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My Pioneer M90 power amp started making very loud thumping noises when it was switched on, tried all inputs with was the same result. Failure of which component could caquse that?

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Posted on Aug 03, 2008

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My pioneer vsx 921 switched off while playing loud. ADv MCACC is flashing and it is not powering on? What could be the problem?


Your unit is locked in protection mode. Hold the advanced surround button and the power button to turn it back on. If it shutdown right away, then you shorted out the amp and need to take it in for repair.

Dec 28, 2012 | Pioneer Vsx 921 K Av Receiver Black

1 Answer

Pioneer VSX-1015TX 7.1 Receiver AMP ERROR I just recently started getting this AMP ERROR message when I try to change input sources, it does not matter which source I click on, for example, whenever I...


I would recommend checking your speakers polarity ( + on the + - on the - ). Also check to make sure the wires are not touching each other where they connect to the speaker or amp. Also check your input connections if you are not using HDMI or Optical. Worst case is you have to send it in to get serviced. Hope this helps

Mar 15, 2011 | Pioneer VSX-1015TXK Receiver

1 Answer

Hi, some days ago my little daughter messed up with all possible buttons on the front of the receiver and the remote also, so in result I have the follwoing issues: - when I try to set the speakers with...


erm.... this is a strange one, the popping very loud sounds is the amplifiers turning on and lookinf for the input, so its possible the input method has been altered from original settings i would try fixing this first, im sorry i cant be any more help or any help at all to be honest lol, worst case scenario put your daughter in front of it and let her play away again. good luck : )

Jan 31, 2011 | Denon AVR-1508 Receiver

1 Answer

My both A and B left speakers are noising (When something is playing, the're making some white noise) . What should I do ??


What source is selected when this happens? Badly-tuned FM radio or undecoded DTS from an external source could make loud white noise?

Just the left? Suspect the source if it's external. Swap left and right inputs to see if it follows.
Multiple sources? The amp is causing it.

There is the slighest chance that a common control may have developed a high-resistance or 'dead' spot and is causing your symptom. Turn the POWER OFF and operate every control throughout its range a number of times, especially rarely-used ones like Tape Monitors and the Mute control.

Maked sure your speaker wires are physically isolated or at right angles to power cords, devices with motors, TV

Jan 19, 2011 | Pioneer VSX-453 Receiver

1 Answer

While listening to DVD audio through the Amp, the audio muted with no selection on the remote. The mute light was not lit. Turned the amp off and then back on, the audio returned for 30 seconds, and then...


If I understand you correctly, you're listening to a DVD-A (high resolution audio) through the 5.1 analog inputs.

OTOH, if you're listening to a DTS soundtrack via a digital connection it will produce loud hash noise if played via analog means. You may have digital audio, stereo analog and 5.1 audio cables running from your DVD player to the receiver (I do). Look to see if the digital feed is dropping out. Three should be a light in the receiver to indicate 'digital'. The unit couldc be defaulting to analog stereo in the absence of a good digital bitstream.

Then you might want to look at the DVD player to make sure it isn't malfunctioning.

In this world of ripped portable music and earbuds it's nice to hear someone else appreciates high fidelity on DVD-A. Too bad the retail market for them and SACD died. I found dozens of them on eBay so at least I have a lot to listen to.

Aug 08, 2010 | Kenwood KRF-X9060D Receiver

1 Answer

I have bad static from my Pioneer vsx 49 Elite


sorry no easy solution as it sounds like the output transistors blew out or the emmitter resistors. you will need a service manual and an multimeter to measure the resistors on or around the audio output transistors they are a low value resistor usually around 1 to 2 watts in size. Do not replace any bad , burnt or discolloered resistors around the audio output transistors as if tou do you might just cause more damage to the output transistorsor audio output stage including the audio driver stage of the amp!!!!!!
Larry Dillon

Aug 27, 2009 | Audio & Video Receivers

1 Answer

I cannot work out how to connect my pioneer C90 control amp to my pioneer M90 power amp


the audio output of C90 control amp.is in the>INPUT of your pioneer M90 power amp.
message me if ever not ok..

Jul 17, 2008 | Pioneer Audio & Video Receivers

1 Answer

Vsx-d810s anlogue to digital switching problem


The 7.1 input is for the discrete *analog* inputs, ie your dvd player has a built in decoder and has
eight analog outputs for the eight 810 inputs. Digital stopped at the dvd player.

Jul 13, 2008 | Pioneer VSX-D810S Receiver

2 Answers

Thumping Subwoofer


Ive seen this problem in alot of audio setups in vehicles but most peeps dont know this is not a good thing and will cause damage to your woofers or amp. 99% of the time it turns out to be as you said that bad boy muting circuit. alot of these curcuits do use separate transitors or diodes as mute switches but most of them are directly from the Microproccessor. Only way to trouble shoot this is with a schematic and a good car stereo tech. Good luck

May 25, 2006 | Yamaha RX-V2200 Receiver

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