Güncel sürümün sahibi: Howard
Metin:
| Just had the same but slightly different failure behavior. But somehow fixed it (described below) after a bunch of random trials. Probably some kind of keyboard/trackpad subsystem firmware corruption problem. | |
| ***Poor Design / Assembly Direction*** | |
| - | First the whole design kind of sucks. Keyboard/Trackpad flex is pulled before battery disconnect AND connected AFTER battery connect. Prior to pulling the flex on disassembly, there is a button on logic board to press for |
| + | First the whole design kind of sucks. Keyboard/Trackpad flex is pulled before battery disconnect AND connected AFTER battery connect. Prior to pulling the flex on disassembly, there is a button on logic board to press for 10-15s 3 times per this direction (my LED never lit up). Maybe some kind of magic step is necessary during assembly as well. Didn't see any mentioning in a couple of guides. Seems like bad stuff can happen trying to insert the flex with new battery already connected. |
| Glued on battery means if you want to tested it before gluing it on, this flex will be reattached with battery power connected at least 2x if not more. More chance to go wrong. My problem didn't start after the first test, rather few dis/reassembly later (1 time forgot to connect power button flex, 2nd time discovered LCD flex was slightly crooked and no screen etc. Each keyboard trackpad connect after battery connect seems like risk to corrupt the keyboard/trackpad/ | |
| ***Problem Symptom*** | |
| First time I discovered the problem was when computer was slow booting up. All keyboard trackpad input was sluggish. Keyboard backlight was flickering and different keys had different brightness in random pattern. | |
| Of course natural instinct is to disassemble + reassemble which goes through the above mentioned poor design problem once again. And probably a few times just to check your work, inspect cable connections etc. | |
| Eventually, there was no more keyboard and trackpad function (keyboard backlight black) during macOS but they do work in a couple of places | |
| * up to about midway during macOS boot, they work then macOS gets to a point where its probably loading drivers, then stopped working. | |
| * work in diagnostic mode | |
| * work in network update | |
| * even worked booting in safe mode | |
| * But these behaviors started changing in my sequence of repair attempts listed below | |
| System Report->More Info->Hardware->SPI shows no keyboard/trackpad. Heck even webcam didn't work on Photo Booth (camera hardware present in System Report) App comes up, green webcam light on. No pic showing, can't take pics. | |
| Note I've connected BT keyboard + mouse at this point to further diagnostic inspection. | |
| ***First Repair Attempt*** | |
| Found this post with popular solution, Read the most popular answer by maffoo | |
| [post|141693] | |
| Tried it with MB running in all kind of state. Didn't work. | |
| ***2nd Repair Attempt*** | |
| Thought maybe load Win10 and see what its drivers does. Went through bootcamp and started installing win10, noticed win10 boot during install still no keyboard+trackpad. Decide to preempt this long effort and powered off, (vaguely recall I may have SMC reset here) restart and Mac boot goes into some kind of weird mode booting back to macOS with a spinning wait icon was in front of Apple logo on boot process... Strange looking so I force reboot it again a couple of times but it always did this so just let it do what it was trying to do. Eventually got got back into macOS, keyboard+trackpad was working! keyboard backlight no, webcam+PhotoBooth working. | |
| Tested with a reboot (can't remember if was cold reboot) Still working. Decided to push my luck and do SMC reset... and back to square one : no keyboard + trackpad. Although webcam + PhotoBooth now stayed working. | |
| Tried a bunch of SMC reset with macOS running in various state (diag mode, booting up, network recovery) nothing worked. | |
| ***3rd Repair Attempt*** | |
| Started reading about people saying could be firmware since it works sometimes (1/2 way of boot, diag mode, net recovery etc) Decided to try originally shipped macOS so network recovery to El Capitan. Didn't work. Left it over night, next morning same problem. Network recovery back to Big Sur, Didn't work. Reboot a couple of times and eventually, keyboard + trackpad was working! after macOS booted up. Yay, keyboard backlight shows the crazy brightness patterns noted above. Pressed keyboard backlight brightness down to 0 and backup. No fix. | |
| Rebooted again and magically keyboard backlight is now perfect. | |
