How to Repair 1000W Sine Inverter

Today, I bought an old broken inverter. It is sine inverter 1000VA, voltage 12V. Could not start this inverter. I will try to recover it. If you have a similar inverter. Please comment, I will help you fix it.

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All my projects are free, I design them on EAGLE 6.0. I uploaded it to Google drive. You need to use a web browser to download the file and open the file with winrar software (extract) on the PC. Open schematic file (.SCH) and PCB file (.BRD) with EAGLE software.
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#Inverter
#12Vto220V
#Restoration