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Hi, the CPU fan of my iMac is running at full speed. iStat says it's not running (0rpm). The temperatur sensor is working, my ASP says, that's a problem with the logicboard. Any resets (SMC, PRAM) are done but this problem is still there. I just bought an external fan control but first I want to ask if somebody know the pin assignment of the CPU fan plug.
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crwdns2931729:0crwdne2931729:0:
Something is not right here with iStat. Do you have the older widget or are you use the current version? Give Temperature Gauge a try, does it show the samething? Lets see what the second tool tells us.
The fan speed sensor is part of the fan unit so you may need to replace it. I don't see the logic board as the issue here, pending what new info you can tell us.
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