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Z390 DARK vcore - Status LED - Need sanity check

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Zeddivile
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2019/04/28 12:09:53 (permalink)
Hi,
 
I thought I remembered that the vcore status led was lit on post. I recently noticed that on my bench the vcore status led is no longer lit. Its driving me crazy.
 
posts fine and vcore is reporting on prob-it and dbugport display.
 
I checked here https://xdevs.com/guide/e399ocg/#diagled for reference and did not find anything.
 
and on closer inspection I noticed that vcore led in the status led row is different than the other leds in both the marketing images and on my bench.
post edited by Zeddivile - 2019/04/28 12:42:26

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"This stuff breaks my tiny often dehydrated and carb deprived hamster brain"
 
 
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    TiN_EE
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    Re: Z390 DARK vcore - Status LED - Need sanity check 2019/04/28 20:03:19 (permalink)
    VCORE led may be dim/blinking depends on the load. Run some CPU test and check if it's come back steady on.
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    Zeddivile
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    Re: Z390 DARK vcore - Status LED - Need sanity check 2019/04/28 22:36:26 (permalink)
    @TiN_EE
    Thanks for chiming in.
     
    I'm not sure specifically as to which tests. So I just RAN CB15 ~10 times, Prime95 with AVX for 30 minutes and pushed 220~watts through the 9900k with AIDA64FPU/CPU stability for ~15 minutes, the VCORE LED did not even blink.
     
    This above testing was run at 5.2GHZ, RR47, 1.35V-1.40V Vcore
    Peak temp 78c on an open bench - Chiller
     
    Totally DARK heh.
    Flashed BIOS from 1.03 to 103,1.04, 1.06 - Same behavior
    Removed all power connectors from board - Same behavior
    Switched to another Trident Z Bdie kit - Same behavior
     
    Unfortunately I didn't have another 9 series intel cpu to test. I guess Ill order another 9900k and see what happens when it gets to my doorstep if still no vcore LED after that. I guess my next step is RMA Z390 Dark.
     
    CPU shows no issues. CPU still Clocks to 5.4 @ 1.4v and passes CB15 just as before I noticed the vcore LED behavior.
     
    To be clear. LED does not blink and is not dim. it is not lit as though no power however
    DMM shows 3.33v on ram side of led and 1.96v on X side of LED -edge
     
    the rest of the status leds show on DMM
    2.54 on ram side and 0.00 on X  side - edge
     
     Edited to add that the dip in watts in image 2 is due to AIDA64Cache stability testing which I turned on and off during the stress test.
    post edited by Zeddivile - 2019/04/28 22:40:20

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    "This stuff breaks my tiny often dehydrated and carb deprived hamster brain"
     
     
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    TiN_EE
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    Re: Z390 DARK vcore - Status LED - Need sanity check 2019/04/28 23:25:09 (permalink)
    Maybe you got lucky and it's dead LED :) I wouldn't worry about it too much, as if there is no VCORE you would not have a working CPU.
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    Zeddivile
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    Re: Z390 DARK vcore - Status LED - Need sanity check 2019/04/29 09:37:00 (permalink)
    @TiN_EE
    Sounds reasonable and stoic, unfortunately issues with obsessing on every detail working as it should will not allow me to ignore. Ordered another 9900K just to test and for peace of mind. I have big plans for this board and would regret getting all setup for a sub zero run only for this seemingly non issue to manifest as a bug when really pushing the hardware.
     
    Do you mind sharing a full circuit diagram? If not how about redacting the super secret DDR related layout. I am really just interested in exactly how the Vcore LED gets its power and am time constrained with regards to RE'ing the circuitry.
     
    @anyone else with a z390 Dark.
     
    Could someone please check the voltage reads at both sides of the VCORE LED located in the status LED row near the ATX 24pin connector?
     
    Also has anyone else experienced this behavior with the vcore LED not lighting up at all?
     
