Hey all. Sorry if this is in the wrong subsection of the G-Shock category. This is my first post.

Three years ago I bought a GW-5500. For the past year however I haven't worn it. The battery indicator shows it still has a high charge (from high, medium, and low). The face displays properly and the beeps function as well. However there is no illumination whatsoever even in a pitch black room. If I remember right, when I put it away about a year ago the light was working but seemed much dimmer than when new. Unfortunately the warranty has expired though I still have all the paperwork. Is this likely a battery related problem or something more serious? Ballpark, what would a repair likely cost?

Thanks everyone!