CPU Fan runs at full speed.

CPU Fan runs at full speed. 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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Total answers/comments: 3

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mcgyver89 [Entry]

"Selim Avsar

Rep: 85

1

1"

mcgyver89 [Entry]

"Hey scallejam, seems to me your L5701 is missing. L5701 is s labelled on the spec as FERR-220-OHM 0402 .

I uploaded image for reference of its continuity points, hope it helps!"

mcgyver89 [Entry]

"I can confirm that the fix works.

Got help at my office to mount a ""47K 1/16W 5% in a 0402 package"" at the place specified in this page.

They said at my office it looked like there where something mounted there before but is now missing.

After mounting the resistor the fan speed return to normal."