See the procedure described here to reset the device Bluetooth pairing: https://community.fitbit.com/t5/Charge-3/Charge-3-is-not-pairing-with-Bluetooth/m-p/3354691/highlight/true#M50473
It is most likely a PSU failure and/or some capacitor blown. You need a multimeter and a new PSU (like this: https://www.ebay.co.uk/p/5007142744), or if you have a configurable power source you could use it to verify that the problem is the PSU.
Find an authorized center here: https://www.fluke.com/en-us/support/service-center-locations Or if you are in Australia: https://spares.bigwarehouse.com.au/index... Another online shop: https://www.myflukestore.com/category/fl...
