My TV store guy has had one for something like 20 years now, he uses it more or less daily. Customers love it, they can find out in about a second if it's the remote, or the gadget at the other end, which needs fixing.
More often than not it's the remote, and more often than anything else, when it is the remote, it's the batteries.
"They're NEW! I just put them in there!" But somehow they always forget to mention that those "new" batteries have been sitting in a camera bag/drawer/tool box for ten years or so.... In a garage where the temperature gets well over 120F on a good summer day.
That, or they let some really antique alkaline cells sit in there for a few months, oozing electrolyte all over the insides and eating away at the circuit board.
(Next most common remote-control-destroyer is a good old-fashioned cola-dunking.... Those are a total loss in ten minutes; the acid in the stuff is truly vicious on copper traces.)
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