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My 5.1 channel digital amplifier wont turn on it just turned off and was hotter then usual

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You need a voltmeter for this and would have to check for DC on the speaker output terminals. Once you attempt to turn the unit on (before it quickly goes into shutdown), look for any DC voltage over
0.3V across any of the 5 outputs. If so, the digital amp IC is shorted and would require replacement.

Most common reason for failure of a digital amplifier IC is a speaker impedance change or wiring problem. You CANNOT connect any of the grounds together for any reason as the amplifers have floating grounds in respect to chassis ground and each other. The amp circuits often will tolerate this for a short while before eventually shorting out.

Your description of excess heat coming from the unit may also indicate a fan problem. Most brands have sensors built into the fan to confirm operation and can also cause shutdown if not running fast enough or at all...

Mark

Posted on Nov 23, 2008

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1 Answer

JBL GT5 A402 amplifier wont stay on


try isolating if the ground is the issue and ground it to something else using an extension wire and perhaps the hinge of the car door.

If that is it then find another permanent ground

Mar 15, 2013 | JBL Gt5-a402 Gt-series Class Ab 2-channel...

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JVC 6010V shows zero on volume wont go up or down


This is a fault on the D/A digital / Analogue converter , The volume control being analogue is not processing the data in the cicuit and so there is no change in the level. This can be a fault in the IC - the D/A convertor IC which is not giving any response with the turn of the potentiometer. So check this within the amplifier ONLY if you are able to trace the circuit and replace the IC connected to the potentiometer.

Oct 21, 2011 | JVC RX-6010V Receiver

1 Answer

Everytime i try to play my system at full volume it cuts out then keeps playing and carries on doing this to i turn it to a certain volume


First of all find out the recommended speaker impedance for the receiver. Then find out the impedance of the speakers you are using along with it.
Simple rule is the speaker impedance can be higher but not lower than the recommended value. If it is so the receiver will run hot and if you turn up the volume higher it will run even hotter and then the protection circuit will cut off the Amplifier output to prevent burn out of components. Even if you have one defective speaker this cut off can happen. To confirm defective speaker -- disconnect one speaker at a time and turn on the amplifier and play it at cut off volumes.If by disconnecting one particular speaker the Amplifier does not cut off -- THAT SPEAKER HAS A SHORTED COIL and needs replacement.

Apr 03, 2011 | Philips Audio & Video Receivers

2 Answers

Pioneer vsx_D710S whatever can be the input source,the flag " poweroff" apears and switch off the system. Seems to have no time rules, shut down frequency connected with hazard ...... No...


I'm not sure what kind of an answer you are looking for. If you are not qualified to do some soldering rework and ready to spend some money (could be as much as 50$) for parts, you better look for a professional service that in most cases will cost as mush (or more) as your receiver.

If you are still reading then here you are. This is a common symptom of a blown hybrid amplifier IC caused by shorting speaker output while it's powered on. There are two protection circuits for amplifier output, Overload and DC output. In your case, most probably, DC output protection is the one that shuts down amplifier to prevent further damage. Find schematics (service manual). To confirm this, look for amplifier inputs connector, measure DC DET. signal, normally it should be around +4.85V. If right after power up it goes down to almost 0V, then it is for sure a blown output on a Hybrid IC. Check whether receiver shuts down with that cable unplugged. If not than get ready to do some rework.

There are two big Hybrid amplifier ICs, one that outputs two channels (usually front left and front right) and 3 channels (for the rest). One of the outputs (if not more) one one of them (if not both) is blown. In most of the 5.1 Pioneer receivers 2 channel IC is PAC010A and 3 channel one is PAC011A. If you want to get original parts and will find those for less then 40$ each you are lucky. There are however cheaper replacements from SANYO, those you can find for around 10-15$.

Find schematics, unsolder resistors one by one that connect AMP outputs to DC detection circuit on each IC and check which one is blown. There are 2 for 2 channel one and 3 for the other. Usually if one output is blown all others on the same IC are blown.

There could be a chance that only one channel on IC is blown, if you want to fix it you still need to replace whole IC. Also, instead of spending on new IC you may want to sacrifice one working channel (center for example) to output the blown one (so you'll get 4.1 :) ).

Nov 11, 2010 | Pioneer VSX-D710S Receiver

1 Answer

Only get sound out of right side both a and b


Good day sir, Hi, your Philips receiver trouble can be any of the ff:
  1. your receiver left fuse is blown, check if it has a user fuse at the back. or
  2. your main IC amplifier for the left channel is bad. you need to replace that IC, but check first the wiring of the speakers.
  3. Check your receiver left speakers if it is producing a soft hum, to do this turn down the right channel, or adjusting the balance knob to the left, or simply remove the speaker connection of the right channel. place your ears on the left speaker as you adjust the volume up and down, do you hear a soft hum that goes up and down also? If yes the problem is on the source section before main amplification, usually the pre-amplifier stage, If you hear no hum at all. problem with the main left amplifier. The main amplifier is usually a single IC for both left and right channel, OR one IC amplifier for the left and one for the right, in both cases, replace the bad IC.

