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Horizontal or vertical lines across the TV screen often indicate a problem with the display panel or its connections. These lines can be permanent or intermittent and may appear as solid, dashed, or colored streaks. The first step is to determine whether the lines appear on all inputs or only specific ones. If the lines are present on all inputs, including the TV internal menu, the issue is likely with the TV hardware. If they only appear with certain devices or inputs, the connected device or its cable may be the cause.
For input-specific lines, inspect the HDMI or other cables connecting the device to the TV. A damaged cable can cause signal interference that manifests as lines on the screen. Try replacing the cable or using a different HDMI port. If the lines disappear, the original cable or port was likely faulty. Also, check the resolution settings on the connected device. If the device outputs a resolution higher than the TV can handle, it may cause display artifacts, including lines. Adjust the device resolution to match the TV native resolution.
If the lines appear on all inputs, the issue is internal to the TV. Loose or damaged ribbon cables connecting the display panel to the T-Con board can cause lines. The T-Con board, or timing control board, manages the signals sent to the display panel. If this board or its connections are faulty, it can result in horizontal or vertical lines. Opening the TV to check these connections requires technical skill and should be done by a professional, as improper handling can cause further damage.
The display panel itself may be defective. If the panel has internal damage, such as cracked liquid crystal layers or faulty pixels, it can produce permanent lines. Physical damage to the screen, such as pressure or impact, can also cause lines. If the TV has been dropped or subjected to force, the panel may be irreparably damaged. In such cases, panel replacement is often cost-prohibitive, making TV replacement a more practical option.
Software issues can occasionally cause display artifacts. If the lines appeared suddenly and the TV is a smart model, check for firmware updates. Some updates address known display issues. Alternatively, perform a factory reset to rule out software corruption. If the lines persist after these steps, the problem is likely hardware-related.
For intermittent lines, heat or poor connections may be the cause. If the lines appear after the TV has been on for a while and disappear after cooling down, overheating components may be to blame. Ensure the TV has proper ventilation and is not enclosed in a cabinet that traps heat. If the issue is consistent and unrelated to heat, the T-Con board or panel may need replacement.
