Service ManualModel No.: LE22S6009-3. Mainboard Failure CheckNo picture but have soundCheck the power output No Change the Power BoardYesCheck the J1 CN15 (BLO)Backlight on/offYesNoThere’s something wrongwith FRCVerify if the DC/DCconvertor can output theright Voltage,No Change the correspondingDC/DCQ8 output 5VYesNoVerify if U9outputChange the corresponding ICYes Still havingproblems Change PanelChange LVDS wire38