Soldered it in and no more buzzing and the cap doesn't get hot. I tore apart an old BEFSR41 I had and found a capacitor on that board that matched the specifications of the suspected problem cap in the WRT. Upon further inspection of the board, I noticed that the capacitor immediately downstream from the beads was extremely hot to the touch. Also, I would rather correct the root cause than try to cover up the symptoms. I decided that the glue idea would be messy and probably not fix the high pitch noise. However, holding the wires within the bead still by hand stopped the buzzing, but still allowed a high pitch squeal. I saw mentions on other forums of using some sort of glue/RTV/enamel on the torroid choke (doughnut with copper wire wrapped around further down on the board) so I though maybe I could do the same to the ferrite beads. I have tried three different PSUs to no avail. Some have suggested replacing the power supply unit. As ghost6303 mentioned, there is nothing wrong with the choke coils themselves, rather another component is generating some sort of stress on the coils which causes them to function other than expected. The choke coils ('ferrite beads') as mentioned before were vibrating at an audible frequency. There must be others out there looking for answers too.Īnyway, I have a WRT54G v2 that was doing the exact same thing. I have seen many posts out there about similar problems and many suggestions but no definitive answers or others' actual experiences attempting to fix the problem.

I know this thread is over a year old at this point but I was searching for the same problem and ran across it.

Linksys router blinking