220-1201 Display Devices Troubleshooting — Timed 10 Questions

Question 1

A user's 4K monitor is set to 3840x2160 resolution but text and icons appear very small and blurry. The display cable is a standard HDMI cable. What is the most likely cause of the blurriness?

Accepted Answer

The HDMI cable does not support enough bandwidth for 4K resolution. Standard HDMI cables (especially older versions) may not have sufficient bandwidth for 4K at proper refresh rates, leading to chroma subsampling and blurry text. The correct answer identifies bandwidth limitation as the cause, and the solution would be to use a high-speed HDMI or DisplayPort cable.

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The monitor's refresh rate is set too high

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The graphics driver is corrupted

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The monitor's scaling settings are incorrect

Question 2

A technician is setting up a dual-monitor workstation. One monitor is connected via DisplayPort, the other via DVI. The DVI monitor is not detected. The DisplayPort monitor works fine. Which of the following is the most likely cause?

Accepted Answer

The DVI cable is loose or the monitor is not powered on. Many graphics cards require that the DisplayPort monitor be the primary display or that the DVI port is disabled when a DisplayPort is active in certain configurations. However, the most common issue is that the DVI cable is not fully seated or the monitor is not powered on. The correct answer focuses on checking the DVI connection and power, as these are simple to verify.

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The DVI port on the graphics card is faulty

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The graphics card does not support mixed DisplayPort and DVI outputs

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The DVI monitor's resolution is set too high

Question 3

A technician is troubleshooting a display that shows a single vertical line of dead pixels from top to bottom. The monitor is under warranty. Which of the following is the most appropriate resolution?

Accepted Answer

Replace the monitor under warranty. A vertical line of dead pixels indicates a defect in the LCD panel's column driver or bonding, which is a hardware failure. Unlike a few stuck pixels, this cannot be fixed by software or gentle pressure. The correct answer is to replace the monitor under warranty, as this is a manufacturing defect.

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Use a pixel-fixing software to cycle colors rapidly

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Gently massage the affected area with a soft cloth

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Update the graphics card driver

Question 4

A user reports that their LCD monitor intermittently goes black for 2-3 seconds, then returns to normal. This happens randomly, not during any specific activity. The monitor's power LED stays green during the blackouts. Which component is most likely failing?

Accepted Answer

The monitor's backlight or inverter is failing. A green power LED during blackouts indicates the monitor is receiving power and signal, but the backlight is failing. Intermittent backlight failure is a common issue in aging CCFL or LED-backlit LCDs, often due to failing capacitors or inverter. The correct answer identifies the backlight or inverter as the culprit, as the display logic is still working.

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The video cable is loose

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The graphics card is overheating

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The monitor's power supply is failing

Question 5

A customer complains that their LCD monitor has a persistent faint shadow of the previous image visible on the screen, even after changing applications. What is the most likely cause of this issue?

Accepted Answer

Image persistence due to static content. This describes image persistence or burn-in, common in LCD panels left on static images for extended periods. Unlike dead pixels or backlight issues, this is a temporary or permanent ghosting of static content. The correct answer identifies the root cause as static image retention, which can sometimes be reversed with screen refreshers.

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A failing backlight inverter

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A damaged video cable

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Incorrect color calibration settings

Question 6

A technician is troubleshooting a desktop PC that powers on but shows no display on the monitor. The monitor's power LED is amber (standby). The PC has an integrated GPU and a discrete GPU. Which step should be taken FIRST to isolate the issue?

Accepted Answer

Check that the monitor cable is plugged into the discrete GPU, not the motherboard. An amber LED indicates the monitor is not receiving a signal. The most common oversight is connecting the cable to the wrong video port (motherboard vs. GPU). The correct first step is to verify the cable is connected to the discrete GPU's ports, as integrated graphics are often disabled when a dedicated card is installed.

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Reseat the RAM modules

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Replace the CMOS battery

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Test the monitor on another computer

Question 7

A user reports that their external monitor connected via HDMI displays a 'No Signal' message, though the monitor power LED is lit. The laptop's built-in display works fine. Which of the following should be checked FIRST?

Accepted Answer

Ensure the HDMI cable is fully seated at both ends. This question tests the systematic approach to display troubleshooting. The monitor is powered on (LED lit) but not receiving a signal, so the most common cause is a loose or faulty cable connection. Always check physical connections before moving to more complex settings or hardware replacements, as this is the quickest and simplest fix.

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Update the graphics driver

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Replace the monitor

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Adjust the screen resolution in Windows settings

Question 8

A user's projector displays a very dim image, even with the brightness setting at maximum. The lamp hour counter shows 1500 hours, and the projector is three years old. What is the most likely cause?

Accepted Answer

The projector lamp is reaching end of life. Projector lamps dim over time and typically need replacement after 2000-4000 hours. A dim image with max brightness and moderate lamp hours indicates the lamp is nearing end of life. The correct answer identifies lamp aging as the primary cause, not filters or cables.

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The projector's air filter is clogged

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The video cable is damaged

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The input source is set to low brightness

Question 9

After installing a new graphics card, a user's display shows distorted colors and random artifacts during boot. The system POSTs successfully. Which of the following is the most likely cause?

Accepted Answer

The power supply unit is insufficient for the new card. Artifacts and color distortion after a new GPU install typically point to insufficient power delivery or a faulty card. Since the system POSTs, it's not a complete failure but likely a power or driver issue. The correct answer highlights that the power supply may not meet the card's requirements, causing instability.

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The monitor is incompatible with the new card

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The graphics card driver is outdated

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The display cable is loose

Question 10

A user reports that their laptop screen flickers intermittently, but the flickering stops when they adjust the screen angle. What is the most likely hardware issue?

Accepted Answer

A loose or damaged display cable. Flickering that changes with screen angle is a classic symptom of a damaged or loose display cable (LVDS or eDP ribbon) that connects the screen to the motherboard. This is common in laptops due to hinge wear. The correct answer identifies the cable as the likely culprit.

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A failing backlight LED

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A defective graphics chip

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Incorrect display refresh rate setting