BOSTON — The bad news for the Lakers was that they lost Game 4 of the NBA Finals tonight and find themselves tied with the Boston Celtics at two victories apiece. The worse news is that Andrew Bynum played only 1 minute, 50 seconds in the second half because of his injured right knee. His status for Game 5 on Sunday is uncertain. Bynum said he expected his personal doctor, David Altchek, to travel from his New York office to examine him. Bynum sounded a defiant tone when asked if could play hurt in Game 5, saying, “That’s what I’m going to have to do. I’m prepared to do it.”