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The TCON board or the LCD panel is faulty. Can confirm by replacing the TCON board.
If you wish to get some details; check the site linked here. Pull up older posts. http://electro-medical.blogspot.com/
Hello. Before you start replacing parts, make sure your connections are correct. It sounds like you have connected a composite source to a component input. Composite is three RCA plugs, a yellow for all of the video, and a red and white for audio left and right channels. Component is five RCA cables, green, red and blue for video, and red and white for audio. if composite is connected to a component input, the picture will be black and white with squiggly lines all through it.
If you are a tech or know something about lcd tvs, lvds connector from main board to Tcon board needs to be cleaned. Connector and flat cables from Tcon to lcd panel are also to be cleaned. Good luck
Tcon board failed check the fuse on the board marked by the letter P on it check it is ok no screen can be the fuse has popped this works in milli amps. if a failing capacitor on main board or on power board it blows the fuse in the tcon board in the middle of the screen back you need to take all boards out and remove the cage mind the cables when doing this. unscrew the 4 screw on the silver case covering the t con board un clip the cables off the screen ( with finger lift the black/brown flaps from cable end up) carefully remove the cables from the tcon board, now looking at the tcon board you will see a row of resistors and one marked with P on it check this. using a meter. should read no resistance and if on buzzer on meter should buzz. if don't buzz, remove the fuse with soldering iron, replace with the same fuse from a nintendo ds they are the same blow rate. before turning on the tv when you put everything back check the capacitors on power board the 16 volt 1000uf check these for damage as this is one of the main areas to cause the tcon board fuse to blow. also on the main board there are 3 capacitors 2 the same size and one that stands up more check these as the power goes to these first before going to the tcon board side. you need to remove them to test them. if any problems with these replace them. when replaced and you have checked there is no faults you can see on any board then turn the tv on. should be fine then.
This may be due to a faulty Timing Control board (TCON board). I had a similar problem with my Samsung LCD TV picture being split vertically down the middle. The image on both halves appeared fuzzy and in reverse (mirror) including the menus. I replaced the TCON board and the problem was resolved.
You cannot test the T-Con bd with a meter. However if you have the luxury of having another same model tv, you can install the bought T-Con bd and see if it is good or bad. Since you said the Menu and channel flashses, then I would replace the Main board.
This could be 1 of a few things here. Without opening up your set and trying to look at voltages or indiciator lights I couldn't tell you exactly without some more info.
Without looking at it myself here are my thoughts and where I would first look at.
It may be a main board because: 1) Main board processes all your audio/video signals. Bad main board means bad video processing. Could do that. Especially if the main board is not sending the right signal or a bad signal to the rest of the boards so they don't do their jobs.
It may be a power supply because: 1) Power supply is well, the power supply. If it's sending inadaquete voltage to the main board you may not be recieving enough juice to keep that main board doing your video processing or further up the line keeping enough juice flowing to your TCon board to keep it telling things where to go and what to do. The power supply sends voltages to your Ballast board(controls your lights) and to your main board through which power is supplied to your TCon board via a LVDS line and a +12/+16V signals. If the power supply isn't pumping out enough juice to keep the TCon or Main Board running, it could be a problem. By the same token it could be that your P/S isn't sending power out to your ballast board.
It could be a TCon because: 1) If the TCon is bad, you won't get your pictures. This could be the TCon board itself or the LVDS cable from your TCon to your Main. However, with few exceptions, if it's a bad TCon you're looking at a total panel replacement.
It could be a ballast board because: 1) The Ballast Board controls the lighting behind the LCD screen. If this isn't working right you won't be seeing much of anything without that back lighting. If this is bad, it's a panel replacement. These are not field replaceable items by LG.
Based on the symptoms, without more data or a eyes-on view of it, I would say you're most likely looking at a Main Brd or PSU problem.