Join Date: Nov 2006
Location: Burnaby,BC--Sharp LC-37D43U,Pioneer 1018AH,PS3,Toshiba HD-A2,Celestion AVP-301,Jamo SW-1008,DCT3416
This could be the OPC. It automatically adjusts backlight depending on the brightness or darkness of the room so if your lighting conditions change in the room eg. turning lights on or off the screen could dim automatically or brighten by itself. The OPC can be turned off thru the menu options or you can leave it on but adjust the OPC range, minimizing the range will limit how much the screen will dim or brighten, again this can be all adjusted thru the menu options.
Panasonic TH-50PX60U,Pioneer VSX-1018AH,Sony BDP-S350,Toshiba HD-A3,Energy RC Mini Speakers,Klipsch Sub-10,H880,DCT3416