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Hi, tnx for your answer. No, this is not on the high voltage side, but on the 48 V battery side. I also measured this strange rectangular signal coming from the NSi6602 dual channel MOSFET gate driver chip. The input signal to this chip is ok (but with much noise...) Was such behavior seen before? What can be done to get the rectangle right? regards

Hi Powerforum and @BritishRacingGreen, thanks for this repair thread and all the useful information. I also had to repair an MKSIV inverter and replaced eight MOSFETs and some of the 22 ohm resistors. Now the inverter is working again, but not fully. The second MOSFET string, which was most damaged, have a strange rectangle switching signal, see attached picture. Does anyone know where this behavior is coming from? Which issue or faulty component cause this? Thanks, regards and vy73 Hans