Article Number: 000134019
The computer is working as intended. Modern laptops use a HALL effect sensor to detect when the LCD is closed and the sensor turns off the display. The sensor is placed into the palm rest and lid of the computer, to engage the sensor when the LCD is in the closed position. The main purpose of the Hall sensor is to turn off the internal LCD, and if present, move the video to an external monitor. If the sensor was not there, the display would not turn off when the laptop lid was closed. It would heat the laptop unnecessarily, you would use more power and you would need to physically switch to an external screen or enter hibernate/sleep mode.
Older computers typically have a HALL sensor that is located along the rear of the computer, between the bottom of the LCD and top of the Palmrest. Whereas most modern computers, have it located along the top edge of LCD and bottom of the palmrest. However, it is easier to think of the placement of the sensor as located somewhere around the edge of the LCD screen and the palmrest.
What happens when your laptop is exposed to magnetic fields from outside sources? The HALL sensor can sometimes contribute to no video issues, random shutdowns, or situations where a computer goes into sleep or hibernate mode unexpectedly. This can occur when an outside magnetic source is placed near the HALL sensor.
These items can include, but are not limited to:
A magnetic field impacting a HALL sensor shows the following symptoms:
G Series, Alienware, Inspiron, Latitude, Vostro, XPS, Mobile Workstations
23 May 2022
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Solution