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Old 24th December 2014, 03:49 AM   #1
prls is offline prls  United States
diyAudio Member
Join Date: Oct 2014
Default hifonics protect issue

working on hifonics bxi2010d that was stuck in protect mode. I check the output transistors and there good. I remove the driver board and it came out of protect. I then removed and replace the MMbta42 transistor that are the ones that go bad and used mmbt3904 marked 1a instead of 1d. when the car is off 12.4 volts it works perfect but as soon as I turn the car on it goes into protect. I remove rca and speaker wires just power going to it and if car is on it goes straight to protect , if I turn the car off the amp works fine. could me replacing the mmbta42 with mmbt3904 be the issue here.
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Old 24th December 2014, 10:54 AM   #2
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Join Date: Jun 2010
Class D you should used the originals.
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Old 24th December 2014, 01:54 PM   #3
diyAudio Member
Join Date: Nov 2003
Location: Louisiana
The voltage is likely causing the 3904 to break down. When the engine is running, the breakdown is more likely if the rail voltage in the amp is unregulated.
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