Loud Hum From My Polk Audio PSW140 - diyAudio
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Old 12th January 2010, 10:17 PM   #1
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Join Date: May 2009
Location: Northern Virginia
Default Loud Hum From My Polk Audio PSW140

Hooking up my Polk Audio PSW140 subwoofer to my stereo this weekend I noticed that the SW would not power up. I pulled the amp plate and found a blown fuse, which I replaced and re-installed the amp plate. Upon plugging it in the SW began to make a loud hum.

I spoke with Tech Support at Polk Audio and they said it might be a regulator or output.

Any ideas what the problem might be or where to start troubleshooting?

Thanks in advance.
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Old 13th January 2010, 12:33 AM   #2
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Join Date: Aug 2003
Location: Santa Cruz, California
I would look at the power supply filter caps. Polk had a problem with underrated caps once upon a time, so they'd blow after a while. On the other hand, you might also want to look at the output transistors:

Bad amp - PSW140 - Club Polk
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Old 17th January 2010, 08:14 PM   #3
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I have found the problem, it looks like one of the transistors and two of the resistors got damaged. The transistor looks like a TIP29C, and the tan-bodied resistor looks to have a 10 kohm value and the green-bodied resistor value I cannot determine. When I MM each of the resistors, I get the following values:

tan-bodied 1.828 kohms
green-bodied 2.494 kohms

The two similar, looking, resistors in front of the TIP30C transistor have the following values:

tan-bodied 1 ohm
green-bodied 12 ohms

Not sure what I have going on here.

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