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No Power to Polk PSW650 Sub. Fuse okay. Main transformer primary open, looking for a replacement transformer. # on top 54-0013-0000

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4 Suggested Answers

  • 4 Answers

SOURCE: Yamaha RX-V995 no power no audio [dead]

sounds like a short in the cpu of the unit

Posted on Mar 07, 2008


  • 4234 Answers

SOURCE: Have a nearly 30-year old

Look for shorted output transistors or possibly shorted rectifier diodes. An immediate fuse blowing up usually means that the power supply is the problem. Keep us posted.
Dan

Posted on Apr 08, 2008

tech240
  • 169 Answers

SOURCE: the power transformer thermal fuse

Very poor cooling could cause this to happen althiough it is unlikely unless the transformer was really cheap and not designed for 100% duty. Severe overdriving combined with poor cooling could do it.

Most likely is .....
Internal short in the winding or a short circuit rectifier on the low side, either way the only way to correctly check the fault is with a variac and some test kit.

Hope this helps
Thanks for using FixYa

Posted on Aug 17, 2010

  • 55 Answers

SOURCE: Amplifier is dead. Relay in

it is in auto protect mode, something wrong with your transistor/ic

Posted on Sep 22, 2010

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1 Answer

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Is this a Polk PSW 125? I'd contact Polk customer service.
Here is the manual http://www.polkaudio.com/Media/POLK/Product%20Manuals/PSW110_125_MN.pdf
There is some discussion here http://forum.polkaudio.com/discussion/77264/psw125-blown-fuse
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The main fuse has blown, or the power transformer has a open primary, one or too audio outputs semiconductors have shorted. To narrow it down the top needs to be removed and unplugged, set digital meter to ohms and check fuses, next! the too wires going into the transformer should have a low reading, but if it reads infinity or open the primary side of the transformer is open.

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1 Answer

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Isolate and look for possible shorted components.

Isolate the main power transformer from the board, and see if the

fuse still blow.

If it doesnt , then the rectifier and capacitors to the regulators.

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1 Answer

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1 Answer

Microven doesn't work.


same problem here.
I just unmounted it and checked.
Main things you'd better check (if able, otherwise contact assistance..) :
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- Unmount, open the top (5 screws)
- microven fuse (open the top, standing in front look right top corner, there's a small circuit with wires and a black plastic case with a 250V 8A fuse in it): check it's ok
- microven transformer: it's the big one on the rear top, you need to check primary and secondary wires for short circuit (that's why the fuse blows up in case)
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Hope this helps

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1 Answer

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Could be the power supply but the transformer may
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1 Answer

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Have 1 of 2 choices, the main fuse or the control board for the front switches and clock. primary of the small power transformer has opened. Unplug the unit and take case off and measure the fuse with an ohm meter. if u read 1 ohm or less then fuse is good. then measure across the main power plug tips. If read open then the power transformer is bad. Need to replace the board as not sure if transformer is available.

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2 Answers

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Hi, Just call the parts line at Polk Audio. They should have the fuse. You can also ask for technical if you're not sure of the problem. Here's the number for Polk: 800-377-7655 Good luck to you.

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