Question about Home Theater Systems
There is a humming noise coming from each speaker (5). The noise can be heard with the volume low and no input to the reciever.
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
Posted on Aug 20, 2010
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