Re: LG 42in LG 42LM3700 Not powering on



according all the info showing in this thread, I suggest check following components if you still have that damaged power supply board.

the D605 nearby bridge (+,-,~,~), model number is MUR460AX (4A/600V ultra fast diode). this diode is the key diode between the ac and dc circuit. your voltage lost 24vdc, I believe 12vdc and 3.5vdc lost as well. all the dc voltage is started from this diode.

remove the diode from board and test the bridge first, see if ac 110v-120v in and 170-180vdc send out....