Service ManualModel No.: 32D30059-3. Mainboard Failure CheckNo picture but have soundCheck the power outputNoChange the Power BoardYesCheck the CN2 (BLO)Backlight on/offYesNoThere’s something wrongwith FRCVerify if the DC/DCconvertor can output theright Voltage,NoChange the correspondingDC/DCQB3 output 5VYesNoVerify ifQM1outputChangethe QM1YesStill havingproblemsChange PanelChange LVDS wire39