I don’t believe I’ve ever seen this before.
The drain and source legs of the power supply mosfets have been vaporized but the other side is completely undamaged. Drive signal looks perfect. The drive on the damaged side has a camel hump in the middle of the “on” duty cycle. Interesting.
Each side is running independent transformers.
This is a brand new amp that was installed in a customer’s car by a reputable audio shop.
What could cause this? Shorted transformer maybe? The audio shop said it played for a little while but it was really dragging down the whole system. I bet it was! When I arrived to check it out it would throw up a red LED with 3 blinks. That would be a drained battery. When I got it back to the shop the amp would power up with a blue LED with only B+ and Ground connected. Q10 is shorted. It is an 80v 1A PNP transistor. That may be why the amp powers up without remote turn on voltage.
David
The drain and source legs of the power supply mosfets have been vaporized but the other side is completely undamaged. Drive signal looks perfect. The drive on the damaged side has a camel hump in the middle of the “on” duty cycle. Interesting.
Each side is running independent transformers.
This is a brand new amp that was installed in a customer’s car by a reputable audio shop.
What could cause this? Shorted transformer maybe? The audio shop said it played for a little while but it was really dragging down the whole system. I bet it was! When I arrived to check it out it would throw up a red LED with 3 blinks. That would be a drained battery. When I got it back to the shop the amp would power up with a blue LED with only B+ and Ground connected. Q10 is shorted. It is an 80v 1A PNP transistor. That may be why the amp powers up without remote turn on voltage.
David