Why are there vertical colored lines all over screen?

Yes, it's possible that the T-Con board in your Sony LCD TV may need to be repaired or replaced if it's causing vertical and horizontal white lines on the screen. The T-Con board is responsible for translating the digital signal from the TV's main board into a format that the LCD panel can display.
Before replacing the T-Con board, you may want to try some additional troubleshooting steps, such as checking all the cables and connections, performing a factory reset of the TV, and updating the firmware. However, if none of these steps resolve the issue, then the T-Con board may need to be replaced.
You can purchase a replacement T-Con board online or from a TV repair shop. If you're comfortable with electronics repair, you may be able to replace the board yourself by following instructions provided with the new T-Con board. Alternatively, you can hire a professional TV repair technician to replace the board for you.

If you have replaced the main board and power supply board and are still getting a uniform blue screen on your Samsung LED TV, it could indicate one of the following issues:

1. T-Con Board: The T-Con board, or Timing Control Board, is responsible for managing the flow of video data from the main board to the LCD panel. If the T-Con board is damaged or not functioning properly, it can result in a blue screen.
2. Backlight Inverter: The backlight inverter is responsible for powering the backlight of the TV. If the backlight inverter is not working properly, it can result in a uniform blue screen.
3. LCD Panel: The LCD panel could be damaged or have developed a problem, causing the uniform blue screen.
4. Signal Cable: The cable connecting the main board to the T-Con board or the LCD panel could be damaged, causing a lack of signal and a blue screen.

It's best to consult with a professional repair technician or the manufacturer for further diagnosis and repair. They will be able to determine the exact cause of the issue and recommend the best course of action.

What causes vertical colored lines on a TV screen? When a TV is showing vertical colored lines, a loose wire cable in the TV might be the cause. If you knock on the back of the TV, the vertical colored lines MAY disappear temporarily. This is a sign that a cable is loose or the T-Con board is faulty.

https://removeandreplace.com/2018/05/01/tv-has-different-color-vertical-lines-on-screen-how-to-fix/

panel needs replacing

1. Identify the TCON board.
2. Reset the Left side ribbon cables on the T-CON board
3. Replace CON board if you find a spare

T-con is not the problem. The main board is.

probably the 2 ribbon/flex cable(s) aren't connected correctly between the T-CON board and the Scan boards that are connected to the screen/panel!
If not replace T-CON board, and if that does'nt work
the screen/panel is most likely bad!

If this tv vertical colors lines problems happen by itself,tv problems not causes by u or an object by hitting forces to the tv LCD screen panel itself.The tv board that call the T-CON board it is dead,this board sit in the bottom in the middle of the LCD screen panel.Must be replaced the T-CON board to solve tv vertical colored vertical lines.Tries websites like Shopjimmy.com,Ebay.com to buy a whole new refurbish T-CON board for the replacement.If causing by u or an object by hitting forces it to the LCD screen panel itself.The tv not worth a whole tv anymore,because by replacing the tv LCD screen panel will cost the same as a new tv.

Anybody or an object hit the LCD screen panel,that cause truama to it,than it not repairable.The LCD screen panel it dead.Nobody or an object hit the LCD screen panel.If vertical colors lines it happen,by itself.Than the T-Con board is dead.The T-Con board,that the board,that sit right in the middle bottom of the LCD screen panel.Replaced the T-Con board should solved this problems.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish T-Con board for the replacement.

Hi,
It is hardware issue related to LCD Panel (screen).
Regarding fixing it, it depends if you are handy with electronics stuff repair and can replace circuit boards in tv etc then please check T-Con (lcd controller board) on top center position at rear of lcd panel, this board would be covered with metal shield. Need to take off back cover of tv to get access to T-Con board. If T-Con board does not solve lines problem of screen then LCD Panel is bad and will be replaced.
If you fee uncomfortable doing so then repairman option is better choice.
Hope this info will help you.
Thanks.