Denon x4800h new humming noise

[hifimaddy]

i have found this video in youtube . i think it will help you.

 

[hardcore_gamer99]

you can also try this by yourself, but place your multimeter switch to AC before trying anything (I think you know this). be careful

dont know anything but i tried. normally it is showing 245v but on earthing it says only 20v

 

[hardcore_gamer99]

Left is neutral. You have 14v earth to neutral, which means your building earthing has high resistance. Right bottom hole is phase. You should be measuring between right bottom hole and the top big round hole. You should get high voltage between phase and neutral (which will be 14v less than the mains voltage). Ideally neutral to earth should be around 0 volts. This will give you the same voltage on neutral to phase and phase to earth voltages.

If your tester glows on the left bottom side then you have a screwed up electrical wiring. Check which bottom hole makes the tester glow. The hole in which the tester glows is the phase.

this is lol moment. in my rooms some plugs have phase in left side and some have on right side bottom wtf is this? this room of mine on first floor is newly built i have 2 rooms.

 

[hifimaddy]

this is lol moment. in my rooms some plugs have phase in left side and some have on right side bottom wtf is this? this room of mine on first floor is newly built i have 2 rooms.

because I think the electrician you called to check earthing maybe he have done the wiring.

 

[mbhangui]

this is lol moment. in my rooms some plugs have phase in left side and some have on right side bottom wtf is this? this room of mine on first floor is newly built i have 2 rooms.

Your builder is probably the culprit. He got a lousy electrician to wire it. Or someone else re-did the wiring. It is dangerous to have phase on the left side. All 3 pin electrical equipments do swithing off and on using the wire that goes to the right side of the electrical plug. Having phase on the left side means in case any electrical equipment has leakage inside and the equipment has a metal body it becomes a live killing machine. In such a case only protection would be the ELCB which should trip when it detects current flowing from the earth to the live.

You can test this. Take a electrical bulb in a bulb holder. Connect the wires between earth and phase. The moment you connect the electrical supply to your house should go off and you will have to turn on the ELCB breaker to turn the electricity back on.

Taking a bath when the geyser turned on also becomes extremely dangerous. Take care. You need to get a qualified electriction to fix the wring issue. This will not fix your denon hum issue but it will make your house safe.

 

[hardcore_gamer99]

ok so the top modular socket which was installed when my new room was built and underground wiring done has phase on left side and recently i have got these sockets on bottom which are 4 in total are coming out of this top modular socket. Now these recently installed sockets all have phase on right side but on top modular socket it has left side phase. any issues? should i get phase rewired?

 

[mbhangui]

ok so the top modular socket which was installed when my new room was built and underground wiring done has phase on left side and recently i have got these sockets on bottom which are 4 in total are coming out of this top modular socket. Now these recently installed sockets all have phase on right side but on top modular socket it has left side phase. any issues? should i get phase rewired?

Yes. Do get the phase rewired where you have the phase on the left side. meanwhile tell me the phase to earth voltage reading. This wiring must have been a local electrician you hired to get those sockets fitted. Don't ever take any electrical/earthing advice from him.

Now that we know that the wiring is a mess. Please check every socket which has a switch. The tester shouldn't glow in the phase hole when the switch is in the off position. Bad electricians sometimes put the neutral in the switch instead of the phase.

There are 3 common things that bad electricians do in India
1. Interchange the phase, neutral wires
2. Sometimes use the neutral wire to the switch
3. Join wires by removing the plastic using the mouth and teeth as a wire stripping tool and then twisting the wires and then wrapping that mess with an insulation tape. Joints should be crimped using butt joints.
4. Make the same mistake in point 3 for geyser and AC wiring. This becomes a fire hazard as copper will oxidize over time where wires are twisted to join them. At these twisted wire joints, heat will get generated once the copper oxidizes and causing fire. When you hear buildings catching fire because of air conditioners it is because the electrication joined wires by twisting exposed copper wire ends

You join wires by using butt joints like these

 

[hifimaddy]

ok so the top modular socket which was installed when my new room was built and underground wiring done has phase on left side and recently i have got these sockets on bottom which are 4 in total are coming out of this top modular socket. Now these recently installed sockets all have phase on right side but on top modular socket it has left side phase. any issues? should i get phase rewired?

Live or phase is always on the right side of the socket, and neutral is always on the left. This is always similar in the Indian socket, US, European, or UK. So basically all electrical equipment with 3 pins is designed for this. I don't know about 2 plugs. so better to check with a well-experienced electrician.