| This is the current state. MB warm reboot, cold boots, sleep, wake all perfect. Not daring another SMC reset for now haha. | |
| ***What fixed it?*** | |
| Who knows but perhaps it has something to do with going back to El Capitan and back to Big Sur triggering some kind of keyboard trackpad firmware reload? My guess is keyboard/trackpad subsystem's firmware got screwed up by the poor power before flex assembly sequence. Keyboard trackpad is not some simple dumb device. Definitely some microcontroller and therefore firmware in there. | |
| Maybe even multiple microcontrollers? (1 for keyboard, 1 for trackpad, 1 for backlight) and one has to work before helping to reload the next one? Thus my observation after keyboard/trackpad started working, one (or maybe 2?) more reboot was necessary for trackpad. | |
| Maybe Genius Bar have tools that can reload these firmware directly. Don't know. They usually just to tell you to be new devices on harder problems haha. | |
| Long winded post but thought I provide full context for someone else puling their hair out on this. |
Durum:
open
Düzenleyen: Howard
Metin:
| Just had the same but slightly different failure behavior. But somehow fixed it (described below) after a bunch of random trials. Probably some kind of keyboard/trackpad subsystem firmware corruption problem. | |
| ***Poor Design / Assembly Direction*** | |
| First the whole design kind of sucks. Keyboard/Trackpad flex is pulled before battery disconnect AND connected AFTER battery connect. Prior to pulling the flex on disassembly, there is a button on logic board to press for 10s (my LED never lit up). Maybe some kind of magic step is necessary during assembly as well. Didn't see any mentioning in a couple of guides. Seems like bad stuff can happen trying to insert the flex with new battery already connected. | |
| Glued on battery means if you want to tested it before gluing it on, this flex will be reattached with battery power connected at least 2x if not more. More chance to go wrong. My problem didn't start after the first test, rather few dis/reassembly later (1 time forgot to connect power button flex, 2nd time discovered LCD flex was slightly crooked and no screen etc. Each keyboard trackpad connect after battery connect seems like risk to corrupt the keyboard/trackpad/ | |
| ***Problem Symptom*** | |
| First time I discovered the problem was when computer was slow booting up. All keyboard trackpad input was sluggish. Keyboard backlight was flickering and different keys had different brightness in random pattern. | |
| Of course natural instinct is to disassemble + reassemble which goes through the above mentioned poor design problem once again. And probably a few times just to check your work, inspect cable connections etc. | |
| Eventually, there was no more keyboard and trackpad function (keyboard backlight black) during macOS but they do work in a couple of places | |
| * up to about midway during macOS boot, they work then macOS gets to a point where its probably loading drivers, then stopped working. | |
| * work in diagnostic mode | |
| * work in network update | |
| * even worked booting in safe mode | |
| * But these behaviors started changing in my sequence of repair attempts listed below | |
| System Report->More Info->Hardware->SPI shows no keyboard/trackpad. Heck even webcam didn't work on Photo Booth (camera hardware present in System Report) App comes up, green webcam light on. No pic showing, can't take pics. | |
| Note I've connected BT keyboard + mouse at this point to further diagnostic inspection. | |
| ***First Repair Attempt*** | |
| - | Found this post with popular solution |
| + | Found this post with popular solution, Read the most popular answer by maffoo |
| - | |
| + | [post|141693] |
| Tried it with MB running in all kind of state. Didn't work. | |
| ***2nd Repair Attempt*** | |
| Thought maybe load Win10 and see what its drivers does. Went through bootcamp and started installing win10, noticed win10 boot during install still no keyboard+trackpad. Decide to preempt this long effort and powered off, (vaguely recall I may have SMC reset here) restart and Mac boot goes into some kind of weird mode booting back to macOS with a spinning wait icon was in front of Apple logo on boot process... Strange looking so I force reboot it again a couple of times but it always did this so just let it do what it was trying to do. Eventually got got back into macOS, keyboard+trackpad was working! keyboard backlight no, webcam+PhotoBooth working. | |
