XPS 15 9500, Skin Temperature Sensor Failure?

Thermal sensors would be incorporated onto the motherboard. Ensure the BIOS and thermal chipset drivers are up to date. If still unresolved, then you would want to look into replacing the motherboard. If the unit isn't shutting down and you aren't having any other thermal issues, then you should be fine to skip out on this. 

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No, never saw anything like that with my XPS-15_9520.

Try Thermal Fan-Profile in BIOS ... COOLer with more Fans.

https://www.dell.com/community/en/conversations/inspiron/inspiron-16-plus-7620-heating-issues-with-my-i7-12700h/66a9462a40d71075c416c5c5?commentId=69d1747c9627a53db16bc0d3

@Tesla1856​ great idea, but no dice.  There must be a faulty sensor on the mobo.

I've had CPU-Z running for an hour with the system maxed out, and it hasn't triggered the error that appears in the BIOS test.

Again, thanks for the suggestion.

Try HWiNFO64. If the CPU, GPU or chipset package is not overheating ... I would not worry about it.

Hey, when you took the back cover off ... did yours have a thermal pad by the (IIRC) battery connector power-converter that transfers the heat on it onto the metal back cover?

You obviously saw how it's built ... it's built like a phone inside ... the motherboard is actually fairly fragile.

Are you referring to the item I'm pointing to in this pic or one of the items closer to the CPU?  I'll upload another pic in a follow-up message.

I'll post about that later, but for now ... read-again my post above about HWiNFO64 (and @DELL-Daniel V posted something similar). It might just be an anomaly or false-positive in the ePSA Diag Test (maybe for only the XPS-15_9500). It was the first with the new design in the 95xx series.

@NotD3LL​ ,

Are you referring to the item I'm pointing to in this pic or one of the items closer to the CPU? 

On second thought ... I'm sure if you saw a thick-white 1"x1" thermal pad just laying there when you opened it the first time, you would have noted-it and replaced it when re-assembling.

It's interesting how similar the 9500 and 9520 are inside. In that section there, looks like they swapped the screwed-down brass heatsink over closer to the edge of the PCB (where the battery connector is). I would say just go look at the XPS-15_9520 Service-Manual ... but look closely because some of the pics are actually the 9500. Not sure if they forgot to swap them, or maybe they thought no-one would notice.

The two motherboard are only "similar". For one, I just noticed that the CPU and GPU are swapped to different sides on the 9520.

So, this is probably nothing but the angled part PC2828 in the corner of the motherboard (edge for display connector) by the screw ... is it OK? Don't mess with it if it is actually soldered down properly on both ends.

Hopefully you took these pics while it was apart, and it's back together now. Maybe you can check it if you ever have to open it again. I hated opening my 9520. The manual says carefully pry it apart and then it says "don't pry it apart, you might bend it". I used (non-conductive) Noctua NT-H1.

These are very cool laptops but very phone-like inside. Ultra-Complex and fragile motherboards and not really designed to be worked on. They are designed to run crazy-fast, try not melt, and be thin.