I have a Hifonics Brutus amp that has a damaged power supply. The power supply uses IRF44n transistors, 47ohm gate resistors, and the drivers are A1275 and C3228. They were all bad burned so I replaced all gate resistors, and the drivers for the mosfets and checked the drive at the gate pads. I found some normal and abnormal drive waves. I have attached images of what I found. I’m not sure why I’m seeing the abnormal drive wave.
The first three gate pads on the right side have an abnormal drive wave and the last three on the right side have normal drive.
On the left side the first three gate pads have normal drive and the last three have an abnormal drive signal.
David
The first three gate pads on the right side have an abnormal drive wave and the last three on the right side have normal drive.
On the left side the first three gate pads have normal drive and the last three have an abnormal drive signal.
David
Attachments
Looks like 2 of the 4 banks has the issue. I would check again the driver transistors and the TL494.