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I Can't Adjust My Monitor's Brightness. How Do I Fix It?

PRISM+ Support teamUpdated 23 July 2026~2 min remaining2 steps

PRISM+ monitors include preset picture modes designed for different uses, such as:

  • Gaming
  • Movies
  • Reading
  • Standard use

When one of these preset modes is selected, the monitor automatically applies optimised display settings, causing the Brightness and Contrast controls to become unavailable.

Steps

  1. 1
    1 min
    1. Press the Menu button (or joystick) on your monitor to open the OSD (On-Screen Display).
    2. Navigate to Picture Mode, Preset, or On-The-Fly Mode.
    3. Select Standard mode.
    4. Return to the Brightness menu.

    You should now be able to adjust the brightness and contrast normally.

  2. 2
    1 min

    If the brightness is still unavailable:

    1. Open the OSD Menu.
    2. Navigate to System or Settings.
    3. Select Factory Reset (or Reset All Settings).
    4. Confirm the reset.

    After the monitor restarts, the brightness controls should be restored.

Still Can't Adjust the Brightness?

Try the following checks:

CheckWhat to Do
Picture ModeSwitch to Standard mode.
HDR EnabledTurn off HDR if brightness is locked while using HDR mode.
Dynamic Contrast (DCR)Disable DCR if available.
Factory ResetReset the monitor through the OSD menu.
Video CableDisconnect and reconnect the HDMI or DisplayPort cable.

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