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JBL Sub 135 red light stays on green dosn't light up,speaker put out a thump every few seconds

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: 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.

Posted on Aug 09, 2007

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SOURCE: jbl PB12 powered sub woofer

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.

Posted on Jan 05, 2008

  • 5 Answers

SOURCE: jbl sub 135 motorboating b4

Turning the unit on without any input signal, the speaker did the pop and scratching sound. I found on the limiter board ( small pc board on the main input pc board) that there is a wire jumper on the back side of that had a cold solder joint. You will have to clean up the glue that was used to hold the wire on the back side of the board. I just replaced the wire with new one.

Look at the +15vdc off of Q117, I moved it to the left side of the pc board and added a heat sink to the unit. The 1 watt resistor created some cold solder joints that you will have to check.

hope this helps

Posted on Jul 18, 2009

  • 1 Answer

SOURCE: My JBL Venue Sub 10 light stays red, will not

i have the same problem. don't as yet have a solution

Posted on Apr 17, 2010

idrvnsx2
  • 60 Answers

SOURCE: Jbl sub woofer

Has nothing to do with the signal or source - it is a failure of the turn on circuit - I repair this amp - can help if you find my add here or I am located on ebay as well. Juust do a search for We Repair JBL and find the model :)

Posted on Oct 23, 2011

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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.

Oct 18, 2012 | JBL PB12 Subwoofer

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No power jbl speaker


that was mean has shorted line, check for shorted amplifier ic.that was mounted in big heat sink.

Aug 16, 2012 | Audio Players & Recorders

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Receiver does not recognize the subwoofer


So when you power on the sub and put the rca cable into the amp do you get red light only - never goes green or does it flash ?

Dec 23, 2011 | JBL PB12 Subwoofer

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I have a jbl sub that has worked perfectly for a few years and I havent used it in a few days. When I tried to use it there was no sound but the power light is green...what could it be? I checked the fuse...


Check that the audio source is feeding the sub is wired correctly and that there is no problem with the leads if you still have no joy and you have a multimeter check that the speaker isn't blown allthough it would be very odd if it was it still rules it out. after this you could be looking at any number of problems IE bad joint on the circuit board blown parts the list is endless try the simple sollutions 1st

May 16, 2010 | Audio Players & Recorders

3 Answers

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

Nov 10, 2009 | JBL PB10 Subwoofer

1 Answer

Pb12 makes thumping sound after warming up


Hello there..Thats normal only if your sub volume and the pre amp is turned up..Your amp is the cause of the speaker jump..Turn amp volume sub level down a few and check your wire from sub to amp..If all of that is good is a normal operation for pre amp warm up in sub if level is turn to max..Try unplugging amp freom sub then turn sub on stand alone(just sub outlet plugged in and no wires from base amp plugged in..If sub stops the its the amp making the problem..If it still is there then the pre amp is either dusty on inside or the outlet plug that it is plugged in doesnt have a good ground..Hope these help to solve your problem..Have a great day...

Apr 02, 2009 | JBL PB12 Subwoofer

1 Answer

Jbl sub woofer


Has nothing to do with the signal or source - it is a failure of the turn on circuit - I repair this amp - can help if you find my add here or I am located on ebay as well. Juust do a search for We Repair JBL and find the model :)

Sep 03, 2008 | JBL Northridge E 250P Subwoofer

1 Answer

Thump at the time of shutoff


The amplifier in the sub as with any other amplifier has a capacitor in it. Essentially a battery that holds a charge. When you trun things off such as subs or amps with a powerstrip instead of the intended on off button, the power supply has been cut, but the capacitor is still energizing the unit. So it catches the noise in the line.

Mar 07, 2008 | JBL PB10 Subwoofer

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