#Help with DisplayPort Monitor Voltage, Resistance Readings

1 messages · Page 1 of 1 (latest)

crisp loom
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Hello.

Can anyone look at the readings I've taken from my monitor and tell me if they're abnormal or could be causing issues in my graphics card? I'm looking for someone to take some measurements on their DisplayPort monitor so I can cross-reference them with mine.

I'm getting a resistance reading of 100 kΩ on pin 16 of my DisplayPort cable connected to an unpowered monitor (Dell U2212HM). Pin 16 is supposedly the ground for the AUX channel (pins 15, 17). It also does not have continuity with the monitor's metal chassis. This looks like unusual behavior for a ground pin to me.

Ground pins 2, 5, 8, 11, and even 19 (DP_PWR RETURN) have continuity with the metal chassis.

Checking the ground pins on two different unplugged DisplayPort cables themselves show that opposite ends of pin 16-16 and 19-19 are connected to each other while 2, 5, 8, 11 are not. I assume 2, 5, 8, 11 are common grounds while 16 is a dedicated ground. Pin 20 on my cable is not wired and does not carry voltage while powered.

The problem: My GPU has been randomly failing to initialize (zombie state) on fresh boots and reboots. Whenever the issue occurs, I get a black screen/no display from the point of the BIOS loading screen but the system POSTs successfully and loads into Windows. Windows logs a WHEA error pointing to my Intel PEG 460D PCIe express root port where a secondary device is not visible. Concurrently, an amduw23g driver loading failure is also logged. One crash has occured since this issue has been occuring for 2 months.

Furmark stress test for 30+ minutes and 1 hour OCCT VRAM test passes with no issues. Hotspot 91 C, VRAM 78 C. Prime95 CPU 63 C.

Driver not found event with every black screen: https://pastebin.com/8dYiv3vt
(the binary in this event translates to [PSP]: Driver Status Reported at FW 1, with version 0x548E2990 status 0x2. FW load failed)

WHEA error: https://pastebin.com/grfBF66W

Minidump: https://pastebin.com/iLkX4mWg

I've tried every BIOS tweak out there and done multiple OS reinstalls and DDU wipes. The display even went out once during system restarts initiated by the Windows installation sequence. Reseated the GPU, cleaned the pins with IPA, driver rollbacks (drivers that didn't give me issues before give me these issues now), buying a Unitek C1628GY01 cable, CMOS resets and default BIOS.

Unplugging the monitor from the GPU for a week while the GPU is still installed, powered, and enabled, I have shifted to the iGPU and connected the monitor using VGA in a dual GPU setup. The errors on my discrete GPU have completely stopped and I can load the drivers and access my metrics in AMD adrenalin flawlessly. The moment I plugged the monitor back in, the GPU started randomly misbehaving again. Sometimes hotplugging DP multiple times leads to a permanent no display from the GPU when there was initially a display, on for example the 3rd or 4th hotplug.

My theory is that because DisplayPort pin 16 is an AUX ground which handles EDID, intermittent link training failures are being caused on the GPU which cause it to zombie out or activate protection circuits. But I'm not sure as I don't have access to a spare monitor or PC. Please help.

System specifications:
Windows 11 Pro 25H2
Intel Core i3 12100
Gigabyte H610M H V2 DDR4 REV 1.0 (BIOS F34)
Corsair cmk16gx4m2e3200c16 RAM 2x8 GB
ID Cooling SE 214 XT
Lexar NM620 1 TB NVMe
ADATA SU650 120 GB
Seagate Barracuda 1 TB 7200 RPM
Gigabyte UD750GM PSU
PowerColor Fighter RX 7600

P.S DisplayPort male pin layouts are difficult to find on the web because the male connector is a 180 degree translation of the female. Wikipedia has the female connector. My Dell U2212HM's manual (available as a PDF on the web) has the male layout. DisplayPort 1.2 documentation: https://glenwing.github.io/docs/DP-1.2.pdf

tulip harness
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I ain't reading allat

kind linden
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nooo

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all this text hurts my head but meh

sullen galleon
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i read it

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they just want someone to test pins on a dp monitor so they can confirm theirs are fine (or not)

crisp loom
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yes

kind linden
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i just cant read

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do you have access to other displays?

crisp loom
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I don't and the shops near me won't let me touch theirs with my multimeter

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they don't understand what a multimeter is

kind linden
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xd

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i sadly do not have any monitors i would rip open but a power thing should not be shorted to ground

crisp loom
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this is a very safe test that I'm doing which just needs a DisplayPort cable, no monitor disassembly needed

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nor does the monitor need to be plugged into the wall (it shouldn't be for a resistance test)

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I just want to know if pin 16 has resistance vs the metal shielding of the cable while it's plugged into a monitor disconnected from the wall

kind linden
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my multimeter aint gonna make contact

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but pretty sure its a monitor issue considering its age

crisp loom
kind linden
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yes

crisp loom
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I usually touch the needle probes I have on those square holes

20260101_1753012.jpg
crisp loom
# kind linden yes

hmm do you think you have any paperclip? preferably not coated with paint but you could check continuity on it to see if it conducts

kind linden
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no

crisp loom
kind linden
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no worries someone else might come by with the right looks and or i would rec trying to get another monitor to try and check for issues with

crisp loom
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ok

tulip harness
stuck dagger
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Your specs are cursed

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But, you have integrated graphics

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So unplug your GPU entirely, and run on integrated for a little bit

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If it still does it, your GPU is the problem

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Simple as

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At a glance though, your readings sound fine

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@crisp loom

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Also if you're going this deep into hardware, I suggest joining All Things Repair (rossmanncord)

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This place is more IT focused than what you're looking into