Humming sound in Beomaster 3300. No radio, just everything else.

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tamtapir Posted: Wed, Apr 26 2017 9:31 AM

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Beomaster 3300. Sounds just fine on CD, PH and TP but hums low and steady at all the radio settings that can be done. No radio signal is received.
In addition, the sound "leaking", for example, from the source CD to the PH or TP or really which ever setting on the amplifier.

I have connected an original rabbit ears antenna, but the result is the same with or without the antenna.

On the back of the circuit board 3, there is a soot- or dust spot, as well as on a couple of components on the underlying board 2. But no components are burnt, not on any of the boards.

Where should I start searching, anyone have an idea?

Video showing the humming sound:
https://www.youtube.com/watch?v=n4zfu6ZcwOM

Some pics from underside of board 3 and board 2:

Thanks in advance,

/Di ck

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Dillen replied on Wed, Apr 26 2017 12:12 PM

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Check the 15V supply voltages to the tuner section (and the 16V from which it is derived.
Check C50 (100uF) in the tuner.

Replace the black and red Roederstein capacitors in the photo.
They may not have anything to do with the current problem, but they will eventually fail - particularly the black one.

Martin

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joerenfield replied on Fri, Mar 2 2018 6:59 AM

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Hello,

same problem here, any solutions? How can I check the capacitors? Or I just change them?

Thanks!

Josep