Hi. Could do with a bit more info.
What year is your car.
Has the display worked since your new alternator was fitted?
Has all the display died?
Any other electrics affected?
Sorry, it is LS400 1999, no work was done to the display, the multi information display (LCD that shows , miles, fuel avg, etc. single line), the other electrical issues, in reverse the brake light stays on sometimes, same as the auto steering wheel does not function - have to adjust it manually, up and down-
Thank you for your help
Joe