Very, very bad design..... No heatsink at all. Old boards (bought 2 years before) needs revision too but they was much better. These new boards has even no copper under the chip..... It's just impossible to get even half power from this board, it will shut off or burn by overheat. Only way to fix it is to desolder chip, drill a hole in the board and solder copper wire core to heatsink pad directly..
thank you