AKAI S1000 Display problem

Hi all,
after a long time I connected my AKAI S1000 again. Unfortunately the display does not work anymore, see photo. I am not sure if this can be solved by replacing the display or if this could be a problem on the main board?
The display changes its lines patterns when pressing keys on the front panel.

Has anybody seen or fixed such a problem?
Any suggestions how to proceed?
Thanks a lot









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