| Tested with a reboot (can't remember if was cold reboot) Still working. Decided to push my luck and do SMC reset... and back to square one : no keyboard + trackpad. Although webcam + PhotoBooth now stayed working. | |
| Tried a bunch of SMC reset with macOS running in various state (diag mode, booting up, network recovery) nothing worked. | |
| ***3rd Repair Attempt*** | |
| Started reading about people saying could be firmware since it works sometimes (1/2 way of boot, diag mode, net recovery etc) Decided to try originally shipped macOS so network recovery to El Capitan. Didn't work. Left it over night, next morning same problem. Network recovery back to Big Sur, Didn't work. Reboot a couple of times and eventually, keyboard + trackpad was working! after macOS booted up. Yay, keyboard backlight shows the crazy brightness patterns noted above. Pressed keyboard backlight brightness down to 0 and backup. No fix. | |
| Rebooted again and magically keyboard backlight is now perfect. | |
| This is the current state. MB warm reboot, cold boots, sleep, wake all perfect. Not daring another SMC reset for now haha. | |
| ***What fixed it?*** | |
| Who knows but perhaps it has something to do with going back to El Capitan and back to Big Sur triggering some kind of keyboard trackpad firmware reload? My guess is keyboard/trackpad subsystem's firmware got screwed up by the poor power before flex assembly sequence. Keyboard trackpad is not some simple dumb device. Definitely some microcontroller and therefore firmware in there. | |
| Maybe even multiple microcontrollers? (1 for keyboard, 1 for trackpad, 1 for backlight) and one has to work before helping to reload the next one? Thus my observation after keyboard/trackpad started working, one (or maybe 2?) more reboot was necessary for trackpad. | |
| Maybe Genius Bar have tools that can reload these firmware directly. Don't know. They usually just to tell you to be new devices on harder problems haha. | |
| Long winded post but thought I provide full context for someone else puling their hair out on this. |
Durum:
open
Düzenleyen: Howard
Metin:
| Just had the same but slightly different failure behavior. But somehow fixed it (described below) after a bunch of random trials. Probably some kind of keyboard/trackpad subsystem firmware corruption problem. | |
| ***Poor Design / Assembly Direction*** | |
| First the whole design kind of sucks. Keyboard/Trackpad flex is pulled before battery disconnect AND connected AFTER battery connect. Prior to pulling the flex on disassembly, there is a button on logic board to press for 10s (my LED never lit up). Maybe some kind of magic step is necessary during assembly as well. Didn't see any mentioning in a couple of guides. Seems like bad stuff can happen trying to insert the flex with new battery already connected. | |
| Glued on battery means if you want to tested it before gluing it on, this flex will be reattached with battery power connected at least 2x if not more. More chance to go wrong. My problem didn't start after the first test, rather few dis/reassembly later (1 time forgot to connect power button flex, 2nd time discovered LCD flex was slightly crooked and no screen etc. Each keyboard trackpad connect after battery connect seems like risk to corrupt the keyboard/trackpad/ | |
| ***Problem Symptom*** | |
| First time I discovered the problem was when computer was slow booting up. All keyboard trackpad input was sluggish. Keyboard backlight was flickering and different keys had different brightness in random pattern. | |
| Of course natural instinct is to disassemble + reassemble which goes through the above mentioned poor design problem once again. And probably a few times just to check your work, inspect cable connections etc. | |
| Eventually, there was no more keyboard and trackpad function (keyboard backlight black) during macOS but they do work in a couple of places | |
| * up to about midway during macOS boot, they work then macOS gets to a point where its probably loading drivers, then stopped working. | |
| * work in diagnostic mode | |
| * work in network update | |
| * even worked booting in safe mode | |
| * But these behaviors started changing in my sequence of repair attempts listed below | |
| System Report->More Info->Hardware->SPI shows no keyboard/trackpad. Heck even webcam didn't work on Photo Booth (camera hardware present in System Report) App comes up, green webcam light on. No pic showing, can't take pics. | |
| Note I've connected BT keyboard + mouse at this point to further diagnostic inspection. | |
| ***First Repair Attempt*** | |
| Found this post with popular solution | |
| - | |
