Fan at full speed and poor performance after repair and waterspill

Hi all,

I have an Macbook Air 13" Model A1369 EMC 2469

and have had a juice spill on the the keyboard. The laptop has worked fine for a long time but after a while the keyboard stopped working on some of the buttons and I replaced the keyboard. I noticed there where some residue on the logic board while repairing and have tried to clean it with Alcohol.

After I finished the repair the laptop turns on just fine and boots like normal, but the fan starts from a low RPM at boot up and then faster and faster until I believe it reaches maximum RPM and is consistently running at full speed all the time.

The laptop has also become very slow and have poor performance.

I have looked into the CPU monitor and the kernel task of the CPU is at 310% with 61 threads running.

What I have tried so far:

- I have done SMC reset, and RAM reset but it didn't help.

- I also did a AHT and there was no error showing up.

- Tried disconnection all unnecessary hardware to the logic board, like airport, camera and speakers, no luck.

- Checked the SSD harddrive via diskutility, it checked out fine. But when I look at the read speed it only reads between 30kb/sec and some times up to 2,4mb/sec. Isn't this very slow?

The spill residue was primarily near the CPU and the SSD drive and that was where i cleaned it with alcohol.

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2 Answers

Chosen Solution

It sounds like you need to go back in and clean things again. This time lets use distilled water (not tap water!) using cotton swabs (Q-Tips) moisten them and wipe down the SSD boards connector surfaces, the socket and its solder pads as your description implies you have some corrosion in the connector and/or SSD unit.

The fact the CPU is running so hard is telling us the read/write to the SSD is having problems and the CPU is making multiple requests (read and/or write) to the SSD as it fails to get a good CRC the first time.

Go over any other areas you remember cleaning before as Isopropyl alcohol won't deal with the acids or sugars in the juice unlike distilled water. Once you have cleaned the areas (cleaning each area a few times). Go over the areas again this time with a high grade of Isopropyl alcohol (85% or better).

The goal here is to dissolve the sugars and remove them as well as neutralize the acids which was in the juice with the distilled water and by using the Isopropyl alcohol it will act as a drier pulling the water out of the small gaps under the chips. I still like to air dry the logic board a good day in the warmth of the sun.

Don't forget to use proper ESD protection.

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If you took out the heatsink off the cpu or graphics card chip, you may have removed (or even cleaned up) the thermal compound.

If so, go to any repair shop or pc parts store, or radioshack and get some thermal compound.

Clean up the heatsink and chip (cpu / graphics chip) with 99% alcohol, apply on chip a small amount of compound with a plastic card (old credit card) making sure you spread evenly and leave a uniform very thin layer.

Put heatsink back in place and twist it a little bit carefully and gently (to spread the paste).

This should do.the trick. If not, you may have some more serious damage.

Dan M

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