I have a similar issue, except the hum only occurs for 4-5 minutes after powering up the unit. The level of hum is unaffected by the volume control, but is greatly reduced by the mute. The hum is on all channels. Looking at the schematic, there are only a few stages of amplification between the volume IC and the mute - all share the same regulated +/- 15 volt supply. My bet is that either the +15 or -15 volt bulk storage cap is going bad on my HK AVR110. When I have time, I will open it up and use my vintage scope to confirm my diagnosis
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Ensure that your speakers are connected to the terminals that you have your speaker selector switch turned to. Then check that you have your device, whether it be a CD or DVD player, or turntable, plugged into the correct input and that you also have the correct input selected on the receiver.
I think I had the same problem. This is how I fixed it.
I have my vizio 42 hooked up to a Harmon Kardon surround sound, and the digital cable box. Essentially, I can adjust the volume 3 ways - through the tv, cable box or av receiver. The humming sound happens when you have the volume maxed out on the av receiver and not the cable box.
For example, the sound level on my Harmon Kardon goes from -10 (lowest) to 10 (loudest), with 0 being the middle ground. The buzzing was happening when the Harmon Kardon was set to 10, and I was using the cable box volume to adjust the sound. To fix it, I turned down the volume on my receiver to 0, which may be about 50% max volume of the receiver. Then, I switched devices and used the volume on my cable box. This got rid of the static I was getting. Hope that helps.
Usually Humming noises come from frequency interferance. In this case it is being caused by your input sources. A smiply solution is to replace the cables and or seperate the source cables away from any electircal cords or sources.
Looking in the manual (link below) I see that this receiver uses 8ohm speakers, check that your speakers are 8 ohms or more. I think that connecting 2 sets of speakers to the same output is the problem as when you connect speakers in parallel (i.e. just twisting both pairs of wires together) you effectively half the impedance. So if 2 sets of speakers of 8ohms are connected this way the result will be 4ohms which is too low and will cause the unit to go into standby. Try removing the additional front speakers & see if the fault persists. If it does then it is likely a fault in the wiring.