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Solar inverter repair - rebooting problem

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Hello everyone!

I have a hybrid MPPT solar inverter (5KVA) with an incoming grid of 220V.

I fixed an issue with the inverter not turning on. However, after doing this, as soon as I connect the AC-IN wiring when trying to re-install, the inverter will reboot itself repeatedly, never turning on completely. (I apologize for not having taken a video, I was so frustrated!).

The fans will seem to start, but then turn off, and then again begin the process this way. The display shows the batteries statuses (almost full) and the AC IN voltage at 232V. That is, for a less than a second, the inverter will show its whole screen as if everything was in working condition, even attempting to turn on the fans, but it will never come up properly.

The LED lights show green-green-red, meaning that batteries and the AC are ok, but the inverter is faulty. These lights are not blinking, but stable.

So far, changed several of the components near the MOSFETS, including two safety capacitors and the smallish electrolytic ones, as well, but nothing has solved the issue. I also changed all of the PNP A1020 transistors

Does anyone have any ideas about where to look? Could it be one the huge capacitors? They appear to be working when tested with the multimeter and they don't seem visually damaged.

Thank you greatly!

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