NUC's ring LED goes red

[VietNguyen]

Hello,

I have a NUC7i5BNH. Recently the fan noise was too much so I opened the NUC to remove dust from the fan. After that I turned the NUC back on, everything (the fan, SSD, RAM, Wifi...) still works but now the ring LED goes red color, even when the NUC is not turned on (normally it's in blue color and when the NUC is off then it should be off as well). I captured a video of it here:

https://imgur.com/O8djnfM

Here is a picture of the ring LED's cable in the board: https://imgur.com/zDbZo1x . I think I plugged it in correctly. So far I've tried to remove/switching RAM/SSD or plug the NUC into different outlet in the house but that didn't help.

So can anybody tell me what is happening please?

[LeonWaksman]

Hi @VietNguyen 

1. Power ON your NUC and while you see the Intel NUC logo, repeatedly click on F2 to enter BIOS settings. 

2. While in BIOS, click on F9, followed by "Y" to set BIOS to default settings.

3. Click on F10 followed by "Y" to save settings and exit to Windows.

4. Check the ring color.

Leon

[VietNguyen]

Hello, I tried that but the issue is still not solved. The ring LED color is still red, even if the NUC is shut down. I tried to change the ring LED from power state indicator to HDD activity to SW control but nothing changed too.

[ClariceStarling]

That's so cool ... why would you want to change it?

[VietNguyen]

Your comment made me laugh sir. Actually I'm just a normal user, so seeing that light turning from blue to red made me panicked that I might have done something stupid when I was opening the NUC. That's why I want to change it back to the way it was.

[n_scott_pearson]

I believe that you can choose the color from BIOS Setup. Have you checked the settings?
...S

[VietNguyen]

Yes, I tried that too but that didn't help. All the time I didn't changed any settings related to this LED, I even reset the BIOS settings to default as suggested by Leon. 

[LeonWaksman · Accepted solution]

Hi @VietNguyen 

The ring LED is fed from Front Panel LED ring connector. See item "C" on fig. 12, page 46 in Technical Product Specification.  The cable consists of 4 wires: 5VDC and three wires for color control - Red LED, Green LED and Blue LED. See Table 19, page 50 in the Technical Product Specification.

Please check if the connector is fully connected, if the contacts are clean and not skewed and if all three color controlling wires are connected.

Leon

[VietNguyen]

Hello @LeonWaksman , I feel so glad that I asked here first. My issue is now solved, the reason is that I misplaced the ring LED connector to the CEC header. Thank you very much for your help.