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Ok heres the fun. start unplugging the low DC lines from the power supply and see which line or connector it is thats draining the power supply. then find out where each line goes to. Had one with a dead supply and it was a 5volt line shorted. So i would say something is shorted. In my case it ended up being a sensor wire got under the lens cover and the cover when replaced the tech didn't see it and smashed it against the frame. Look at the history to see who and what they did last visit for repair.
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