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Sennheiser remote/cordless headphones are ordinarily very dependable. From your description it sounds like the problem is with the base unit. Try power-cycling the base with the headphones sitting on the charger cradle (red charging light must be on when you do this) - Unplug the power cord for about 10 or 15 seconds then plug it back in. This action should cause the base and the headset to go through the automatic pairing process. Once the base is paired with the headset, it should begin working again. Check also the channel pushbutton on one of the headphones. Hope this helps!!
Here's what Plantronics tech support had me do to fix this problem:
Step 1: Push and hold the on/off button and without letting go insert the charger and you will see a steady light on the headset
Step 2: Let go of the button as soon as you see a steady light on the headset
Step 3: Unplug the charger from the headset, Reset should be done by now and you will be able to turn them on again.
After Step 3 I plugged it in again (I probably could have simple skipped step 3 altogether), because my headphones were completely dead and needed to charge for 3 hours before they were ready to use again.
I had the same problem but instead of a red light it would flash green twice and stay off. I could not find the original charger and another plug in charger would not work. I plugged it into my computer with a usb cable and after several seconds it started charging.
This might work if you aren't using the ORIGINAL charger. I had this problem when my cat chewed through the original Motorola charger. I figured my Blackberry charger would work fine, but it didn't. I then discovered that my Blackberry charger was 700mAH and the broken charger was only 550mAH. When I found another charger with the proper power it charged. I also found that it worked when plugging it into my computer with a standard mini USB. I hope this helps.
It sounds as if you are plugging the base into a standard headphone jack located on the Television set.
RCA Headphone jacks (incl mini) automatically stop the sound output to the main speakers on almost every set I have seen.. or home stereo.. etc etc
In other words you can take a standard RCA jack.. with nothing connected to it.. plug it in while the music or sound is coming out the main speaker.. and it will cut off the output to those speakers..
If you set has audio outputs on the back.. preferably Fixed Audio Out .. you will need to connect your base unit to those.. turn your set volume to 0 and adjust the headset volume using the control on the right ear-cup.
If you have variable audio out.. you will need to go into your TV sets setup menu.. turn off the speaker.. and turn up the set until you achieve a signal and decent volume through the headset.
If you are missing these connections..your current “work around” is your only solution.
I just hooked it up with a usb sync cable to my computer. It was installed and ready to use and the charging light came on. Seems like it is charging as the led went from red to yellow, and it does turn on now. However, it still does not work with the usb cable plugged into a wall charger. If this solution works for others having the same issue kindly post your results.