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Hi , I`m JackPerhaps I can help you with this problem but first I must say that I`m not surprised you did not find any buttons for that and I guess you are using this tv as a monitor ??
For your pc ?
O.k then and i take it that the picture is too dark .
Is this a new tv that you are setting up or it stopped working correctly all of sudden ?
The bright ,contrast and backlight adjust are found in the TOOLS menu
Press that button on the remote and in the PICTURE menu there will be presets mode you can try then in the ADVANCED settings menu there will be other adjust but your tv needs to be set to standard or movie mode
To make a long story short , the button you were looking for is actually in the PICTURE menu that you can access with the TOOLS button on the remote .
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What is happening anyway ?
Picture too dark ?
Did you try the various presets modes like Dynamic, movie, standard etc. ?
Set your tv presets to STANDARD then scroll down to ADVANCED SETTINGS , once in there turn OFF the MOTION LIGHTING option and also check and adjust DYNAMIC CONTRAST and BLACK TONE