Jan 21, 2010 | Philips Audio & Video Receivers

1 Answer

Harmon Kardon AVR 5


Assuming that the system is properly installed and was working ok before, the problem is usually a blown output amplifier in one channel and the receiver disconnects the speakers to avoid damaging them. In this case, professional repair is required.

Nov 15, 2009 | Harman Kardon AVR 5 Receiver

1 Answer

No audio on any channel, even in audio setup mode, no audio headp


If you have any of its sound outputs connected to a TV or tape deck do they get the signal? If so, then we know there is sound processing somewhere inside the unit but not emerging to anyplace that requires amplification.

A quick basic check would be to tune an FM station, run an RCA cable pair from the audio output for a tape deck (see the picture at the link) to an analog audio input on your TV. Select that input on the TV and you shouls hear the FM station, or anything the receiver is configured to play. If it's silent then there is no audio signal circulating in the receiver to get out to the amplifiers.

http://www.onkyousa.com/images/hookup/TX-SR803/detail_tapedeck.jpg

Check to make sure Multi-Channel input is not selected unless that is what you're listening to as it bypasses all other sources analog and digital EXCEPT the tape; and check any Mute or Zone Controls, too.

If you hear the program on the TV but not through any attached speakers, then the amplifiers are all disabled for some reason. The click I asked about before... when you turn it on does it get a click about 5 seconds later. That would be the protection circuitry turning OFF to allow the amplifiers to function.

I notice it has a Tape function. Make sure it isn't selected as it assumes a tape deck or processor is attached and will only play back what would be coming FROM the tape deck or processor. On my Pioneer receiver it also disables any digital signal processing.

Sometimes when I'm watching TV with the remote on the seat someone moves and something bad happens. It's always some unfamiliar button that gets touched unintentionally. Look over the remote for things like MUTE, Multi-CH, Tape.

Apr 02, 2009 | Onkyo TX-SR803 Receiver

1 Answer

Bad main right channel ( no out put at all )


I had the same issue with this same receiver. Unfortunately this is a known problem with this receiver and Yamaha knows about it. The usual fix is to have the input RCA connections in the back replaced to some updated ones. What has happened is that there is a shirt created using the current RCA input jacks and it is actually turning the internal amplifier off to that particular channel or channels. My local stereo shop ( who is a Yamaha authorized service center) knew about this and replaced mine to the tune of $200.00. Good luck

Mar 29, 2009 | Yamaha RX-V1 Receiver

1 Answer

I got Sony XMZR604 4 Channel Amplifier in my car and it is not working any more. The red power protector indicator is on. I have checked all the connections but it is still not working. Can u plz give...


This usually means that the speaker outputs are being shorted out or ground is not secure. My suggestion is to turn it off and recheck your ground and speaker wires to check the are secure.

Oct 08, 2008 | Audio & Video Receivers

1 Answer

TX-SV525 Onkyo Receiver


NOOOOOOOOOOOOO!!! If you have the room for them to run free and loud, keep the 901's in service. Get them a good amplifier because any multichannel receiver can't deal with their special EQ needs and still drive conventional speakers for the other channels properly.

The good news. I have a setup similar to what I think you're trying to do and it works great! Get a receiver that has has 5.1 analog Outputs so you could drive up to 6 external amplifiers if you want to (I drive 4). Then you can draw off the Front L&R to a separate amp for the 901's and the 'other' (lesser) speakers can live on the receiver's native amplifiers.

A separate multi-channel amp for the 901's was my solution. Because I can run each channel independently to an external amp, I run a Carver AV-406 (5-channel amp) for my 901's in Front, 2 Subwoofers (DBX DB-SW 15's) and the Rear Surround channel (Bose 301), with the Active EQ between the receiver Front L&R Outputs and the 901's amp channels. My receiver controls everything and just drives the Center (Kenwood 777's) and Surround speakers (Bose 301's) from its own amps.

You could get by with just a stereo amp for the 901's. A Carver M-200 is a good efficient amplifier that would have you cooking just fine (2x100W). Run it with the Active EQ between the receiver Front L&R Pre-Outputs ** and the 901's amp channels.

** Multi-CH Receiver L&R Audio Out ***) >>> Bose EQ Amplifer IN, then
Bose EQ Amplier OUT >>> new amplifier IN.


Attach the 901's to the new amp, set its volume to Max and run through your receiver's speaker level setup.

Any modern AV Receiver with the pre-requisite analog outputs should work. Since you have to buy a power amp for your 901 front channels anyway the receiver need not be a powerhouse. Look for features and lots of connections for digital and analog devices. I lean toward coaxial digital connectors because A) they take standard >> and cheap << audio cables; and B) they can be shared with Y-connectors if you're careful to have only one digital device turned on at a time. Optical SP/DIF is an expensive farce to get into your wallet.

For DVD/Cable Box/Blu-Ray look for multiple HDMI or component connections. Again, length and cable cost made me look at the component connections vs HDMI and I was pleased that I can't see the difference even with HD programming from my cable box. It's all great.

Feb 08, 2008 | Onkyo TX-DS595 Receiver

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