Direct answer
HDR uses separate picture controls and preserves dark creative intent, but power saving, room lighting, wrong HDMI format or an inaccurate mode can make it unusably dim.
What this covers
- The observed symptom matches this record
- Customer-accessible settings, connections and external components
- Diagnosis before reset, deletion or component replacement
What it does not cover
- ×A model-specific error code with a different documented meaning
- ×Internal electrical, battery-cell, gas, refrigeration or sealed-component repair
- ×A guarantee that every model exposes the same control label
Capture the exact symptom
ReversibleConfirm the TV reports HDR and compare the same scene in a dark and bright room.
Run the smallest isolation test
ReversibleDisable power/ambient-light saving for one test, use the accurate HDR mode and verify the HDMI port’s enhanced format if external.
Correct only the proven cause
ReversibleKeep an HDR-specific mode with appropriate tone mapping; do not copy SDR brightness values blindly.
Verify before changing anything else
ReversibleRestart the title and verify highlights remain detailed without crushing all shadow detail.
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 before resetting anything?+
Confirm the TV reports HDR and compare the same scene in a dark and bright room.
What is the safest isolation test?+
Disable power/ambient-light saving for one test, use the accurate HDR mode and verify the HDMI port’s enhanced format if external.
When should I stop troubleshooting?+
Service is appropriate if every source is dim, the backlight flickers or one panel area is dark.
Answer for the exact device and software version shown above.