I have a Diamond Audio D7401 Mono amp that goes into protection mode with only power/ground/remote applied. I understand the problem is most likely a blown fet in the output stage. I have done allot of reading about repairing (Amplifier Repair Tutorial from Perry Babin) but just can't get past a mental block. I am fairly knowledgeable about electronics and could really use some help in defining the specific FETs I should be testing. I DO have the schematic for this amp to help see attached. I beleive the FETs I need to focus on are Q59 -Q65 and/or Q9 - Q15. I truly appreciate any help that can be provided.
Be careful those devices are in parallel and they will all try to read the same values, and that might confuse you even more. May I suggest that you take a soldering iron and lift the center lead of each device and test from that lifted lead to either side, on each and every device. < only on the groups that read very low ohms across each other, like shorted condition > This will lift that lead out of circuit and give you a chance to read each transistor independently of the array...
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