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- Thread starter Mac Tech
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T2 machine, you can't touch BIOS there.
If you are now sure is ALS issue, need to check continuity on its SCL/SDA lines.
Also check R8556/58.
If you are now sure is ALS issue, need to check continuity on its SCL/SDA lines.
Also check R8556/58.
Try DFU revive, just in case.
If no important data, you can go for restore directly.
If no important data, you can go for restore directly.
Maybe some contact problem in J8500.
Mac Tech
Member
well this case left me unsolved but I'll be waiting if another one arrives, deliver the equipment like this.
I reflowed the lcd connector on the motherboard, I think maybe one of the pins was not making contact, I would have changed it. But good for next time. Thanks for your help @2informaticos
I reflowed the lcd connector on the motherboard, I think maybe one of the pins was not making contact, I would have changed it. But good for next time. Thanks for your help @2informaticos
Be sure that you've diagnosed ALS correctly.
Because if ALS is good, the problem remains hidden on the MLB...
Because if ALS is good, the problem remains hidden on the MLB...
Dozer
Member
I have the same problem here.
In my case as well, the voltages are 1.8 V and the resistance values are correct.
I have two MacBook A1932 units, and I replaced the mainboards in both of them. After that, the ALS sensor no longer worked.
I have now found out that the 2018 and 2019 versions are not compatible with each other. For example, if a 2019 mainboard is installed in a 2018 device, the ALS sensor no longer works. As a result, there is no keyboard backlight and no automatic display brightness adjustment.
The same applies the other way around: if a 2018 mainboard is installed in a 2019 device, the ALS sensor also does not work.
I just wanted to add this information here in the thread in case someone else runs into the same problem in the future.
In my case as well, the voltages are 1.8 V and the resistance values are correct.
I have two MacBook A1932 units, and I replaced the mainboards in both of them. After that, the ALS sensor no longer worked.
I have now found out that the 2018 and 2019 versions are not compatible with each other. For example, if a 2019 mainboard is installed in a 2018 device, the ALS sensor no longer works. As a result, there is no keyboard backlight and no automatic display brightness adjustment.
The same applies the other way around: if a 2018 mainboard is installed in a 2019 device, the ALS sensor also does not work.
I just wanted to add this information here in the thread in case someone else runs into the same problem in the future.