I have a blown mtx 500 watt d class amp, and my friend has an expensive rockford 500 watt 2 channel amp. I tried repairing both of these amps, replacing all 8 transistors in my d class, 7 of which were blown, and replacing 4 transistors in the rockford amp, all 4 of those being melted and obviously blown. Well, I wasn't expecting to make the amps work, but I was hoping, but my hopes were dashed, haha. My D class amp didn't turn on the LED's, so it's still a ways from being repaired. My friend's rockford amp tried to turn on, but didn't work properly, it was just pulsing the speaker a lil bit, then I noticed a lil smoke coming from the 4 power supply transistors I had replaced, so i quickly unhooked the power. I guess the power supply on the rockford amp is blown and is overpowering those transistors causing them to smoke and fry? Do I need to replace the large capacitors? I want to unsolder the large capacitors, and test them to see if they're any good. I figured out how to test transistors, which was a cool skill to learn, and that is how i figured out that 7 of the 8 transistors in my D class amp were blown. But I still got a lot to learn.
years ago i had dreams of aquiring an electrical engineering degree so that I could make a career designing amplifiers for car audio and home theatre manufacturing companies. Well I dropped out of college and am pursuing other career dreams. But I still want to learn how to repair these far too easy to break amplifiers.