Re: The Exorcist
On a more serious note, a lot of older monitors and TVs suffered not from dry joints but from joints which had never been soldered at all, or from oxidation(*) buildup on plugs/sockets.
Whacking the thing usually worked. Taking it apart, replugging everything and looking for the inevitable missing solder usually(**) worked permanently.
(*) Or worse if there were smokers around.
(**) unless there were smokers around the equipment.