I'm having this same problem with my 2nd board in 10 years. The 1st board had "no cell power" and I didn't throw it away. Glad I didn't because today I found the video about soldering and I brought it back to life! YAY! Now I need a similar fix for my 2nd board which has the problem of losing time. I can set it correct on Thurs and when I return home Monday afternoon, it thinks it is Sunday early AM. Looked at the solder connections and all look pretty good (I work in electronics and have soldered for the last 30 years). Anyone have a suggestion?