Disassemble fx4021 subwoofer - Altec Lansing FX4021 Computer Speakers

Service manual is available for free from https://www.manualslib.com it contains disassembly instructions. If you change the fuse and it blows again, then your amp will need service.

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If it came actively powered and permanently connected but you do not want to use the supplied amplifier, then you need to disassemble the subwoofer cabinet and disconnect the amplifier from the driver.

start at the basics, check home circut breaker box, ensure it is still plugged in, check the fuse subwoofer itself. unplug and disassemble, to ensure no moisture or a fried bug is the sorce of the problem, ensure the leads to the subwoofer havent popped off or become crossed, etc etc. hope this helps

Most likely what got burnt is the bridge rectifier in the power supply section of the electronic circuit. This usually takes the shape of either a single 4-legged IC, or a group of 4 rectifying diodes connected in a bridge configuration. If you disassemble the unit to which the power cord is attached & trace the circuit starting from the terminals of the power chord, you can easily identify it. You will need to replace the 4-legged IC or the 4 rectifying diodes.
You will also need to replace the fuse, since it is usually likely that it gets burnt if the unit is attached to 220V instead of 110V.

Check for a Fuse. Mine is an older model and has a Fuse right next to the power cord. It probably has a slot for a flathead screwdriver.

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Thanks Good Luck
Appreciate to rate as "Fixya"

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