Hifonics BXi2006d not coming out of protect. Any advice? - diyAudio
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Old 22nd May 2011, 06:15 PM   #1
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Default Hifonics BXi2006d not coming out of protect. Any advice?

I just got a Hifonics BXi2006d from someone who quit the car audio hobby a while ago and I'm trying to get it going on some L7's but the amp is stuck in protect mode. I don't have speakers hooked up to it yet so I know there is no wires crossed there. I have a hifonics bxi1606d running now just fine so I know the RCA's and power/ground are good. Big 3 is done, all pure copper flex 1/0 pos and neg front to back running stock 130A alt, stock batt and one yellow top. I looked at the guts and cannot find anything that looks like a problem. The Guy did tell me that long ago a cap blew and was replaced but the amp worked fine after that until now. Last time I had a problem with my 1606d I cracked it open, found a burnt resistor and replaced it, that was it. Not sure which direction to go with this one. These amps do not have fuses so its just an in line 150a fuse protecting the amp. Any advice or experience shared would be much appreciated. Thanks

Not sure how to move this but in needs to be in the car audio section. Sorry for the noob move.
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Last edited by RRR37; 22nd May 2011 at 06:35 PM. Reason: Need to move to car audio forum
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Old 23rd May 2011, 10:00 PM   #2
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Have you checked the output transistors ?

If any have gone they sometimes take the class d chip with them.
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Old 4th July 2011, 09:22 PM   #3
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I have finally found time to get into this thing after reading some info and watching a little DIY video. The parts I found to be showing no resistance were the MOSPEC U16C20A x2, and MOSPEC U16C20C x2. I have removed these and powered up the amp to test. It does come out of protect with these removed. I have found a supply house (Newark-Element 14)online that will charge about $6 for the four parts, $20 handling, and $5 shipping.
Can anyone tell me if there is a better/cheaper supply house? Also, is there anything else I need to check on the amp other than the fets all around? I don't know much yet but trying to learn and make sure I do it right.
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Old 4th July 2011, 09:32 PM   #4
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post this in the car audio subforum. the mospec chips you took out are the diodes. without them the rest of the amp has no power. so if it comes out of protect with the diodes removed then you probably have an issue in the output section. One of the fets threre are probably shorted internally.
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Old 4th July 2011, 09:53 PM   #5
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Thanks JLT. I tried testing all of the output transistors and did not see anything that was showing low or no resistance. Are the diodes supposed to show 0 resistance? They looked bad in appearance too so I figured they were the problem. I made a mistake originally posting here and did not want to start a new thread and make it worse but it looks like that is what I should do in the proper section, sorry for the mistake.
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Old 6th July 2011, 03:28 AM   #6
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diodes will read 0ohm with a DMM in one direction; if they're reading 0 in both thats bad; UNLESS something else in the curciut is messing with the readings; its hard to test fets and diodes in the amp; you really need to remove them to really test them
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Old 6th July 2011, 03:32 AM   #7
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I'm gonna work on learning a lot more before I mess with this again. I'm an idiot for even trying at this point. I see there are many places to learn and I need to soak up a lot more knowledge from them and come back to this prepared. Thanks again for the help.
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Old 6th July 2011, 03:35 AM   #8
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very good idea! best of luck
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