Casio F-8, Parts or Restore, new battery but it stopped working, rare vintage

So here is another very rare vintage Casio.  I put a new Renata brand battery in it 2/25/26 and it fired right up and worked for about 15 minutes.  I took a photo of the insides of the watch to show its clean inside and of watch when it briefly worked.  Unfortunately it stopped working and its now up for sale for another collector to restore or for parts.  As is.  Screen has what appears to be burn in?  No idea really what it needs to work or be fixed.  I don’t specialize in vintage casio so I am out of ideas.  Condition: See photos/video for condition. The watch is previously used.  Expect watch to show signs of wear to case, crystal, bracelet, etc.    Battery: Battery life varies due to age, shelf life, and other factors. There is no guarantee as to the battery life in this watch. Battery information such as replacement date and brand are for reference purposes only. Future battery changes are the responsibility of the buyer.    From smoke free home.  Colors: I do not alter pictures or adjust colors in pictures.  I use the basic poshmark camera option with the lighting in my house. Because of technical reasons colors might appear different on your screen than in person.  Shipping: I treat my buyers like I would want to be treated. I pack all my items with great care and ship promptly.   All items sold as is.