Just had this happen on my Z590 Dark.  Don't want to tear it down to RMA.  Just going to wait for the Z690 Dark and hope it doesn't happen there as well.

Well I guess I am officially number 28?
 
I did my first build with a z590 ftw in August, and after about a month and a half I started to notice the 2nd digit on the readout becoming faded (mind you if the number trying to display is a number '2', that can fully illuminate. I have tried three motherboards, and all of them, even faded, can fully illuminate a 2. 
 
I should of stuck with the first motherboard, as the first digit area never had any issues at all.
 
The second motherboard was the worst, and both digits became faded in under a week.
 
Third motherboard and current, both digits faded already after over a week. 
 
I'd say this is a pretty common issue if three in a row all have bad LED readouts.
 
I don't OC, normal use. Been PC gaming for twenty+ years. THIS is a first. really don't like having to continue to take apart my PC. I am a loyal EVGA customer but I have my limits. 

akujo
Well I guess I am officially number 28?

 
(editing this after some thought):
You're approximately the ~27th person I've seen post in the forums with this issue...but you just put the tally up to 30, as you've had 3 boards with this issue. I counted someone else who had a FTW and a Dark board with failing indicators as 2 different counts on the tally...so you get 3 counts as the tally is "how many times has the indicator failed on people's boards?" not "how many people have experienced this?". Clear as mud? TLDR: tally isn't people, it's LED failures.
 
Also, none of this is "official" though, as I don't work for EVGA and I'm just trying to keep track of how bad it is for people who find the thread.
 
It isn't a "fix" by any means, but I've decided to turn my LED indicators "off" in BIOS on my 2nd board. It still lights up with the post code during boot, but as soon as it gets past boot, it turns off. I'm just utilizing HWiNFO64 on a second monitor for temperatures.

B0baganoosh
It isn't a "fix" by any means, but I've decided to turn my LED indicators "off" in BIOS on my 2nd board. It still lights up with the post code during boot, but as soon as it gets past boot, it turns off. I'm just utilizing HWiNFO64 on a second monitor for temperatures.

Good idea if you're running separate monitoring software. I thought the only options were to show temperature or show post code, for some reason I didn't realize you could turn it off completely. I use Dark mode which turns all the other mobo LEDs off, but it doesn't impact the post code LED. Unfortunately too late for both my Z490 Dark KP and my Z590 Dark - both failed - but in future I will use that option for sure. Thanks.
 
 

Well… this sucks. I just got home from being away for a month, fixed the cpu and now the Debug LED is failing also. I thought highly of the Z590 Dark still shows 1’s and 4’s but any other number just dies.
much disappointment.

On a side note. Anyone know what the second debug led is for or how to activate it on the Z590 Dark?

@akujo that’s a lot of patience you have there. It has to be a bad batch. Last evga board has has zero issues for 7 years. The z97 Classified, now this Z599 Dark is playing up with less than a month of use.

Kyrog
Well… this sucks. I just got home from being away for a month, fixed the cpu and now the Debug LED is failing also. I thought highly of the Z590 Dark still shows 1’s and 4’s but any other number just dies.
much disappointment.

On a side note. Anyone know what the second debug led is for or how to activate it on the Z590 Dark?

Yup, from the manual;
 
 

Multi-function POST Indicator

This is a four-digit POST code reader, which displays in sets of 7-digit LED. The display can be configured to show data in regular decimal format, or hexadecimal, which means the characters available (when working as intended) are 0-9, A-F and has a cap of 255 characters.   

During POST, the left set of LEDs will display the various POST codes as they cycle through the Power On Self-Test. The POST codes are listed in the troubleshooting section on Page 160.   

After the system boots, these same set of LEDs can be set to display a hardware monitoring sensor, such as the CPU temperature in Celsius. This temperature is specifically for the CPU socket, which will typically read slightly higher than a given CPU core. To read this temp in Fahrenheit, take the value in Celsius, multiply by 9/5 (or 1.8) and add 32.

The display can be used to show additional temperatures, or can be configured in tandem with all 4 digits to provide live readings for voltages or temperatures. For example, the LEDs can be configured to read voltages, such as 1.258 or -55C for CPU temp for when you are using LN2 extreme cooling. Detailed configuration instructions for the Debug Indicator are provided on Page 156.

 
 
Then on pg 156 there's a list and some screen shots - this is what it can do:
 
 

Multifunction LED indicator
 
EVGA Z590 DARK board is equipped with a versatile display to allow real-time monitoring of system status during and after the BIOS POST process. The operating mode can be configured in the BIOS Setup in the Advanced menu, and then H/W Monitor Configuration. The Debut Port Display setting selects the OS display mode. There are multiple modes available:
 
[Temp.] CPU – displays external CPU die temperature sensor readout in real-time. Use this mode to read negative temperatures.
[Temp.] PWM – displays VRM temperature sensor readout in real-time after BIOS POST completion.
[Temp.] SYS – displays motherboard bay temperature sensors.
[Temp.] ATX 6P – display motherboard ATX 6P temperature sensors.
[Temp.] M.2 KEY-M(1) – displays M.2 KEY-M(1) temperature sensors.  
[Temp.] M.2 KEY-M(2)(3) – displays M.2 KEY-M(2)(3) temperature sensors.  
[Temp.] VDIMM VRM – display DIMM VRM temperature sensors.
[Temp.] PCH – displays PCH temperature sensors.  
[Volt.] VCore – displays CPU VCORE after BIOS POST completion.
[Volt.] Memory – displays DIMM voltage for slots (0/1/2) after BIOS POST completion.
[Volt.] VCCIO Voltage – displays I/O voltage after BIOS POST completion.
[Volt.] VSA – displays System Agent CPU voltage after BIOS POST completion.
[Volt.] VCCST – displays PCH PLL voltage after BIOS POST completion.
[Volt.] VCCPLL_OC – displays analog VCC voltage for internal clock PLL after BIOS POST completion.
POST Code – displays only BIOS POST completion.
Turn Off - completely deactivates 80Port LED display
 
The Debug Port Display menu the BIOS Setup allows you to pick specific sensors to be displayed on the 80Port.
 
These temperatures and voltages can also be seen in the BIOS setup window in real-time, for a quick overview.   

The recommended settings to display during overclocking are “[Temp.] CPU” and “[Volt.] Vcore”.



 

 
 

Ah yep. I got all that before, I’ve read the manual a few times times now especially when i was waiting for the board in the mail.
But i’ve just tried the reverse side of it. and i see it uses the other Debugging LED. and turns off the original one. Not the best solution but it works haha

Add my Z590 Dark to the list of POST LED failure. Looks like it is the same as others are reporting. It is the one on the left (closest to the USB/SPI flash port).

Seems that those light blue post indicators are defective concerning Evga Z490/Z590 series... My 3 years old Z390 FTW (red post led indicator) is still working flawlessly