Hifonics Brutus Bxi 2006D in protect - Page 3 - diyAudio
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Old 2nd September 2012, 06:04 AM   #21
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Location: Florence, Alabama
there is a via on bottom side of board that is pulled? how would that make them read shorted? i can try to repair it with my conductive pen
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Old 2nd September 2012, 06:15 AM   #22
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Don't use a conductive pen. Use wire if necessary. Conductive pens are better suited for logic circuits.

Did you check the ones on the other side of the amp?

IF you have an open connection to the gate leg, the gates can charge and make the FETs appear to be shorted.

Did the short go away when you removed the FET?
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Old 2nd September 2012, 06:25 AM   #23
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pads do not read shorted with fets removed... the other side checks good across the board
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Old 4th September 2012, 05:44 AM   #24
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If there is no short with the FETs out of the board, it seems to indicate that the connection to the gate of the FETs is open (allowing the gates to remain charged and causing the FETs to appear shorted.

Reinstall them and do whatever you did to make them appear shorted. Confirm that they again appear shorted. Remove power from the amp and connect a jumper from the gate to the source leg of one of the FETs. Does that cause them to read OK in the board?

Don't apply power with the jumper in place.
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Old 6th September 2012, 01:34 AM   #25
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Ok got the protect issue solved , It seemed to be one of the vias, It will power up fine with green light but no audio is present when i put a signal on it, the outputs are new and checked good in circuit
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Old 6th September 2012, 02:25 AM   #26
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Are you getting audio to any of the pins of the driver board?

Do you have rail-rail oscillation on the output transistors?
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Old 7th September 2012, 12:28 AM   #27
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no audio at driver board,how do i check rail -rail oscillation?
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Old 7th September 2012, 12:54 AM   #28
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With an oscilloscope.
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Old 7th September 2012, 12:59 AM   #29
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yes which legs? on the outputs? i dont think im getting oscillation
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Old 7th September 2012, 01:51 AM   #30
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I think that there were at least two versions of this amp. I don't know which one you have. If it uses only IRF640s for the outputs, the oscillation will be on the center leg of half of the outputs and on the 1st and 3rd legs of the other half of the outputs.

Post a photo of the audio driver board in your amp.
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