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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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Posted on Jan 02, 2017

  • 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.

Posted on Apr 08, 2008

  • 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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