Question about Sony STR-DE485 Receiver

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Receiver turns off shortly after powered on & displays "PROTECT"

When I turn on my STR-DE485 receiver, it broadcasts whatever is on...then receiver is silent and window display reads "PROTECT". I've checked speaker wire attachments to speaker backs for possible source of short circuit, I wonder what other D. I. Y. efforts might be exercised before making it unplugged and apart and sent for shop remedy? or maybe it's not worth the cost of repair and needs to R. I. P. Sincere thanks for thought and advice ! Mark

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Normal short ciruit or over heat probs can be solved by DIY beyond that u have to take to a service centre. In ur case u've checked all possiblities of above listed, so its better to call the service personal

Posted on Jul 09, 2009

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Are any other devices sitting on top of this unit? if so it could be an overheat.

If you have pets make sure the wires are not chomped on this can cause a fault.

Also make sure you have nothing other than the factory default speakers hooked up to it.

here is what the users manual says
im going to sum it up for ya. if it says protect that means you have a short circuit please unplug the unit resolve the short circuit and plug back in....... here is the link To the users manual

once it is opened as a PDF document go to the search/ find area and type in "protect" and it will say the same thing.

somewhere you have a short your going to have to follow all the wiring again and look closely

Posted on Jun 01, 2009

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1 Answer

No sound protect mode

Protect on a sony usually means a short in the amp section. Would have to go in for repairs.

Jan 24, 2013 | Sony STR-DE485 Receiver

1 Answer

Receiver says "protect" and no saund

Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.

Overloads can be from excessive periods of high output 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 hands-on tech.

Feb 04, 2011 | Sony STR-DE485 Receiver

1 Answer

My sony str-de485 is displaying a "protect" on the screen it won't let me hear musice or cd's

Receiver say's "Protect" or turns on then off posted on Dec 13, 2009
MessageRate.ThreadID = 3632423; MessageRate.ProductID = 0; c81ea4d.jpg smarthome2
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The most common problem found on FixYa for Audio Video2_bing.gif Receiver's is:

My receiver say's "Protect" or turns on then off. What's wrong? Seven times out of ten it is a shorted speaker or speaker wire2_bing.gif. To determine your exact problem, the first step is to disconnect all speaker wires "at your receiver" Next: Turn the receiver back on. If your receiver still says "protect" or turns off, it needs to be serviced. If your receiver stays on; reconnect your speakers2_bing.gif one at a time and power back up after each speaker. You may find that after reconnecting all speaker wires it works! Most commonly the small braids of wire from the + to the - have touched and have caused the problem. In some instances, you noticed the problem only when turning the volume up. either way, make sure the exposed wires to your receiver are no longer than 1/2" long and are completely under the screw down terminal or slide in. When you've found the wire or speaker with the problem, your receiver will go back into "protect" At this point, disconnect the wire from the speaker at the speaker that may be causing the problem then test again.* Note* Make sure speaker wires do Not touch each other as this Will cause a short! If you turn the receiver back on and it stays on, you now know the problem is in your speaker itself. To test your speaker, you will need a multimeter. Set it to ohms resistance and touch the speaker terminals, if there is a short internally the meter will read "1......" If it's an analog meter, it will peg to the right. There's your problem. Now, within any speaker there are quite a few possibilities as to what could be causing the problem. Most common is a blown coil and the speaker needs to be replaced. Some speakers have internal crossovers (usually floor standing speakers2_bing.gif) and may have a shorted or burnt board (usually very visible brown burn marks on the board) and can possibly be repaired if your handy with a soldering iron. Now, if you disconnect the speaker wire at the speaker and it still says "protect" Check your wire for the obvious cut or nail thru the wire if possible. If your system has wiring that runs behind walls, you may need to use your meter again. Disconnect the wire at both ends, keep the ends separated, put your meter on ohms resistance and touch probes to the + and - wires at one side. If the meter pegs to the right or reads "1...." the wire is shorted and needs to be replaced or repaired at the short. Hope this helps.

Feb 26, 2010 | Sony STR-DE485 Receiver

1 Answer

I keep getting protect on the display even after unpluging all speaker and inputs

there is most likely a problem with the unit that keeps tripping the protection circuit there could be a short somwhere. it would have to be looked at by somebody, because without looking at it, it would be really hard to determine the cause of it.

Dec 12, 2009 | Sony STR-DE485 Receiver

1 Answer

Is in protect mode

I don't have and I'm not familiar with this particular receiver model, but common sense tells me that your receiver is trying to alert you to the fact that you may have shorted speaker wires, and it has gone into protect mode, to prevent itself from blowing up.
Please check your wires at the back, or best yet, if your receiver has a test mode on the remote control, use it. It tests your speaker connections for shorts, for wrong polarity, etc. If this receiver has surround sound, and all speakers are connected, it goes round and round creating some white noise from all speakers as it goes, until you press the Test button again.
Should one or more be connected improperly, or the wires be shorted, it will display a message telling you so.
Good luck!

Aug 21, 2009 | Sony STR-DE485 Receiver

2 Answers


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

2 Answers


check the speaker's connections, I got them message when a speaker wire was unplugged and plugged back in while the unit was powered on

Oct 02, 2007 | Sony STR-DE675 Receiver

1 Answer

Sony STR DE485 (Audio Video Reciever)

Your problem must be caused by the right channel (rear, front whatever..)side feeding resistor on the power supply.

May 05, 2007 | Sony STR-DE485 Receiver

2 Answers

Protection mode keeps kicking in

This happens less often in "normal surround" mode

Apr 01, 2007 | Sony STR-DE485 Receiver

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