Help repairing Hifonics Brutus BRZ1200.1D - diyAudio
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Old 29th November 2012, 09:15 PM   #1
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Default Help repairing Hifonics Brutus BRZ1200.1D

Hey man , I kniw its a little old of a Post, but a Friends' amp aparently gave smoke and now is not working, but it turns on, with the blue lettering. I want to take a look at it to see if I can repair it, if its to change a mosfet and solder new ones, what do I have to look for ?? Black burnt colors ? And where is most commonly burn or damage areas? Smolten lead connections ?
Thnks Ian.
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Old 30th November 2012, 06:01 AM   #2
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You need to read the entire basic repair page (link in sig line below). Even read the parts that you feel ire irrelevant.

Have you removed the cover yet?

Do you have a multimeter?
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Old 30th November 2012, 06:06 AM   #3
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Hi Perry, well I have not yet done anything, as it's my friends, but I will be going home for Xmass vacation and I will work on it, I wanted to read up and around in forums. Thanks a lot for the links in ur signature line I have already started reading it
By the 14th I'll going home so I will hit you up on this forum, thnks a lot
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Old 30th November 2012, 06:27 AM   #4
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You'll need a meter to help in troubleshooting.

If it smoked, the power supply FETs are likely what failed. That means that there will likely be at least a few defective gate resistors and possibly blown driver transistors.

The supply could have failed on its own but may have failed due to shorted output transistors.
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Old 17th December 2012, 05:07 PM   #5
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hey there Perry ,

welll finally got home and took a look at the amp, and well right off the batt i can see a few burnt resistors right below I believe the output transistors( they are ear the speaker hook up hub) on both sides of the amp. will be gettin a multimeter later to test the fets.
is there somewhere i can get a schematic to see what size resisters i shout get to replace these? because they are burnt away and can read the color bands ... :S

thanks Perry
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Old 17th December 2012, 06:07 PM   #6
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Generally, the FETs near the power/ground/speaker terminals on hifonics amp are for the power supply.

There are a lot of parallel FETs so you should be able to read the value of enough of them to know what the rest should be. You'll need to remove the failed FETs before you can measure any of the resistor values. Cleaning them with alcohol or acetone will help read those that are just covered with soot and not actually burned.

If any of the FETs in the power supply have failed, it's likely that all of the FETs in the supply have failed. Even if only a few failed, you will need to replace all power supply FETs.
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Old 17th December 2012, 06:53 PM   #7
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well these resistor are kinda burnt throught their surface, the white ceramic like material is showing and they are away from the other resistors, the other ones which are not burnt on the other FETS are two next to each other so I cannot know if they are the same resistance of on or the other... but If you have a shcematic can u look it up for me? the burnt resistors are R32, R34, R48, R46, R47 to the other side R37,R36, R43, R42, R44
and of a visual inspection I can see damage on the legs of the FET# Q12 right above R36
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
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Old 17th December 2012, 07:06 PM   #8
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They were likely 47 ohm resistors but could have been 22 ohms. After removing the FETs, check all of them. If you find several that read near 47 ohms, that's likely the correct value.

Have you tried contacting hifonics to see if they could tell you what the original value was?
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Old 17th December 2012, 07:12 PM   #9
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no I have not contacted them, didn't know it was possible.. where should I try? costumer support?
so if im correct, my next step is to remove the FETs and then check the resistance of the burnt resistors, plus check the FETs (although I should treplace all the FET correct? ) Correct?
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Old 17th December 2012, 07:18 PM   #10
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I don't know. I've never contacted them.

If the resistors are burned, the FETs have failed.
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