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SB6190 modem not working. no lights working. Bought new July 2023. It is still under warranty, please replace! thanks

You’d need to open a support case with arris. The community support forums won’t be able to get you an rma. only official support

https://arris.my.salesforce-sites.com/consumers/ConsumerProductSupport


As you mentioned, no led lights on the modem, I suggest you to check with different power cord and different outlet.

Also perform factory reset the modem to check any changes on the modem’s behavior.

http://arris.force.com/consumers/articles/General_FAQs/SB6190-Factory-Reset