One of the speakers will turn on for a second, then blow the fuse. this has happened three times after it blew initally. these speakers are about ten years old. i dont know much about electrical/speaker repair but the speaker "as is" is completely useless to me so im not afraid to get my hands dirty.
thanks in advance
Sounds like a short circuit or a defect inside the circuitry that is allowing more power to flow through, thus blowing the fuse. My advice would be to dispose of these speakers for safety reasons and invest in a good quality set.
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Fuses blow due to an overload. What has happened in you case is one or more of the output devices (found on the big heat sink) has shorted and acting like it was a piece of wire. Now you have to find out which. By the way it might have gone due to bad speaker wires or speakers, or speaker wires touching each other.
Fuses blow when there is an overload. In your case when you crossed the speaker wires you shorted the main amp. This now has a part that is acting just like a strand of wire.
Trace back the channel you crossed the wires and find the main output device(s). Then replace them. They will be located on a heat sink if that helps.
Maybe. There should be a fuse. It will prolly look like a black knob on the back of the sub. Unscrew it and check the fuse. Replace it with a good fuse. If it keeps blowing the fuse, the problem is likely in the speaker. If the problem is inside the sub, you may need to repair/ replace the circuit board inside the unit. If you can't get one you will have to replace the speaker as it will keep blowing fuses.
Subwoofers draw a tremendous amount of power. With the amount of heat generated by amperage flow and the movement of the voice coil, you may have burned out the coil. Do a resistance check across the coil. Easy check? Temporarily attach another speaker to replace that one. Use LOW VOLUME and slowly work the vol up,and, if the fuse does not blow, it's the other speaker.
When fuses blow theres a problem, now how it blows help you find out where the problem is, If the fuse flashes and turns black the second you turn it on or plug it in there is a massive short in the power supply, If it blows but is clear the surge was not a dead short but a overload, Either way best to run it down to the shop and get it looked at
I had the same problem. The screws around the perimeter of the back plate must be unscrewed and the plate must be pried off as it is glued to the box. When replacing my fuse, 2A 5x20 GMA, it blew the fuse again. Disconnecting the second circuit board prevented the next fuse from blowing, but now the question is what is wrong with the circuit board? I cannot see any damage or shorts.
Go to Logitech support and check the faq's on your speakers. You must replace with the same fuse and it may be a 3amp slow blow fuse. If so replace with the same fuse or you will just keep blowing them out.