Hi @picasso ,
It may be a loose connection or a faulty power socket.
Here’s a link to a not very good video that shows how to disassemble the speaker so that access to the interior components is possible.
Once you have access you can inspect the power socket connection to determine what the problem is, i.e. whether it is a loose connection or if the socket itself is faulty (you may have to use an Ohmmeter to prove this) and needs to be replaced.
Here’s a link to just one supplier of replacement sockets.
If the socket is the problem, as I do not know the specifications of the socket, you may have to search further for the correct type if the link doesn’t show the correct one. Be aware that these sockets are very close in diameter, being 2.1mm and 2.5mm, so this makes it awkward when trying to obtain the correct part.
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