I would suggest to check AC outlet first where adaptor is pluged in,if Ok measure output voltage from adaptor to see if there is any (using any voltage multimeter with AC/DC)
Check label on adaptor shold be writen AC or DC output ,and value 3V,6,9,12,24,48 etc...
If adaptor is ok then problem is power jack mounted in to the speaker (cold solder joints' or damage)
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