MacBook Air 13” (2014) – Water Damage, will not power on
Hi everyone. I have a water damaged (tea) MacBook Air that was dead as a doorknob. No light on the MagSafe, no fan or anything. A visual inspection of the logic board (820-3437-B) showed no classical water damage (corrosion) but the backlight diode (D7701) was literally blown off the board (replaced). The LVDS connector however is in excellent condition. I also found a burnt pin on the I/O Flex (821-1722-A), which I repaired.
So after all of this, the Green MagSafe light comes on and then turns orange to show that the battery is charging.
PP3V3_G3H measures 3.4V
PPBUS_G3H measures 8.6V
The SO, S3 & S5 rails are present.
Despite all of this, the computer will not power on so I’m starting to think it is a keyboard issue but I’m reluctant to order an expensive replacement upper case just to test. Is there any way to test (or circumvent) this keyboard? Do you have any other troubleshooting ideas?
Thanks everyone for the help. I goit the MBA fully booted and started configuring it. @reecee nailed it with having me probe ALL_SYS_PWRGD and I found a U1950 Dual AND Gate IC that had a cold (or corroded) solder joint. I replaced it and the MBA booted!
The last issue is getting it to switch from AC to battery without shutting down. I have created a new question (Shuts down when disconnected from AC)
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