Chosen Solution
Old charger was giving me trouble (mostly cable) for some time. While working, noticed the battery going down, not charging (no light on charger connector). Decided that the cable tried to fix it (fixed it about 4 time before) - nothing. Battery discharged completely, MacBook died. Disconnected battery, plugged Charger back. Reset SMC as was suggested. No sign of life, no light on charger or on the front side of the MacBook, no sounds, just dead. Very low on money, set on trying anything before taking to repair shop. Please advise! Update (08/04/2017) A glimpse of good news. Took the battery out, attached the charger, left the book for half an hour, it came back to life with green light on the Charger connector and power indicator in the front of the book. Worked on the MacBook for an hour or so, decided to check the battery once more. Cleaned battery contacts, connected the battery, connected the charger - MacBook dead again. Took the battery out, connected the charger, after half an hour MB suddenly reacted to the last of several tries and came to life again. So, it seems the battery after all - but why such a long time before the MacBook decides to start up?
How long does it take for the light on the charger to light up? This is very important. If the light doesn’t turn on immediately then this suggests there is a failure with the one-wire circuit or other power rails. It’s a critical circuit for current sensing and allows the device to charge when the charger is connected. On top of this, the one-wire circuit is also powered by G3H. If G3H is missing, then the device will not boot. If it still isn’t working now, it sounds to me like some important power rails aren’t being created. It’s possible your battery could have caused a failure along G3H, depending on how long you have had it. It’s hard to say without actually looking at it and diagnosing it under a microscope. Even without a battery, the Macbook should still turn on when plugged in to the charger. The fact that it doesn’t tells me G3H is shot. Of course, it could also be any number of other things. There’s no way to know for sure without diagnosing it on a board-level.
