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Need help for the blinking screen after new logic board was installed with an eprom 30.81

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I just installed the new red logic board for the DN 5591. Everything's working fine except for the screen. It keeps blinking "Enjoy the Fresh Drink" which is supposed to be solid. However, when I go to the service, test, set up mode, the screen is solid. I heard that I need a new display board and a new harness. Please tell me if they're cause that problem. If anyone have them for sale, let me know.



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