Question about Yamaha DGX 640 Keyboard Arranger

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Screen is blanck can not see any of the database

Switching on and off

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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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I'VE A YAMAHA PSR S700. The problem is with it's screen. Whenever i start playing, the screen fades and then it comes and it goes and vice versa. This occurs almost two - three days a week. There...


Likely a connection to the backlight is being broken. Tap on the unoit and see if it pops back on. Illuminate screen with a flashlight and see if the characters can be seen when screen is faded. If they can, then the backlight is the problem... IF NOT then the display may be bad... This has been a problem and if you are under warranty, excersise it immediately... else replacement of the display is relatively expensive.

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