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Sony Model No STR-DE475 blinks "PROTECT" even with no speakers

There is no sound from stereo speakers and it was blinking "Protect" manual says it is caused by a short. I disconnected all other units and the speakers and TV and it still blinks PROTECT. Is this a throw away that costs more to repair than to buy a new one. Is it likely the silicon grease washers on the output transistors? I understand that is a lot of labor and not worth fixing. What is your thoughts?

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With all speaker wires disconnected and still showing the protect message, the short is internal. This is a rather common failure for these units. The output transistors are shorted themselves. These are relatively simple to replace and run about $15 each. Any service shop that repairs audio can fix this easily. Usually, once the outputs are replaced, you can get many additional years of service from the unit. Yes, it is worth it (in my opinion).

Dan

Posted on Dec 02, 2008

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2 Answers

Why is it blinking protect?


Try disconnecting all the speakers and turn it on if it still goes into protect you will need to get it serviced but if it turns on then you have a problem with the speaker or wire run (check for shorts )

Roger

Jan 07, 2016 | Sony Str-d565 Digital Audio Video Control...

1 Answer

Protect flashes


Assuming this question is also about the STR-DE695, there's a short circuit according to page 56 of this manual: http://www.fixya.com/support/p224379-sony_str_de695_6_1_channels_receiver/manual-16200

Nov 25, 2013 | Car Audio & Video

1 Answer

Sony str de 475 ?? is appear 'protect' on screenboard and can not listen anything


The message appears usually when the wiring is wrong (short circuit) or the speakers are defective or their impedance is too small for the amplifier's output (for instance 4 ohms speaker connected to an 16 ohms output). First, check your connections.

May 15, 2011 | Sony STR-DE475 Receiver

1 Answer

Protect problem


you either have two speaker wires touching or u have a positive speaker wire where a negative should go.

Feb 11, 2011 | Sony STR-DE475 Receiver

1 Answer

Sony STR-DE475 receiver ''protect'' problem


The relay or relays that click disconnect the receiver from the speaker terminals so that no dc voltage can burn out the speakers. More than likely the power output transistor(s) are faulty. Look at the relay(s), determine the input and output connections. The inputs come from the output power transistor and emitter resistors area, the output of the relay(s) connect to the speaker terminals. Check for dc voltage on the input contacts in the range of 30-60 volts possibly. If dc voltage is found there then you have bad outputs, caps or emitter resistors. A word of caution -troubleshooting at this level requires advance knowlege of electronics, do not attempt this with out onsite help from a experience tech.

Jul 01, 2010 | Audio Players & Recorders

1 Answer

PROTECT MESSAGE


It senses an error or problem and shuts down. Try disconnecting all the cables and wires attached to it. Try it again. If it still shows protect message, it is an internal fault and requires a repair shop. If it clears up, then the problem may be a shorted speaker wire. Correct the short when reconnecting the speakers.

Mar 08, 2010 | Sony STR-DE545 Receiver

1 Answer

Sound went off,says 'protect'


need replaced power output
transistor amplifier short

Nov 15, 2009 | Sony STR-DE475 Receiver

1 Answer

How do i disable the protect mode?


Ensure your speaker ratings (4 ohm, 8 ohm, etc) are sufficient with the output of your unit. The protect mode sense a currently level on the output amps that is nearing the failure rating. Just make sure your have properly rated speakers.


May 03, 2009 | Sony STR-DE475 Receiver

2 Answers

PROTECT DISPLAYED ON RECEIVER


This generally means you've got a short somewhere, and the received is trying to protect itself.

My suggestion is to disconnect all of your speakers at both ends, and reconnect them.

Most times this happens because a speaker wire is lose, and the positive and negative connections are touching each other, causing it to short out.

Mar 24, 2009 | Sony STR-DE485 Receiver

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