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Also restored it already and did a clean install ?

yes, PRAM, NVRAM and SMC reset done.

It does - ALS seems to be good ?

Yes, you were right again ? My OEM testing battery did get faulty. Now I have another issue with the keyboard backlight. It's always on and not dimmable. Even if MBA is off. Only turns off if I close the lid.

Hi there, got a MBA A2179 (820-01958) with unknown history but looking clean so far. The Macbook turns on but fan speen increases up to max and it is incredibly slow. Additionally the battery is not correctly recognized (Warning symbol on battery symbol) or charging or running from battery...

*keyboard backlight

I just tried that with but still getting These errors ? But Backlight is working now ?

If I try uhrade to Big Sur from High Sierra I get an error "An error occurred preparing the software update". Have to reinstall High Sierra after every failed try because High Sierra is not bootable anymore after the failed upgrade. May it be a Memory Problem?

Yes I think so too concerning the backlight. But that's another thing ?? I tried but it fails too. For example I try to upgrade to Catalina I get the error on the picture below. I tried the date trick but without any success ??

Hi there ? I got a problem with an A1989 (2018) throwing various errors when trying to install any macOS than High Sierra. When I try to install it with app store I get an error message "application is damaged". If I try it with my install flash stick I get the error message like on the picture...

@capone93 Have you plugged in the power adapter on the faulty MB?

Thank you very much for your patience and your help! I really aperciate it :-) No response on power button. Trackpad is always an. When i hold power button down the trackpad powers off for a second then back on again - without pressing power button again.

Sorry for my very poor formulation! ? Seems like I was too tired when I wrote my last post. I was referring to the DFU mode - there it shows the following behavior: It's always in recovery mode. When I hold power button down it switches off for a sec,coming back to recovery mode. But no...

I retried DFU mode with another power cable for the supply of the (DFU-)macbook. I didn't get a error message yet but it seems to install forever. I will let it install overnight and look what it shows tomorrow.

It powers off for a second when i hold the power button but immediately powers on again.

PPVCCQ_ANI_SSD0: 1.8V PP0V9_SSD0: 0.9V PP2V5_NAND_SSD0: 2.56V SSD0_VR_P2V5_PGOOD: 2.5V SSD0_PMIC_RESET_L: 1.8V All stable... seem to be good.

Already asked that - no important data to save on this board :-) I'm getting the same error message when trying to restore. It takes constant 0.17 amps now. I can't power it off - it just restarts after a second.

After many many tries I was able to enter DFU mode. Think it just needed to be perfect timing because of the pulsing rails. I revived it but it aborted with error message "Unexpected device state "DFU" expected "Recovery"". But rails are not pulsing anymore now. Got all rails stable up to...

I already know that PP1V8_AWAKE and PP1V8_SLPS2R are missing/pulsing. I dont think the others are stable. Sorry for the badly readable post!

I know but unfortunately the shield goes over T2 and U7800 - including the coils. But I was able to measure PP1V8_SLPS2R and PP1V8_AWAKE on QE000 and QE001. Yes I did but was not able to enter DFU mode.