Hello Egzondibra,
Good day. Thank you for your question.
Please refer here for the LED behavior descriptions-
https://wiki.teltonika-gps.com/view/FMB120_LED_status
As for the LED not lighting up completely, if the Navigation LED is turned OFF then this would mean that the device is not working or it's in sleep mode. If the Status LED is OFF then the device is not working or is in boot mode. However, a thorough analysis is required to find out why the LEDs are not working since the tracking is working fine. Therefore, kindly reach out to us via the VIP Helpdesk or contact your Sales Manager/Distributor.
If you don't have any contacts with our Sales managers, please contact them on our official website
https://teltonika-gps.com/ and click on the "Contact Us" button. When you will click, please fill the form and submit it.
Note: as a topic, please choose "Vehicle telematics" or you can send an e-mail with the description of your situation to info@teltonika.lt
Thank you for your understanding.
Kind regards.