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Dead amp i have a pro sound 1000w amp the fan runs when switched on but thats it any ideas why no sound not even a hum !

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  • Audio & Vide... Master
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Los circuitos amplificadores de audio deben de estar dañados hay que remplazarlos.

Posted on Apr 04, 2008

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What could be the issue with my sub woofer power?


Many of these SUB amps ended up with Capacitor failures in the Power supply section . Find someone who works on amps or TVs to have a look see.

May 26, 2014 | Polk Audio Polk DSW PRO 550WI Subwoofer

1 Answer

I have Sansui G-9000, and its phono stages emit a buzzing/distorted sound even if a turntable is not connected. There is also no sound coming from the left speaker (I already tried switching the speakers,...


The Phono section has a very high level of amplification and so the audio input is very sensitive. So a possible faulty/loose grounding of the input can create a HUM which can be due to even a poor shielding of the input from stray AC factors. So you need to check for the these factors that can bring in the hum , you can confirm by isolating the phono circuit and working to the faulty stage.
Also it can be due to a faulty power supply - non filtering in DC- to the phono preamplifier.Finally faulty capacitors in power and feedback circuits can be a reason- check the negative feedback circuit which can be an op-amp with a feedback , check the capcitors here as a higher amplification can also be a reason.- check the preamp IC.

Oct 08, 2011 | Sansui Audio & Video Receivers

1 Answer

My Marshal Amp MG50DFX sound is very soft even tho the volume is on max. when I switch on the gains circuit and turn up the gains control there is louder sound, but a humming niose also, what can the...


First of all please check your cables because this kind of problems mainly arise due to cable errors.Second solution is check your input.For an example try a another input from a DVD player or etc.Third solution is ,you have to check your amp's mic volumes,please reduce your mic volume fully.Check you equalizer too,Please check and inform me if it doesn't work

Sep 15, 2011 | Audio & Video Receivers

1 Answer

I was wonderin if you could run a 1000w car sub of this home theatre amp?


that amp is meant to be used with a self powered subwoofer i wouldn't recommend trying without possible negative equipment failure dude hope this helps

Nov 17, 2010 | Yamaha RX-V395 Receiver

2 Answers

I have a Sony STR-DG520 5.1 receiver. My problem is that I can hear a high pitched background whine from all the speakers, even if the volume is set to zero or muted! If I switch the audio source off, the...


do u have the unit earth grounded? sounds like AC hum, most amps have a ground lug, make sure that is grouned and the power plug to o the amp has a good ground.

Jun 15, 2010 | Sony STR-DG520 Receiver

1 Answer

No right channel output after fuse blow out


Sounds like the power transistor(s) on that channel burned out. Needs service.

May 04, 2009 | Audio & Video Receivers

1 Answer

MY BASSMAN 100 MASTER VOL MODEL FROM 1972 HAS A HUM IN IT...? WHA


Well where do I begin. First, the polarity switch on the back might eliminate or reduce the hum, but by todays standards the way it functions is a deadly safety hazard (remember all the musicians that got fried in the '60's and early '70's?). That circuitry should be disabled and the unit retrofitted with a 3 prong power cord.

Next, the tube filiments are powered by AC voltage, and there is a control on the chassis for balancing it in order to reduce the hum. It could be toast or mis-adjusted. There could be a tube or other component problem causing your hum. The DC power supply could have faulty filter capacitors.

Another source of problems in these amps are the carbon resistors that introduce static noise in the audio. These should be changed to much better carbon film resistors.

If you are not comfortable working on electronic equipment with voltages in excess of 300VDC you should bring it to a pro audio repair shop.


Apr 16, 2009 | B&K AVR-202

1 Answer

STR-V444ES just hums


Sounds like the output stage is shot.
Here are a few things to try. If there is an option in the manual to reset the unit to factory settings, try that.
If that doesn't work, disconnect all of the peripherals, and select the radio. If you get sound there, you may have a bad cable.

Beyond that I would say the amp needs repaired.

Cheeres

Jan 01, 2009 | Sony STR-V444ES Receiver

1 Answer

PEAVEY TRANSTUBE AUDITION 110. PLUG UNIT IN POWERS UP . SITS THERE AND HUMS LOUDLY. SPEAKER WORKS. plug guitar in can hear it faintly, push lead chanel button in , hum gets super loud. HUM IS IN PROPORTION...


There should be an 8 pin IC close to the input jack that will be marked 4558 or 4560. This is an Op-amp Ic that is the most likely cause of the problem. Replace that IC and report the results here.
Dan

May 27, 2008 | Audio & Video Receivers

1 Answer

Yamaha RX-V995 no power no audio [dead]


sounds like a short in the cpu of the unit

Mar 02, 2008 | Yamaha RX-V995 Receiver

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