| + | https://www.ifixit.com/Answers/View/141693/Why+is+my+keyboard-trackpad+not+working?permalink=answer-213539#answer213539 |
| Tried it with MB running in all kind of state. Didn't work. | |
| ***2nd Repair Attempt*** | |
| Thought maybe load Win10 and see what its drivers does. Went through bootcamp and started installing win10, noticed win10 boot during install still no keyboard+trackpad. Decide to preempt this long effort and powered off, (vaguely recall I may have SMC reset here) restart and Mac boot goes into some kind of weird mode booting back to macOS with a spinning wait icon was in front of Apple logo on boot process... Strange looking so I force reboot it again a couple of times but it always did this so just let it do what it was trying to do. Eventually got got back into macOS, keyboard+trackpad was working! keyboard backlight no, webcam+PhotoBooth working. | |
| Tested with a reboot (can't remember if was cold reboot) Still working. Decided to push my luck and do SMC reset... and back to square one : no keyboard + trackpad. Although webcam + PhotoBooth now stayed working. | |
| Tried a bunch of SMC reset with macOS running in various state (diag mode, booting up, network recovery) nothing worked. | |
| ***3rd Repair Attempt*** | |
| Started reading about people saying could be firmware since it works sometimes (1/2 way of boot, diag mode, net recovery etc) Decided to try originally shipped macOS so network recovery to El Capitan. Didn't work. Left it over night, next morning same problem. Network recovery back to Big Sur, Didn't work. Reboot a couple of times and eventually, keyboard + trackpad was working! after macOS booted up. Yay, keyboard backlight shows the crazy brightness patterns noted above. Pressed keyboard backlight brightness down to 0 and backup. No fix. | |
| Rebooted again and magically keyboard backlight is now perfect. | |
| This is the current state. MB warm reboot, cold boots, sleep, wake all perfect. Not daring another SMC reset for now haha. | |
| ***What fixed it?*** | |
| Who knows but perhaps it has something to do with going back to El Capitan and back to Big Sur triggering some kind of keyboard trackpad firmware reload? My guess is keyboard/trackpad subsystem's firmware got screwed up by the poor power before flex assembly sequence. Keyboard trackpad is not some simple dumb device. Definitely some microcontroller and therefore firmware in there. | |
| Maybe even multiple microcontrollers? (1 for keyboard, 1 for trackpad, 1 for backlight) and one has to work before helping to reload the next one? Thus my observation after keyboard/trackpad started working, one (or maybe 2?) more reboot was necessary for trackpad. | |
| + | Maybe Genius Bar have tools that can reload these firmware directly. Don't know. They usually just to tell you to be new devices on harder problems haha. |
| + | |
| Long winded post but thought I provide full context for someone else puling their hair out on this. |
Durum:
open
Düzenleyen: Howard
Metin:
| Just had the same but slightly different failure behavior. But somehow fixed it (described below) after a bunch of random trials. Probably some kind of keyboard/trackpad subsystem firmware corruption problem. | |
| ***Poor Design / Assembly Direction*** | |
| First the whole design kind of sucks. Keyboard/Trackpad flex is pulled before battery disconnect AND connected AFTER battery connect. Prior to pulling the flex on disassembly, there is a button on logic board to press for 10s (my LED never lit up). Maybe some kind of magic step is necessary during assembly as well. Didn't see any mentioning in a couple of guides. Seems like bad stuff can happen trying to insert the flex with new battery already connected. | |
| Glued on battery means if you want to tested it before gluing it on, this flex will be reattached with battery power connected at least 2x if not more. More chance to go wrong. My problem didn't start after the first test, rather few dis/reassembly later (1 time forgot to connect power button flex, 2nd time discovered LCD flex was slightly crooked and no screen etc. Each keyboard trackpad connect after battery connect seems like risk to corrupt the keyboard/trackpad/ | |
| ***Problem Symptom*** | |
| First time I discovered the problem was when computer was slow booting up. All keyboard trackpad input was sluggish. Keyboard backlight was flickering and different keys had different brightness in random pattern. | |
| Of course natural instinct is to disassemble + reassemble which goes through the above mentioned poor design problem once again. And probably a few times just to check your work, inspect cable connections etc. | |
