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Is the unit responding to remote instruction at all? It does sound like your board is gone. This is usually a capacitor (blue or green and round flat disc) on the pc board, and possibly one of the diodes (small black cylindrical shape with a white line on one side) Often it is the compressor drive relay (rectangular black box) on pc board. If however you have managed to find a replacement board. The plastic heads holding the pc board are released by using a small long nose pliers and pinching the bit sticking through the board. The rest is simply a matter of changing one wire at a time from old board to new board. Or a good method is just to take a snapshot with a camera to refer to regarding the wire positions.
Heya, I am an ex warrenty agent for Hitachi in Western Australia and I will be able to take you through some tests if you want. But from the sounds of it I think that you will be up for a new indoor PCB as these are the most common things to go when there are power failures. If you would like me to go through it with you let me know. But first where abouts are you in Australia?