I have had a Khadas Tea since the beginning of March 2023. It worked well with my i-phone 14 for a time but has stopped putting out any audio. This is true both when using the provided USB C- to Lightning cable and with the bluetooth connection. I also tried using the provided USB C-USB C from my computer to the TEA but still no audio from the headphone jack. I have tried several sets of headphones including HiFiman Ananda’s, 7HZ Timeless (IEM), Sennheiser 660s and none work on the TEA but they all work with other amps. All of these headphones previously worked with the TEA. It stopped working about two weeks ago and I have tried troubleshooting in a variety of ways by using other cables, USB connectors and a variety of headphones. The unit is charged fully and shows.
What do I need to do. HAs there been a firmware update that I should be using?
Let me give you a few status reports…
When charging and using the Khadas provided USB C to USB C charger, the red light comes on until it is fully charged. Then the light goes off. So I know that the USB C port is working and that the light is functioning as it should for charging.
When using the USB C to Lightning to connect the TEA to my iPhone 14, the blue light flashes slowly and then rapidly. However, no sound will come out of the headphone jack. The music plays on the iPhone speaker instead. During that time the two buttons on the side of the TEA will not change volume or track. the only button that works then is the power on/off at that time. I have also tried a couple of other USB C to lightning cables to see if that is the problem. They all give the same result. It is not the cable. I have also tested the original cable on other devices and it works.
Then when I disconnect the USB cable and try to use bluetooth: I turn off the TEA and then restart it holding the power button for 6 seconds until I get the flashing blue light. Then I go to settings on my phone and connect to the TEA. When I do that, the TEA changes to a slow green flashing light and the music stops playing fro, my phone’s speaker but nothing is coming out of the TEA’s headphone jack. I have tried it with multiple headphones that have worked with the TEA before. I can see that the music is still playing on my phone’s screen (but no sound) and I can also see that the bluetooth is connected to the TEA on my phone. Still no sound and the volume/track buttons do not work. The green light is still slowly flashing on the TEA.
Unless there is a way to reset or a firmware update that will fix this, the TEA does not work. What can we do?
PS The unit has never been dropped, never been wet, and the case is in perfect condition. I have also looked to make sure that there is nothing in either the headphone jack or USB port. The unit just stopped working.
Hi
I have received your tea,when I connect to our PC by USB C cable,and check the PID and VID by ESS burner,and find the PID and VID of the tea is wrong.The right PID and VID is 3353 and a005.The picture is shown below.
The reason is that the firmware is missing. If you encounter the same problem next time,you should update the firmware again.The method is following below.
That is strange. The unit worked for a couple months and then stopped working. What would cause the firmware to go bad? Also, I use an apple devise so I use a usb c to lightning cable. Is that what you are using/testing? Also, I did not send back my original box. Do you think you could be looking at someone else’s unit?
In any case, if it’s working, will you be shipping it back?
