Question about JBL PB12 Subwoofer

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Jbl subwoofer PB12

My subwoofer lights flicker on the front green/red/green. Also a clicking sound. It smelled like an electrical burn of some sort. no power surge. I took out the board and their is a black burn spot on the board. Can it be repaired? Thank you, Daryl

Posted by daryl schaefer on

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  • woekki Nov 28, 2008

    I have the same problem, when i give more input power, the woofer goes on green, no problem
    When i give no input he goes after 15 min switching from red to green and the woofer make plopping sounds

  • woekki Dec 02, 2008

    The solution below with the condesator c42 is for rev1, i have a rev2D amplifier thats total differend print and components, do anyone an solution for a rev2D PB12?

  • woekki Dec 02, 2008

    The solution below with capacitor C42 is for REV1 amplifier, I have an REV2D with different print and components
    Do everyone had a solution for an REV2D PB12?

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3 Answers

bratcop

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I had the same problem...replaced the C42 capacitor with one that I got from RS...fixed everything and all is well again. I only have moderate soldering skills, too, so if I can do it, so can you

Posted on Dec 01, 2008

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Michael Edwards

Michael Edwards

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Yes there are a variety of Capacitors that go bad on these amps - some have to be upgraded Volts wise and others are just the wrong value - it is a very poor designed amp to begin with . The amps do have issues that is for sure - That is where I step in - I can repair your amp and make it so it won't burn up (catch on fire) again. When the amp goes it burns a hole in the board - but it can be repaired. I have done several hundred and all customers are happy :) ... Look for my add here and also on ebay

Posted on Oct 23, 2011

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Anonymous

Replace c42 100uf 16v capacitor

Posted on Apr 12, 2008

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1 Answer

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You can download the service manuals here and read the service bulletin and check per manual.
http://manuals.harman.com/JBL/HOM/Service%20Manual/PB10%20sm.pdf

http://manuals.harman.com/JBL/HOM/Service%20Manual/PB12%20sm.pdf

Hopefully the ClassD module is not bad.
This is what I have done to my: http://s807.photobucket.com/albums/yy352/budm/JBL%20PB-12%20mod/

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My ClassD module shorted out (buzzing sound/blown fuse) and not availabled any more so this is what I did: http://s807.photobucket.com/albums/yy352/budm/JBL%20PB-12%20mod/
I would suggest to buy new one.

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

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

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