| Eventually, there was no more keyboard and trackpad function (keyboard backlight black) during macOS but they do work in a couple of places | |
| * up to about midway during macOS boot, they work then macOS gets to a point where its probably loading drivers, then stopped working. | |
| * work in diagnostic mode | |
| * work in network update | |
| * even worked booting in safe mode | |
| * But these behaviors started changing in my sequence of repair attempts listed below | |
| System Report->More Info->Hardware->SPI shows no keyboard/trackpad. Heck even webcam didn't work on Photo Booth (camera hardware present in System Report) App comes up, green webcam light on. No pic showing, can't take pics. | |
| Note I've connected BT keyboard + mouse at this point to further diagnostic inspection. | |
| ***First Repair Attempt*** | |
| Found this post with popular solution | |
| [post|141693] | |
| Tried it with MB running in all kind of state. Didn't work. | |
| ***2nd Repair Attempt*** | |
| Thought maybe load Win10 and see what its drivers does. Went through bootcamp and started installing win10, noticed win10 boot during install still no keyboard+trackpad. Decide to preempt this long effort and powered off, (vaguely recall I may have SMC reset here) restart and Mac boot goes into some kind of weird mode booting back to macOS with a spinning wait icon was in front of Apple logo on boot process... Strange looking so I force reboot it again a couple of times but it always did this so just let it do what it was trying to do. Eventually got got back into macOS, keyboard+trackpad was working! keyboard backlight no, webcam+PhotoBooth working. | |
| Tested with a reboot (can't remember if was cold reboot) Still working. Decided to push my luck and do SMC reset... and back to square one : no keyboard + trackpad. Although webcam + PhotoBooth now stayed working. | |
| Tried a bunch of SMC reset with macOS running in various state (diag mode, booting up, network recovery) nothing worked. | |
| ***3rd Repair Attempt*** | |
| Started reading about people saying could be firmware since it works sometimes (1/2 way of boot, diag mode, net recovery etc) Decided to try originally shipped macOS so network recovery to El Capitan. Didn't work. Left it over night, next morning same problem. Network recovery back to Big Sur, Didn't work. Reboot a couple of times and eventually, keyboard + trackpad was working! after macOS booted up. Yay, keyboard backlight shows the crazy brightness patterns noted above. Pressed keyboard backlight brightness down to 0 and backup. No fix. | |
| Rebooted again and magically keyboard backlight is now perfect. | |
| This is the current state. MB warm reboot, cold boots, sleep, wake all perfect. Not daring another SMC reset for now haha. | |
| ***What fixed it?*** | |
| Who knows but perhaps it has something to do with going back to El Capitan and back to Big Sur triggering some kind of keyboard trackpad firmware reload? My guess is keyboard/trackpad subsystem's firmware got screwed up by the poor power before flex assembly sequence. Keyboard trackpad is not some simple dumb device. Definitely some microcontroller and therefore firmware in there. | |
| + | Maybe even multiple microcontrollers? (1 for keyboard, 1 for trackpad, 1 for backlight) and one has to work before helping to reload the next one? Thus my observation after keyboard/trackpad started working, one (or maybe 2?) more reboot was necessary for trackpad. |
| + | |
| Long winded post but thought I provide full context for someone else puling their hair out on this. |
Durum:
open
Düzenleyen: Howard
Metin:
| - | Just had the same but slightly different failure behavior. But somehow |
|---|---|
| + | Just had the same but slightly different failure behavior. But somehow fixed it (described below) after a bunch of random trials. Probably some kind of keyboard/trackpad subsystem firmware corruption problem. |
| ***Poor Design / Assembly Direction*** | |
| - | First the whole design kind of sucks. Keyboard/Trackpad flex is |
| + | First the whole design kind of sucks. Keyboard/Trackpad flex is pulled before battery disconnect AND connected AFTER battery connect. Prior to pulling the flex on disassembly, there is a button on logic board to press for 10s (my LED never lit up). Maybe some kind of magic step is necessary during assembly as well. Didn't see any mentioning in a couple of guides. Seems like bad stuff can happen trying to insert the flex with new battery already connected. |
