Lid Sensor for Dell XPS 7590

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Dell XPS 15 Series

Repair guides and support for the Dell XPS 15", first released in October 2010.

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Alisha C @flannelist

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Posted: Mar 21, 2022

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Lid Sensor for Dell XPS 7590

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?

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jayeff @jayeff

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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.

@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

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Board number is LA-H331P, I haven't had any luck trying to find info on it specifically, but I do have what I suspect is the same schematic you referenced. Somehow I overlooked the specific part/ the fact that the sensor is actually on the schematic, even though I was looking right at this same spot (big face palm).

I ended up fixing this, hopefully, just by reseating the cable for the finger print reader, but I would rather be prepared if this comes back because it didn't fix it.

UE2, does look like it's on the board itself and looks like it could be a hall sensor. I have a picture of it on the board because I was trying to just ID parts using the old Google search and I couldn't make out enough of the writing to get any hits on that specific part (no microscope at work). But having another look, the output on this goes 2 places, one of which is to the connector for the fingerprint reader. So this could still be the finger print reader, OR could be the board. Which would be a bummer because this unit is JUST out of warranty.

Mar 21, 2022 by Alisha C

@jayeff Ran out of space on the previous comment so just going to add another one to respond to your update. Yes, that's basically where I was at as well. I might grab this off the shelf before the client comes to pick up and just do some preventative measurements since it does go both places, but reseating the cable from the FPR board seemed to fix the issue.

Had it on and open with the Lid Sensor diagnostic running for about an hour with no hiccups, where before it would just say it passed without me doing anything within a matter of a few minutes.

Mar 21, 2022 by Alisha C

@flannelist

Unless it was a resistive fingerprint cable connection (cleaned when you removed/reinserted it) the only other thing on the fingerprint board associated with the lid switch is the zener diode

FYI, to post a comment >1024 characters, write the comment in full and then cut anything >1024 and submit the first part of the comment i.e. part that is <1024 characters

Then click on Edit in the comment and paste the remainder of the comment under the comment where you cut it from.

Cheers

Mar 21, 2022 by jayeff

@jayeff Thanks for the input. My thoughts were something along that line. Assuming the circuits are similar on my board, the pin with lid data and the pin for ground from the FPR board are right next to each other in the connector. And it seems feasible (although a bit far-fetched) to me that it was getting shorted to ground for tiny blips of time for whatever reason.

It certainly wasn't what I expected to fix the issue, but I'm not going to argue if that's all it is.

Mar 21, 2022 by Alisha C

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Board number is LA-H331P, I haven't had any luck trying to find info on it specifically, but I do have what I suspect is the same schematic you referenced. Somehow I overlooked the specific part/ the fact that the sensor is actually on the schematic, even though I was looking right at this same spot (big face palm).

I ended up fixing this, hopefully, just by reseating the cable for the finger print reader, but I would rather be prepared if this comes back because it didn't fix it.

UE2, does look like it's on the board itself and looks like it could be a hall sensor. I have a picture of it on the board because I was trying to just ID parts using the old Google search and I couldn't make out enough of the writing to get any hits on that specific part (no microscope at work). But having another look, the output on this goes 2 places, one of which is to the connector for the fingerprint reader. So this could still be the finger print reader, OR could be the board. Which would be a bummer because this unit is JUST out of warranty. — Alisha C
@jayeff Ran out of space on the previous comment so just going to add another one to respond to your update. Yes, that's basically where I was at as well. I might grab this off the shelf before the client comes to pick up and just do some preventative measurements since it does go both places, but reseating the cable from the FPR board seemed to fix the issue.

Had it on and open with the Lid Sensor diagnostic running for about an hour with no hiccups, where before it would just say it passed without me doing anything within a matter of a few minutes. — Alisha C
@flannelist

Unless it was a resistive fingerprint cable connection (cleaned when you removed/reinserted it) the only other thing on the fingerprint board associated with the lid switch is the zener diode

FYI, to post a comment >1024 characters, write the comment in full and then cut anything >1024 and submit the first part of the comment i.e. part that is <1024 characters

Then click on Edit in the comment and paste the remainder of the comment under the comment where you cut it from.

Cheers — jayeff
@jayeff Thanks for the input. My thoughts were something along that line. Assuming the circuits are similar on my board, the pin with lid data and the pin for ground from the FPR board are right next to each other in the connector. And it seems feasible (although a bit far-fetched) to me that it was getting shorted to ground for tiny blips of time for whatever reason.

It certainly wasn't what I expected to fix the issue, but I'm not going to argue if that's all it is. — Alisha C

Dell XPS 15 Series

Lid Sensor for Dell XPS 7590

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Update (03/21/2022)

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