An older laptop with a CCFL-backlit display shows a picture that flickers and takes on a dim reddish-pink tint shortly after boot, though the image content itself is intact. The panel, cabling, and graphics output all test good. Which component should the technician replace?
- AThe LCD panel assembly, because a failing liquid crystal layer is what produces the pink tint and the flicker on a CCFL display.
- BThe digitiser, because a degraded digitiser layer over the CCFL panel scatters the backlight and produces the flickering pink cast.
- CThe ambient light sensor, because a faulty sensor drives the CCFL backlight to the wrong brightness and shifts its colour towards pink.
- DThe inverter, because it steps the laptop's DC up to the high-voltage AC the CCFL backlight tube needs, and a failing inverter causes flicker and a pink or dim tint. Correct
Why A is wrong: A pink tint plus flicker points at the backlight circuit, not the crystals; the stem also states the panel tests good, so swapping it would not fix the fault.
Why B is wrong: The digitiser senses touch and does not carry backlight power, so it cannot cause a tinted, flickering backlight; this misattributes a power fault to an input layer.
Why C is wrong: The light sensor only adjusts a brightness target; it cannot alter the tube's colour or cause hardware flicker, so it is a tempting but incorrect root cause.
Why D is correct: The inverter converts DC to the high-voltage AC that fires the CCFL tube; as it fails the tube is under-driven, giving the classic flicker and reddish-pink dimming described.