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There is no adjustment to control the brightness in korg pa50/sd.
It is hardware problem.
-Is the white backlight that is too high?
-normal backlight,but words is too dim?
Both of that case,can be caused by damage / change of voltage control for lcd. Perhaps there are parts that are damaged or have changed in value. Typically capacitors etc.
If the backlight is too bright, then the damage is in backlight controller, may transistor or an inverter transformer.
Proceed with the repairs to the experts.
Ok, i see your problem. Take a business card and wipe the corners of your screen gently. This should work as unresponsive screes occur when dust is trapped on the screen.Remember, practice this every 3 months.Good Luck :)
The Korg Triton touchscreen has two main parts - The LCD screen and the touch overlay. Between the two is a type of gasket. It is really just an adhesive, but it does help keep out moisture and dust. If you were to remove the screen, you could separate the two parts, clean it and use double-face tape or glue to reattach. You can also get a replacement LCD screen, touch overlay or touch-LCD assembly from a number of places on the internet. They are not cheap, unless you purchase a generic touch overlay or LCD and retrofit. As for repair in your area... try contacting Korg at http://www.korg.com and look for authorized repair centers.