2.No picture, but backlight is normal:Yes YesNoNoYes TV有NoNoYesCan control the TV setby keys on remotecontrol or the unit?Do no channelhave picture atall?Enter into factory menu to initializeEEPROM, then cut off main powerand then turn on the TV set again,check if there is picture?Replace the mainboardReadjust themain board.Press key MENU,can OSD displaynormally?