Sony XL-2100U Projector Lamp for KF-42WE610, KF-50WE610, KF-60WE610, KDF-60XBR950, KDF-70XBR95 "change time bravia tv" Questions

...on the front do not change. It will usually only do this after it has been on for a while. It will do not many times randomly while watching. i need to open the back of my sony bravia tv to change ...