Hi,my LG smart TV has fine horizontal lines and the screen flashes from blurry to clear also an icon randomly appears that says a new component has been connected.

1. Check to see if there is any type of damage to the screen, such as a scratch or crack. 2. Try adjusting the picture settings on the TV, such as brightness and contrast. 3. Check the connections between the TV and the external devices it is connected to, such as a DVD player or cable box. 4. Try unplugging the TV for a few minutes, then plugging it back in to see if the lines go away. 5. If none of the above steps work, it may be necessary to contact the manufacturer for a repair or replacement.

The cable is either bad or the cable has not been securely full connected to the input and the output ports can have loose connections and can cause the signal and have horizontal or vertical lines to show up on the TVs screen. The cable will need replacement.

The horizontal lines that are showing up on your TV's screen is caused by either a bad cable or a cable that is not correctly fastened to the input and the output ports for the TV and it can cause interference then and the signal and cause horizontal or vertical lines to appear. It could also be the TV"s screen is no longer working and needs to be replaced.

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

Your LG has a problem on Main board controller. The main board has a graphics driver that give full cycle image going to t-con. Fixing this required main board replacement or repair. Look for a service technician.

You can spend $300 to $500 fixing this or just do the best thing most cost effective thing and replace the TV.

No it looks like you need a new screen.
At only 7 months old have you any cover for repairs.

The problem is vertical failure. Vertical output section to your TV ahs the fault. You ahve to check the vertcial output circuit for any component failure or loose solderings.

Check the 1.8 ohm resistors,located in front of ICs. Try replacing all 3 of them.

Have you tried with a new scart or htm lead?