Temperature sensor detached, fans at 6000 RPM. Advice?

My MBP 15" recently suffered a GPU failure. I managed to reflow the chip but accidentally tore off one of the temp. sensors (the one closest to the left fan, IIRC). Fan Control app reads -128 degrees C and the fans run on 6000 RMP constantly. iStat reports normal readings (Airport, CPU, GPU etc.).

I'm assuming the fan malarkey is caused by the detached sensor. Correct?

If so, is there a software that allows me to limit the fan speed? iStat and fan control only allow you to adjust the base/min speeds.

I fear my only option is to re-solder the teeny tiny connector back to the motherboard. Hopefully you guys and gals can provide some other solution to my problem!

EDIT: Conclusion: The temp. sensor fault indeed causes the fans to go full speed. I have to try to solder the broken connector back or take the laptop to someone who can.

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Sorry ;-{

SMT components are very delicate! As well as the SMT connectors. You'll need to find someone with the correct tools and skills to reconnect the connector.

Not easy! I did the same thing too on one of my first reflow attempts. I ended up getting a new logic board for the customer.

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By doing the same thing do you mean detaching/breaking the temp. sensor connector? Did you get the same symptoms as me (-> fans at max)?

by Chase

I think it was that way, but it was so long ago I don't remember clearly, only having to suck up the cost of a new board ($$).

by Dan

Ouch. That blows. I have to try the soldering though. I think it might be possible using four small wires to connect it. Soldering directly to the MoBo with my equipm./skills is impossible.

by Chase

+ good answer Dan. Chase, the fan is running at max because the SMC is not detecting the sensor. You could get by with soldering the wires to the MB, as you suggest attempting to do. However, if someone has the equipment and skills to do that, then they can solder in another connector just as easily or even easier. You will have less risk of ripping the solder pads and/or traces off the board. Those temp sensors reference themselves to other temp sensors. Attempting to work around the problem (potentiometer to control fan voltage/speed) could cause other problems, including but not limited to kernel panic. Take it to a TV or electronics repair shop to solder a new connector in. They will have the skills to do that. It is cheaper than replacing the board. Those connectors are made by Foxconn.

by ABCellars

Thanks for the clarification ABCellars! With this, I pretty much know my options. Gotta make some calls on monday, see if a brick&mortar tv-repair store even exists around here anymore. Haha!

by Chase

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Chase will be eternally grateful.

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