Is there a fuse in SX500IS camera?

Is there a fuse or similar device in this camera? My camera suddenly stopped powering up. I suspect it may have been due to reverse polarity. The usual trouble shooting did not help. I have tried all the various ways to turn the power on. Is there a fuse in this camera or a resettable switch of some kind? Where, how to test it and how to replace it? Where can I get the schematics for this camera? Couple of camera parts places were not helpful. Thanks.