Make sure you have the CORRECT adapter for the unit. It should say Yamaha on it and match the voltage and polarity. Thest the output with a meter. Common problems that happen to the piano itself causing the symptoms is a broken power connector or broken solder at the connector. Use a meter and verify the adapter is producing output. Expect the output to be a bot higher than listed when not plugged into the piano as there is no load on the adapter.
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