or the speaker is blown and maybe try and swap some of the speakers around to see if its the speaker or the amp

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on what cd dvd ? cheak cable 1st rca swap out

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1 Answer

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IF it was too load you probable blew the speaker Just disconnect the side that is making noise or is it both side?

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