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Vertical or Horizontal Lines Appearing on a TV Screen
Few faults are as distracting as lines running across or down your television screen. Whether they appear as thin coloured streaks, thick black bands, or jagged distortions that come and go, lines on a TV screen almost always point to an internal hardware issue that worsens with time. Nairobi homeowners who notice this problem should understand its causes before deciding on a repair.
The most frequent cause of vertical lines is a faulty T-Con board, the timing control board that instructs the panel how to render each row and column of pixels. When the T-Con board begins to fail, columns of pixels misfire, producing permanent or intermittent vertical lines. Horizontal lines, by contrast, are more often linked to the panel's ribbon cables or, in some cases, the line scan drivers bonded to the display glass itself.
A second common cause is a damaged or poorly seated flex cable. The flat ribbon cables that carry signals from the main board to the panel can loosen because of heat cycles, physical knocks during wall mounting, or transport damage. In such cases, lines may appear only when the casing flexes, which is a strong indication that a cable, rather than the panel, is at fault.
Third, the LVDS cable, the bundled lead connecting the main board to the T-Con board, can degrade. Corroded or bent pins on this cable produce flickering lines, colour distortion, or a split image. This is a relatively inexpensive fix when diagnosed early.
Fourth, panel damage itself can cause lines. If the television has been dropped or struck, the thin glass substrates inside the LCD or OLED panel can crack invisibly, resulting in lines that no board replacement can cure. A technician can confirm this with a pattern test.
Fifth, software glitches occasionally mimic hardware faults. An outdated firmware version or a faulty input source, such as a damaged decoder or streaming stick, can inject lines into the picture. Testing the TV with a different source and performing a factory reset helps rule this out before opening the set.
Finally, power surges, which are common on the Kenyan grid, can spike through the delicate driver circuits and damage them, leaving permanent lines. Using a stabiliser protects against recurrence.
It is worth understanding the repair economics before committing. A T-Con board replacement typically costs a fraction of a new television, while a panel replacement often approaches the price of a budget set, so accurate diagnosis protects your wallet as much as your screen. Lines that appear suddenly after a storm or a power interruption also deserve a full power board inspection, because surge damage rarely stops at a single component, and untreated boards fail again within months.
If you have tested alternate sources and the lines persist, the fault lies inside the television and requires professional diagnosis. Nairobi residents should contact televisionrepair.co.ke, a trusted workshop on Luthuli Avenue staffed by experienced technicians who repair T-Con boards, replace LVDS cables, and resolve panel-level faults on all major brands, including Samsung, LG, Sony, TCL, and Hisense. Genuine replacement parts and reasonable prices are guaranteed. To book a repair or request a free cost estimate, call 0723763173 today.
