Asrock Z170 Gaming ITX/ac HDMI 2.0 and coil noise

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   Build Specs :
Model Name: Z170 Gaming-ITX/ac
OS: Windows 10 Pro ,Build 10586 ,64-bit
Processor Type: Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz
Frequency: 4008MHz
DDR4_A1: 8192MB 1066MHz (DDR4 2133 ) 15-15-15-36
DDR4_B1: 8192MB 1066MHz (DDR4 2133 ) 15-15-15-36

HDMI 2.0 4Kx2k 60HZ NOT Working and sometimes random lost of Display signal during BOOT and LOGIN
I am using LG 27UD88-W 4K monitor with 2 HDMI 2.0 ports.
I am using HDMI cables provided by LG and also tried Amazon Basics HDMI 2.0 4K but still the same issue.

I tried all the instructions from the multiple forums,

1. Downgrading BIOS from 2.30 to 1.50 version
2. Downgrading VGA driver from 4331 to 4300 version
3. Did the \HDMIFwUpgrader\BobcatAuxISPTool_V2.05 tool and after upgrade it says ISP upgrade successful.

But it is still NOT working.

My motherboard got replace from that day to try it, but still doesn't work.

I also called service center to check the status, but instead I was instructed to try the CUSTOM Display resolution at the Graphics properties, but still doesn't work.  I can use Display Port to get it work but I also want the HDMI 2.0 to be working when I want to use 2 4k monitor.

And another thing I notice after that custom resolution setup, NOW it is having COIL WHINE(NOISE) when it is displayed at 4k/30hz resolution. I have reinstalled the Windows, graphics drivers and bios firmware to troubleshoot but no luck. I have to lower it down to 1080 just to remove the noise.

Is the motherboard defective? I am not hearing any coil noise before with my old mobo.

What else could I do here?
This is a common issue using HDMI 2.0 with this motherboard and still ASROCK do not have clear instruction how to fix this. Its quite frustrating

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ravenchad Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 18 Jun 2016 Status: Offline Points: 6	Post Options Post Reply Quote ravenchad Report Post Thanks(0) Quote Reply Topic: Asrock Z170 Gaming ITX/ac HDMI 2.0 and coil noise Posted: 17 Aug 2016 at 2:33pm
	Build Specs : Model Name: Z170 Gaming-ITX/ac OS: Windows 10 Pro ,Build 10586 ,64-bit Processor Type: Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz Frequency: 4008MHz DDR4_A1: 8192MB 1066MHz (DDR4 2133 ) 15-15-15-36 DDR4_B1: 8192MB 1066MHz (DDR4 2133 ) 15-15-15-36 HDMI 2.0 4Kx2k 60HZ NOT Working and sometimes random lost of Display signal during BOOT and LOGIN I am using LG 27UD88-W 4K monitor with 2 HDMI 2.0 ports. I am using HDMI cables provided by LG and also tried Amazon Basics HDMI 2.0 4K but still the same issue. I tried all the instructions from the multiple forums, 1. Downgrading BIOS from 2.30 to 1.50 version 2. Downgrading VGA driver from 4331 to 4300 version 3. Did the \HDMIFwUpgrader\BobcatAuxISPTool_V2.05 tool and after upgrade it says ISP upgrade successful. But it is still NOT working. My motherboard got replace from that day to try it, but still doesn't work. I also called service center to check the status, but instead I was instructed to try the CUSTOM Display resolution at the Graphics properties, but still doesn't work. I can use Display Port to get it work but I also want the HDMI 2.0 to be working when I want to use 2 4k monitor. And another thing I notice after that custom resolution setup, NOW it is having COIL WHINE(NOISE) when it is displayed at 4k/30hz resolution. I have reinstalled the Windows, graphics drivers and bios firmware to troubleshoot but no luck. I have to lower it down to 1080 just to remove the noise. Is the motherboard defective? I am not hearing any coil noise before with my old mobo. What else could I do here? This is a common issue using HDMI 2.0 with this motherboard and still ASROCK do not have clear instruction how to fix this. Its quite frustrating