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I am going to replace the logic board in MBP A1150 and need to know if the thermal paste on chips needs to be replaced and, if so, how to do it.
Yes you will need to replace it, look at steps 27 to 29 here: MacBook Pro 15" Core Duo Model A1150 Logic Board Replacement Here is a guide on how to remove and reapply thermal paste: How to Apply Thermal Paste