Hi there i have same problem with no hdmi signals on lg 47ld450za
(via aerial all ok )
i have read your post with interest and would like to ask :
did you use the customer supplied remote to enter the option codes?
or did you have to buy a LGservice remote?
i have tried to enter service mode with press and hold ok on both tv and remote at the same time ,but no luck
once you were in service mode can you please explain how to enter the option codes
i have the service manual but its not clear how to enter service mode
thanks