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

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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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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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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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Replace c42 100uf 16v capacitor

Posted on Apr 12, 2008

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1 Answer

JBL PB12 will have loud thump or pop!
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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I have a JBL subwoofer and it the green light keeps flickering red , the sound is mimimal and if i turn it up it pops n cuts out , unable to get much volume from the speaker.
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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JBL PB12 is 10 years old and I have red lights but no audio.
Service manuals: http://manuals.harman.com/JBL/HOM/Service%20Manual/PB10%20sm.pdf
http://manuals.harman.com/JBL/HOM/Service%20Manual/PB12%20sm.pdf

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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I have a JBL PB12 it works for a few minutes then it shuts off and on and the lights on the front flash red, green, red, green..... why is this? Is it something I can fix or get fixed? I don't realy have...
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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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

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I have a JBL PB12 the green lights are on but no sound?
More like to have bad Class D amp module, common problem with PB-10/12. I modified my, http://s807.photobucket.com/albums/yy352/budm/JBL%20PB-12%20mod/

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

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

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Jbl PB12 powered sub woofer problem
These subs have had many problems, all associated with the amplifier section. PB 12's with an "M" as part of the ser. no. were assembled in Mexico and these are the ones with the amp problems. JBL fixed mine and sent it back no charge, BUT it cost me nearly $100 to send it to them in the first place. I have another one that has had no problems at all. Try sending it back for repair. At best you'll get a rebuilt unit back, at worst a substantial discount from the company for a new sub.

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