Chosen Solution
I opened my MacBook Pro the other day to tighten hinge screws. Put it back together and the LCD backlight is dead. Assume logic board, buy another model (same mid-2012, 13”) Boot the new (used) MacBook up to make sure everything’s working. It has HDD and plan is to just put my SSD from original computer in the one I just bought. Pull SSD and RAM (16 g) from original model and add to new one. Boot. Discover OS incompatibly and realize I’ll have to upgrade “new” computer to Catalina before I try to install SSD. Put HDD back in new model and go to boot. Logic board dead. No power. No charge meter light. No MagSafe light (and then sporadic orange blinking light). Assuming incompetence on my part. QUESTION: Why am I killing logic boards? Are they that fragile? Am I unknowingly full of static? Should l not have plugged my phone into speakers to listen to music while doing repairs? Are these consequences from not unplugging the battery while working at play here?
Static is a large possibility given the its winter time so the air tends to be drier! Did you mess up the screws and blocks? Or force something?
