Lines on a television screen are not one fault. They are a family of faults, and the pattern of the lines is a surprisingly precise diagnostic clue. Two customers can describe "lines on my TV" and be looking at a ₹1,000 problem and a write-off respectively.
Before you let anyone quote you, learn to read your own screen. It takes five minutes and it is the difference between an informed decision and a blind one.
First, rule out the source
Lines that come from your set-top box, console or HDMI cable are not a TV fault at all. Check this before anything else:
- Open the TV's own settings menu. The menu is drawn by the TV itself, not the source. If the lines appear over the menu too, the fault is in the television. If the menu is perfectly clean and only the video has lines, your source device or cable is the problem.
- Swap the HDMI cable and try a different port. Costs nothing, rules out a lot.
- Try a different source. Plug in a phone or a different box.
If the TV's own menu is clean, stop reading and replace your cable or box. If the lines contaminate the menu as well, read on.
Reading the pattern
| What You See | Most Likely Cause | Repairable? |
|---|---|---|
| Thin, sharp, fixed vertical lines (one pixel wide, never move, often coloured) | Failed column drivers bonded to the panel itself | No — panel replacement only |
| Thick vertical bands or blocks of wrong colour | T-CON board failure or loose LVDS ribbon | Yes — usually affordable |
| Horizontal lines or bars, especially flickering | T-CON board, row driver, or ribbon connection | Often yes |
| Half the screen black or garbled | One side of the panel drive circuit has failed | Sometimes — depends where |
| Lines that change when you press the screen bezel | Physically loose panel connection | Yes — often just reseating |
| A spiderweb or radiating crack pattern | Physical impact damage to the panel | No — panel replacement only |
The single most useful test: press the bezel
With the TV on and showing lines, press gently — very gently — on the plastic frame around the edge of the screen, near where the lines start. Do not press the glass itself.
If the lines flicker, change or briefly disappear, you have a mechanical connection fault. A ribbon cable has worked loose, or a bonded connection on the panel edge has partially separated. The reseating version of this is a cheap fix. The de-bonded version sometimes responds to a careful reflow.
If the lines are completely unaffected, the fault is electrical rather than mechanical — a board, or the panel drivers themselves.
⚠️ Genuinely do not press hard. LCD panels are glass under tension. A firm press to "fix" a flicker is one of the most common ways people turn a repairable television into scrap. Feather-light pressure on the plastic bezel only.
The honest bit: when lines mean the TV is finished
Thin, sharp, single-pixel vertical lines that never change are the outcome nobody wants. They mean the driver circuitry bonded directly onto the panel's glass has failed. That circuitry is not a replaceable part — it is manufactured into the panel.
The only fix is a whole new panel, and the panel is the most expensive component in the television, frequently costing more than half the price of a new set. Add labour and the risk of cracking the glass during the swap, and you are usually within touching distance of simply buying a new TV with a fresh warranty.
We tell customers this before we take their money, not after. If your set is more than about six years old and has fixed vertical lines, our honest advice is usually to replace it. See our panel replacement page for the full picture, and our guide to repair versus replacement for the maths.
The good outcomes
Not every line is a death sentence. These are all genuinely worth repairing:
- Loose LVDS ribbon cable. The cheapest fix there is. Common after a TV has been moved or wall-mounted, and after a humid monsoon season in Delhi.
- Failed T-CON board. A model-specific board, replaced rather than repaired. Moderate cost, worth doing on almost any television.
- Main board fault. Sometimes a corrupted video output from the main board produces banding. Component-level repair is often possible — see TV motherboard repair.
The point is that a technician has to open the set to know which of these it is. Anyone quoting you a panel replacement over the phone, on the basis of you saying "there are lines", is guessing at your expense.
What not to do
The internet is full of advice to "fix" screen lines by hitting the TV, pressing hard on the display, or applying heat with a hairdryer to reflow a connection. Please do not. At best these do nothing. At worst — routinely — they crack the panel and turn a repairable television into landfill.
Also, do not open the back yourself. The power supply board stores a dangerous charge in its capacitors long after the set is unplugged.
Getting a real diagnosis
RR Electronics is an independent, third-party out-of-warranty repair service in New Delhi. We are not an authorised service centre for any brand and hold no affiliation with any manufacturer — see our disclaimer. If your television is still under manufacturer warranty, take it to the brand's own centre; it will be free and opening the set voids that cover.
If it is out of warranty, we will come to your home in Delhi, open it, tell you exactly which of the above it is, and — if it is the bad one — tell you to keep your money.