Chosen Solution
I was fixing a friend’s MacBook Pro 13” 2017 with TouchBar. I’ve worked on Macs and iPhones hundreds of times. I opened up the bottom cover and undid the pancakes screw to disconnect the battery and bent the flex cable back a bit to make sure it doesn’t contact the battery during repair. I went ahead and replaced the screen and then replaced the battery connector and screw. After, I tried turning on the MacBook and I got nothing. No backlight on keyboard, no chime when I plug in power adapter, and no response from trackpad. I went ahead and did the SMC reset and PRAM reset, but I got nothing. I then went back and replaced the new screen with the old one thinking the new one was defective or shorting out somewhere. Nothing with the old screen either. So I put the new screen back on. I did some trouble shooting and found out if I leave the battery connector disconnected, the MacBook powers on with the power adapter plugged in. when I connect the battery back to the motherboard, it doesn’t power on even with the power adapter plugged in. I think it’s safe to say it’s the battery or battery connector to the motherboard. Not sure if that connector piece is replaceable or not. Any advice would be greatly appreciated.
I sent off my MacBook to a repair shop that handles board-level repairs, and they confirmed it was the battery that was causing the issue, not the motherboard or power connector.
Ouch! I haven’t encountered that so I just don’t know. I think you’ll need to bring the system into Apple when they reopen. Take some pics of the logic board markings as well as the systems S/N number, so when you get the system back you can see if they exchanged out the logic board.
When this happens simply disconnect SMC ribbon cable and pancake battery screw first, then unclip all the Connectors that are accessible when back cover plates are removed… wait a few minutes. Reconnect all Connectors and protective plates then, the pancake battery screw and SMC ribbon cable. Turn MacBook over insert charging cable and lift the lid, your MacBook will turn on… after Initial start up it will turn on with or without charging cable connected
