T420 turns off by itself in the presence of magnetic field

Hi forum,
I am currently experiencing a problem where my T420 would turn off by itself when it is being used in an environment with the presence of magnetic field (something like a aluminium smelter). It only happens when the monitor is tilted at an angle other than 80~90 degrees. Could this problem have something to do with the lid sensor? Does anyone know where about the type of lid sensor a T420 has and the about location of it? Thanks in advance!!

Thanks for the reply guys!
I have changed the settings (both the power settings and the windows settings) of the lid close events to "do nothing". It stops the laptop from going to sleep mode however doesnt stop the screen from turning itself off. I supposed it is designed to turn off the monitor anyway because designer probably thought there is no point to leave the screen on if the lid is closed. Anyway what we will try now is to connect an external monitor and see if it solves the problem. I will update my progress.

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T420 turns off by itself in the presence of magnetic field

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