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i'm out of any other ideea and technobit is not replying to my mails i consider myself screwed up. For 70 technobit failed i wonder if this amount worth so much to loose a possible customer, i guess yes.
Does the Board may have a bypass?
In the photo it looks like this.
By the right power connector, 3rd row of chips from the bottom, 2.chip(Power-FET) from the right side.
It looks like 2 pins (first and second from the right side) was bridged.
But also can be, that this is the side for cooling the chip (Power-FET) , then the bridge would be correct.
Compare this please by look at the other board , on my board I can't find any labels of the components.
I would ask you to send back the board , you have 1-year warranty.