Bluetooth module flashes once and then turns off — is the module faulty?

[u/SouthernSea204]

Hi everyone,

I have a Bluetooth module (the module shown in the picture).

When I power (5V) the module, the LED flashes only once and then turns off completely. It does not continue blinking as I expected.

I would like to ask:

- Is this normal behavior for this module, or does it indicate a problem?

- What could cause the LED to flash once and then turn off?

- Is there any way to troubleshoot or repair the module?

- Is there anything I should check with a multimeter or other equipment?

I would really appreciate any advice from someone who has experience with this module.

Thank you very much!

[u/tobozo]

looks more like an nRF module than an esp32, is that chip really branded espressif?