The piano came on a few seconds and silently turned off. It won't turn on now with a 110/220 transformer.
Your only hope is that a fuse was fitted to the power supply board inside, and that this has blown. As Bill said, have a tech look at it.
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Probably find that the board is cooked from the over voltage
have it inspected in an electronic appliance repair shop and get a quote but I would expect that the unit is now junk
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