Examkin

Question

Difficulty: MediumVideo, Display, and Projector Issues

A systems technician is addressing two hardware tickets regarding computer displays in an enterprise environment:

1. Ticket A: A desktop user upgraded to a 4K monitor, but the screen constantly flickers and drops signal when set to 4K resolution at 60 Hz over a legacy HDMI cable. The monitor displays standard 1080p fine.
2. Ticket B: A mobile user has an ultraportable laptop with a completely dark OLED screen. A desktop support intern suggests replacing the screen's backlight inverter board to restore brightness.

Which of the following troubleshooting statements and resolution steps are CORRECT? (Select TWO.)

  1. Replacing the inverter board will not resolve the dark laptop screen because OLED displays feature self-emissive pixels and do not use a backlight or inverter board.Answer
  2. The 4K resolution flickering is likely caused by inadequate cable bandwidth, requiring an upgrade to an Ultra High Speed HDMI (HDMI 2.1) cable.Answer
  3. C
    Installing a high-voltage AC inverter board behind the laptop display panel will supply the required power to brighten the OLED backlight.
  4. D
    Flickering and screen artifacts at 4K resolution indicate a corrupted graphics card display driver that must be reinstalled before replacing hardware.

Answer

Replacing the inverter board will not resolve the dark laptop screen because OLED displays do not use backlight inverters, and the 4K monitor flickering is caused by insufficient video cable bandwidth requiring an upgraded HDMI cable.
The correct statements recognize two fundamental hardware principles: OLED screens do not use backlight inverter boards because each pixel generates its own light, and driving high resolutions like 4K at 60 Hz requires high-bandwidth video cables like Ultra High Speed HDMI cables.

Step-by-Step Solution

1
Analyze the OLED laptop display symptom.
Recognize that OLED (Organic Light-Emitting Diode) technology utilizes self-emissive pixels rather than a CCFL backlight array.
Because OLED displays do not have backlights, they do not utilize backlight inverter boards. Attempting to replace an inverter on an OLED display is impossible.
2
Analyze the 4K display flickering symptom.
Determine that 4K at 60 Hz requires up to 18 Gbps (HDMI 2.0) or 48 Gbps (HDMI 2.1) of data throughput.
Legacy HDMI cables lack the required shielding and clock speeds for high bandwidth, causing signal degradation and flickering at higher resolutions while functioning at lower resolutions like 1080p.

Key Concept

Display Technologies (OLED vs LCD) and Cable Bandwidth Constraints
Rate this question

Topics

Video, Display, and Projector Issues

More questions from this topic