myne wrote on Yesterday, 01:02:

jamesfmackenzie wrote on 2026-08-31, 11:20:

LSS10999 wrote on 2026-08-31, 10:52:

AFAIK no board had ever actually routed LDRQ1# as it's not of any real use for TPMs. However, on most boards LDRQ1# is routed to an unpopulated resistor footprint so you can solder a wire to make it accessible, preferably through a NC (unconnected) pin of an existing header.

You'll definitely need boardviews. Schematics can be of some help but not as much as boardviews, as you still need to manually look at the whole board to locate the footprint in question.

Thanks for the info!

Agree that the boardview is incredibly helpful. For my Z87-PRO it instantly revealed a single pull-up resistor for LDRQ1# (although it's under the PCH heatsink -- but that's another story 😂). Would be great to have the same for the X10SAE -- since it already has PCI slots and would make a great Time Machine. I'm sure there's a resistor or resistor footprint somewhere I could use 😎

Given that supermicro lists pin 20 as ldrq, you might have luck working backwards. Either follow the trace visually and confirm with multimeter, or clip onto 20 and poke empty pads hoping for a beep

The front has some candidates

Thanks for the help! Unfortunately no continuity to either of those from pin 20.

Comparing to other pins, pretty much all the other pins show some measurable resistance to those resistors (500-1500 ohm range). And the top one is directly connected to pin 10.

rasteri wrote on 2026-08-31, 13:12:

jamesfmackenzie wrote on 2026-08-31, 09:19:

Unfortunately the supposed LDRQ pin on the TPM header is indeed not connected.

Is it not connected to anything at all?

Unfortunately no. I've probed just about everything on the board and nothing I can find has any continuity with pin 20. I also probed pin 20 vs:

* TPM +3.3V pin -- no continuity
* SuperIO pins -- no continuity

I also (unsuccessfully) looked for some unpopulated pads with pin 20.

Compared to the other pins: many of those show direct conductivity with SuperIO pins and also measurable resistance with many components across the board.

My hope is that LDRQ is broken out from the PCH to some resistor or pad. But v difficult to find that without a boardview 🙁

https://theretroweb.com/chip/documentation/nc … 71838629925.pdf

Should be pin18.
They're usually connected if only for printers