A horizontal or vertical red line appears on picture.

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

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/

These horizontal lines are vertical flyback lines and would indicate
one or more of the tubes cathode drive circuits are defective.
As the picture is predominantly yellow this would indicate excessive drive to red and green guns. Check the red and green video output stages especialy any clamping diodes.regards from Vintie

hi, sounds like a convergence issue. try this...

Look through your manual. Your manual will always give you the most specific directions for your particular model. Look for an "adjusting convergence" or "set manual convergence" section.

Enter the menu on your TV. Use the remote control and bring up the menu.

Choose "Convergence." This may be under "Picture Settings," "Function" or "Advanced Options."

Select a color. You will have red, green and blue to choose from. Do each one, starting with red.

Press "Enter." A crosshair pattern will appear on your screen.

Adjust vertically. If there is a horizontal red line visible, press the up or down arrow keys (or channel up or down) to adjust the convergence until the line is superimposed on the horizontal-center line of the white crosshair.

Adjust horizontally. If there is a vertical red line visible, press left or right (or volume up or down) to adjust horizontally. Do this until the line is superimposed on the vertical line of the white crosshair.

Save settings. It is important to save your settings when you are done, instead of simply exiting the menu.

Repeat these steps for all colors.
good luck!

hi, sounds like a convergence issue. try this...

Look through your manual. Your manual will always give you the most specific directions for your particular model. Look for an "adjusting convergence" or "set manual convergence" section.

Enter the menu on your TV. Use the remote control and bring up the menu.

Choose "Convergence." This may be under "Picture Settings," "Function" or "Advanced Options."

Select a color. You will have red, green and blue to choose from. Do each one, starting with red.

Press "Enter." A crosshair pattern will appear on your screen.

Adjust vertically. If there is a horizontal red line visible, press the up or down arrow keys (or channel up or down) to adjust the convergence until the line is superimposed on the horizontal-center line of the white crosshair.

Adjust horizontally. If there is a vertical red line visible, press left or right (or volume up or down) to adjust horizontally. Do this until the line is superimposed on the vertical line of the white crosshair.

Save settings. It is important to save your settings when you are done, instead of simply exiting the menu.

Repeat these steps for all colors.

good luck!

What is your Make and Model number?

Its bad ccd imager problem in your Sony DSC-T1 camera and Sony will repair it free of cost.
Click Sony CCD Imager Support for details.

Have you tried with a new scart or htm lead?

sounds like vertical problem maybe bad solder connections on vertical ic check and get back to me