 

[girishtd8262]

Live or phase is always on the right side of the socket, and neutral is always on the left. This is always similar in the Indian socket, US, European, or UK. So basically all electrical equipment with 3 pins is designed for this. I don't know about 2 plugs. so better to check with a well-experienced electrician.

Don't play with electricity.what is preventing you from calling an electrician.or else send me air tickets I can arrange for one

 

[hifimaddy]

Don't play with electricity.what is preventing you from calling an electrician.or else send me air tickets I can arrange for one

Yes, true. Better, he can call a good electrician and ask them to check miss match phases and also earthing. A good electrician can fix it; it's not an impossible task.

 

[hifimaddy]

send me air tickets I can arrange for one

 

[raghupb]

Difference between phase-to-neutral and phase-to-ground should be less than 1V (ideally 0)

In another way, neutral-to-ground should be less than 1V

For most AV equipment, input voltage should be between 220-240V.

In my home, the mains voltage can go up to 250, so I have a 2KVA stabilizer (servo) that keeps it at 230V (input boundaries 190-260V)

Also, take @mbhangui advice seriously. Get phase connected properly. If neutral-to-ground is 14V as per your observation, then your body becomes a better conductor. You'll feel a mild zap every time you touch the metal parts of equipment.

Cheers,
Raghu

 

[hardcore_gamer99]

because I think the electrician you called to check earthing maybe he have done the wiring.

Phase-to-neutral and phase-to-ground should be less than 1V (ideally 0)

In another way, neutral-to-ground should be less than 1V

For most AV equipment, input voltage should be between 220-240V.

In my home, the mains voltage can go up to 250, so I have a 2KVA stabilizer (servo) that keeps it at 230V (input boundaries 190-260V)

Also, take @mbhangui advice seriously. Get phase connected properly. If neutral-to-ground is 14V as per your observation, then your body becomes a better conductor. You'll feel a mild zap every time you touch the metal parts of equipment.

Cheers,
Raghu

yes when electrical switch in on on wall but avr is not on in actual nd touch its top metal or plastic i feel some static like feeling

 

[Phani24]

yes when electrical switch in on on wall but avr is not on in actual nd touch its top metal or plastic i feel some static like feeling

Here seems all advised you to call an electrician.
But you are a thaliva. Doing what you think right

 

[hardcore_gamer99]

Here seems all advised you to call an electrician.
But you are a thaliva. Doing what you think right

no i did this previously see my previous comments regarding static buildup. in the end my avr has now regular vibration humming thats the issue only

 

[hardcore_gamer99]

Yes, true. Better, he can call a good electrician and ask them to check miss match phases and also earthing. A good electrician can fix it; it's not an impossible tsuppose

Yes, true. Better, he can call a good electrician and ask them to check miss match phases and also earthing. A good electrician can fix it; it's not an impossible task.

suppose there is no earthing at all and my first floor has completely separated SERVICE LINE from ground floor. hiow will earthing be done on firsr floor i have my separate mcb board as well.

 

[hifimaddy]

suppose there is no earthing at all and my first floor has completely separated SERVICE LINE from ground floor. hiow will earthing be done on firsr floor i have my separate mcb board as well.

Hey man, you try to find a good electrician in your place. or ask someone who knows in your town or village. I know some electricians did stupid jobs while working on your house. A good electrician can fix your issues; it's not a big deal. You are thinking humming or vibrations are not related to earthing; maybe true, but fixing your earthing or phases will be good for your equipment for a long, healthy run.

If you can check your AVR in your friend's home with a properly wired home. If it does not make humming, then you know it right. But anyway, fixing your electrical lines will be much safer.

 

[hardcore_gamer99]

Hey man, you try to find a good electrician in your place. or ask someone who knows in your town or village. I know some electricians did stupid jobs while working on your house. A good electrician can fix your issues; it's not a big deal. You are thinking humming or vibrations are not related to earthing; maybe true, but fixing your earthing or phases will be good for your equipment for a long, healthy run.

If you can check your AVR in your friend's home with a properly wired home. If it does not make humming, then you know it right. But anyway, fixing your electrical lines will be much safer.

Right you are. Will check somewhere else first if still hums i will go to service centre as its in warranty

 

[hardcore_gamer99]

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.

tries this just now but same humming

 

[hardcore_gamer99]

Sharing your phase connection with your other house plugs would lead to hum. Even a mobile charger can make this happen. Very long ago, I used a normal plug for my AV and stereo use that made a lot of hum. But now that I have a separate room and direct wiring from my electrical box, this makes a lot of difference—no hum, no noise. (When you take a direct connection from the electrical box to AVR, use the bigger, thicker cable; don't use normal cables.)

2.5mm wire would suffice? to take from mcb to room