Question about Audio Players & Recorders

10 Answers

Behringer Truth B2031A Active speakers appear to lose power or cut out after 4-5mins playing time. Both speakers are affected but not exactly simultaneously. Is this a recognizable fixable problem?

Posted by on

  • 4 more comments 
  • wwetheri Aug 31, 2008

    My monitors do the exact same thing. It's not the power that they're plugged into, as I have them running through a Furman power conditioner. And I don't think it's the cables to my interface because they're brand new. Also, when I turn them off then back on again after 10-15 seconds, the woofers make a loud thump sound. 

  • mysteryraza Jan 21, 2009

    TRUTH B2031A''' I got the same problems,,,aparently something is getting hot because when i put a fan direct to the circuit board on the back of the speaker the problem goes....

  • mysteryraza Jan 21, 2009

    TRUTH B2031A'''' Just one monitor goes 1 to 4 minutes after is poweron, no matter is playing or inactive , or if the switch is set to AUTO Or ON.. when a air fan is focus to yhe circuit board the problem goes.....could be an insuficient heat disippation__

  • Anonymous Apr 28, 2009

    One of mine does a very loud "THUD" in both LF and HF (even with LF service switch to off). The Limit light comes on. I suspect a bad Electrolitic capacitor, and there is a few in there.

  • Aidan Ginty
    Aidan Ginty Jan 01, 2014

    Same here

  • Aidan Ginty
    Aidan Ginty Jan 01, 2014

    Same here. I switch it on, and then after about 10 seconds both speakers (HF and LF) emit a thud, the limit light turns on and it does nothing. When you switch it off, the device then makes a crackling noise. This happens regardless if anything is plugged in or not.

×

10 Answers

  • Level 1:

    An expert who has achieved level 1.

    New Friend:

    An expert that has 1 follower.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

I got it fixed for 2 weeks now. All I had to do is to put two small heat sink on the 78xx and 79xx TO220 regulators. It still is a sign that something else is failing, but it does the trick for now.

Posted on May 20, 2009

  • jevan50 Nov 13, 2009

    I'm back again. I did replace both 7815 and 7915 regulators and it look like it has fixed it. When troubleshooting, use some freeze-it directly on the regulators and see if it prevent the speaker from going into limit.

×

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

I had the same problem and when I switched the "Power Mode" switch on the back to "On" rather than "Auto", they worked just fine. I hope this is helpful! 

Posted on Sep 02, 2008

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Jevan50 thank you so much for posting! Same exact issue one speaker. The 7915 was at fault and my original part was a ML7915A by Micro Electronics. It has their logo on it. Here is what my volt meter showed:


Before the dropout, voltage is as follows:

7915A - Pin 2: -33.3V, Pin 3: -14.9V. (Pin 1 is ground)

7815A - Pin 1: +34.1V, Pin 3: +15.0V. (Pin 2 is ground)

After the dropout:

7915A - Pin 2: -39.3V, Pin3: -0.8V.

7815A - Pin 1: +32.8V, Pin 3: +14.9V.


As you can see the 7915 lost voltage on the out PIn 3. You can google spec sheets on all of these. I found a replacement part from Parts Express part #7915 which was a LM7915C for 75 cents. I got a couple and some 7815's just in case. Don't know the manufacturer, I couldn't match the logo. But it has a metal heat sink, unlike the original plastic one. Don't forget to get some thermal paste, as you will have to remove the three chips that are bolted to the main heat sink in order to get access to the 7915 solder points. And yes, not so easy removing and re-soldering a part that has 3 solder points. But this has saved me so much time and money. And sorry to say, you get what you pay for... (I also have the known radio interference with these monitors, but is very slight)


Thanks again jevon50, you're a genius!

Posted on Nov 06, 2010

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Where did you buy the regulators

Posted on Dec 08, 2014

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

About the RADIO INTERFERENCE... If you remove the plug from the speaker cabinet to the circuit board that operates the power and Overload LEDs, it will remove the interference. I blacked out my LEDs with a magic marker before I made this mod, so not having the LEDs function isn't a problem for me. I find most LEDs (especially the blue ones) super annoying. Remove the plug, and you will no longer have to put up wit unwanted Lady Gaga music bleeding through.

Posted on Jan 20, 2012

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 3 Answers

I have the same issue, sound cuts out after 3-5 mins, it does seem to be those two regulators getting a little hot, ive put heatsinks on them and it has been fine for weeks...

Posted on Dec 23, 2009

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I have the same problem and reckon jevon has the correct solution as I monitored the output voltage of the negative regulator and it dropped to near zero when the unit switched to 'overload' . A couple of quick questions please jevon.

Did the heatsink solution work totally , or is replacing the regulators the only way forward?
Did you replace then with 1 amp or 2 amp regulators.

