Highlight detail can be clipped in the source, during tone mapping or by aggressive display settings. A bright picture is not automatically a detailed one. Compare representative material with sensible contrast and dynamic-processing settings before assuming that maximum brightness delivers the most faithful image.
Find a meaningful reference
A white test menu is not enough. Use clouds, a sunlit curtain or a white shirt with folds where the source should contain texture. Some lights are intentionally captured without detail, so compare several objects and scenes rather than deciding from one glowing lamp in a dramatic shot.
Separate light output from clipping
Increasing panel light output and changing the signal’s contrast mapping are not necessarily the same operation. Menu terminology varies by television. Read the model’s guidance and record original values before adjusting. A control that makes the room brighter may not restore information already pushed beyond the visible range.
Check HDR and SDR separately
They can use different picture modes and mapping behaviour. A setting suitable for ordinary television may not apply to an HDR film. If highlights are lost only in one path, include the source format and active mode in a support report. Avoid copying another model’s calibration numbers without considering the actual screen and room.