TechVid this could simply be a depleted battery. I suggest you start by replacing the battery. Here is the guide for it [guide|56437] Replacement batteries are available at places [https://www.ebay.com/itm/152961055422?chn=ps&toolid=20004&campid=5338035637&mkrid=711-53200-19255-0&mkevt=1&mkcid=1|like this] Re-evaluate once you have the battery replaced. If nothing else it will provide a known-well starting point for further troubleshooting.