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Old 10th September 2004, 11:56 PM   #1
chewy04 is offline chewy04  United States
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Default Sparks from amp

I recently installed a Hifonics Bx1000d amplifier. About 5 seconds after the amp turned on there were sparks comng from it. The fuse at the battery blew but not the one on the amp. I opened up the amp to see what was broke and it appears that 3 of the MOSFETs are fried. Does anyone know what would cause this to happen and why the amp fuse did not blow?
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Old 12th September 2004, 04:22 AM   #2
djQUAN is offline djQUAN  Philippines
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did you get your amp brand new or second hand?
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Old 12th September 2004, 01:37 PM   #3
chewy04 is offline chewy04  United States
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I got it second hand.
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Old 12th September 2004, 03:01 PM   #4
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Maybe somebody replaced the amp fuse with too high a value, or the battery fuse is lower than the amp fuse value..

As for the fault, it's difficult to say. Best thing is to look where on the board may have got burned. Could be power supply or output stage.
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Old 12th September 2004, 06:46 PM   #5
chewy04 is offline chewy04  United States
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I know that 3 of the MOSFETs are burned...that appears to be the only damage. I have replacements parts coming. Im hoping that replacing those will fix it.
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Old 13th September 2004, 12:54 AM   #6
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Quote:
Originally posted by chewy04
I know that 3 of the MOSFETs are burned...that appears to be the only damage. I have replacements parts coming. Im hoping that replacing those will fix it.

I don't mean to discourage but there's probably a real reason why they blew up, but maybe not.
Did the amp appear to have gotten wet ever?
Good luck, let us know how it goes.
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Old 13th September 2004, 12:38 PM   #7
djQUAN is offline djQUAN  Philippines
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to save you probably lots of money, before installing the new switching mosfets (assuming the mosfets are used in the primary side of the SMPS) run the amp without them, then check the oscillator with an oscilloscope to see if it is still in good condition.
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Old 14th September 2004, 02:49 AM   #8
chewy04 is offline chewy04  United States
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Thanks for the help guys. I will post an update after I replace the MOSFETs.
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Old 27th September 2004, 09:06 PM   #9
chewy04 is offline chewy04  United States
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Well, I replaced the MOSFETs and reinstalled the amp and it happened again...3 seconds of power and then the MOSFETs blew. I know my wiring is correct because I have a different amp installed and it is working fine. I do not think there is much more I can do myself so I will probably have to send it out to be repaired.
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Old 28th September 2004, 03:22 AM   #10
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it was probably the controller that forced the mosfets to remian on...thus creating a huge current flow and blowing it up...you should've checked the driver portion BEFORE deciding a replacement was necessary...
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