Question about Yamaha DGX 640 Keyboard Arranger
Switching on and off
If you haven't already, try to adjust the LCD Contrast by rotating the knob on the rear of the keyboard. If that doesn't help and if every thing else functions the Contrast pot is damaged or the LCD needs to be replaced. Those would be the most likely causes.
Posted on Dec 12, 2014
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Posted on Jan 02, 2017
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