royabdo

Hello, I have gone through this manual which you have shared and the inverter which I am repairing is exactly the same, I am attaching an image from the same tutorial, and I have marked a part which is of green colour which is totally blown out, I think may be the error 57 is because of it, and can you tell me what is it?
New Bitmap image.bmp

Ah. I'd say that's D40 on this schematic:

HFPW+ (High Frequency PoWer +) is a square(ish) wave power connection from the main power supply. Rectifying and filtering it produces +12 V. The main power supply is a flyback design; these are intended to provide power in only one "stroke". The "intake stroke" ("induction stroke"?) fluxes the multi-winding inductor; during the "power stroke", the inductor de-fluxes and pushes current into the loads. D20/D40 is intended to ensure that power only flows during that "power stroke".
TX7 provides isolated power for the IGBT drivers: the two high-side full-bridge IGBTs, and the third drives the three BUS- referenced transistors: two low-side full-bridge transistors, and the buck transistor. Each winding provides ≈+15 V and -5.6 V for the gate driver output side.