Behringer b212d Blowing Fuses
Hi there! I have a Behringer B212D powered speaker that keeps blowing fuses. I opened it up and see I have 2 MOSFETS that have blown up on the primary side of the switch mode power supply. I haven’t been able to locate any shorts on the primary side, but I hear that when the fets blow and the fuse blows, there are likely other parts that got taken out as well. I’ve checked all the resistors and capacitors and diodes and can’t find any parts that measure faulty or show a short. I’ve also used an ESR tester on all the electrolytics.
I read somewhere that when the fets blow, the IC that regulates the switching of the fets gets taken out as well. I’ve taken out the 2 blown up fets and was thinking of powering up the SMPS with a light bulb limiter to see if I could measure the voltage coming into the IC, but I read somewhere that you should replace both the IC and fet, because if you don’t, then whichever part you leave in will cause the other part to blow again. That is, if I replace the fets only and if the IC is blown, the IC will cause the new fets to blow.
So my question is, should I replace the IC and fets together? Can I try powering up the board without the fets and see if I’m getting voltage to the IC, or is it likely I’ll blow something else up? The schematic is for a B215D which is very close to the B212D I have. The main difference is it has a 15” speaker, where mine has a 12” speaker. Unfortunately the schematic came out blurry where the original is not. I’ll see what I can do to get it clearer. Thank you!
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