55LH40, 55LH41, 55LH400С (CHASSIS:LA92B) - LG TV Service Manual (repair manual). Page 21

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C
2009
- 21 -
1. Side effect of OPC Function
A change of Brightness or  OSD Flicker  problem
Check OPC  Status  in the picture-Advanced
 Control menu
YES
YES
This problem  is side effect  of  OPC Function 
1)A change of  Brightness means Backlight dimming is operating  
by dark image because of OPC function
2)A phenomenon of  flicker  a specially bright area is 
Side effect  because of OPC
  function
Recheck  After OPC  Off
YES
Ex1) A change of  total brightness  adding local bright image or caption
<In  excluding 
a caption
>
< In  including  
a caption
>
Ex2)  A phenomenon of  moment  flicker  a specially
bright area after changing channel or input mode
CATV-3
CATV-3
<Before changing channel>
<After  changin g channel>
CATV-2
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