[5.1 Ultra - Loud Humming - Control pod or amp?]

On 5/25/2020 at 3:44 PM, Need4Speed said:

 

Another win!  Thanks for this ancient thread.  My ProMedia 5.1 recently started buzzing loudly through the subwoofer, and I thought it was toast.

I first replaced the two easier capacitors on the power supply board that others have replaced.  No dice.

 

Then I moved on to the two mentioned by stpete cooling.  After carefully replacing them and plugging the unit in, sweet silence!  (Well, sweet until I connect my speakers back up and run some music through it!)

 

Thanks!

 

Update: after hooking things back up, the sound is back and is beautiful!

 

[5.1 Ultra - Loud Humming - Control pod or amp?]

On 5/14/2010 at 4:27 PM, stpete cooling said:

The hum is almost certainly from one of two 100mFd 35 volt capacitors on the main board next to a pair of small, black heat sinks. You have to be careful removing the old capacitor that you don't damage the leads--they are a bit difficult to access with a soldering pencil. I always replace these as part of every repair--the hum is so common on older panels. I recommend using 105 degree Celsius capacitors, in place of the original 85 degree rating. I also bend into a "Z" (offset) the lead that will be closer to the heat sink so that the capacitor is mounted as far from the heat sink as possible.

The control boxes on eBay vary widely in price. One sold for $82 plus shipping this week; another sold for $24 something and shipping.

 

Another win!  Thanks for this ancient thread.  My ProMedia 5.1 recently started buzzing loudly through the subwoofer, and I thought it was toast.

I first replaced the two easier capacitors on the power supply board that others have replaced.  No dice.

 

Then I moved on to the two mentioned by stpete cooling.  After carefully replacing them and plugging the unit in, sweet silence!  (Well, sweet until I connect my speakers back up and run some music through it!)

 

Thanks!