Was considering purchasing new remote, because of non-functioning volume buttons on Yamaha RAV494 . This solution WORKED, best guide, best answer, best advice (search words!). The circuit grid had a sticky oily residue that also covered the buttons on that side. Still not sure where it came from, but it cleaned up quickly with rubbing alcohol, cotton swabs, and lint free cloth. Used smallest thinnest tech flat screwdriver to pry open the case after removing battery screw. Cleaned circuit, buttons, and case before re-assembly. DEFINITELY line the buttons up before closing the case; turn the front upside down, insert the buttons, inspect that they are through their holes, then check again after inserting circuit grid but before closing case. Also cleaned infrared window. After closing case, I scraped and filed down the inevitable scratches back to a smooth surface. Works like new! I have a "new" remote, and a happy husband.