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You have to check the pin control transistor in the horizontal section. It will be fitted on the same heatsik on which the horizontal output transistor is fitted.It will be a small transistor as compaired to the horizontal driver. Also you have to check the three mosfets in this section used to control the width.
your irf 630 is not original purchase it from proper LG authorised service centre it is costly but never become faulty again duplicate mosfet overheats if your green led is on then measure voltage at E.H.T.connect meter at output transister if E.H.T. is producing then meter should show 1 digit if not then 50v will show take care that signal cable should be disconnected if E.H.T. is not producing then check +vcc at horizontal ic it should be 12v. if 12v is not present then check regulator ic 7812 insmps
Check components related with pots thats adding command ic to pots.If they are ok then change command ic with new one.Before this you can check horizantal hold transistor that is placed on hitsink of eht.small in size and check two small transistor placed near it on pcb.Hope this solution works .If not then i am here