Coloured or black lines running across a TV screen are one of the more worrying faults — but not always a death sentence for the panel. Some lines come from loose cables or a software glitch and clear easily; others point to a failing T-Con board or panel ribbon. This guide helps you tell them apart and fix what you can.
Quick Answer
For lines on your TV screen, first power-cycle the TV and reseat all cables, then test a different input source. If the lines appear on the home menu and every input, the cause is internal (panel, ribbon cable, or T-Con board). If they appear only with one source, the cable or device is at fault. Software-related lines often clear after a power-cycle or firmware update.
Common Causes
- Loose or faulty cable: a poor HDMI/AV connection from the source.
- Source device fault: the connected box outputs a corrupted signal.
- Software glitch: a temporary rendering error fixed by a restart.
- Loose internal ribbon cable: connecting the panel to the board.
- T-Con board failure: common cause of wide, repeating line patterns.
- Physical panel damage: pressure or impact damage to the screen.
Step-by-Step Fix
- Power-cycle: Unplug 60 seconds, hold power 15 seconds, replug.
- Check the home menu: If lines show on the TV’s own menu, the source is not the cause.
- Test inputs: Switch HDMI ports and connected devices to isolate the source.
- Reseat/swap cables: Try a different HDMI cable firmly seated.
- Update firmware: Install any pending software update.
- Factory reset: Rule out software via a full reset.
If the lines come from a faulty source device or cable, a new HDMI cable or streaming stick is a cheap first test:
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Prevention Tips
- Never press on or knock the screen; panels and ribbons are fragile.
- Use a surge protector to shield internal boards from spikes.
- Handle and wall-mount the TV carefully to avoid flexing the panel.
- Keep cables well seated and avoid strain on the ports.
When to Call a Technician
If the lines appear on the home menu and every input, survive a factory reset, and aren’t tied to one cable or device, the T-Con board, internal ribbon, or panel needs professional attention. Panel replacement is often as costly as a new TV, so compare an upgrade in our best smart TV in India guide and learn how to sell your old TV. If the screen instead flickers, see our TV screen flickering fix.
Frequently Asked Questions
Are lines on a TV screen fixable?
Sometimes. Lines from loose cables, a bad source, or software clear easily. Lines from a failed T-Con board or damaged panel usually require costly repair.
How do I know if it’s the panel or the source?
Check the TV’s own home menu. If lines appear there with no source connected, the fault is internal to the TV.
What causes vertical lines on a TV?
Often a loose internal ribbon cable or a failing T-Con board. A power-cycle may temporarily clear ribbon-related lines.
Is it worth repairing a TV with screen lines?
If a panel replacement is quoted, it is frequently close to the price of a new TV — replacement is usually the better value.