L.A.P.D. officers rolled over to Johnny Depp's L.A. mansion early Friday morning ... responding to a call about a possible breach in security ... but TMZ has learned, it was simply a "false alarm."
Law enforcement sources tell us ... Johnny wasn't home at the time ... but when officers arrived to the house, they checked out the property to make sure everything was okay.
Eventually, cops determined there was no actual threat -- and Johnny's house got the "all clear."
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