Chosen Solution
Hi there, Ive worked for years on component level repair logic boards etc but this problem has me stumped, the machine switches on but then instantly acts as if the lid has been shut therefore going into sleep mode, the only way I can get the device to work is buy running it in clamshell mode then installing insomnia (if you haven’t heard its a program that can prevent your Mac sleeping with the lid closed). I couldn’t find an issue with the logic board but I again tested it with a known working one. but still nothing. then I thought they may be sensors etc in the screen so I changed that too but still nothing. What else is there ? I’m stumped. I might also add there is no sign of water damage and the machine passes diagnostics in clamshell mode.
eventually fixed this by replacing the trackpad …. very weird
You’ll need to do some sleuthing! You’ll need a magnet and some steel paperclips. Hopefully you can get the system to alter its state. Take the paperclips and slide it down on the inside surface of the lid around the side and top edges they should stick to the magnets that are located on the lid. Carefully, fold down the display so you can reference the location on the uppercase when the magnets hit. Now try your magnet sliding it on the uppercase when the clips where to see if you can find the Hall effect detectors location (a wax pencil marker might help). One of the magnet locations should cause the the display to turn off. In any case it will give you an idea where to look for the hall effect sensor within the system. If you review the older Unibody 15" hard drive cable we can see the Hall sensor (marked in Red):
So it can be well hidden! I’ve not serviced this system yet so I can’t tell you were its hidden.
Hi all, Am wondering if I’m looking at trackpad replacement also as I have same problem on a 13" MBP mid-2012 (A1278). Reece referred to “these models” and as Lewis’ is from 2016 I’m not sure if mine is included in that family…? Thanks for any help guys. I see trackpad cable is available on its own so might try changing that first. Cheers, Sam.
hi all, I have very similar issue, the only difference is that after SMC reset my Mac(late 16, 13”, Touch Bar) feels ok until I close the lid, it seems that there is no LID_OPEN signal. After SMC reset it works perfectly (sleeps, wakes up, turns on/off) until I close the lid. It happens in safe mode and after clear reinstallation of the system. Should I also try trackpad or start with hall sensors?
