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this board had a spill on one side of it and after cleaning it thorougly the 3v8_aon rail was missing.. u8100 got warm with voltage injection so i removed it. now 3v8_aon is 1.4v. Is that because u8100 is needed for that 3v8_aon to be 3.8v?

plt_reset_l is 3.3v except it disappears right with the vcore

you're right. it was the charger. now it powers up and the vcore disasspears after a few seconds then it comes back and stays. but still no usb activity. when using the battery the vcore disappears every 8 seconds

i have a 2020 intel mac air board that had liquid damage and after a thorough cleaning the only issue i found was that pp1v1_s3 has a 5 ohm resistance to ground and the charger was stuck at 5v. i used a dump that found on the internet to program u3060 but now the charger stays at 20v even in...

in smc bypass the fan spins continuously but it still doesn't post

It has no visible liquid damage. When using a 60 watt charger, the ppbus is 12.6v but it does not boot with the charger alone. When booting off the battery, it will power cycle. The cpu vcore it disappear every 8 seconds but when i plug the charger in then the cycling will stop. Is this an smc...

today i found a used screen and it works perfectly with this board. do you think that these new screens are bad?

had an a2251 830-01949 with a cracked screen and replaced it with a new screen purchased from amazon. the new screen is being sold as compatible with multiple models. It never showed an image but i did the mouse test and the optical mouse registered and sometimes the caplock key worked but no...

could you help me out with this board? it had a burned phase mosfet on the cpu circuit and when it powers up the fan never spins and the cpu never gets warm. dabkxdmb8e0 is the board model

i got a spare board today and it did the trick. I hope someone will document how to program a new chip

so the only option to replace ug400 is to take it from the exact location on a donor board of the same model?

it won't enter dfu because of ug400 right?

i wonder if using a brand new chip would make a difference

i thought that any cd3217b12 would work. no? these are not programmed right?

i got it from a 2020 13" a2251

there's no activity on any of them. ug400 was visibly burned when i first started the repair and the first thing replaced

the amp meter show 5v .900 amps and i just let it sit for a few hours. that's must've charged up the battery because now it's booting but not charging. Now all ports show 20v .000 on amp meter but only with the charged battery attached

i'm not familiar with the apple silicone boards. i checked 3v8_aon and ppbus_aon and both are present but the ppbus is only 12.1v

it will not enter dfu mode. the amber indicator on the magsafe turns off for a second whenever the power button is pressed

this board was shorted at ppbus because of ug800. i've replaced ug800 and still no 20v. what's the function of UG800? is pp5v_s2sw_usbc23 important?