I found that the brightness of the "black" bars during Avia calibration is not even from bottom to top when right side of the screen is white. It seems that both bars are brighter at the top and become darker to the middle of the screen. E.g., I still can see both bars at the top of the screen but only brighter one at the middle. It only happens when the right side of the screen is white. When the screen is all black (using another Avia test pattern), the "black" bars have perfectly even brightness from bottom to top. The same with color filed - the screen is perfectly even. Is something wrong with my TV (TH-42PA25)? I have never noticed any brightness problems during normal play (DVD or cable).