Hi,

This is my first attempt to repair a DEYE inverter. I fed with 50V battery voltage and pressed the button ON, however it is not turning ON, and I noticed the LEDs on control board flashed for milliseconds periodically (it seems like failing to start).

I found out some IGBTs are shorted out, so I had to replace them and their gate drivers. Now I have the startup issue only.

Can anyone advise where to start to check the possible reason for this failure?

You can find below the inverter board as a reference

Here is a video describing the behavior

I checked all regulators, SPS mosfet and driver and all are fine

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