Question about Sony HT-5500D System

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Protect light flashes

The protect light is on and I hacve disconnnected all speakers and the power overnight. Still have the light on. What should I look for next?

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Make sure you have turned the volume down to minimum.

Posted on Mar 07, 2008

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1 Answer

Standby indicator flashes


When the "Protection" indicator comes up the display panel of my receiver or the On/Standby LED is flashing, does that mean my receiver needs to be repaired?
The "Protection" light comes on when the receiver's current sensing and thermal monitors detect some unusual operating condition that, if left unchecked, might damage the amplifier. This can happen if there's a dead short in a speaker wire or if you're using very low impedance loudspeakers at high volume for an extended length of time. On older model AVRs you may see the word "Protect" on the receiver's display. More current models will indicate a flashing red light on the Standby LED when a Protection circuit trips
n thermal cases, the circuitry will automatically reset after a few minutes of cool down and the Protection indicator will go out and normal operation will resume. If the protection light came on due to a speaker wire short, low impedance condition or a bad speaker, the receiver's power will need to be turned off to reset it. Before turning the power back on, all speaker wire connections should be checked for their integrity at the receiver side and at the speaker side. If the protection light goes on immediately after you turn on the receiver, disconnect the speaker wires at the receiver side and retest. If the receiver's protection light goes off, then there would still seem to be a problem with one channel's speaker wires or speakers. Connecting them one by one and retesting should allow you to find the problem speaker or connection.
If after checking all your connections, the Protection indicator stays lit, you may need to "initialize the microprocessor (see the FAQ on that topic) or take your receiver to an authorized repair center for a diagnostic. The "Initialization of the Microprocessor" or "reset" procedure can be found in your owner's manual on current model AVR product. Please note, this will erase all setup configurations in the system and require the system to be setup again. You may want to mark down the settings before resetting your receiver to aid in the setup process. If you had an installer setup your system, you can contact them for assistance and any associated costs that may apply to setup the receiver again would be the responsibility of the owner.

Jul 17, 2016 | Sony DAV-FR1 System

1 Answer

No sound and light on input selector knob is Flashing. Light only flashes when speaker switch has been turned to A, B or A&B.


This can happen if there's a dead short in a speaker wire or if you're using very low impedance loudspeakers at high volume for an extended length of time. If the protection light came on due to a speaker wire short, low impedance condition or a bad speaker, the receiver's power will need to be turned off to reset it. Before turning the power back on, all speaker wire connections should be checked for their integrity at the receiver side and at the speaker side. If the protection light goes on immediately after you turn on the receiver, disconnect the speaker wires at the receiver side and retest. If the receiver's protection light goes off, then there would still seem to be a problem with one channel's speaker wires or speakers. Connecting them one by one and retesting should allow you to find the problem speaker or connection.

Jan 14, 2015 | Audio Players & Recorders

1 Answer

I have a red protection light flashing whenever i try to work my amp and i was just wondering what the solution is or how to reset it, thanks


Normally this means that the power supply or the load is incorrect.
Have you very low impedance speakers ?
Have you tried disconnecting speakers from amp and powering it on.
If it does and you do not get any protection light you need to investigate your speakers.


Feb 12, 2011 | Cambridge Audio Azur 540A Amplifier

1 Answer

It keeps shutting of and the power light just flashes if there is too much bass? what do i do? the volume is low to begin with


Hello, the protect circuit is likely detecting a damaged speaker or speaker wire.Check the unit with one speaker at a time connected, or if you have an ohmmeter measure each speaker they should read approximately 8 ohms.When you connect a speaker thats bad the unit is designed to shut down and flash protect.

Jan 14, 2011 | Sony MHC-GX450 CD Shelf System

2 Answers

My phoenix gold x200.4 amp turns on but the protect light keep on flashing


  • What does it mean when the LEDs flash on my amplifier?
    With most recently produced Phoenix Gold amplifiers, a flashing/blinking LED is an indication that the unit is in protect mode, usually due to an overcurrent condition caused by an internal short, external short (speakers), or low impedance. Overheating will also cause the amplifier to shut down temporarily.

    If amplifier remains in protect mode, power down the amplifier, disconnect the speakers, and power up again. If LEDs continue to flash, there is probably an internal problem with the amplifier that will require service attention to fix.
  • Sep 23, 2010 | Phoenix Gold ZX600ti Car Audio Amplifier

    1 Answer

    My integra dtm 5.3 flashes protect when i turn it on and then shutdown and the standby light start flashing. cant seem to find an answer.


    disconnect all speakers. do this with the power cord unplugged from wall. then re-try without speakers. if still in protect --shorted channel-which is repair/parts will be needed.

    Feb 27, 2010 | Audio Players & Recorders

    1 Answer

    Protection light keeps flashing on and off


    try hooking up only the power ground and remote see what happens if protection light is on then u have a problem with amp if it goes off then hook up rca if still off then hook up speaker wire if it turns on then u have a prob with speakers

    Feb 02, 2010 | Kicker ZX10001 Car Audio Amplifier

    1 Answer

    Pilot light on unit is flashing rapidly, no apparent output


    disconnnect speaker wires , if amps light is steady then its one of the speakers or wireing . if not check ground ,or use a meter to check rca barrel to amp for ground set meter @ rx1 ,see amps ground is solid and clean

    Nov 07, 2009 | Pioneer GM-X334 Car Audio Amplifier

    1 Answer

    Protection light flashes on and i get nothing


    Hello shwoop22,

    It sounds like power is shorting out or the amp is defective. With the fuse removed, use a multimeter set to ohms and check between the power terminal to ground.

    The protection light will normally come on if the amp overheats (for example when running with too low impedance), or if the speakers are shorted.

    Hope this helps.

    May 04, 2009 | US Acoustics USX-2100 Car Audio Amplifier

    1 Answer

    Problem with azur 640a amp


    protection mode activated to protect your amp from a problem.
    please disconnect all your speaker from the amp and check if it is fine start to connect your speaker one by one until you find the bad one which make the problem-change its cable first and then speaker itself.if the problem still you will have a problem in amp.

    Jul 08, 2008 | Cambridge Audio Azur 640A Amplifier

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