iFixit - Answers With Device "Sennheiser Headphone"

Sennheiser Momentum 4: Left earcup suddenly stopped working

Wed, 13 May 2026 04:42:45 -0700

The left earcup of my Momentum 4 suddenly stopped working. Did anyone had this issue? If so, what was the fix?

⟐ Answered May 13, 2026 at 4:42 MST

Sennheiser RS120: light on transmitter. I am not receiving any light indicator on new ph

Tue, 12 May 2026 22:25:41 -0700

new purchase rs120./ indicator light to show battery charging is not showing red or green

Sennheiser Momentum 3: How do I fix/replace the ANC microphone in the left speaker?

Sun, 26 Apr 2026 06:47:23 -0700

My Sennheiser Momentum 3 gives constant static in the left speaker when the ANC is on, and it is now gives static when the ANC is off as well, just not as much. I understand that this is a common issue with this model. So do any iFixit members have guide to either repair or replace this microphone and the tools/parts needed?

Sennheiser HD 4.50: power button doesnt go in anymore, unable to turn on

Sun, 12 Apr 2026 14:49:49 -0700

After years of regular use and without dropping the headset, the power button no longer works and I have tried opening it up and haven't found how to fix it, any help would be greatly appreciated.

⟐ Commented April 12, 2026 at 14:49 MST

Sennheiser Momentum 4: How to get the wire through the swivel?

Mon, 06 Apr 2026 13:51:56 -0700

This is my very first repair and I know exactly what is wrong but I have to route a wire from the left cup to the right and cannot for the life of me fit a new wire through, even a small ethernet one. Is there some kind of trick to this or am I cooked?

Any help is appreciated

Sennheiser Momentum 4: Headphones randomly turn off

Wed, 11 Feb 2026 21:59:42 -0700

The headphones would turn off at random times. Sometimes, all you have to do is press the button to turn them on. Other times, you have to press the right earcup against something and then turn them on. That's also how they turn on when charging.

Tried:

Factory reset.

Disabling different features in the app.

Dry it with a hair dryer.

⟐ Commented February 11, 2026 at 21:59 MST

Sennheiser momentum 4: Why do I have static noise in my left earcup?

Tue, 20 Jan 2026 05:40:33 -0700

Since I got these headphones I fell in love with with the brilliant sound as well as comfort. But my left earcup started to make some static noise. It started a month ago when my headphones randomly turned off by them selfs.(they still do sometimes) Has anyone an idea what i could do to fix them?(Yes i tried uninstalling everything and setting them back but it didnt work)

⟐ Commented January 20, 2026 at 5:40 MST

Sennheiser RS120: We get the red light, but not the green light, and we get static

Thu, 25 Dec 2025 08:34:08 -0700

WE do not get green light and just static. Is there anyway I can fix this?

⟐ Commented December 25, 2025 at 8:34 MST

Sennheiser Headphone: Replace the batteries in the Sennheiser MTW 2

Mon, 01 Dec 2025 08:36:54 -0700

Hi, repair newbie here. I'd like to know if there are any guides/advice for replacing the batteries in the Sennheiser MTW 2.

I have a pair that I've owned since 2020 and they're still working, but they run out of charge in 10 minutes of use. It's likely the batteries were damaged when I used the wrong USB-C charger to charge them. I recently bought a new charging case for them hoping to fix the issue but it hasn't solved the problem.

As I said I'm very new to this and any advice would be greatly appreciated. I did find this video on YouTube but some comments referred to issues with the suggested replacement battery.

https://www.youtube.com/watch?v=hAvqtjCk...

⟐ Answered December 01, 2025 at 8:36 MST

Sennheiser Headphone: Sennheiser HD 450bt Malfunction?

Fri, 28 Nov 2025 15:19:14 -0700

My headphones seem to be malfunctioning or something? I didn’t get them long ago. I used them this morning and it was fine but when I went to turn them back on it is refusing to pair. Just says power on and flashes a couple times then remains blue. And then I cannot power it back off and none of the buttons seem to work and the refresh isn’t working. When plugged into the audio jack they work fine but unfortunately my phone doesn’t have one. Anybody that can help?

⟐ Commented November 28, 2025 at 15:19 MST

Sennheiser Momentum 4: Headphones won’t pair

Fri, 07 Nov 2025 14:22:17 -0700

Holding down on button won’t make pair sound or device won’t come up on Bluetooth also headphones only turn on when right ear pressed and sometimes disconnects randomly

Sennheiser HD350 BT: ON/OFF button not clicky anymore

Sat, 11 Oct 2025 16:55:24 -0700

My 4 year old Sennheiser headphones started acting weird a few months back. The on/off button is no longer feeling clicky and requires some extra effort to push.

Regardless of push time, in 9/10 cases the headphones enter pairing mode. In the 1/10 cases I pushed the button at just the right angle to avoid it.

Upon opening them, I realised that the actuating part of the button (the electronic bit) definitely is mot as clicky as the volume up one and experimenting with a thin screwdriver bit made me realise it's a game of chance with 2/10 presses entering pairing mode and 8/10 working just right. The deciding factor was pressure. There is no blockage or problem I can identify with the exterior plastic button.

Is there anything I can do to fix it? Part of me doesn't want to accept it but it seems the actuator is soldered and not replaceable without significant investment in equipment.

