Yamaha S70xs LED screen

Hi. My S70xs LED screen was getting too faded (no contrast) to read. So I replaced the LED screen today with a new part from Snytaur. I can now read the screen, but it is still very bright with little contrast. I am now thinking there must be another problem. I dont have a schematic, but wonder about the power supply, or something else??? Anyone else seen this issue? Thanks.