    Thanks,
    post edited by Zeddivile - 2019/04/29 09:43:42

    "This stuff breaks my tiny often dehydrated and carb deprived hamster brain"
     
     
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    tjohnston3
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    Re: Z390 DARK vcore - Status LED - Need sanity check 2019/04/29 10:41:46 (permalink)
    I got my Z390 Dark on 1/18/2019 and that 2nd led has never been lit up for me. Running @5ghz but can do 5.2 easy, I can post a pic and my vcore when I arrive home, if needed.

    Case: Thermaltake Core X71 Tempered Glass Edition
    Motherboard: EVGA Z390 Dark 
    CPU: Intel Core i9 9900K @5GHz
    Cooler: EKWB custom loop

    Sound Card: Sound BlasterX AE-5
    RAM: G.SKILL TridentZ 3200 2x8 CAS Latency 14
    GPU: EVGA RTX 2080Ti FTW3 Ultra, Hydro Copper
    PSU: EVGA 1000W G3
    SSD: Samsung 512GB 860 Evo 
    OS: Windows 10 Pro 64-Bit
    Monitor: Dell S2716DG 144Hz G-Sync


     
     
    #6
    Zeddivile
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    Re: Z390 DARK vcore - Status LED - Need sanity check 2019/04/29 13:31:57 (permalink)
    @tjohnston3
     
    Thanks for info much appreciated. Now that I know I am not the only one. Maybe my subconscious just wanted a justification to purchase more 9900k. I tend to get a little weird after multiple late night OC sessions.
     
    Still curious as to what the deal is with the voltage on each side of the LED.
     
     

    "This stuff breaks my tiny often dehydrated and carb deprived hamster brain"
     
     
    #7
    TiN_EE
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    Re: Z390 DARK vcore - Status LED - Need sanity check 2019/04/29 19:17:20 (permalink)
    Do you mind sharing a full circuit diagram?

    I've choked on my lunch, Vince had to reanimate me.
     
    But I'd love to see your reverse engineering approach, go for it. It's schoolbook circuit though for the LED, no rocket since hidden in indicator LEDs there.
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    Zeddivile
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    Re: Z390 DARK vcore - Status LED - Need sanity check 2019/04/29 19:51:18 (permalink)
    That makes Vince the KN|GHT K|NGP|N
     
    -- Shameless and timely Game of Thrones reference. In this exercise I will play Jon Snow who "knows nothing."
     
     
    It would be the least time consuming and easier for me to purchase another CPU and observe the behavior of both CPU's on the Dark and another Z390 with a CPU V LED. Which is why another 9900k is arriving tomorrow. Ugh and now a ROG MAXIMUS XI APEX. THE HORROR...
     
    Ill go purchase the Advanced RMA and extended warranty for my EVGA gear while i'm at it.
     
    I appreciate your input and got a good laugh out of the previous response. Obvs im here to learn and am EVGA/TIN/K|NGP|N fan.
     
    Zeddi
    post edited by Zeddivile - 2019/04/29 21:32:12

    "This stuff breaks my tiny often dehydrated and carb deprived hamster brain"
     
     
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    Zeddivile
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    Re: Z390 DARK vcore - Status LED - Need sanity check 2019/04/30 07:58:46 (permalink)
    @TiN_EE
    I rechecked https://xdevs.com/guide/e399ocg/#diagled and found it very informative. Thank you for updating or if I missed it and that section was always there i feel dumb and still thankful.
     
    It appears that I miss identified the CATTR LED as VCORE LED in the status LED row. Yes I am pretty stupid but can reconcile my ignorance with dreams of HOF glory.

    Also choosing to blame some of my ignorance on a stomach bug and dehydration.
     
    It is funny to think that if I did get that LED to light up most likely I also would have killed my CPU. hahaha
     
     
    post edited by Zeddivile - 2019/04/30 08:27:30

    "This stuff breaks my tiny often dehydrated and carb deprived hamster brain"
     
     
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