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Repair information, service guides, and replacement parts for Sennheiser headphones.

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Sennheiser HD 450bt Malfunction?

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?

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I have the same issue. Not to many YouTube tutorials to see the fixing on this ones

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Hi @valialexandru

Try a power refresh and check if that resolves the problem.

Open the headphones and disconnect the battery from the board then press and hold the on/off button for 20 seconds and release.

Reconnect the battery to the board and turn on the headphones and check if it all works OK or not.

Whilst the headphones are open, inspect the board for any signs of corrosion or other damage to the board's components.

Here's a video that shows how to replace the battery that shows how to open the headphones

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I disconnected the battery, then reconnected.

It worked. But once I sealed everything back, the problem came back.

Is there a permanent solution to this?

Do I need to reset it once I get it tonturn on after disconnecting-connecting the battery?

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lacie will be eternally grateful.
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