⟐ Answered October 11, 2025 at 16:55 MST

Sennheiser HD350 BT: Screw deeper than the others stops me from opening them

Sat, 11 Oct 2025 10:12:40 -0700

Hi!
Recently I started working on my headphones as they were stuck in a power off/pairing cycle and I believe the power button is the culprit. While opening them up, I realized my headphones were a bit different from the other guides - the screws weren't coming off entirely (3/4 are unscrewed to the point where turning them makes them "hop" in place) and one of them had a hole of a different size, so small that my screwdriver wouldn't fit.

Upon taking a closer look and digging out some of the plastic to make the hole larger, I realized it is very deep (about twice deeper than the others). Any recommendations on how to approach this?

⟐ Answer accepted October 11, 2025 at 10:12 MST

Sennheiser HD800: Where are HD 800 drivers replacement parts available for purchase

Wed, 01 Oct 2025 20:29:59 -0700

Where can I get HD800 ring radiator dynamic drivers replacement parts

⟐ Answered October 01, 2025 at 20:29 MST

sennheiser hd 4.50: broken female jack, how to fix

Fri, 18 Jul 2025 02:05:23 -0700

The female jack on my headphones are mostly broken. Most of the time there is no sound but if i move the cord to the right place there is quiet sound in either ear, or rarely normal sound in both ears. (if i hold it there) Is there any way I can fix the jack in these headphones so that it works properly? It is NOT the cord/male jack with the problem, I tried 3 different cords and they all have the same problem in these headphones and not elsewhere

(also if questions dont show device its a sennheiser hd 4.50)

⟐ Commented July 18, 2025 at 2:05 MST

Sennheiser Headphone: sennheiser HD 458BT Power button cracked and not working.

Tue, 08 Jul 2025 23:10:23 -0700

My power button is cracked, I opened it up and had a look. Does anyone know what could be done to fix it? Also, could I unsolder the working assistant button and resolder it to the power button place on the circuit board?

⟐ Edited July 08, 2025 at 23:10 MST

Sennheiser GSP 500: Issue with GSP 600 Volume Control – Left Ear Crackling/No Sound

Mon, 23 Jun 2025 08:47:01 -0700

Hi all,

I’ve been having an issue with my GSP 600 headset for the past month. The volume control has started acting up—touching or turning it causes the sound in the left ear to crackle or cut out completely. I could usually fix it by turning the dial back and forth until I found a “sweet spot” where the audio worked normally.

Unfortunately, the issue has now gotten worse. The sound from the left ear has completely disappeared. However, it does come back temporarily if I press down on the volume control really hard with my finger. Oddly enough, I can also get it working if I play audio at a very high volume using a volume booster—but only as long as I don’t move my head at all.

I’ve seen some guides for older Sennheiser models where you could bypass the volume control entirely by soldering a few wires together. The problem is that the PCB in the GSP 600 looks different, and I’m not 100% sure how to proceed without damaging it.

Here is one of the guides for the PC360

https://www.diyaudio.com/community/threa...

I’ve also added a photo of the PCB. I’ve managed to identify most of the connections:

LHB-SN
LHB-SP
L-HB
R-HB
G-HB

These are five small pins grouped together.

There are also two larger wires, but I can’t read the labels clearly because they’re covered in glue. One seems to say something like R-SP..., and the other likely starts with L-SP..., possibly left and right channel connections.

⟐ Edited by author June 23, 2025 at 8:47 MST

Sennheiser pxc 550: My right earpiece stopped working, no more sound

Mon, 19 May 2025 02:16:39 -0700

I have a Sennheiser pxc 550.

I wanted to use it, and realised one of the ear pieces wasn't making sounds. It's the right ear piece. I never connected it trough bluetooth to my laptop, so I was using the wire (the one that came with the headset) The wire goes in the right ear piece, if that matters.

I tried turning the headphones on and off. I connected the headphones trough bluetooth with my phone, still no sound from the right ear. I tried to reset my headphones next, witch didn't work either. I tested with another headphone both my laptop and phone, those work fine.

Does anyone know how to fix this?

⟐ Commented May 19, 2025 at 2:16 MST

Sennheiser HD350 BT: My headphones are not working

Fri, 09 May 2025 12:15:36 -0700

It is not turning on, it shows red light when I put it on charge but it's not turning on and not even showing any light when I plug it out from charge

⟐ Answered May 09, 2025 at 12:15 MST

Sennheiser pxc 550: ANC static when adjusting

Sat, 08 Mar 2025 14:56:25 -0700

So I get static in the left side. It sounds like the static you get when you drag your finger over the needle of a record player. It happens when ANC is on and;

1 I wiggle my ears to adjust them

2 turn the left earcup into the off position

3 adjust the headband fit but only the left side.

4 sometimes just always on

It seems like when the pressure in that side changes it happens. I have opened it up and did not see anything obviously wrong, like bad soldering or worn wires. It makes me think that there is an issue with a mic in the earcup. I also think this because I have used it with only the left ear on but the right behind my ear so I can hear around me with and without the ANC on.

When I opened it up there was the main driver and then four paper covered things around it. They all looked good to me I can upload photos if it would help.

⟐ Commented March 08, 2025 at 14:56 MST