Re: Macbook Air A1466 820-000165 Fan allways on 6200rpm

I already tried another Fan. I have no scope to Check tach but with mac Fan control it displays RPM Signal.

Re: Macbook Air A1466 820-000165 Fan allways on 6200rpm

I already found that thread and switched with a known good one.
Resistance of the Resistors in this area are right.
Then i reflowed it as best as possible with the connectors nearby, but no difference.
I also measured from SMC_FAN_0_CTL to R6061 using a testpoint on the backside near C7601 and i get 400/500KOhm depending on which side of the resistor i measure. But reading the schematics there should be no resistance, since it is a trace on the board. Or am i thinking wrong?

Re: Macbook Air A1466 820-000165 Fan allways on 6200rpm

Thank you for the fast reply. Both signals are 3.3V

Hello, i have a Macbook Air A1466 820-000165 where the fan is constantly running 6200rpm, as soon as i hit the power button.
I already tried a different fan, reset of SMC and PRAM. No difference.
So i measured the voltage on the connector
1:5V PP5V_S0
2:1.6V TACH
3:4.6V Motor Control
4:0V GND

I checked HW Monitor temperatures are in the normal range, no missing signals.

What can i check next?

Re: New Members - please post your introductions here

Hello, i found this site while searching for schematics and found some good information. I just started to fix my laptop. Hopefully i can achieve that with your help. Thanks in advance.