Why Does My TV Have Horizontal Lines? Causes & Fixes

Lines across your TV screen are alarming — but they don’t always mean the panel is finished. The cause ranges from a loose internal connector to genuine panel damage, and the fix (and cost) varies hugely. Here’s how to understand what you’re seeing.

What Causes Lines on a TV Screen?

• Loose or failing ribbon cables connecting the panel to the T-CON board — a frequent, repairable cause.
• A faulty T-CON (timing control) board, which drives the image across the panel.
• Mainboard or processing faults sending a corrupted signal to the display.
• Physical or pressure damage to the panel itself — the most serious cause.

Are They DIY-Fixable?

Honestly, mostly not. A couple of safe checks are worth doing first — change the input source and try a different HDMI cable to rule out an external device, and make sure it isn’t a screensaver or demo mode. But the real causes are inside the TV, behind the panel, where DIY attempts risk turning a small repair into an expensive one.

T-CON Board vs Panel: How Technicians Tell

A technician will open the TV and test methodically: reseating ribbon connectors, checking the T-CON board’s output, and applying gentle controlled tests to see how the lines respond. If reseating or replacing the T-CON board resolves it, the repair is relatively affordable. If the fault is in the panel’s own circuitry, a panel replacement may be the only option — which is when an honest repair-vs-replace conversation matters most.

FirstFix TV diagnoses screen-line faults precisely before quoting, so you never pay for a panel when a board or cable is the real culprit. Book a doorstep inspection across Mumbai today.