bradinboise
Member
Hello all, I got a 2018 Macbook air that had some corrosion around U7650. Replaced U7650 and cleaned with ultrasonic cleaner and now it has 20v and .12a at the charge ports but still no boot. Below are the voltages I still do not have:
PP5V_G3S 0v - applied 5v on this line and the fan goes fast and the speed of the fan will sometimes surge up and down a little.
PP5V_S5_LDO 2.5v
PP3V3_G3SW_SNS 0v
PP3V3_G3S 0v
PPVCC_S0_CPU 0v
PP1V8_G3S 0v
All other rails are good and checked for shorts on all the lines above and none are showing a short.
Unplugged battery, no change, still no fan.
Also on the USB voltage tester, the amps will fluctuate a little, .12a to 0 amps every 2-3 seconds.
Just curious if anyone has some clues of what I am missing?
As a side note, with me replacing the U7650, does the T2 chip have to be synced with that chip now? Also before changing the U7650, it was the only chip that was getting hot to the touch, and thus I thought it might be the cause of the issue and because there was a lot of corrosion around this chip.
Thanks
PP5V_G3S 0v - applied 5v on this line and the fan goes fast and the speed of the fan will sometimes surge up and down a little.
PP5V_S5_LDO 2.5v
PP3V3_G3SW_SNS 0v
PP3V3_G3S 0v
PPVCC_S0_CPU 0v
PP1V8_G3S 0v
All other rails are good and checked for shorts on all the lines above and none are showing a short.
Unplugged battery, no change, still no fan.
Also on the USB voltage tester, the amps will fluctuate a little, .12a to 0 amps every 2-3 seconds.
Just curious if anyone has some clues of what I am missing?
As a side note, with me replacing the U7650, does the T2 chip have to be synced with that chip now? Also before changing the U7650, it was the only chip that was getting hot to the touch, and thus I thought it might be the cause of the issue and because there was a lot of corrosion around this chip.
Thanks