Question about Sony STR-DE505 Receiver

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Why does my Sony STde505 go into protect mode?

Without having any speakers attached, my Sony STR-de505 receiver goes into protect. Can it be fixed? Or just buy new? Any suggestions?

Posted by Anonymous on

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5 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 20 Answers

SOURCE: Blinking Protect Mode

You are right! There's a good chance you BLEW IT UP, so to speak! But there is hope... [Note: There are no fuses on this unit, inside or out. There IS, however, an internal overload protection system designed to prevent permanent damage. With no disrespect Sony, it is not a very ample system. That is, it simply doesn't do its job very well. However, there is a CHANCE a reputable service center can reset it, but don't get your hopes up.] But before you take it in for service, it is also a REMOTE possibility you will get lucky doing one of the following: FIRST, what happens when you DISCONNECT ALL OF THE SPEAKERS? Does it still go into Protect mode? (If it does, it's time for service.) If not, then you might simply have a bad speaker (rare); a shorted wire; or improper speaker impedence: The NEXT STEP, then, is to make certain ALL of your speakers have an IMPEDENCE of 8 OHMS. Virtually all speakers of even modest quality will include this specification on a label on the back of the speaker. You CANNOT run more than (2) TWO speakers with 4 OHMs impedence on ANY amplifier (technical discussion too long!) Finally, in switching your speakers around for the party, and then again afterwards, you may have crossed a wire; ran a staple through one; or have bare wires touching at one (or more) of the speakers. Check first for bare wires touching one another. This would put your Sony into Protect mode the instant you turn it on. If everything looks okay at the speakers, then reconnect them to the receiver, and test them ONE AT A TIME. For example, reconnect the left front speaker, test the system; THEN add the right front, test the system, and so on, ADDING one more speaker each time - FIRST MAKING SURE EACH OF THEM HAS AN IMPEDENCE OF AT LEAST 8 OHMS! IF there is a short (or bad speaker) this will help isolate it. Assuming the unit powers-up without speakers, then one of these simple fixes might prove worthwhile! GOOD LUCK!

Posted on Jul 18, 2007

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  • 11 Answers

SOURCE: stuck in protect mode

Speakers shorted out, blew a fuse. Replace the unit or (cross your fingers and) open up the box and find the blown fuse.

Posted on Dec 05, 2007

  • 1 Answer

SOURCE: Sony STR DB-930 Receiver jumping into protector mode

I went through the amp/receiver and used small star washers on all the grounding screws I could find including the one securing the transformer, cleaned dust off all circuit boards, checked output transistors and fuses, all OK.

Re Assembled unit and it worked OK.

I will buy a fan and fan it to avoid sourcing heatsinks for the previusly suggested IC's.

Thanks for the technical help, sure solved my problem.

Regards

Darryl.

Posted on Mar 13, 2008

ginko
  • 19396 Answers

SOURCE: stuck in protect mode

Protet mode is a special diagnostic mode that starts when a fault is detected.

When in protection mode the unit is prevented from starting by protection circuit, so to prevent further damage.

Check the speakers and speakers wiring, a contact in speaker wires, or faulty speakers can send the unit in protection.

Try unplugging power cable for one hour or so. then connect cable back and see if you get rid of protect state. Sometimes accumulation of electrostatic charges inside circuit capacitors can kick in protect mode. In that case unplugging the unit from main for some times can get rid of electrostatic charges, and reset circuits by draining power completely.
If that was the problem, you will not get Protect when plugging back power cable.

If you do all the above and still get Protect, then there is a real fault.

In that case the unit may be disassembled and tested to find the fault.

If that is the case I suggest contacting the manufacturer at the number listed on the owners manual, or asking a quote on repair to a local technician.

Posted on May 29, 2009

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1 Answer

Stuck in protect mode


There's nothing more you can do. It is likely a shorted output transistor that became damaged when either playing too loud for too long, connected to shorten speaker wires, etc. A repair shop or replacement will be you best options.

Sep 10, 2015 | Sony STR-DE597 Receiver

1 Answer

My Sony str de335 is in protection mode speakers are unhooked how do I get it out of protection mode?


if you disconnected everything and it still goes into protect, the most likely there is a damaged amp channel that will need to be repaired.

Feb 23, 2015 | Sony STR-DE335 Receiver

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Having problems with my SONY str-db798 amp. When i turn it on (without any speakers or even with speakers) it flashes "PROTECT" and shuts down. Any suggestions how to deal with it without getting...


Press and hold down the power button on the front panel until you hear a secondary "click" from inside the chassis. That takes about 15 seconds.

Then read my tutorial on how to keep your receiver out of protect mode.

Sep 03, 2011 | Sony STR-DB798 Receiver

1 Answer

When we turn on the receiver, after a few minutes the word PROTECT flashes & the sound goes off


Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and
operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by
the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient
ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan
(if equipped) is running as designed (some only operate on demand). Clean dust and debris
from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection
cycles in their lives so continuously resetting or cycling their power without addressing the
cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections
and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not
come up the problem is internal and should be left to an experienced and competent hands-on
tech.

Jul 10, 2011 | Sony STR-DE505 Receiver

1 Answer

Hai.i have a sony str-de505 amp. one day i put the volume high n on the unit.suddently the sound goes high n then no more produsesing a single sound.when i switch on the souround n on the uni,the sound...


You cooked it. Maybe you lucked out and just blew a speaker.

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

May 31, 2011 | Sony STR-DE505 Receiver

1 Answer

When iturn on my Sony STR-DE325 it goes into protect mode


Try disconnecting all of your speakers, and then turn on you unit. If you have a defective speaker, or a short in your wires, your unit will go into protect mode. If your unit seems ok with the speakers disconnected, then turn unit off, hook up one of the speaker leads and try it. This way you can isolate the problem.......

Good Luck,

Eric

Jul 09, 2009 | Sony STR-DE325 Receiver

1 Answer

Goes into protect mode..


you probly have speaker wires arching. unplug them and replug thm in making sure no bare wire is showing

May 17, 2009 | Sony STR-DG520 Receiver

1 Answer

You Just Responded to my STR-DG820 Issue..........


Its internal problem of receiver and as you said, its brand new so it would have warranty cover. Simply return it and get replacement. I have all tech info including schematics of this particular model and can guide you to resolve this problem but I receommend to askSony for warranty replacement.

Jan 02, 2009 | Sony STR-DG820 Receiver

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