Quinton Aaron -- the actor who played Michael Oher in "The Blind Side" -- is on life support after being hospitalized following a collapse at his home ... but there are some positive signs for his recovery.
Quinton's wife, Margarita, tells TMZ ... the medical devices helping keep Quinton alive aren't doing all the work, and he's partially breathing on his own, which gives the family hope.
We're told Quinton's been hospitalized for 4 days now .