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Roku Streambar troubleshooting

Roku Streambar (9102R): streambar 9102 (from the Wikipedia page); ports; audio and remote, and a fix for each symptom below.

Streambar 9102 (from the Wikipedia page)
Released October 2020 as a 4K-capable soundbar and streamer with HDR10 and HLG.
Ports
An optical input, HDMI 2.0a with ARC and a USB-A 2.0 port.

No pictureNo soundHDMI no signalWi-FiApps not workingRemote not working

Part of Roku tv model troubleshooting

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Roku · AirPlay

Roku Streambar will not AirPlay, Cast or screen mirror

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Which units this covers, and how to tell yours is one of them

Model numbers and patterns: 9102R

Published specification

What is true of this model and changes how you fix it

Device type — soundbar + 4K streamer in one
The Streambar is a compact soundbar with a Roku 4K streaming player built in. It connects to the TV by HDMI (ARC) or optical for audio and outputs its own streaming picture over HDMI. So it is both an audio device and a streamer — a 'no sound' problem is the ARC/optical link and the TV's audio-output setting, while a streaming problem is its own Wi-Fi.
HDR
Streams 4K with HDR10 and HLG (no Dolby Vision on this model). Audio is Dolby Audio with virtual surround and adjustable speech clarity/bass modes in the Roku settings.
Audio routing
For the Streambar to play your TV's other inputs (cable box, console), the TV must send audio to it over HDMI-ARC or optical, and the TV's speakers must be set to the external audio system — a very common 'the soundbar is silent from my cable box' cause.
Audio and remote
DTS and Dolby Atmos support, dual-band MIMO Wi-Fi and a voice remote.

Where these figures were read. support.roku.com/article/set-up-your-streambar (real model 9102 confirmed) + roku.com/products/audio/roku-streambar

Manufacturer support for this product line. Roku Support — Roku support. Official Roku player, Roku TV, remote, network and account support.

Also read for this model. Wikipedia — Roku.

Exact questions

Questions that only have an answer for the Roku Streambar

My Roku Streambar has no sound from my cable box or game console.+

The Streambar plays its own streaming apps directly, but for anything plugged into the TV (cable box, console) the TV has to send that audio back to the Streambar over HDMI-ARC or optical. Connect the Streambar to the TV's HDMI-ARC port (or optical), enable HDMI-CEC/ARC on the TV, and set the TV's audio output to the external sound system rather than TV speakers.