Direct answer
When a TV function works on another input, app or source, isolate that signal path before changing the whole television. For phone-to-TV screen mirroring, first place both devices on the primary network and test photo/screen mirroring outside a protected video app.
What this covers
- phone-to-TV screen mirroring with this exact failure state
- Diagnosis across protocol support versus Wi-Fi isolation and source app restrictions
- Customer-accessible observation, settings and external components
What it does not cover
- ×A displayed manufacturer error code with a different documented meaning
- ×Live electrical, sealed-system, internal battery-cell or gas repair
- ×A claim that every model exposes identical controls
Capture the exact failure state
ReversibleName the failing input, app or source and one that still works. Expected behavior: discover the receiver and maintain a local peer or LAN session.
Isolate the component boundary
ReversiblePlace both devices on the primary network and test photo/screen mirroring outside a protected video app. Swap only the source, HDMI path, app or account while keeping the display and network unchanged. Boundary to separate: protocol support versus Wi-Fi isolation and source app restrictions.
Correct only the proven cause
ReversibleEnable the matching AirPlay, Cast or Miracast receiver and remove guest isolation. Repair the isolated source, app session, cable path or format mismatch.
Verify and stop safely
ReversibleRetest both the failing and known-working source after a full restart. Do not weaken router security or bypass protected-content restrictions.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Exact questions
Common follow-ups
What should I check first when phone-to-TV screen mirroring has this problem?+
Place both devices on the primary network and test photo/screen mirroring outside a protected video app.
Why not factory-reset immediately?+
The useful boundary is protocol support versus Wi-Fi isolation and source app restrictions. A reset can erase state without proving which side failed.
When should I stop troubleshooting?+
do not weaken router security or bypass protected-content restrictions.
Answer for the exact device and software version shown above.