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Today I followed the step to remove the logic board and the fan, and then I cleaned the dust, assembled again.
But.....no light on MagSafe, and when pressing the power button, there was no life sign....
I'd tried SMC, but no life sign neither.
I wonder what the problem might be?
Thank you.
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If you removed the heat sink you must reapply a thin coat of thermal paste. (This would not cause a power on failure, but you don't mention reapplying thermal paste - it is an essential step to stop overheating)
Double check the reassembly of all the connectors, especially those to the internal mag-safe, keyboard and the HD. They are easy to destroy if you do not remove them carefully.
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Thank you machead3, I reassembled but it didn't work. I didn't remove the heat sink. I think some little part on Logic Board is broken, so changing another Logic Board might be my final option.
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Why did you remove the logic board? Was it not starting before reassembly?
из originalmachead
I wanted to clean up the CPU side on the Logic Board and touch pad, they were covered with dust. But....you know the rest. Thank you fellows, I will try you suggested. English is not my primary language, so there might be mistakes in grammar.
из Albert
It worked fine before reassembly, an insect crawled into the computer and I found its dead body.
из Albert