820-4924 Fan on full speed, Airport Proximity 129°C

[dr. moast]

820-4924 came in not booting. SSD was the cause. Changed the SSD and it boots.

However, now the fan runs on full speed. HWSensors shows Airport Proximity Thermal Sensor at 129°C, all others just fine (around 40°C)
I don't have ASD for that machine, MRI Tool hangs and AHT shows no errors.

Already changed Airport Card, RIO Board, RIO Flex, no luck.

LD indicators are missing, but board doesn't show any signs of LD. If it was cleaned, it was cleaned properly. No corroded parts or any other hint.

Does anybody know some usual suspects for this?

BR!

 

[dr. moast]

Hm, just checked on another A1502 and found Airport Proximity always shows 129°C. So this shouldn't be the problem. But still, fan is running high. SMC Reset and PRAM Reset already done btw.

 

[dr. moast]

Checked HWMonitor again. PECI SA shows fluctuating readings between 0 and 40 °C. Any idea which sensor that is?

 

[aprendiz]

Check R5134...

 

[dukefawks]

What error does built in diagnostic give? Hold down D and turn it on.

 

[dr. moast]

AHT gives no error. Will check R5134 on monday

 

[dukefawks]

If there are no errors then there is no need to check R5134. Did you really run diagnostic? It must at least give a fan error.....

 

[dr. moast]

No Title

No errors. Only error is that MagSafe was not connected.

I found a little corrosion around U7320 and replaced all bad looking parts around it. Also replaced Q7310 as it was not looking too good.

Still the same.

 

[dr. moast]

Figured PECI SA must be a sensor on the SSD, as the fans don't run high when the SSD is removed and also another device shows the same symptoms when this SSD is installed. Will replace the SSD and update the thread.

 

[dukefawks]

Is the SSD from a 2015 model?

 

[dr. moast]

No actually it is from a 2014 model.