| - | Glued on battery means if you want to tested it before gluing it on, this flex will be reattached with battery power connected at least 2x if not more. More chance to go wrong. My didn't start after the first test, rather |
| + | Glued on battery means if you want to tested it before gluing it on, this flex will be reattached with battery power connected at least 2x if not more. More chance to go wrong. My problem didn't start after the first test, rather few dis/reassembly later (1 time forgot to connect power button flex, 2nd time discovered LCD flex was slightly crooked and no screen etc. Each keyboard trackpad connect after battery connect seems like risk to corrupt the keyboard/trackpad/ |
| ***Problem Symptom*** | |
| - | First time I discovered the problem was when computer was slow booting up. All keyboard trackpad |
| + | First time I discovered the problem was when computer was slow booting up. All keyboard trackpad input was sluggish. Keyboard backlight was flickering and different keys had different brightness in random pattern. |
| - | Of course natural instinct is to disassemble + reassemble |
| + | Of course natural instinct is to disassemble + reassemble which goes through the above mentioned poor design problem once again. And probably a few times just to check your work, inspect cable connections etc. |
| Eventually, there was no more keyboard and trackpad function (keyboard backlight black) during macOS but they do work in a couple of places | |
| - | * up to about midway during macOS boot, they work |
| + | * up to about midway during macOS boot, they work then macOS gets to a point where its probably loading drivers, then stopped working. |
| * work in diagnostic mode | |
| - | * work |
| + | * work in network update |
| * even worked booting in safe mode | |
| * But these behaviors started changing in my sequence of repair attempts listed below | |
| + | System Report->More Info->Hardware->SPI shows no keyboard/trackpad. Heck even webcam didn't work on Photo Booth (camera hardware present in System Report) App comes up, green webcam light on. No pic showing, can't take pics. |
| - | |
| + | Note I've connected BT keyboard + mouse at this point to further diagnostic inspection. |
| ***First Repair Attempt*** | |
| Found this post with popular solution | |
| [post|141693] | |
| Tried it with MB running in all kind of state. Didn't work. | |
| - | BTW, have BT keyboard + mouse hooked up by now just to operate the MB |
| - | |
| ***2nd Repair Attempt*** | |
| - | Thought maybe load Win10 and see what its drivers does. Went through bootcamp and started installing win10, noticed win10 boot during install still no keyboard+trackpad. |
| + | Thought maybe load Win10 and see what its drivers does. Went through bootcamp and started installing win10, noticed win10 boot during install still no keyboard+trackpad. Decide to preempt this long effort and powered off, (vaguely recall I may have SMC reset here) restart and Mac boot goes into some kind of weird mode booting back to macOS with a spinning wait icon was in front of Apple logo on boot process... Strange looking so I force reboot it again a couple of times but it always did this so just let it do what it was trying to do. Eventually got got back into macOS, keyboard+trackpad was working! keyboard backlight no, webcam+PhotoBooth working. |
| Tested with a reboot (can't remember if was cold reboot) Still working. Decided to push my luck and do SMC reset... and back to square one : no keyboard + trackpad. Although webcam + PhotoBooth now stayed working. | |
| Tried a bunch of SMC reset with macOS running in various state (diag mode, booting up, network recovery) nothing worked. | |
| ***3rd Repair Attempt*** | |
| - | Decided to try |
| + | Started reading about people saying could be firmware since it works sometimes (1/2 way of boot, diag mode, net recovery etc) Decided to try originally shipped macOS so network recovery to El Capitan. Didn't work. Left it over night, next morning same problem. Network recovery back to Big Sur, Didn't work. Reboot a couple of times and eventually, keyboard + trackpad was working! after macOS booted up. Yay, keyboard backlight shows the crazy brightness patterns noted above. Pressed keyboard backlight brightness down to 0 and backup. No fix. |
| Rebooted again and magically keyboard backlight is now perfect. | |
| - | This is the current state. Not daring another SMC reset for now haha. |
| + | This is the current state. MB warm reboot, cold boots, sleep, wake all perfect. Not daring another SMC reset for now haha. |
| ***What fixed it?*** | |
| - | Who knows but perhaps it has something to do with going back to El Capitan and back to Big Sur triggering some kind of keyboard trackpad firmware |
