220-802 · Question #517
Multiple users have reported that there are black dots on the conference room LCD when doing presentations. Which of the following is MOST likely the problem?
The correct answer is B. The LCD has dead pixels. Black dots fixed on an LCD screen indicate dead pixels, which are permanent hardware defects where individual pixels stop producing light.
Question
Multiple users have reported that there are black dots on the conference room LCD when doing presentations. Which of the following is MOST likely the problem?
Options
- AThe video card displaying to the LCD is incompatible.
- BThe LCD has dead pixels.
- CThe LCD needs to be recalibrated.
- DThe conference room PC is overheating.
How the community answered
(33 responses)- A3% (1)
- B94% (31)
- D3% (1)
Why each option
Black dots fixed on an LCD screen indicate dead pixels, which are permanent hardware defects where individual pixels stop producing light.
An incompatible video card would cause issues like no signal, incorrect resolution, or flickering - not fixed black dots at specific pixel locations on the panel.
Dead pixels are a common LCD hardware defect where individual pixels permanently fail and appear as fixed black or colored dots on the screen. This is a physical failure of the liquid crystal cell or backlight element for that pixel and cannot be fixed through software or recalibration. The fixed, unchanging nature of the dots across multiple presentations confirms a hardware display defect rather than a signal or software issue.
Recalibration adjusts color accuracy, brightness, and white balance but cannot repair physically failed pixels.
PC overheating causes system slowdowns, shutdowns, or GPU rendering artifacts, not permanent fixed black dots on the display panel itself.
Concept tested: LCD dead pixel hardware defect identification
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