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Can my powered subwoofer be fixed?

The input of my subwoofer is broken. It was fixed by a friend and he screwed up wiring the circuit board. Do you know how much this will cost? I have a pre-out subwoofer on my receiver and can't use my sub due to broken input. Please help. Thank you.

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  • 960 Answers

Possibly, It took a while but I had a pair of 25 year old JBL Subs repaired after many said they cant be fixed. Have a look on line or in the phone book for your nearest amplifier / speakers / musicians electronics repair shop.

Posted on Apr 09, 2015

Testimonial: "Hi Steve! Thank you so much for your help. Its the reason why I didn't trash my powered sub due to age and performance. Again, thank you for your expertise. Best regards, Rosa"


6 Suggested Answers

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

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).
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Posted on Jan 02, 2017

  • 14 Answers

SOURCE: Onkyo Subwoofer Pre Out Problem

May not necessarily be the out put, discontect the sub from the receiver and see if it still makes a hum, Making sure that you turn auto on, off on the sub woffer.
If it still makes a hum, then you have a earthing problem, you can get a earth filter put on your internal wiring in your home, or you can remove the earth pin on your sub woffer

Posted on Dec 13, 2007

  • 1183 Answers

SOURCE: broken connector in subwoofer connection on receiver

As per the user manual , the receiver has only one sub-woofer connector. The other alternative is to use the digital audio output for the speakers . That would mean either you have to change the speakers or get a conversion box that would connect your analog speakers to the digital output.
The other thing that can be done is to replace the sub-woofer connector. The same can be done by a radio repair guy or you can take it an authorised pioneer repair centre.



Posted on Jul 27, 2008

  • 17 Answers

SOURCE: No sound from Sub Pre-out on Onkyo TX-SR606

Also, it could possibly the preout terminal itself that is not working. One way to prove that is by transferring the subwoofer cable from the preout and temporarily transfer it to the tape out section. If it ouputs sound from there, then that means the speaker and the cables are working fine and it's just the preout terminal itself that is not picking up anything. ^_^

Posted on Dec 16, 2008

  • 14 Answers

SOURCE: Can't connect subwoofer to onkyo av receiver

you would need a y jack to connect those to the receiver

Posted on Mar 05, 2009

  • 1 Answer

SOURCE: No Soound on Subwoofer from Yamaha RX-V363

I have the same setup. Are you going out of the subwoofer output of the reciever? (it's purple.) then into the LFE jack of the subwoofer (also purple.) That's the only connection you need besides power. If you have those right, try using your cable for something else to make sure the cable is good. Is the indicator of the subwoofer green? Mine comes on with the reciever. Good luck!

Posted on Apr 14, 2009

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Infinity TSS-450 subwoofer making a clicking noise

Just apply the excellent solution of "dskum" that I am reproducing here:


I had the same sub and I started hunting down the problem by disabling \'sectional\' parts of the circuit to find out whats causing the problem. The problem was narrowed down to the small \'limiter\' circuit which is soldered vertically on the Pre-Amp. (The wire from power amp connects to it)

As far me, the limiter circuit doesn\'t add much value, if you are careful enough not to push the subwoofer to its peak limits. There is a 7 wire bus which connects the Pre-Amp (top board) to the power amplifier (bottom board). In that 6 wires are just direct connection from pre-to- power amp board. The pre-amp output goes through the limiter. (1st black wire).

To remove the limiter from circuit just physically remove the limiter board by de-soldering the 7 pins through which its connected to pre-amp. Also you may\'ve to clean up the glue around to easily remove it. Disconnect the 7 wire connector from the limiter and solder it directly to the pre-amp board. (Only 6 black wires need to be connected.) Check the picture. Also as part of experiment I replaced the power filter capacitors with slightly bigger capacity. (But its not necessary - the glue on the old capacitors made it look like it was bulged - but its not).

The white wire (limiter feedback) is not necessary and that can be disconnected or cut off for good. All the popup/crackling/thumping it was making is gone and the sub is working great again. (Yes it was doing so even without any inputs).

While de-soldering make sure don\'t apply too much heat. The boards are pretty weak and you might easily damage the solder pads.


Whil Also don\'t use any kind of diode or mess with it the limiter circuit. Just removing the limiter circuit makes it good. If you use diode to directly connect the pre-amp line to power line as suggested earlier you might be damaging it more than its currently since you are almost connecting to the 42 v rails to it. Also if you google you would come across the service manual if you are interested in the circuit diagram.

Jan 24, 2013 | Infinity Audio Players & Recorders

2 Answers

Subwoofer makes loud hum noise

4 possibilities:
1) ground loop or open connection on input.
2) close proximity to a CFL, or other flourescent fixture.
3) bad filter caps in the sub.
4) bad coax to the sub.

in any event, check wire routing. You can also track down the noise sources by using a portable AM radio tuned off station. it will pick all manner of RF noise around the house. Light dimmers are notorius noise makers.

Dec 20, 2011 | Audio Players & Recorders

2 Answers

Dyson dc 15 brush roll not spinning. motor is good, upper switch is good.

