EMI noise from front panel audio-Help appreciated

itsakjt · Jul 14, 2013

I am having a problem. I can hear EMI noise when I plug in headphones to the front panel audio port. It is very low. However, I found out today that when a USB device is plugged to the front panel USB port, the noise increases. I was copying a file to one of my flash drives when I could hear a very disturbing noise. So I opened up the chassis and removed the front panel USB header cable. And the noise was completely gone. To test the motherboard, I connected a different front panel section from an old chassis which has only the USB and no noise was there either with or without flash drive connected. So no problem with motherboard. So I checked my chassis' front panel PCB and it is normal. No damage. I cleaned it and plugged it again and still that noise is there. Anyone got any ideas? Thank you.

Derek12 · Jul 14, 2013

Does the current chassis have a metal ring trought the USB or audio cables? I think the metal or thorus thingy absorbs the EMI but I am NOT sure. Also check if they are shielded.

sneekypeet · Jul 14, 2013

google "ferfite ring", then look where you can buy some locally

itsakjt · Jul 14, 2013

Derek12 said:
Does the current chassis have a metal ring trought the USB or audio cables? I think the metal or thorus thingy absorbs the EMI but I am NOT sure. Also check if they are shielded.

Nope. Just simple wires and a cheap PCB. Thanks for the info.

sneekypeet said:
google "ferfite ring", then look where you can buy some locally

Just did it and I think I can make one myself with those parts from the broken PSUs I've got.

I have seen that they have it.

Thanks a lot, have to try it when I get some time.

sneekypeet · Jul 14, 2013

itsakjt said:
Just did it and I think I can make one myself with those parts from the broken PSUs I've got. I have seen that they have it. Thanks a lot, have to try it when I get some time.

Some of the older cases I once reviewed used to ship with these rings in the hardware kits. Seems it is something that has been improved over the years, but every once in a while,there is the odd system or three that just deliver this EMI issue. I think it will take care of the issues, but if you have a few, run the USB and the HD Audio through two different rings.

Derek12 · Jul 14, 2013

itsakjt said:
Nope. Just simple wires and a cheap PCB. Thanks for the info.

Just did it and I think I can make one myself with those parts from the broken PSUs I've got. I have seen that they have it. Thanks a lot, have to try it when I get some time.

Yeah then add one on the audio and USB wires, that should suppres the EMI interference

EDIT: My older computer (5 years ago) had nasty EMI interference through the BACK audio panel that increased with HARD DRIVE activity or SCROLLING so yes, even newer hardware can have it!

itsakjt · Jul 14, 2013

sneekypeet said:
Some of the older cases I once reviewed used to ship with these rings in the hardware kits. Seems it is something that has been improved over the years, but every once in a while,there is the odd system or three that just deliver this EMI issue. I think it will take care of the issues, but if you have a few, run the USB and the HD Audio through two different rings.

Roger that.

Have to fix a laptop today so I will hunt for the rings tomorrow and it should be a piece of cake installing those.

Derek12 said:
Yeah then add one on the audio and USB wires, that should suppres the EMI interference

My older computer had EMI interference through the BACK audio panel so yes, even newer hardware can have it!

Hmm.

And yes, I was having this issue for quite some time. Even seen a friend's rig with the same issue but he didn't bother.

Today I was really irritated by that noise.

@All- Thanks a lot.

Have some drink. :toast:

Will keep you updated like I always do in my threads.

itsakjt · Jul 15, 2013

UPDATE:
I just ripped off some ferrite rings from old PSUs.

And passed the audio and USB wires through them such that 3 turns were made(can't make more, length of wires limited) and still that noise is there. No reduction also. Is there anything I am missing?

This is a previous photo taken with a good camera.

You can see the cable management and the FP audio(bottom left-rainbow colored) and USB(middle-white) wires. Thanks.

itsakjt · Jul 15, 2013

I FIXED IT! Yaay.

First things first, I was shocked after seeing those rings not sort out the issue.
This was the problem.... I was just gonna post it when the idea came in my mind.

http://youtu.be/18i_0eWM1do

What I did.

I separated the ground between the USB and the audio in the front panel PCB. To my knowledge, they should have different grounds.

Yes, it looks bad.

But this is the result. Beware of some loud Linkin Park near the end of the video.

http://youtu.be/IdfZ80JG2cg

Derek12 · Jul 15, 2013

Strange, I think computers have a common ground for everything but glad it's solved, anyway, leave the rings, they may help a bit

itsakjt · Jul 15, 2013

Derek12 said:
Strange, I think computers have a common ground for everything but glad it's solved, anyway, leave the rings, they may help a bit

Yes will be doing it today night.

