Question about Polk Audio PSW202 Subwoofer

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Psw202 sub has loud hum then blows the fuse - Polk Audio PSW202 Subwoofer

Posted by Anonymous on

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 308 Answers

SOURCE: Polk Audio PSW202

The power supply or amplifier has a shorted component.

Posted on Mar 12, 2010

  • 1 Answer

SOURCE: PSW202 now has buzzing sound. Was slight, not it

Mine does the same, even at low volume/frequency. Let me know if you ever find out why.

Posted on Jan 18, 2011

  • 2 Answers

SOURCE: The 2w 250V fuse keeps

sent mine to Polk. Free fix on main board. Works great now.

Posted on Jan 19, 2011

Ironfist109
  • 3018 Answers

SOURCE: Loud hum when speaker is

  • A couple of things.
  • Trey plugging it in to a different outlet and see if that helps. You could be getting a ground loop.
  • If this did not helps then next get inside the box and check the wire connectors. Make sure none have come loose. Be real sure. Also if you are hooking any of the other speakers to the sub (rather than using the receiver) then make sure to remove them ALL so that the sub is stand alone. This will make sure that the amp/sub is at fault and not some other speakers that you may have connected to the back of the sub.
  • Make sure the low pass phase is set to about 120. Don't set it to high.
  • Make sure to check the RCA ports on the sub box as well. If one is shorting it will hum weather a receiver is hooked up or not.
  • Now all that I have listed is the easy checks. If None of the work then the problem will be a filter capacitor on the power supply board has gone bad. You have to remove each one out of the board and test it for polarity and replace as necessary. This is what I think it is already but I always advise checking the obvious before going to the circuit board. If you have not done much soldiering or circuitry work I may suggest you get a friend to help. Some of them big capacitors running on AC can hold a deadly charge if the bleeder resistors malfunction.
  • This is a fixable unit for sure though.


  • Good luck to you and thank you for using FixYa.

Regards, Tony

Posted on Jul 23, 2011

  • 2 Answers

SOURCE: Polk Audio PSW202 subwoofer.

Fuse probably went bad because either the large filer capacitors at the edge of the PCB went bad and or the final output IC mounted on the heatsink(15 pin) fried. Check the capacitors and all the semiconductor components on the board for burn marks or corrosion. You have to remove the heat sink clamp from in front of the output IC to adequately visualize its condition. In fact you might have to remove the large aluminum heatsink attached to the chassis to get a good view of the IC. If it or the heat sink clamp show signs of thermal burns you need to replace it. The IC is a TS TDA7294 mono audio amp available at Mouser Electronics. Replace the 35V 4700mF caps with 50V 4700mF caps. You will only have enough space on the top of the PCB for one of the larger caps. I mounted the other on the circuit side of the board. Note the polarity of the original caps and respect it in their replacements. The fuse is a 5 X 20 medium speed slow blow 250V 2.0A glass fuse.

Posted on Dec 02, 2011

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1 Answer

My sub is making a rattling sound. I dont know what it is, and I dont play my movies that loud. I also have the sub power only about 40%, I dont know whats wrong with it


First pick it up and shake it, to see if something is loose inside it!
Sometimes the speaker cone can become damaged. If you can get at it, gently press it so it moves up & down. Don't press it from the side, just apply force all over. It should just move without scraping. If it doesn't the cone is damaged.

Feb 06, 2010 | Polk Audio PSW202 Subwoofer

1 Answer

Fuse blows, replaced the two capacitors and it still blows fuses... sub is fine and not blown...what else could it be??


If your sub is made to be used in other countries check to make sure it hasn't been switched to a different voltage.

Dec 18, 2009 | Polk Audio PSW202 Subwoofer

1 Answer

PSW202 now has buzzing sound. Was slight, not it is loud. Saw the fuse solution. What about the 35amp capacitors?


Mine does the same, even at low volume/frequency. Let me know if you ever find out why.

Oct 28, 2009 | Polk Audio PSW202 Subwoofer

1 Answer

The sub doesnt turn on no more...? why?


check the internal fuse. near the power cord there is a round modual that you can unscrew. once unscrewed you will see a fuse in there. make sure it has not blown. if that is not it make sure the sub is switched to on and not auto. on auto setting it will turn itself off if no signal is detected.

Aug 05, 2009 | Polk Audio PSW202 Subwoofer

1 Answer

The power fuse blows as soon as the unit is plugged in


There is a problem with the amplifier within the sub. Many of these units never completely turn off. They are often set to automatically startup when a signal is detected. This may be the case here. The loud hum as a defect in the output amp section. At this point you probably have a blown amp section. The "protection" for this is to cause a dead short that will open up the fuse. This unit will require service. It is unlikely that any service info is availabel to the general public either.

The fix could be simple, but without seeing the unit, I can not state that for sure.

Keep us posted.
Dan

Feb 03, 2009 | Dual L8SW Subwoofer

1 Answer

Polk Audio PSW202


first you have to check any short circut , that may be inside of sub woofer unit .
find and sove any short circutry and then only replace the fuse with same rating.
and before you switch on it once again recheck any meterial shored with electronics pcb.

Nov 08, 2008 | Electronics - Others

1 Answer

Polk Audio PSW202


The power supply or amplifier has a shorted component.

Nov 08, 2008 | Polk Audio PSW250 Subwoofer

1 Answer

Makes a loud humming sound and blows fuse behind controll panel


Most likely a shorted capacitor is causing the fuse to blow. Easy and cheap to fix.
Check with www.martinmicrowave.com or call toll free 1-877-894-0035 for parts info

Sep 02, 2008 | Sharp R-1460 Microwave Oven

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