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Amp cycles on and off

My 530a amp will turn it self on and off, while doing this it sends a thud sound over the speakers. The power light goes on and off with the amp but the protect light never comes on. It has good power, ground and remote checked with a amp meter. Both fuses are also good. It must be an internal problem. What do you think, how easy to fix myself being electrically inclined.

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Hello it sounds like the amp is going in & out of protection normally the protect light will pulse at the same time but is not always the case if you can get hold of a voltmeter set it to the 20v range & check to see if there is 12v present between the RCA (Phono socket) input & shield, if so then the switch mode power supply transformer is faulty. It could also be a number of problems elsewhere as well so really needs to be inspected by an experienced engineer.

Posted on Nov 14, 2009

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1 Answer

42inch bush tv has just turned its self of no buttons were pressed and the lights still on


the sound is an indication of a short in the set--have a shop take a look as this likely is not a do it yourself repair.

Apr 16, 2012 | Televison & Video

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

After turning on, even at low listening levels power indicator light goes from green to red and sub shuts down after about 10mins.


Perhaps its amp is overheating.

Generally speaking, an amp protects 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.

Mar 14, 2011 | Cerwin Vega CLSC-12S Subwoofer

1 Answer

Receiver keep shutting off,power light goes off,tried rebooting but after about 20 seconds the power light goes out again


Try resolving the reason it's self-protecting.

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 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.

Feb 27, 2011 | Directv Audio Players & Recorders

1 Answer

PA9336. The protection LED remains ON. If the power switch is turned ON & OFF rapidly, the protection LED goes OFF & the amplifier functions normally. Please advise. Thanks. A.A.Mulla.


I wouldn't try repeated rapid power cycles if I were you.


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 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.

Feb 22, 2011 | Audio Players & Recorders

1 Answer

I have an Infinity 530a 5 channel amp. new


May be the problem is on the sound you are using is not a 5 channel coded sound or check in the menu´s of the amp if the rear channel´s have sufficient db output, check the connections, check if you amp. is not working only as simple stereo (menus also)

Hope this helps

Jun 24, 2009 | Infinity Car Audio & Video

1 Answer

Sub power comes on consistently for about a second and thuds


u might have bridged the amp below is ohm load, if that the case run the speakers in series instead of parraell !

Dec 25, 2008 | Kenwood KAC-9152D Car Audio Amplifier

1 Answer

No Sound out of my speakers


The last Kenwood that I had witnessed with a flashing power light was defective. It also caused the subwoofers to move slowly back and forth. More than likely, you have an internal issue with the amp. Call Kenwood, and see how much they would charge to have you send the amp in for repair. Or pick up a new amp.

May 11, 2008 | Kenwood KAC-959 Car Audio Amplifier

1 Answer

Amp not working correctly goes into protection


Disconnect the speaker wires from the amplifier and see if it still goes into protection mode. If it still goes into protect with the speakers disconnected, there's a problem with the amp; if not, you may have a blown speaker or a shorted speaker wire.

Feb 22, 2007 | Legacy LA2098 Car Audio Amplifier

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