System Name	Coffee \| Maximus
Processor	Intel Core i7 9700K @ 5.2 GHz with AVX/4.8 GHz cache \| i7 9700KF @ 5.0 GHz/4.7 GHz cache
Motherboard	ASUS Maximus X Formula \| ASUS Maximus VIII Ranger (modded BIOS for Coffee Lake)+TPM2.0 module
Cooling	Cooler Master ML240 Illusion \| Cooler Master ML120L RGB
Memory	216 GB (32 GB) Kingston Fury Beast @3600 MHz CL17 \| 48 GB (32 GB) HyperX Fury @3200 MHz CL14
Video Card(s)	Zotac RTX 3070 8 GB Twin Edge OC \| Galax RTX 2060 Super 8 GB
Storage	Samsung PM981a 1TB+Crucial P5 1TB+480GB SATA SSD+2 TB HDD \| Crucial P1 500GB+2.5TB HDDs
Display(s)	LG OLED 55 G3, 4K 120 Hz, VRR, ALLM, GSync, FreeSync \| Samsung 43AU9070 4K TV, VRR, ALLM
Case	Corsair Crystal 460X RGB \| Lianli Lancool 215
Audio Device(s)	Creative Sound Blaster Z SE w LG SC9S Dolby/DTS \| Realtek ALC1150 (Supreme FX) w 2.1 speakers
Power Supply	ASUS ROG Strix 750G (80+ Gold) \| Cooler Master MWE 650 V2 (80+ Bronze)
Mouse	Cooler Master MM731 19000 DPI gaming mouse
Keyboard	Cooler Master CK721 65% mechanical gaming keyboard (tactile)
Software	Windows 11 Pro x64 \|Windows 11 Pro x64
Benchmark Scores	Cinebench R20 MT 4200,ST 547 CPU-Z MT 4871, ST 620 \| R20 MT - 4158, ST - 534, CPU-Z MT 4798, ST 603

System Name	Custom Built
Processor	AMD Ryzen 5 3600
Motherboard	Asus PRIME A520M-A
Cooling	Stock heatsink/fan
Memory	16GB 2x8GB Corsair Vengeance LPX 2400MHz
Video Card(s)	MSI 1050Ti 4GB
Storage	KINGSTON SNVS250G 256GB M.2 + 2 data disks
Display(s)	Dell S2421NX
Case	Aerocool CS103
Audio Device(s)	Realtek
Power Supply	Seasonic M12II-520 EVO
Mouse	Logitech MX Master 2S
Keyboard	Logitech
Software	Windows 11 Pro 64-bit

System Name	EVA-01
Processor	Intel i7 13700K
Motherboard	Asus ROG Maximus Z690 HERO EVA Edition
Cooling	ASUS ROG Ryujin III 360 with Noctua Industrial Fans
Memory	PAtriot Viper Elite RGB 96GB @ 6000MHz.
Video Card(s)	Asus ROG Strix GeForce RTX 3090 24GB OC EVA Edition
Storage	Addlink S95 M.2 PCIe GEN 4x4 2TB
Display(s)	Asus ROG SWIFT OLED PG42UQ
Case	Thermaltake Core P3 TG
Audio Device(s)	Realtek on board > Sony Receiver > Cerwin Vegas
Power Supply	be quiet DARK POWER PRO 12 1500W
Mouse	ROG STRIX Impact Electro Punk
Keyboard	ROG STRIX Scope TKL Electro Punk
Software	Windows 11

System Name	Coffee \| Maximus
Processor	Intel Core i7 9700K @ 5.2 GHz with AVX/4.8 GHz cache \| i7 9700KF @ 5.0 GHz/4.7 GHz cache
Motherboard	ASUS Maximus X Formula \| ASUS Maximus VIII Ranger (modded BIOS for Coffee Lake)+TPM2.0 module
Cooling	Cooler Master ML240 Illusion \| Cooler Master ML120L RGB
Memory	216 GB (32 GB) Kingston Fury Beast @3600 MHz CL17 \| 48 GB (32 GB) HyperX Fury @3200 MHz CL14
Video Card(s)	Zotac RTX 3070 8 GB Twin Edge OC \| Galax RTX 2060 Super 8 GB
Storage	Samsung PM981a 1TB+Crucial P5 1TB+480GB SATA SSD+2 TB HDD \| Crucial P1 500GB+2.5TB HDDs
Display(s)	LG OLED 55 G3, 4K 120 Hz, VRR, ALLM, GSync, FreeSync \| Samsung 43AU9070 4K TV, VRR, ALLM
Case	Corsair Crystal 460X RGB \| Lianli Lancool 215
Audio Device(s)	Creative Sound Blaster Z SE w LG SC9S Dolby/DTS \| Realtek ALC1150 (Supreme FX) w 2.1 speakers
Power Supply	ASUS ROG Strix 750G (80+ Gold) \| Cooler Master MWE 650 V2 (80+ Bronze)
Mouse	Cooler Master MM731 19000 DPI gaming mouse
Keyboard	Cooler Master CK721 65% mechanical gaming keyboard (tactile)
Software	Windows 11 Pro x64 \|Windows 11 Pro x64
Benchmark Scores	Cinebench R20 MT 4200,ST 547 CPU-Z MT 4871, ST 620 \| R20 MT - 4158, ST - 534, CPU-Z MT 4798, ST 603

System Name	EVA-01
Processor	Intel i7 13700K
Motherboard	Asus ROG Maximus Z690 HERO EVA Edition
Cooling	ASUS ROG Ryujin III 360 with Noctua Industrial Fans
Memory	PAtriot Viper Elite RGB 96GB @ 6000MHz.
Video Card(s)	Asus ROG Strix GeForce RTX 3090 24GB OC EVA Edition
Storage	Addlink S95 M.2 PCIe GEN 4x4 2TB
Display(s)	Asus ROG SWIFT OLED PG42UQ
Case	Thermaltake Core P3 TG
Audio Device(s)	Realtek on board > Sony Receiver > Cerwin Vegas
Power Supply	be quiet DARK POWER PRO 12 1500W
Mouse	ROG STRIX Impact Electro Punk
Keyboard	ROG STRIX Scope TKL Electro Punk
Software	Windows 11

EMI noise from front panel audio-Help appreciated

itsakjt

Derek12

sneekypeet

not-so supermod

itsakjt

sneekypeet

not-so supermod

Derek12

itsakjt

itsakjt

itsakjt

Derek12

itsakjt