N'auriez-vous pas mis le f-Engine en mode DEMO ?
Voir le manuel en pdf => http://www.lg.com/uk/support/product/support-product-profile.jsp?customerModelCode=W2453SQ-PF&initialTab=warranty&targetPage=support-product-profile# notamment en page A19.
Je cite : " This is just for advertising to customer in the shops. It’s setting is same with Movie mode and screen is divided by half."