Probably the power entry connector, unplug the electrical adaptor, if this doesn't work, try to lift up the small ground plate in the bottom of the piano connector to make sure it touches the ground wire in the back (ground from the battery that should connect only when the electrical adaptor is unplugged). Hope this helps, it did for mine!can you help me or give me some advice for my yamaha np-31 the problem is it didnt turning on even if i use a battery
Yikes... damn right, sorry i missed the word "even" lolHe said it won't run on battery either...
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