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Old 6th December 2012, 04:59 AM   #1
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Default Hifonics Brutus BXi1208D

Hello recieved this amp for repair, it powers up and does not draw any current and seems stable. It will produce audio for a few seconds then goes into protect.

I checked the output terminals for for DC and the amp starts at 0 vdc when first powered, the DC steadily rises to -3.578 vdc then the protect kicks in, then the DC slowly discharges back to 0 vdc.

One of the rail caps was a little swollen but had not vented, they are 4700uf 63v and all I have is 4700uf 80v. I replaced the one as you will notice in the pics, should I replace the other to match or does it matter?

Could this be the transistors on the audio board marked 1d and 2d as the culprit?

pic1: the board
pic2: audio driver board
pic3: pwm board
Attached Images
File Type: jpg Hifonics brutus BXi1208D 001.jpg (1.01 MB, 70 views)
File Type: jpg Hifonics brutus BXi1208D 002.jpg (986.0 KB, 62 views)
File Type: jpg Hifonics brutus BXi1208D 003.jpg (1,008.4 KB, 54 views)
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Old 6th December 2012, 05:45 AM   #2
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The caps don't have to match.

Yes. I'd expect the 2 1D transistors to be the fault.
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Old 6th December 2012, 06:08 AM   #3
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OK I changed them all going to re-install driver board.

That CHIPQUIK sure works amazing, thanks for the heads up on that.
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File Type: jpg Hifonics Audio Driver Board 001.jpg (994.7 KB, 52 views)
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Old 6th December 2012, 07:03 AM   #4
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Now the amp will not power on, there is no current draw but it drops my supply down to 5 vdc.
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Old 6th December 2012, 07:05 AM   #5
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Just a thought , static?
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Old 6th December 2012, 07:13 AM   #6
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I don't know how your supply works but none of mine will drop to that voltage unless they're loaded beyond their current rating.

Insert a low value current limiting resistor (2 ohm would be OK but a 1 ohm may be better) in the B+ line to see if it still draws the voltage down.
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Old 6th December 2012, 07:15 AM   #7
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I removed the new rail cap I installed and now the amp will power up? I think I put it in backwards by mistake. What a rookie move.

BRB
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Old 6th December 2012, 07:18 AM   #8
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It looks to have been in right, maybe it is shorted.
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Old 6th December 2012, 07:18 AM   #9
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Look at the silkscreen. The negative terminal will be marked. According to the cap orientation in similar amps, it looks right in the photo.
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Old 6th December 2012, 07:31 AM   #10
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I thought the grounds of the rail caps would be directly connected to each other. The only marking I see is a big arrow.

I hook power to the replacement cap out of the circuit and it charges and holds a charge.

If I install it in the same orientation as the other cap it wont power on.

Does the positive of one cap connect to the negative of the other?
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