Chosen Solution
I’m working on a Dell 15” XPS 7590 that is was brought in for intermittently going to the lock screen. Determined the issue is actually that the lid sensor is sending out bad data. It will read for a very short blip that the lid is closed, just long enough to lock the user’s screen, but then will read as open. So the screen will light back up. My issue is, I cannot determine specifically where the sensor itself for this mechanism is. The magnet is in the lower right hand corner of the display bezel. I found some schematics for a similar model which seem to indicate lid data coming in from the fingerprint sensor/power button cable, which is possible due to location. But I can’t say for certain. Anyone seen anything similar?
Hi @flannelist , What is the board number of the motherboard? It seems that when searching for an XPS 7590 fingerprint board, it appears that it shares the same Dell part number as a XPS 9570 i.e. part # OHF75 Usually the lid switch is a hall effect sensor and this is confirmed when looking at the schematics for a XPS 9570. The lid switch is an APX8132AI-TRG SOT-23 3P Here’s an image of the component ID and wiring pertaining to the switch
(click on image to enlarge) Maybe check if there is a component marked UE2 on the board. Update (03/21/2022) @flannelist Looking at p.48 where LID_SW_IN# goes to, it goes from the sensor to the fingerprint board and also to the motherboard IO chipset (southbridge/northbridge - I always get confused) Perhaps check the resistors and capacitor as shown in the image. This is if it is wired the same on your board, but it seems a reasonable assumption
