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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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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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The main fuse is open, or the power transformer has a open primary. Remove top and unplug system, if you have a digital meter set it to ohms and check the fuses, next put meter test leads on the too wires going into the transformer, if no reading it is open.

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If you have no power, it will be a open fuse to an open transformer in the primary. If the fuse is open it may indicate bad audio outputs. This is no small job, but you might get lucky with a fuse replacement.

Mar 18, 2012 | Harman Kardon Audio & Video Receivers

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Seems to be some sort of power problem since the READY light is no longer on, and therefore the remote control cannot turn the receiver on, nor can pressing the power on button turn it on.

If there is no standby light. Open the top cover and check the fuse on the primary power side. MAKE SURE THE POWER CORD IS UNPLUGGED.There are two transformers in this model. A small one for standby and a large one for the main section.A relay clicks when you touch the power button and switches on the large transformer and the display comes on. If there is any problem in the output stage the the relay will click and the system will go into standby again.

Mar 10, 2011 | Denon AVR-75

1 Answer

Stand by /on led lights up but that is it. Click sound when ON is pushed. It is like it won't power up. Took off cover two fuses inside appear fine.

Check the main power transformer.

ohm out the primary side should be about 2 ohms. and check for 120v ac when you power it on.

If 120v is present on the primary side check for ac on the secondary. if none you need to replace the tranformer.

If it doesn't have 120v ac on the primary there is an open fuse or bad solder connection.

If you find an open fuse check for a shorted output transistor pair.

good luck

Nov 09, 2009 | Denon AVR-1803 Receiver

1 Answer

Receiver does not power on. standby not on either. receiver is the onkyo tx-sr501

The standby light should be on. If it is not, then check the main fuse. WIth the unit unplugged, remmove hte top cover and check the fuse by the line cord. If that is ok, then you will need to check the primary winding on the standby transformer. That transformer has a thermal fuse internally located and that sometimes gets blown due to a power surge. If you do not have the equipment to test this, get a detailed estimate from a local servicer. The standby transformer usually costs arounf $25 or so.


Apr 26, 2009 | Onkyo TX-SR501 Receiver

1 Answer

My sx-315 pioneer receiver overheated and shut down.

Probably the thermal fuse in the main power transformer. Check for ac on both the primary and secondary of the transformer. If you have 120v ac on the primary when the standby light is off and nothing on the secondary you need a new transformer.

Feb 08, 2009 | Pioneer SX-315

1 Answer

Power surges

Does it attempt to startup at all? Do you get any lights or any indication that the unit is trying to start? If not, there should be a small transformer inside that is the standby transformer. It generates the 5V standby voltage. I have seen these go open in the primary since there is a fuse built into the transformer. You may need to replace this transformer. You should be able to get to the primary winding. With the unit unplugged, measure across the primary side with an ohmmeter. You should read a low value. If it reads infinity, the primary is open and you need to replace the transformer.


Aug 07, 2008 | JVC RX-517V Receiver

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