After Main Board (Motherboard) replacement on a LG TV, picture may be upside down. To fix this, you have to enter LG Service Menu ( • LG TV Hidden Secret Service Menu/Mode with... ) (EZ-ADJUST) and follow the video.
Be very careful while playing with these service menus, wrong value could brick your TV.
How to enter INSTART Service Menu : • LG TV Secret Service Menu with your Smartp...
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tags: flip , invert , picture , upside down , mirror mode , screen flip , display upside down , 180 degrees.