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Amplifier overheat`s afet a couple minutes and shuts off....but still keeps on getting warmer and warmer till it's boiling???

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Have your speakers checked for possible impedance chnage, probably shorted one of the coils. otherwise if this is a new set then possible that you have a mismatched speaker impedance, using a speaker set with lower impedance than the minimum required. specially if you're using multi channel amplifier. shutting off is a protection, that makes your system safe for damage

Posted on May 22, 2008

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Not powering on


To troubleshoot amplifiers when it's not starting up

check the base to base voltage of driver transistors might be too high.

Make sure that the amplifier's ground wire is tightly attached. If it doesn't look too good then take it out and clean it. Use a metal brush to clean that area.

Low power may cause your amplifier not to turn on. Make use of voltmeters to check if your amplifier is getting the right amount of power for it to work. Amplifiers need 110 volts or less to function if the power coming in does not reach that it means you have la defective power cable. If the power is alright and it reaches a minimum of 110 volts, and your amplifier still doesn't turn on that means that there is a problem with its power supply. Checking an inline fuse helps you to determine the appropriate amp ratings when you troubleshoot amplifiers. This is the best way to troubleshoot amplifiers with power problems.

To troubleshoot amplifiers that seems to be on standby mode

Look into your input sensitivity. An input control allows you to match output voltage that is coming from the main unit going to the amplifier then to the stereo speaker. The amplifier shuts down if the gains are
adjusted too high. This is simply because it overheats when it is set too high thus it automatically shuts off. When you troubleshoot amplifiers and this happens you will notice that the volume gets lower even if the setting is too high. Be aware of the optimal levels of the components when you troubleshoot amplifiers.

Your speaker's electrical impedance may also contribute as to why your amplifier may be turned on but doesn't seem to work. Impedance is the amount of current which flows with a specific voltage throughout the transistors, capacitors, etc. Just see to it that your amplifier and speakers equal in impedance range when you troubleshoot amplifiers. Use the voltmeter to check the impedance range when you troubleshoot amplifiers.


Take care..

Sep 14, 2011 | Audio & Video Receivers

1 Answer

What could be causing a power hum for about 1 to 2 minutes after startup? Sony STR-DE825


Depends where the hum originates. If it is from the case, it is likely from the transformer which may rattle laminations a bit till it warms.

If it is out of the speakers, then the amplifiers MAY not be balancing till warm up... that would not be good... keep your eye on that and if it gets loud, take it for repair ASAP.

If unit is old, the filter caps may be going bad OR there may be a bad solder joint in the power supply area that doesn't contact till it gets warm... that also needs fixing ASAP.

Dec 26, 2009 | Sony STR-DE825 Receiver

1 Answer

ITS ON STANDBY MODE & NOT ABLE TO GET ITS DISPLAY


Try this, not sure if the same would work for ya.

Swich off the amplifier.
Prior to the process check the wires connecting the speakers are not creating a short circuit which is apparently putting the amplified into a standy mode.

1. Press the "A" "B" and power key all at the same time and hold on to it.
2. The amp will go into a reset mode and will keep blinking till it gives a normal "click" sound and the amp turns on.
3. this process would take about 2 - 3 minutes.
4. You may then release the buttons.
5. If it goes into a standby mode again and does not power on, or the standby keeps blinking, get assistance from the engineer.
6. Once it is on, you shall need to do the resetting of alll the configurations done earlier.

Hope it works, it costed me 3k to get the job done.

Nov 12, 2009 | Denon AVR-1603 Receiver

1 Answer

Yamaha HTR-5830 Video shut down.


You have having a problem with the video amp clipping the signal after it get hot. You have one way to try to temporarily solve this problem. Try putting more air flow over your receiver and cooling down the temperature inside the receiver and see if the video amplifier starts working correctly. If it does then you must put a fan on it somewhere that will keep the air flowing so the video amplifier is not allow to overheat. If this does not solve the problem, then you will need to have the amplifier replaced for it to work correctly. If the unit is under warranty then call this number 1-800-492-6242 to locate a service center in your area. Call them for help with your problem. You can also try looking on the www.yamaha.com website. Put in you model number and check in the frequently asked questions and troubleshooting sections for people who have had similar problems with this unit and see if they printed a solution for the problem. I hope this helps you with your problem.

Mar 05, 2009 | Yamaha HTR-5830 Receiver

1 Answer

Denon AVR-4802R automatically shuts off in multi-zone mode


i had the volume of the multi-zone tuned too high and was attenuating it in an external control box. Once i took the multi-zone volume down to -25db, the problem went way. My main zone was operating around -35db so did not have the problem.

Nov 23, 2008 | Denon AVR-4802 Receiver

1 Answer

Receiver cooling fan stays on


Maybe the audio amplifiers IC´s are in bad conditions you need to replace them

Nov 01, 2008 | Audio & Video Receivers

1 Answer

Samsung 5-Disc 1200-Watt Home Theater Surround Sound System My Home Theatre System is keeps shutting down by its self. before it shuts down the screen says protection mode and then shuts down. i have...


If the unit shuts down almost immediately without sound, you have an electronic failure of the audio amplifier.

However if you must play the unit up above quiet background levels, you likely have a shorted speaker wire. With home theater systems, you have the luxury of trying different surround modes and speaker level settings. It's not unusual, for example, to have a loose wire strand going to the center speaker. In stereo, the system works fine. As soon as you switch to a surround mode, the amplifier senses the short and shuts down to protect itself.

Check those wires really close - I bet you'll find it there.

May 15, 2008 | Audio & Video Receivers

1 Answer

SX-SR604 KEEPS SHUTTING OFF


Los amplificadores de audio estan empezando a fallar.

Mar 13, 2008 | Onkyo TX-SR604 Receiver

1 Answer

Turns on then shuts down


It sounds like the amplifier protection circuit is kicking in. This usually happens due to a fault in one or both channels. Check that your speaker wires are not shorting out - try removing them and switching on.

Dec 10, 2007 | Yamaha RX-V2090 Receiver

2 Answers

Front speaker channel cut off


I lean toward an overhating condition since the unit does not go into protection mode right away, and then returns.

My thoughts are as follows...

1) The receiver needs better ventilation

2) The speakers are below the rated minimum nominal impedance, causing the amplifier to strain and overheat

3) There is a problem within the amplifier that is causing this problem - this is not user repairable.

I'd try another pair of speakers which are rated at 8 ohm nominal impedance and give it a trial. At the same time, monitor the heat output from the unit (note that modern amplifier sections do run hot). If the unit runs extremely hot at a low volume and still shuts down on 8 ohm speakers, it's time for service or replacement depending on value.

Oct 30, 2006 | Sony STR-DB940 Receiver

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