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crwdns2934241:0crwdne2934241:0 Dan

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Well, the good news is you don’t need a new logic board! TCOH is a sensor error for the heat sink per the Apple service manual ‘Excessive processor heatsink temperature.’

'''Review:''' Check CPU heat sink sensor cable connection to logic board. It is located on back side and requires removal of the logic board.

'''Symptom:''' If the sensor is disconnected, the CPU fan will run at full speed.

Here’s the connection point

[image|2053656]

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open