Right speaker give out a low humming noise at stand by mode; speaker plugs are poperly pluged. but seems a bit unstable . moving the wiring seems to help a bit- reduce hummiing noise level but can't eliminate noise completely
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Mine did the same thing then I found the solution by accident. After reading a post about moving the sub to different positions and making sure connections were tight to the sub , I loosened the right speaker connection screws to the sub and noticed the humming stopped completely . I know it sounds crazy but it worked for me.
I had this problem also on a different set top box (STB). What I did to get rid of that annoying humming noise was to unplug the RED plug only (from red, yellow, white combination) from the back of the STB, YEY!!! peace!!! This did not interfere with the picture or audio quality.
1. Turn tv on 2. Input mode should be tv 3. Turn volume to zero 4. With remote enter 9 8 7 6 5. A menu will appear on left side 6. Arrow down to backlight and with right arrow key move number from 81 to 83, press menu button twice, 7. Turn up volume and listen if hum is gone.
hello, the speakers are fualty or have a shorted connection if they came with the tv contac your seller and arrange for a replacement imediately dont wait. since they are giving you feedback dont use them they may cuase other fualts in your tv, any component thats cuases hum or noise when pluged into the tv should not be used at all.
one important thing is to have a grounded plug this also may cuase fualts down the line,
if posible get a power line conditioner or ups (uniteruptable power supply)
flat panels are very over protective you dont want the tv to start blinking. since flat panels have built in protection circuts any slight short or fualt may cuase the wide screen to go into circut shutdown mode and this will cost you more if the speakers create a short in your audio circut it may damage your widescreen internal boards and cuase a system shutdown circut (red light flashing no picture)
contac your sellers site let them know your speaker are cuasing a loud hum
and that you will need the speakers replaced these are definitely fualty
if you dont have any coverage or you got the set as is then dont take any chances use other speakers.
if you are electronically inclined you can open these up and find out whats wrong with them internaly it may be a loose connection, since opening up the equipment may void your warantee contac the store first see what they say..
good luck happy holidays
I don't know the design of this reciever, and do not have any schematics or engineering information to know the design.
This is a general comment:
In many of these recievers at this level they don't have very good muting designed in to their system. When switching sources, the audio is not being muted.
This is a theory of why the noise is not on the main speakers, but present on the sub woofer. Because the switching noise is of very low frequency, this is why the sub woofer is making noise. The main speakers lack the low frequency sensitivity that the sub woofer has. This is one way of looking at it. It is also possible that there is muting for the main speakers, and none for the sub woofer.
If the reciever does have muting in to its design that is supposed to mute when switching modes, then there is an obvious defect. When a source is switched, or a mode is changed, the output would mute for the duration of the switching interval. This is usually for a period of about 100 ms.
Your best bet is to contact the service rep for nakamichi and ask the question there.
I have serviced many recievers made by other manufactures. The higher end models all had muting in their design. This way, the output was muted when the source was changed, and when the reciever was turned off or on.
If it is a low frequency hum(mains hum) you hear, the power supply is the wrong type. A 12 volt one will do but it must be a regulated type power supply. It will say this on the power pack itself if it is. If NOT, it will probably say nothing. Happy to answer any questions you may have, just ask away :)