I think the back piece of the keyboard where power wire goes into might be broken, i've to hold the wire in a certain direction in the back of the keyboard before power comes on, how is this fixed?
Music - HQRP - AC Adapter / Power Supply for Yamaha DGX-620 / DGX620 /...
Answers & Comments
The connector or the soldering to the circuit board has failed. Replace or resolder the connector.