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the fans rotate normally, remove the j9600 and use external usb with catalina, "something curious" when it starts it does not show the apple but the progress bar appears. It does not enter the system externally but to the recovery mode, it does not have a boot security utility.

I have this machine that takes time to turn on, I already reprogrammed bios and format but still the problem continues. When the machine is in sleep and you press any key to bring up the image, it freezes and reboots, "displaying a screen in three languages and Chinese letters" Inspecting the...

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

You won't believe me but I already did it, I restored T2 and nothing... :(

those lines have continuity from end to end. both from the resistors to the J8500 connector and from the resistors to the capacitors. Values in diode 521 both lines 33 ohms in both

I know which one you mean, the one connected in the J8500 to the LCD pcb. I changed it and it's still the same. They changed the keyboard on this machine, the strange thing is that I tried another board on the same base and it works. Could it be a BIOS issue?

the LCD one, of course.

1.8V both

I did the test and nothing, there is no low brightness reaction when covering the camera

ok I did the following test, put the functional board and put the iphone light on the camera and turn off the brightness of the keyboard, the board that I am repairing does not do the same, then the ALS is damaged, then where is the integrated one that controls ? T2? because 1.8v voltages go to T2

i2c_ALS_SCL 1.8V i2c_ALS_SDA 1.8V

You say that when I cover the camera the brightness should go down right?

yes, it lowers and raises the brightness from the keyboard without problem.

you mean the ambient light sensor, ok when covering the camera on the screen with your finger or hand, it does not show brightness either.

ALS?

I just opened the camera and it works correctly

Hi everyone. This macbook does not work the keyboard illuminator, I see that in the system preferences it does not detect it. I tried another plate of the same model 820-01521 in the case and if it is detected by the lighting in the system preferences and when I press the keys it lowers and...

if you are referring to the system, I already did it with an external disk with system, booted

I don't understand you brother. Sorry