Black screen, no signal on external monitor, fan run highest speed

Hi community,

after putting another screen with his cable on my Acer for testing it, the fan is gone at highest speed and I smelled a burning smell. Soon I've shut down the laptop and have checked the connector lvds that had one pin broken inside. Now, if I power on the laptop, no smell anymore but it doing the same thing: nothing on screen and fan at highest speed. What's happened?

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