Horizontal lines across a TV screen — whether solid bands, clusters of thin lines, or intermittent flickering rows — signal problems in the row driver section of the display. TV horizontal lines diagnosis in Nairobi follows a structured process to identify the exact fault source.
Understanding Horizontal Line Patterns
The pattern and behaviour of horizontal lines provide important clues:
- Single or few solid horizontal lines: Often a COF (gate driver) fault on the panel glass edge — difficult to repair without panel replacement
- Multiple thin lines in groups: May indicate T-con gate output failure — T-con board replacement often resolves this
- Lines that appear and disappear with temperature: Loose cable connection or thermally sensitive component — often fixable at low cost
- Lines only on certain inputs: Signal processing issue on the main board rather than the display panel itself
The Diagnosis Process
TV horizontal lines diagnosis involves progressively testing each component in the signal chain. A technician will typically:
- Test whether the lines persist across all inputs (panel/T-con issue) or only some (signal chain issue)
- Inspect and reseat the LVDS cable between the T-con and main board
- Replace the T-con board if diagnosis confirms that fault
- Assess the panel’s gate driver COF for damage if T-con replacement does not resolve the lines
Early diagnosis of horizontal lines is important — some causes (loose cables) are inexpensive to fix, while waiting can allow further damage to develop.