An IT technician completes a bezel and lid assembly replacement on a convertible touchscreen laptop. Following reassembly, the internal display renders clear video, and touch inputs register accurately. However, the user reports that wireless network reception drops significantly whenever the display lid is adjusted beyond a 90-degree angle, and closing the lid no longer triggers system sleep mode. Which of the following internal cable routing or component installation oversights is the most likely cause of these combined issues?
- The Wi-Fi antenna micro-coaxial cables were pinched in the hinge assembly, and the magnetic reed switch or hall-effect sensor cable was pinched or left disconnected.Cevap
- BThe display inverter board was installed in reverse, causing electromagnetic interference with the Wi-Fi card and disrupting the lid magnet signal.
- CThe digitizer controller board was connected to an external DisplayPort Alt Mode header rather than the internal USB bus connector.
- DThe main embedded DisplayPort (eDP) ribbon cable exceeded its signal bandwidth rating, degrading adjacent wireless frequency bands.
Cevap
The Wi-Fi antenna micro-coaxial cables were pinched in the hinge assembly, and the magnetic reed switch or hall-effect sensor cable was pinched or left disconnected.
Laptop display assemblies contain several non-display components whose cables route through the hinges into the main chassis. These include Wi-Fi antenna leads (routed to the top of the display housing for maximum range) and the lid-closure sensor (a hall-effect sensor or reed switch that detects a magnet in the base). Pinching the Wi-Fi coax cables in the hinge mechanism causes mechanical strain and RF signal loss when the lid rotates, while a disconnected or pinched sensor wire prevents the system from triggering sleep mode upon lid closure.
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Laptop Display Assembly Cable Routing and Auxiliary Components (Antenna Harness and Lid Sensor)