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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
So the display is blank? Do you have a small digital multimeter for some testing?
I am adding a link to the Service Manual for this model. See that section on checking for power to the upper control board on the front. Page 12. Let me know what you find and we can go from there. All follow ups are including in our fee. No time limit. http://www.beamalarm.com/foretravel-links/PDF/dometic_rm7030_7732SM.pdf
Just checking back in to see if perhaps you may have missed by earlier responses to your question? Easy to do considering the volume of e-mail that most of us get every day. If you need me to resend this information please let me know. Thanks!