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1.8GHz dual-core Intel Core i5 (Turbo Boost up to 2.8GHz) with 3MB shared L3 cache

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water damage, no sound, very slow, fan keep spinning in high speed

MacBook Air 13" Mid 2012

Spilled some water on it, then some keys stopped working, so I replaced the keyboard, the new keyboard works fine, however after the replacement; there is no sound at all (not even the boot up chime) , and it becomes very slow , even just moving the mouse lags; and the fan is always spinning at high speed;

The WIFI also malfunctioned after replacement for some time (no hardware installed), but somehow it is working again.

I tried to reset SMC, doesn't work, the LED on the magnet connector doesn't even light up.

which part might be wrong in such case? logic board or I/O board?

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Personally I would run both the board and the I/O board through my ultrasonic cleaner. There's probably still gunk/corrosion causing these issues.

If the board or I/O board have been damaged, an ultrasonic cleaning won't help, but the first step is to remove the gunk and verify that's not the problem.

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John, very long time, no see ;-)

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Thanks for your answer, however I don't have a ultrasonic cleaner, and from the visual inspect, the boards do not seem to be dirty

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Hi @mayer ! Good to see you and hope you're doing well!

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Concerning the board, have you inspected the other side? If the liquid came through the keyboard, corrosion could easily be on the other side. Even then, it's not necessarily visible -- part of the benefit of an ultrasonic cleaner is that they clean UNDER the chips.

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