Hifonics Brutus BXi1100D mk2 no audio - diyAudio
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Old 25th January 2012, 06:40 PM   #1
Mote is offline Mote  Estonia
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Default Hifonics Brutus BXi1100D mk2 no audio

I still have very little experience with class D amps so I will rather ask what to do than blow this amp doing something stupid.
Amp draws about 2,3A of current which I suppose is normal considering the LED show on the heatsink and amplifier size.
There is no DC voltage between speaker terminals, no increased current draw when speaker is connected. I think that is because the relay does not click .
Voltage between GND and speaker + is 33V I do not know if that is normal.
Relay is SLA-12VDC-SL-A.
Pinout can be found here:
Buy relay, T90, PCB relay, 25pcs DC12V Electrical Mini PCB Type Power Relay SLA-12VDC-SL-A (T90) 5pin at Aliexpress.com
Coil pins are on left top and bottom one? On those pins amp has 11V, so relay can not function?
Amps Protection LED is not lighted, only Power LED.
Transistors seem fine, no shorted ones when testing on board. Power supply FETs have 3,4V on their gates. Rail voltage is 42V and present on output transistors.

What to check next, waveforms and voltages on HIP4080?
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Old 25th January 2012, 07:04 PM   #2
timwebb is offline timwebb  United States
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U got a picture? Im thinking for the relay it could be a diode near it gone bad. And the hip4080 has most likely. Failed too.they always do. Also the output. Transistors will fail and not trip the protection. So check them out of circuit before buying a new ic and installing it.
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Old 26th January 2012, 12:27 AM   #3
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Do you see any audio on either speaker terminal (no speaker connected) when you drive signal into the amp?
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Old 26th January 2012, 04:52 PM   #4
Mote is offline Mote  Estonia
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Perry:
No audio on speaker terminals.

Timwebb:
Will post photos afterwards. Outputs seem OK, what voltages I should read on output transistors in a working amp?
In my amp I get 4 different results for 8 transistors:
1:37
2:48
3:34

1:1
2:34
3:-0,3

1:15
2:45
3:11

1:7
2:12
3:0,3

Only diode which I see near relay is one of RP diodes, connected between GND and B+.
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Old 26th January 2012, 05:00 PM   #5
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What DC voltage to you have on pins 5, 6 and 7 of the 4080?
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Old 26th January 2012, 05:16 PM   #6
Mote is offline Mote  Estonia
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5: 2,6
6: 10,2
7: 11,7
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Old 26th January 2012, 05:24 PM   #7
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If it has a ZD1, it's defective. It's a 6.2v Zener.
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Old 26th January 2012, 05:53 PM   #8
Mote is offline Mote  Estonia
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It has DZ1, 1N4744A 15V Zener, appears to be in working order, has 15V across its terminals.
Near 4080 there is a DZ3 with 7V across its legs.
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Old 26th January 2012, 05:56 PM   #9
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In other 4080 based amps, the Zener is used to bias the audio to about 6v. That will show up on pins 6 and 7. The Zeners often fail and allow the voltage to go significantly higher. When you post a photo of the area around the 4080, I may be able to offer more specific suggestions.
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Old 26th January 2012, 06:37 PM   #10
Mote is offline Mote  Estonia
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Here you go.
Attached Images
File Type: jpg P1260008.JPG (689.8 KB, 134 views)
File Type: jpg P1260010.JPG (639.0 KB, 124 views)
File Type: jpg P1260014.JPG (509.2 KB, 118 views)
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