Open the right side of the vacuum with a hex head screw driver. There are 4 screws. Inside you will find a circuit board.
1. Make sure the varistor (S20K150) is not blown, these models seem to have an issue with this. It is a flat blue "quarter" looking component near the top edge of the circuit board.
2. At the bottom of the circuit board are two white wires connected via push on connectors. Remove these from the circuit board by sliding them away from the circuit board. Power on the vacuum and engage the drive button. If the lower motor still does not engage check step 3.
3. A blue and yellow wire runs off the bottom end of the circuit board. These are the wires powering the lower motor. Check continuity with a multimeter and make sure they are not broken. I have seen where these wires will break as they run through the housing of the vacuum. If they are broken, replace them with any wire of the same gauge.

Dec 15, 2010 | Dyson DC15 Animal Bagless Upright Cyclonic...

2 Answers

Red light and thumping sound, same as earlier report on a infinity tss 450

If your talking about the thump thump sound thru the sub when in standby mode, here's a fix if your good with a small soldering iron. Remove the amp from the sub. Locate U301 on the limit curcuit. (the small circuit card standing up right) Replace U301 with a TL074IN ( part #248-0012) .35cents +S/H also remove R263 from the preamp board,add a new 1N4148 diode(#935-0242) .05 cents to the pre amp board. Connect the Anode of the new diode to the Anode of D101 and the Cathode of the new diode to the Cathode of D108. Replace amp and test. Thump thump should be gone.

Oct 30, 2010 | Infinity TSS-450 System

1 Answer

I have a YST-SW150 speaker that turns it self off after 7 minutes , turn it back on and it'll go again for 7 minutes, (sounds good those 7 min) music sensor auto on/off is off

I just fixed one of these with the same symptom.
In between the power supply board and the amplifier board are a number of rather fine interconnect wires. One of these is the shutdown/startup control line for the auto on/off function.
In my case the wire had been pinched where they are cable tied together. Causeing the power supply to think there was no music input and should shut down.
rejoing the broken wire rectified the problem.
In my case more than one wire had been damaged.
the shut down line is labled SO on the amplifier board connector.

Aug 10, 2010 | Yamaha YST-SW150 Speaker

1 Answer

ACS295 speaker cable to subwoofer, one of the pins of the connector is broken, how can I fix it or get a new connector?

if connector is broken, you need to buy a new connector, but it takes a little handwork and some tools a screw driver some electric iron and solder.

u need to open subwoofer case and check for the connector is soldered in a board is 2 jack 3,5mm female connector and one red mini-DIN connector. replace the connector take a attention on soldering the connector, dont damage the board wires and pins, if the iron above 300ºC.

take a special attention on electrostatic discharge, normaly burns sensitive boards.

Jan 30, 2010 | Altec Lansing ACS 295 Computer Speakers

1 Answer

No sound from creative t3030 2.1 speakers

the circuit board and amplifacation supply inside the sub are blow or shorted out.thus preventing any sound. the head phone jack works only because it is a bypass feature supported by the actual computer not the surround sound unit

Jul 23, 2009 | GE Ultrasonic 2.1 Subwoofer Computer...

1 Answer

Subwoofer blows the internal fuse when receiver is turned on

possible solution - this can be caused by a fault in the receiver unit. the sub has a triac 'high side switch' circuit that can cause the fuse to blow if it doesn't get a good switching signal e.g. if the receiver power supply is not running at the full voltage. check the plug pack wire for damage, check the 12v input area on the receiver board for dry joints, particularly the power input socket. hope this helps.-pj

Dec 11, 2008 | Bose Acoustimass 16 Speaker

6 Answers

KLH ASW10-120B subwoofer

I realize that this is an old problem, but folks are still finding it on searches, so here goes.

Here are the two pages of schematics from KLH. I wrote to their tech department and explicitly asked for permission to share them here.

Here's the lower board, which has the power supply:
KLH ASW 10-120 subwoofer schematic - lower board

Here's the upper board:

KLH ASW 10-120 subwoofer schematic - upper board

Jan 25, 2008 | KLH ASW10-120 Subwoofer

1 Answer

Regarding Sony SA-WM250 Subwoofer

There is probably a bad solder joint or loose wire inside of the sub box. If you can, unplug the sub, take the screws out and remove the back to inspect the circuit board. A clean solder joint is pointed and shiny, with the solder evenly distributed in the hole. Also check to see if any plugs are loose. Plug in the audio input and then the power, but be very carefull not to touch anything inside the box while the cord is plugged in!! Play some bass at moderate volume so there is pretty constant sound. Now, take a screwdriver with an insulated handle and gently tap around on the connectors and circuit board. Tap a little harder if nothing happens, also tap in different areas to try to force the sound to cut out. You can try to locate where the bad connection may be by tapping lightly and zeroing in on the location. When and if you find the problem, you will need to solder the connection with a soldering iron. If you don't have a friend to help, try a local electronics store. Good luck!

Jul 12, 2007 | Sony SA-WM250 Subwoofer

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