Yamaha psr gx76 keyboard faulty

[Jason pike]

Hi I used the wrong polarity on my Yamaha psr gx76 the keyboard turns on the screen lights up but no characters on the screen or sound ,would it be a similar scenario on my keyboard ?

 

[Les Jones]

I suggest that you start a new thread as your problem has nothing to do with the problem on this thread. Start by posting a full schematic of your unit.

Les.