I'm also looking for a way to be able to reuse the speakers and amplifier of a Beovion Avant 32. For now I didn't have any succes to make it work. I already tried the following:
Service manual: link
Normal
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I have
the power supply (print 4), two amplifier unit with STK 4122II (print
10&11) and the speakers.
On print 4
I put directly the 230Vac on P46. P45 and P43 are disconnected. Flatcable on
P41 and P42 are cut. I only made a connection on P42 between pin 10 (8VSB) and
pin 2 (STBY/ON). Then I have +20V and -20V on P44.
Then I
connect the amplifier units (print 10, P58) to the power supply (print 4, P44).
On the amplifier unit (print 4) we then have the input on P57 (1=mute sound,
2=NC, 3=sound, 4=GND). Pin 2 and 4 I connect with GND on power supply (print 4,
P42).
When
connecting a sound input on amplifier (print 10, P57) between pin 3 and pin 4,
I don't get any sound out of the speakers.