A while back I did a backlight mod on my Yamaha QY300 sequencer.
I upgraded the LCD to the ERM24064SYG-1 by EastRising Technology. It has a yellow-green background with 240x64 pixels. Its RA6963 controller is fully compatible with T6963 used in the original QY300 display.
The only real issue was a change in sensitivity of the contrast knob. The useful range became much smaller. I added a resistor to compensate for this. I don't remember more details about the install - hope the pictures are still useful!
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