Samsung ue65js9505 I've got this LED TV. The screen is damaged during shipping. The screen has got a slap / tap the bottom left corner . it may well turn on but the picture is dark around the left side .

It sounds like you may be experiencing issues with the LED lights that you installed in your Samsung 55-inch smart TV. The fact that the dark spot on the screen has moved to the left side and the lights are appearing at the bottom of the screen like Christmas tree lights is not normal behavior and could be caused by a number of factors.
Some potential causes for the issue could include:

1. Incorrect installation: If the LED lights were not installed correctly, it could cause the issues you are experiencing. Make sure that the lights were installed according to the instructions provided by the manufacturer and the video you watched on YouTube.
2. Damaged LED lights: The LED lights themselves may be damaged or malfunctioning, causing the issues you are experiencing. Try replacing the LED lights with a new set to see if this fixes the problem.
3. Other issues with the TV: The issue could also be caused by a problem with the TV itself, such as a malfunctioning display or control board.

To troubleshoot the issue, you can try the steps listed above. If you are unable to fix the problem, it is recommended to contact Shop Jimmy or a TV repair technician for further assistance. They will have the necessary tools and expertise to properly diagnose and repair the issue.

This can be caused by a loose connection on any of the cables to the display or it maybe a failed connection that is soldered at the edge of the display. If you take your thumb and apply pressure to the edge of the display all the way around in different spots and the line vanishes, it is the actual lcd edge.

Replace the LED back lights strips.

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ELECTRONIC EQUIPMENT REPAIR CENTRE

Not good. You may have a tab failure. A repair shop may be able to diagnose and repair this, but most likely the lcd panel is broken. The panel is the most expensive part of flat tv's. A new panel will cost more than a used tv.

Back-light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/

its somewhere in that backlit area. behind the screen itself obviously. like on my acer g7 its bottom left corner where wires go to the board

Its either the tcon or panel, there is a slim chance its the main

is something on conected on tv? like a camera?

Can you post a picture of the issue? Maybe the mirror got damaged or there is