Check:
Display the test pattern (White) on the screen by operating the “Function Settings” of the OSD menu to check whether non-uniformity is still noticeable.
-> YES: Please send the unit in for repair.
-> NO: Check whether there is any problem in the input signal. (Swap the input cable ports to check whether the non-uniform area also swaps.)
 --> No problem in the input signal: Please send the unit in for repair.