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.
Testimonial: "THANK U VERY MUCH.......!"
YES.... THANK U VERY MUCH. IT IS A BACKLIGHT PROBLEM. THE CHARACTERS CAN BE SEEN WHEN A TORCH IS ILLUMINATED ON THE SCREEN.
It may be that the cable powering the backlight has come partially loose and the vibration makes it come and go. When opening the unit, be careful of the ribbon cables connecting between the two halves of the case.
Is it necessary to repair the backlight problem?
There is no danger of damage with the backlight like this, but it would sure be annoying. Try tapping the unit when it has faded and see if it re-connects... gentle tapping, not with a hammer or fist... do it with a knuckle for instance.
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Am Kwofie from Accra Ghana:
I recently bought a Yamaha PSR S700 keyboard and it stated developing problem. Anytime time i switch it on the power comes and go off and on leaven the screen light on in the fade mode without seeing anything on the screen nor hearing sound unless you switch it off and on it again, and when it comes immediately you start playing it will do the same thing, the power adapter too is good so what may be the cause thanks?.
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Is it necessary to repair the backlight problem?
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