Electrical Laptop wizards - Please help

[Paulo uk]

I Have a laptop that is overheating and the fan controller and temperature sensor are built into the motherboard and are not working - which makes it too expensive to replace. So my plan was/is to make a direct solder connection to the fan from somewhere on the board that provides low enough voltage for the fan so that the fan runs as soon as the laptop is powered up. However, all the low voltage (3.3v) points I can find seem to be permanently live when the laptop battery is plugged in and for obvious reasons I want the fan only to run when the laptop is powered on. I guess I could put an external switch in, but that would be messy. Any thoughts or advice much appreciated.


Paul

[RcRotaryMadness]

hmmm I'm not so gemmed up on laptops but on desktops there's usually plenty of 3.3/5v plugins.

Just keep testing till you find something suitable to go from or see if theres a way to bypass the burnt out bits so that fan just runs all the time and hopefully turns off when switched off.