Motif ES7 Yamaha Display warmup

My Yamaha Motif ES7 display lights bright green when powered on but it is blank until it warms up for some time. I turned the contrast all of the way up with little to no help. When it warms up over 10-15 minutes it is usable. However, It is slowly getting worse. The black font on the screen is extremely faded until warmup.
Except for the display the board functions as normal.
I recently purchased and replaced the LCD assembly without the piggyback power board. brand new in a factory box. It did not solve my issue. For sure, the display works better as it heats up. Can anybody tell me if they have experienced this problem before? Should I replace the piggyback board mounted to the LCD or maybe a power supply?