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Old 22nd December 2009, 02:43 AM   #1
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Default Hifonics brutus bx1500d

When trying to power this amp up it draws 40+ amps of current. I took the outputs out of the amp and tryed it again still draws 40+ amps.

I checked the fets all test good but looks like someone messed with them .

The fets that are in this amp right now are FQP65N06 with 100 ohm gate resistors.

Wondering what to check next since this thing is drawing way to much current
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Old 22nd December 2009, 02:57 AM   #2
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While powering it up through a limiting resistor, try twisting/pushing/pulling on the transformer to see if the current draw changes.

Does it only draw excessive current after applying remote voltage?

Is it possible that the FETs were replaced? If so, check the driver transistors and the gate resistors.
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Old 22nd December 2009, 03:15 AM   #3
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It only draws 40+ amps when remote is hooked up .
Tryed powering it up with a current limiting resistor and twisting pulling on the transformers nothing changes.

Its possible they were switched (fets) looks like new solder on all of the fets.

checked all gate resistors all check fine also checked the drivers a1266 they also check fine but dont have any to stick in there to see if one is leaking

Also i found a diode in the output side thats bad it says P6KE68A wondering what i can replace it with.

and i think the guy said he smoked one of the IC'S but he didnt know which one

wondering where i go from here
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Old 22nd December 2009, 03:37 AM   #4
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The P6KE68A is used to protect the 4080 from over-voltage. You need to replace it with the same part.

Pull the 4080 and power up the amp. Does it still draw excessive current?

If so, pull the rectifiers to see if the excessive current draw remains.

You can check the driver transistors to determine if they're leaking, shorted, open or OK.
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Old 22nd December 2009, 03:43 AM   #5
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ok with the 4080 removed it powers up fine doesnt draw excessive current.
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Old 22nd December 2009, 06:39 PM   #6
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the outputs in this amp 2 are blown also they read ir 425h wondering what the part number is??
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Old 22nd December 2009, 06:56 PM   #7
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There should be other numbers also. Wipe some of the heatsink compound onto the face of the transistor and then wipe off as much as possible. That should make it easier to read the numbers.
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Old 22nd December 2009, 07:04 PM   #8
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all the numbers on the fet read 94-2355 I R 425H fc 3a
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Old 22nd December 2009, 07:37 PM   #9
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From what I found via google, they are likely IRF3710s.
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Old 8th January 2010, 01:53 AM   #10
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ok replaced the hip4080 and the diode with no outputs in the amp it idles around 15 amp with the hip 4080 removed it idles at 2 amps wondering what to check next
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