Sparks from amp

chewy04 · 10th September 2004, 11:56 PM

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?

djQUAN · 12th September 2004, 04:22 AM

did you get your amp brand new or second hand?

chewy04 · 12th September 2004, 01:37 PM

I got it second hand.

richie00boy · 12th September 2004, 03:01 PM

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.

chewy04 · 12th September 2004, 06:46 PM

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.

raidfibre · 13th September 2004, 12:54 AM

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.

djQUAN · 13th September 2004, 12:38 PM

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.

chewy04 · 14th September 2004, 02:49 AM

Thanks for the help guys. I will post an update after I replace the MOSFETs.

chewy04 · 27th September 2004, 09:06 PM

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.

li_gangyi · 28th September 2004, 03:22 AM

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...

10th September 2004, 11:56 PM	#1
chewy04 diyAudio Member Join Date: Sep 2004 Location: NY	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?

28th September 2004, 03:22 AM	#10
li_gangyi diyAudio Member Join Date: Jun 2003 Location: Woodlands Circle	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... __________________ Kids in the back seat cause accidents...Accidents in the back seat cause kids...

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12th September 2004, 04:22 AM	#2
djQUAN diyAudio Member Join Date: May 2004 Location: manila	did you get your amp brand new or second hand?

12th September 2004, 01:37 PM	#3
chewy04 diyAudio Member Join Date: Sep 2004 Location: NY	I got it second hand.

12th September 2004, 03:01 PM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	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.

12th September 2004, 06:46 PM	#5
chewy04 diyAudio Member Join Date: Sep 2004 Location: NY	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.

13th September 2004, 12:38 PM	#7
djQUAN diyAudio Member Join Date: May 2004 Location: manila	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.

14th September 2004, 02:49 AM	#8
chewy04 diyAudio Member Join Date: Sep 2004 Location: NY	Thanks for the help guys. I will post an update after I replace the MOSFETs.

27th September 2004, 09:06 PM	#9
chewy04 diyAudio Member Join Date: Sep 2004 Location: NY	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.