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JBL PB12 subwoofer rapidly turns on and off, sound distorted.

I have a JBL PB12 subwoofer. The led's on the front rapidly flash from green to red and the sound is very distorted. Is this fixable? Worth fixing?

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budmrtn
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SOURCE: JBL PB10 subwoofer sounds distorted and lights on the front flash

More likely to be the Class D power amp module, but you should look through the service manual to make sure all the parts are installed correctly. My PB10 AMP module went out and you cannot get one anymore.
http://manuals.harman.com/JBL/HOM/Service%20Manual/PB10%20sm.pdf

Posted on Nov 10, 2009

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1 Answer

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First try to find the source of your problem. The easiest way would be to try your sub with a different audio source to see if the problem still occurs but is sounds more like there's a problem with the receiver.

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Here are the service manuals, you may what to read the service bulletin section. Most common failure in the PB10/12 is the blown ClassD amp module which you cannot get it anymore. This is how I fixed my: http://s807.photobucket.com/albums/yy352/budm/JBL%20PB-12%20mod/

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http://manuals.harman.com/JBL/HOM/Service%20Manual/PB10%20sm.pdf

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if your serial number starts with ha then it's probably a bad capacitor C72 . 6.8uf 100v np electrolytic. replace it with a higher voltage capacitor of the same value.

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yes it can be repaired. but i need more details on this...

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