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You may need to perform a factory reset operation. Turn power off, hold down the DEMO button and turn the keyboard back on. The
screen should display 'Setup is initialising'. This will disappear after a few seconds and the screen will display its default. If that does not work you may need to re-install program disks, I think you should have 6 of them
There is a video cord that runs from the motherboard to the screen it may be loose and needs to be re-seated back in place, or the problem is in the display itself which would be the worse scenario and would require a full screen replacement.
Try attaching an external monitor to the laptop & see if you could get any display on it. If this is successful, then you might have either a faulty LCD cable or screen inverter board. The
LCD cable transfers data signal from the motherboard & video card
to the LCD screen. It also supplies high voltage DC power to the screen
inverter board. The screen inverter board works as a power supply for
the backlight lamp mounted inside the LCD screen. It converts low
voltage DC power to high voltage AC power needed for the backlight lamp
I have the same problem, mine is Yamaha YPG-625. This seems to be a common problem with Yamaha keyboards. I opened the 100 screws in the back, separated the main board from the display unit which is under it if you flip the keyboard upside down, to verify if there was any loose wires, nothing of the sort.
It is so frustrating, the keyboard is working fine but it is hard to navigate because the display is not functioning. Yamaha should do a recall as this is obviously something wrong with the keyboard happenning to a lot of people
The backlight is either disconneted or has burned out. I would remove the keyboard and molding and replug the display cable. I think it probably just wiggled loose. Just be careful when you remove the molding so nothing gets broken.
If the screen still is not lighting up then you may have to send the laptop in for repair or replace the LCD yourself.