Hey there...my refurbished Onkyo receiver buzzes with or without anything connected to it and at various times. It'll be fine one minute and the next it will be buzzing like crazy. The buzz is coming directly from the unit and not going through the speakers when connected.
Can anyone tell me what is going on with it and what I can do to remedy the buzzing?
I just opened my tx sr606 and I have the same problem. It seems to only start when the receiver warms up. It starts of low and gets louder. It makes the noise even without anything hooked up and the volume all the way down.
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Re: AV Receiver buzzing with nothing connected
Do you have any warranty on the refurbished unit? I would be first attempting to pursue the supplier that sold it to you to resolve the problem.
If not.... the buzzing is caused by a loose lamination in the power transformer. Replacing the transformer will solve the drama. there are a few things that you can do to attempt a repair. These are the measures that I have found to have worked in the past when repairing this sort of problem.
Check and tighten all the casing and transformers mounting hardware/screws. Tighten any screws that pass through the transformer also. Try the amp to see what happens. If still buzzing, onto the next step.
To settle the loose lamination, you can try to "Tap" the outside metal parts of the transformer about the laminations from several different directions with a ball peen hammer (round end). You could also use a center punch to do this to produce a mechanical dent that puts pressure onto the laminations to resolve the problem.BEWARE- DO NOT HIT THE WINDINGS OR PLASTIC PARTS OF THE TRANSFORMER. The amount of force that you use here is up to you. don't go overboard, and watch your aim, don't hit anything but the transformer. It will often take some "denting" to produce the result we are looking for. Try it and see what happens
Put a spacer under one mounting tab of the transformer to "flex" the casings. You may need to try all corners.
Keep trying different combinations of the above, and hopefully you will be able to resolve it. Sometimes, there is nothing you can do but replace the transformer. I would spend at least 1 hour mucking around with it in the fashion described above, and you should be able to stop the buzzing. , I hope that you get it sorted. I have many times in the past. Good luck, let me know how you get on. Cheers
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Hello Joseph, I would try a power cycle of the unit where you unplug it for 10 minutes. The significance of this is that it will allow you to obtain a fresh network connection with the receiver. If this does not work I would try a processor factory reset of the unit. Thanks, FJD
This kind of noise can be caused by a transformer that was poorly made.
Iron core transformers are normally 'potted' in a vacuum so that epoxy (or lacquer) is forced into the laminations to prevent them from trying to vibrate with the line frequency.
If you are adventurous, remove the housing, turn on the power and using an insulating probe such as a plastic rod (a plastic picnic knife will work), place the tip of it on any larger parts you see and place the other end behind your ear.
This will carry the sound in a more directional manner to your ear.
You should be able to locate the source of the buzz.
If you can, and it turns out to be a transformer, it will probably have a metal shield around it so it might not be possible to gain access to the laminations.
If the shield isn't ultra tight, you might be able to flow some 'Super Glue' into the cracks and with luck, 'glue' the laminations together.
Super Glue (or equivalent) is a good insulator so will not cause any electrical problems but take care not to get it on any plastics that are exposed with the housing on, it will cloud them forever.
I’m writing this report to provide insight into a common Okyo issue.When my Onkyo receiver began to malfunction my first response was to search the web for answers.What I fond was conflicting information. While all system issue may be unique, I hope this report shed some light on the subject.
System Breakdown: Receiver: Onkyo TX-SR606 7.1 Channel Home Theater Receiver (Black)
TV: Samsung - LN52A750 - 52" LCD TV - 1080p
Component 1: XBOX 360 Elite
Component 2: PS3 120GB
Cables:Mediabridge Ultra Series - 10ft High Speed HDMI Cable - Version 1.3 Category 2 - 1080p - Blu-Ray - PS3 - W/ Nylon Sleeve Issue: When I first setup my Onkyo receiver it worked perfectly.Over time, my TV would display “Searching for Signal”.After about a few minutes the receiver would detect the XBOX 360 and work fine.At first it was no big deal until the problem progressed. The receiver began to take longer and longer to detect the signal from the XBOX 360.Finally it would take up to 30 minutes or would not detect a signal at all. Finally I went through the process of changing out the HDMI cables and switching ports.This did not work, so I call Onkyo.They walked me through a reset process that did not work.Finally they recommended that I take it to an approved Onkyo repair shop. Lucky for me there is a repair shop in the suburbs of Chicago about an hours drive from my location.There are not many approved Onkyo repair shops. Most people would have to ship their receiver to another state. I took the receiver to the repair shop.They seem to have a nice little scam going on… Here is the scam.. They tell you there is a 3 to 4 week wait time (or longer) until they can even look at your receiver! BUT, if you want to put it on the “Priority List” you can pay a $30 non refundable fee not covered by your warranty.Then you would only have to wait about a week.Tell me, who would not op for the priority list when your entire entertainment system is managed by the receiver?!?!?So I payed the $30.About 4 days later I get a call from the repairman.He says, all the HDMI ports work but they don’t have an XBOX 360 to hook it up to.So he can’t validate the problem.After arguing with him for an hour and listening to him cry about how crapy Onkyo receivers are and how hard the company is to work with, he agreed to do some research into the problem.I told him many times, simply look on the internet many people are having the same problem.Onkyo has to know something about this. Finally about a week later I get a call from the repair guy.He says he thinks he knows what the problem is.He has to order some capacitors and I could pay $45 for priority shipping.Umm wait one minute, I already paid $30 for priority service now you want me to pay more for shipping?No thank you!Over time I simply rewired my system to work without the receiver and to tell you the truth I almost forgot about the receiver.Finally I got a call from the repair shop about 2 months later saying I could come pick up my receiver.I talked to the repairman. He said the following… Solution: There are 4 capacitors that malfunction over time.It’s a common problem with Onkyo receivers. When the capacitors begin to malfunction you get intermittent signal response until it does not work. He could not explain why the cable still worked (everything was hooked up with HDMI cables). If you are experiencing this problem. I hope this helps save some time switching out cables and guessing why your system is not working. - Antious
The "buzz" you hear is a power hum made by the power supply transformer. It's technically called "Lamination hum" caused by the revering of electrical current through the power supply transformer. In some cases the hum can vibrate the chassis causing other loose material to vibrate. If you can, go to your dealer and check to see if other units of this same type typically make a hum this loud, and if not, see if he can solve the problem for you.