Thanks in advance

Posted on Nov 27, 2009

I have one that does the same thing, when it warms up, the red "overload" light goes on, the woofer thumps, and that's the end of the sound. Turn it off and then on and it takes about 15-20 seconds to thunp and go off again, but when it hasn't been turned on for a long time, it takes about 5 minutes; obviously something is getting hot, I wish I knew what so I could replace it.

Posted on Sep 18, 2008

  • jevan50 Oct 17, 2010

    I've replaced both regulators in the defective speaker and it fixed it. 7815 and 7915.
    Enjoy

  • Danyel Nov 06, 2010

    jevan50 see my posted solution above. Your solution worked perfect. Thanks again!

×

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Bord problem

Posted on Mar 01, 2012

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Hey, i have one of my B2031A's a little far from the AC and the sub just goes off after every while and i have to give it 10-20 min to reset other wise the sub doesn't come back now, it has completely gone off and only the highs are working i saved money to get them and now one of them is sh**ing up looks like the germans need a little lesson in audio, plus there is no circuit diags available which is really, really Sad.

Posted on Jul 02, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Beringer truth b2031a does not power up


Check and replace damaged component/s at its main power supply section. Contact any service technician. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts. Do asearch by type in the brand name of your device at its search box.
http://electronicshelponline.blogspot.com/

Jul 03, 2014 | Behringer Audio Players & Recorders

1 Answer

Behringer Truth B2031A major hum in both monitors


Could be when the power outage the speaker was blown a little. If not check the wire connections.

Sep 10, 2013 | Audio Players & Recorders

1 Answer

Where can I find the entire circuit board for TRUTH B2031A


Unfortunately Behringer equipment is hard to get parts for generically. You may be able to order the whole amp from behringer but I doubt it. I have had lots of problems repairing them for that reason and I will no longer use any of their stuff. The IC's could be repaired but can't find any record or crossover to any of their output transistors. It appears they are custom made for Behringer. Sorry, I can't help any more than that.

Mar 28, 2013 | Behringer B2031a Truth Active Monitors

1 Answer

The speakers were damaged by rates


www.soundmastersdirect.co.uk sell behringer spare parts. give them a call.

Mar 07, 2012 | Behringer Truth B2031a 225-watt Powered...

1 Answer

Just bought a pair of used Beringers Truth b2031a monitors. one of which doesnt work anymore at all... opened the back of it (took those 6 screws out) and saw that the power connection has been cut of......


Here is the service manual schematics for your speakers:

http://elektrotanya.com/behringer_b2031.pdf/download.html

Scroll doen to "get manual" and click on it to download the manual... Do not click on the other downloads at the site, they are for viewers you don't need.

Take the schematics to a COMPETENT electronic service technician to get units repaired. You obviously bought units that had been hacked before...

Jun 21, 2011 | Behringer Truth B2031a 225-watt Powered...

2 Answers

Where can i get a behringer b2031a schematic


i found legit looking schematics here...the pdf includes many revisions, adding to their credibility...haven't put them to the test...
http://www.electronica-pt.com/index.php/component/option,com_remository/Itemid,34/func,startdown/id,16026/

Feb 14, 2011 | Behringer B3031A 2-Way Active Studio...

1 Answer

I have a Behringer Truth B2030A speaker. Today, when I switched it on, the power LED did not light up, and I am getting nothing from it.


A common problem is the power cord NOT being fully seated... push it in hard. Beyond that, take it in for repair.

Feb 01, 2011 | Behringer New! Behringer Truth B2030a...

1 Answer

I have a pair of Behringer B2031A Active Studio Monitor. All is functioning perfectly and automatic power is set to off. . After 5 minutes on, one monitor shut off unexpectly, which is not to be suppose...


This sounds like an internal failure, probably something overheating since it takes time to recover. Behringer OFTEN puts thermistors to sense temp on heatsinks that shut down in the event of overtemp.

If you are not electronically adept, best to take this in for repair. If you are able to work on electronics, try using circuit cooler to isolate the failure. First a good visual inspection followed by the finger test searching for hot components... Do use care where high voltages are involved, mainly in power supplies and input power leads, etc..

Nov 29, 2010 | Behringer B3031A 2-Way Active Studio...

1 Answer

Behringer Truth B2031A powered monitor speaker - radio interference in left speaker


A well know problem to the Behringer Truth B2031A speakers is radio interference and noise. I had the same problem with mine and found a solution on a forum!

If you open the speakers, you'll see a cable from the main board that runs to the 2 lights at the front (on/limit LED's). It functions as an antenna... Disconnect it and your speakers are silent, finally. (OK no leds, but I can live with that).

Oct 24, 2010 | Audio Players & Recorders

Not finding what you are looking for?
Audio Players & Recorders Logo

Related Topics:

4,546 people viewed this question

Ask a Question

Usually answered in minutes!

Top Audio Players & Recorders Experts

kakima

Level 3 Expert

102366 Answers

 Grubhead
Grubhead

Level 3 Expert

4852 Answers

The Knight
The Knight

Level 3 Expert

72620 Answers

Are you an Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...