Bluedio T7 Turbine Not Charging, No Bluetooth, Red & Blue LEDs On – Need Help Diagnosing

Hi everyone,
I’m having a serious issue with my Bluedio T7 Turbine Bluetooth headset and could use some help or ideas from anyone who has experience with electronics repair.

Here’s what’s going on:
- The headset won’t charge at all.
- It doesn’t show up in the Bluetooth list on any phone.
- There’s no power-on or pairing voice prompt.
- The speaker makes static/crackling noises and seems to be looping or stuck in some kind of reset cycle.
- I’ve tried pressing the Bluetooth & ANC switch, and ANC shift key many times with no luck.
- Also tried tweaking Bluetooth settings on my phone — still not detected.

What I’ve tried so far:
- I used a bench power supply to directly power the battery terminals (3.7V) & tried powering through the USB-C input.
- When powered this way, both the red and blue LEDs turn on at the same time (which I think is abnormal).
- The current draw is about 300mA, but when I press the ANC switch, it jumps up to around 1.5A.
- I checked for heat, but none of the components (ICs, transistors, etc.) get hot — everything stays cold, even under load.

Has anyone seen something like this before or know what part usually fails on these headsets?

 

Devices that small are usually "intended to be serviced as an assembly." Surface mounted parts closely packed o a brittle PC Board glued into the housing.
The bad news is that "intended to be serviced as an assembly." means it is not repairable and service parts are not available. Possibly somebody else has had a better experience.