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System boots and works normally, but when laptop is working, it becomes warm enough but CPU fan doesn't rotate.
On power-on CPU fan runs for a second and then stops.
I disassembled the laptop, removed and checked the fan - it's rotating when 5V is applied to it.
DC 5 volt on fan connector appears for one second after laptop power-on (and the fan rotates then) and then disappears. Fan doesn't rotate even after I ran the laptop for half a minute without heatsink attached and CPU became hot enough.
What can be checked in this situation?

Please help.

I didn't find the right solution from the Internet.

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