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Hi and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, have you tried checking if the AC wall adapter for the base unit is able to supply the 9V DC requirement?
Appreciate the additional information on what has been tried.
Unfortunately, this is the only easy user doable check as all others would be internal to the circuitry of the base unit.
Prior to the e4 display, did all display lighted up something like a series of 8s?
Still, are you then considering to attempt a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter and even a soldering iron?