... :High Voltage!!you must cut off the power supply)***What is A+ grade, A grade, B grade for LCD ... professional in developing and manufacturing LCD screens.You'd better choose one of these brands.Normally,A+ Grade LCD ... dead pixel,so it is best.While A Grade,1 or 2 dead pixel (better)And B grade LCD ... to A+ Grade LCD screen although the price is slightly higher.***What is A+ grade, A grade, B grade for ...