Hifonics BXi2006d not coming out of protect. Any advice?

[RRR37 10+ year member]

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

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[grandam888 10+ year member]

i would take a trip to diyaudio.com. there are a few people there that now ALOT about amplifier repair. At this point your looking @ repairing it, so it would be wise to have at least a decent soldering iron, good solder and desoldering braid and A Digital Muti-meter on hand. If you don't have a DMM try to pick up a Good used fluke DMM.

 

[RRR37 10+ year member]

Thanks for the advice. I will try DIY.

 

[keep_hope_alive Premium Member]

You really need a service manual and an oscilloscope to diagnose amplifiers, so you can trace the audio signal.

 

[ampjunkielikeme 10+ year member]

it is in protection because it probably has some shorted output transistors. either in the output section, or the power supply.

where did you replace the burnt resistor?

don't keep powering the amp up over and over again. it could come out of protection and let out all the magic smoke...lol

if you have a digital multimeter. switch it to diode check and probe the legs of the outputs and the power supply transistors to see if any of them are shorted together..if you get a constant beep from the dmm, you have a problem...

 

[RRR37 10+ year member]

The burnt resistor was replaced on my Bxi1606d which is working fine at the moment. The Bxi2006d is the one in protect. I will try the multimeter to see if there are any shorts I can find. I wish I had the proper equipment but I don't at the moment and it's not cheap. I do have access to this equipment when I start back up in school on July 1st and might get the electronics instructor to give me a hand. Was just hoping I did not have to go that route and wait that long. Thanks for the help, I will report back if I find something.