Picture shakes and hass horizontal lines

The picture shouldbe free of vertical or horizontal lines.

1. If the lines are present on the TV screen, press the SMARTbutton. on the remote control and select Settings> SUPPORT > Picture Test.
2. This menu will appear on the test picture. Select whichoption best describes the result you have.

https://www.lg.com/us/support/help-library/horizontal-or-vertical-lines-tv-CT10000020-1387209695776
A single set of horizontal lines could indicate damage, a graphics system failure, or loose internal video cables. Broken signals from cables or graphics hardware creates impurities in reproducing an image on an LCD screen, conditions that often manifest in the form of vertical or horizontal lines of color. https://itstillworks.com/causes-horizontal-lines-lcd-panel-37988.html

Possible failing main PCB

may need capacitor repair kit. see http://www.amazon.com/Repair-42LC2D-Capacitors-Entire-Board/dp/B0084F9R5M

Most likely you are looking at a defective LCD panel, but I would recommend getting a proper diagnosis.

Check its vertical output section circuit for any component damage or loose soldering terminals. Check the solder terminals of the vertical output IC. Resolder all the suspected solder terminals by applying al little more fresh solder, without making any solder bridge short in between adjacent solder terminals.
If this do not help you, replace the vertical output IC. Lose of Vertical Scan is the problem of your TV.

The two parts that could be causing the problem are the Main bd and the P-Logic bd.

I'd suggest to bring it to repair shop if you're not technically literate

make sure the cable ord in the back is plugged in right

Due to vertical section failure horizontal line apprears. You did not mention about picture. Green horizontal line means with picture or without picture. With picture means there is some leakage. Without picture only singe horizontal line means vertical section totally not working. Particularly green horizontal line means maybe leads to jungle ic failure. Please mention your simptom clearly what you get and what you will not get both video and audio. It will be helpful to answer. Based on your question this is my small information.

needs tape path alignment or cleaning done