I have an MTX 81000D unit that the power supply FETs burned so badly, that it actually melted the aluminum clamps into a ball of metal, and dripped between capacitors forming an hourglass shape.
So when these MOSFETs go, they can go....
So when these MOSFETs go, they can go....
Wow, thats some extreme heat. That come from something you had in for repair? Would being properly fused limit the amount of meltdown when something goes that wrong?
And Perry, you are correct. I was talking about the attached photo for the the transistor that was running a bit warmer than I expected it to be when I was feeling for anything getting hot while the amp was powered up for about an hour.
And Perry, you are correct. I was talking about the attached photo for the the transistor that was running a bit warmer than I expected it to be when I was feeling for anything getting hot while the amp was powered up for about an hour.
Sometimes the fuse makes no difference, especially for large amplifiers. When you see something like this, an arc (like a welding arc) forms and grows. When it does, it melts everything it envelops until the arc is broken. It happened in an amp that is made with only a plastic cover and the arc got large enough to burn through the cover and burn the interior of the trunk of one vehicle.
I don't know. A friend of mine sent me the photos. The owner didn't want to try to repair it. Sometimes the heat only does significant damage to the clamps and damage to the board is minimal. Other times the board looks like charcoal and it's not practical to repair the amp.
I'm thinking something is wrong with the small yellow transformer or the driver for it. For kicks I measured some dc voltages from it and the one from the good amp while powered up. The center pin towards the heat sink on the working amp shows a 9.62 volt dc reading while the same pin on the non working amp shows 0. The rest of the pins are similar as far a dc readings go.
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