hardcore_gamer99
Active Member
Direct connection u mean from where our mcb board is? From there?
Denon x4800h new humming noise
- Thread starter hardcore_gamer99
- Start date
Yes from the MCB, But in my case, I took a separate connection from the electrical meter of the provider, and I am using Separate MCB for my AV room.
girishtd8262
Well-Known Member
Same here .i have taken separate line from the board with a dedicated MCB to the ht room
hardcore_gamer99
Active Member
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If you can consistently recreate the problem at another location (someone else's place where their equipment (ideally another Denon or even better the same model) do not show any signs of being affected then perhaps you can try your luck with the dealer and demo the problem to them. You have to go through a process of elimination to be able to isolate and identify the problem.this guy is saying something else. should i rest my case or NOTPage 2 - New denon x4800h humming sound
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After all this whether you get replacement or directed to service center or just told that it's normal or that they don't hear anything wrong with the AVR depends on the dealer.
You could try contacting Denon, International customer service and make
your case calmly and logically listing what your have tried in a clear logical manner. You may luck out and get an actual technical person or they might just bounce you back to the dealer or service center. If you are going to take this approach prepare to make your case in a clear manner.
One question do you get the feeling of voltage flowing through the unit when you touch it? (be careful trying this though). IIRC there was a long thread on the forum about a particular Yamaha AVR that exhibited this particular issue. I don't recall if there was any humming sound but the feeling of voltage flowing through the chassis was mentioned by multiple people.
hardcore_gamer99
Active Member
yes i feel like it has some weird static electricity build up. when after pressing power button on front i feel it that tocuh is not current but some weird thing which i dont feel with panasonic 4k player
Try it at another person's place and if it doesn't exhibit the issue there then it's probably your electrical system or something at your place causing the issue. If the problem is exhibited at the other person's place too then it's the AVR in which case you should ask Denon for a replacement.
Another thing to check is whether it's just you or another person (s) who also experiences the same sensation when touching the AVR.
The AVR power button is plastic right? In which case there should be no sensation of electricity when touching it. The metal chassis can conduct but not the plastics.
You mention static build up. Try grounding yourself by touching something metal before touching the AVR and see if you still experience the same feeling. If you do then it's not static build up but a low voltage flowing through the unit.
I presume all cables have been disconnected from the AVR other than the power cord right?
Does the AVR have a standby mode (i.e.) when you switch off using the remote but the switch at the socket is still on. In this case the power indicator will be orange instead of green (at least for Marantz AVRs). Do you also experience the vibration/hum and/or voltage when AVR in standby also?
Check your electrical wiring using something like this https://amzn.in/d/39nXkWD to rule out wiring issues.
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hardcore_gamer99
Active Member
i got these new power sockets installed just before installation my system. these all plugs have connection coming down from 1 modular plug which was already on wall. but i checked from plug from my another room on first floor same issue and yes i touched top of panasonic 4k player but was still there so i guess not electrostatic. i will try to check standby mode tomorrow. but now with rubber pads its dead silent. what does this mean? it has issues or not>
hardcore_gamer99
Active Member
the service guy kept telling therre is already noise in background so i feel they are not willing to do anything thats i dont wanna go there it is 70kms and i have health issues as well. if i get surity that he will do something then i can go else futile
Meaning you are getting the sensation of electricity on the Bluray player too?
The rubber pads are just preventing the vibration from resonating in your cabinet. Whatever is vibrating could still be vibrating, you can no longer hear/feel it with the rubber pads in place. If it's an electrical issue, the rubber pads do nothing extra since wood is already an insulator.
Can you take your AVR to a friend/neighbors home nearby that has good wiring and check to see if the same sensation is experienced there too. I noticed that there is quite a lot of ambient noise in the recordings, try and get a recording with as minimal ambient noise as possible. It makes it more difficult for service personnel to dismiss your issue citing background noise. Also try the wiring tester I mentioned in my previous post to check your wiring for any issues.
You say when you pull out the AVR the sound doesn't come. When you push the AVR in the tv unit you are coiling the avr power cord beind the avr. The moment you create a loop / coil of any electrical wire it creates generates magnetic flux that will change at 50 Hz. All sensitive inputs are are on the back side of the AVR and hence any conductor will generate electricity because of nearby magnetic flux. That is how transformers work, wirless charging works, etc. As far as possible electrical power cord should be going straight from the power inlet to the AVR. If any coiling of wire is to be done, do it at a distance behind the tv unit as far away from the rear of the AVR.
Try this. pull out the electrical wire from the left side of the avr. Don't let the power supply cord get cramped up behind the AVR.
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hardcore_gamer99
Active Member
Coiling of wire means? Power cord is already goibg straight to mains socket. Also j removed everything and tried my other room sane issue. Even in the open area on floor it is there the hum of vibration
hardcore_gamer99
Active Member
Wiring tester how?
hardcore_gamer99
Active Member
Weird thing is even touch on front plastic felt the same static like thing
That's vibration then. You won't feel static electricity discharge when you touch plastic, though some plastics help build up a static charge through friction.
Can you try an app like https://play.google.com/store/apps/details?id=org.intoorbit.spectrum&hl=en_IN and record the vibration and then make one more recording with the app with the rubber pads in place and there is no vibration. Ensure the duration of recording use the app is the same in both cases,.
You can then use https://web-toolbox.dev/en/tools/image-compare-slider to compare the images. If the app is able to pick up the vibration then it will show up in the compare.
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By coiling I meant extra wire folded just behind the avr. If the wire is going straight to the avr without any folding (example on the floor) and you are getting that noise without any inputs connected, then there is really some issue. Also that hum did not sound like 50 Hz.
If it is EMI then you should be hearing 50 Hz sound. Install the spectroid android app and can you let me know what the app shows?
hardcore_gamer99
Active Member
hardcore_gamer99
Active Member
denon international has said it is normal sound
I am not getting that sound. But thats normal transformer sound. Nothing to worry i guess
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