No LCD Display

I have a New Brunswick Innova 43R shaking incubator that the LCD screen will only display horizontal lines. I spoke to Eppendorf Tech Support about the problem, they suggested I replace the LCD screen, the control board and cable that links the two. I now have the board and screen replaced and still have the same problem. I've replied to Eppendorf that their solution didn't resolve the issue. Now their not answering my emails. Is there anything else that could be causing the blank screen? Any help in this matter is greatly appreciated.

Thanks,

Randy