#1 Macbook Air A2179 (Main 820-01958-A ) no power, liquid damage
Napisal/-a robgerr • 6 September 2023, 10:52
Hello forum.
This macbook enters me completely dead, no sign of life, i connect usb tester and i have 5v and no switch to 20v. I open it and find small oxide spots in the components near U3100. I clean, replace the R2800 and R2801 resistors to be safe. I find oxide in the capacitor next to J6700 connector. I clean and replace C6700, small oxide parts cleaned up. Power on for test, the switch seems to work, in fact I get 20V. The macbook turns on and I get to login. Battery completely empty, start charging. I turn off the mac, try to turn it on again but it doesn't react to power on. If I hold power button down for 10 sec, I see that the absorption is lowered, we press the power button again and it turns on. Practically to turn it on I have to hold down for 10 seconds and press the button again and it turns on. I leave the battery under charge all day, today I try again and I only get 5V as power from the usb meter. NO 20V switch. I have an absorption of only 0.08 Amp. With a thermal imaging camera I can't find components that heat up.
I made some measurements in the mainboard:
PPBUS_G3H Coil 6700 12V
PP3V3_G3H_RTC Cap C3100 3,28V
This is the clean area of U3100

This macbook enters me completely dead, no sign of life, i connect usb tester and i have 5v and no switch to 20v. I open it and find small oxide spots in the components near U3100. I clean, replace the R2800 and R2801 resistors to be safe. I find oxide in the capacitor next to J6700 connector. I clean and replace C6700, small oxide parts cleaned up. Power on for test, the switch seems to work, in fact I get 20V. The macbook turns on and I get to login. Battery completely empty, start charging. I turn off the mac, try to turn it on again but it doesn't react to power on. If I hold power button down for 10 sec, I see that the absorption is lowered, we press the power button again and it turns on. Practically to turn it on I have to hold down for 10 seconds and press the button again and it turns on. I leave the battery under charge all day, today I try again and I only get 5V as power from the usb meter. NO 20V switch. I have an absorption of only 0.08 Amp. With a thermal imaging camera I can't find components that heat up.
I made some measurements in the mainboard:
PPBUS_G3H Coil 6700 12V
PP3V3_G3H_RTC Cap C3100 3,28V
This is the clean area of U3100