| + | Who knows but perhaps it has something to do with going back to El Capitan and back to Big Sur triggering some kind of keyboard trackpad firmware reload? My guess is keyboard/trackpad subsystem's firmware got screwed up by the poor power before flex assembly sequence. Keyboard trackpad is not some simple dumb device. Definitely some microcontroller and therefore firmware in there. |
| Long winded post but thought I provide full context for someone else puling their hair out on this. |
Durum:
open
Orijinal gönderinin sahibi: Howard
Metin:
Just had the same but slightly different failure behavior. But somehow kind of fixed it (described below). Probably some kind of keyboard/trackpad HW subsystem firmware corruption problem. ***Poor Design / Assembly Direction*** First the whole design kind of sucks. Keyboard/Trackpad flex is pull before battery AND connected AFTER battery. Prior to pulling the flex on disassembly, there is a button on logic board to press. Maybe some kind of magic step is necessary during assembly as well. Didn't see any looking a a couple of guys. Seems like bad stuff can happen trying to insert the flex with new battery already connected. Glued on battery means if you want to tested it before gluing it on, this flex will be reattached with battery power connected at least 2x if not more. More chance to go wrong. My didn't start after the first test, rather a couple test later (1 time forgot to connect power button flex, 2nd time discovered LCD flex was slightly crooked and no screen etc. ***Problem Symptom*** First time I discovered the problem was when computer was slow booting up. All keyboard trackpad UI was sluggish. Keyboard backlight was flickering and different keys had different brightness in some of random pattern. Of course natural instinct is to disassemble + reassemble with the above mentioned problem. Eventually, there was no more keyboard and trackpad function (keyboard backlight black) during macOS but they do work in a couple of places * up to about midway during macOS boot, they work just before * work in diagnostic mode * work doing network update * even worked booting in safe mode * But these behaviors started changing in my sequence of repair attempts listed below System Report->More Info->Hardware->SPI shows no keyboard/trackpad. Heck even webcam didn't work on Photobooth (camera hardware present in System Report) App comes up, green webcam light on. No pic showing, can't take pics. ***First Repair Attempt*** Found this post with popular solution [post|141693] Tried it with MB running in all kind of state. Didn't work. BTW, have BT keyboard + mouse hooked up by now just to operate the MB ***2nd Repair Attempt*** Thought maybe load Win10 and see what its drivers does. Went through bootcamp and started installing win10, noticed win10 boot during install still no keyboard+trackpad. Powered off, (vaguely recall I may have SMC reset here) restart and goes into some kind of weird mode booting back to macOS. Spinning wait icon was in front of Apple logo on boot process... strange looking. But once I got back into macOS, keyboard+trackpad was working! keyboard backlight no, webcam+PhotoBooth working. Tested with a reboot (can't remember if was cold reboot) Still working. Decided to push my luck and do SMC reset... and back to square one : no keyboard + trackpad. Although webcam + PhotoBooth now stayed working. Tried a bunch of SMC reset with macOS running in various state (diag mode, booting up, network recovery) nothing worked. ***3rd Repair Attempt*** Decided to try original macOS so network recovery to El Capitan. Didn't work. Left it over night, next morning same problem. Network recovery back to Big Sur, Didn't work. Reboot a couple of times and one of these times, keyboard + trackpad was working after macOS booted up! Yay, keyboard backlight shows the crazy patterns noted above. Pressed keyboard backlight brightness down to 0 and backup. No fix. Rebooted again and magically keyboard backlight is now perfect. This is the current state. Not daring another SMC reset for now haha. ***What fixed it?*** Who knows but perhaps it has something to do with going back to El Capitan and back to Big Sur triggering some kind of keyboard trackpad firmware update? My guess is keyboard/trackpad subsystem's firmware got screwed up by the poor power before flex reassembly sequence. Keyboard trackpad is not some simple dumb device. Definitely some microcontroller and therefore firmware in there. Long winded post but thought I provide full context for someone else puling their hair out on this.
Durum:
open