Hello everyone Above all, I congratulate the creators of MacRumors, the best Apple Forum. I also apologize for using the Google translator, I do not know the English language, I'm sorry. I have a MacBook Pro A1278 mid-2012, Logic Board: 820-3115-B. It works only with a charged battery. No light, no green or orange on the Magsafe. The MacBook does not start without a charged battery. I have all the tools needed to fix it, but I do not have the skills. Can MacRumors Forum friends help me? I'm a technician, but not an engineer. Thank you for reading my post. Long live the Forum.