SOURCE: TV Screen Dims during dark Scenes
Most likely you have the opc feture on. go to the menu under picture setting first option should be to turn on or off the opc. turn it of and should solve the problem.
SOURCE: sony bravia dims randomly
There should be a setting in the menu of the TV to turn off the auto dim feature (used for adjusting the brightness of the picture depending on ambient room lighting) I don't have a Sony LCD here with me to walk you through the menu settings, but I am certain it is there somewhere. (Chased this issue for the wife who had the same displeasure you're having)
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At first mine was fine, then after switching from an HDMI cable back to the A/V cable, it does this dimming and brightening as if its trying to amplify the image, but instead it just sucks...
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