Display dim, internal temp is above 55°C (131°F), Thermal dimming


  • Galaxy display is dimming during hottest times of the day, internal temperature is above 55°C (131°F).
  • Display is dimming down then brightening back up, then down again, but photocell is functioning properly.


  • Galaxy M2 controlled Message Center


  • Display internal temperature has reached 65°C (148°F) and as a normal protective operation of the controller it has dimmed to its lowest visible value until internal temperature reaches low trigger point of 55°C (131°F).


  • Resolve any ventilation issues.
    • Ensure all fans are functioning and clean/clear of debris.
    • Ensure all filters if present are clean and in good condition.
    • Remove anything that may be blocking or inhibiting proper ventilation (ie. plexiglass).

KB ID: DD3668243

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