Research the following phrase to follow and then as a tech or engineer you know what to inspect for and if found, what to do next.
PS. The phrase is "BAD CAPS"
Hi have a LG42LF7700 LCD TV, its decide to play up, when the power is switched on at the socket the tv starts up by its self but only to the lg start screen, the red light in the bottom right slowly flashes just red, had a quick look inside all caps etc on the power supply board look ok, not tested yet, try tomorrow night, have had a look on the forum for the same fault but no luck, hope i can get some help.
i do do electronics etc in work so parts and testing not a prob but not sure where to start on tvs