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California Prop 65
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I was told by an apple store that the I/o board had a problem but because they found traces of coffee near the battery lid they didn't repair it for me under the AppleCare warranty I had which was a big shame.
I put this off for a long time but after receiving the parts and sitting down to do it it took me an hour or so to replace it and it fixed the problem straight away. On the origInal i/o board there were three tiny condensors that had burned away but as far as I can see there was no evidence of coffee on this board so I don't think this was caused by spilling coffee at all.
Smooth as silk.
When you take out screws put them in little bowls or containers you put on a sheet of paper. Write down the step number and use colored markers in the same colour as the guide if you need to make sure you distinguish between different screws.
I only needed to do that in one step and drew colored circles on the paper and put the screws in the respective circles.
Don't be hasty and don't force anything.