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My Comptia A+ Studyguide > Display, Video, and Projector Troubleshooting > Flashcards

Display, Video, and Projector Troubleshooting Flashcards

1
Q

Which components comprise the video system in a PC?

A

video cable
video adapter
display device

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2
Q

What can cause no output on a video monitor?

A

-loose cable

The most common cause of this error is a loose cable. Reattach the cable running from your monitor to your PC. If the monitor is still not displaying a signal after firmly reattaching the cable, the problem could lie with the cable, especially if the cable has visible damage.

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3
Q

The output on a video monitor displays in VGA mode. What could cause this?

A

missing, buggy, or incompatible video board driver

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4
Q

A monitor suddenly shuts off during use. What could cause this?

A

-overheating

One reason the monitor could shut off is because it’s overheating. When a monitor overheats, it shuts off to prevent damage to the circuitry inside. Causes of overheating include dust build-up, excessive heat or humidity, or blockage of the vents that allow the heat to escape.

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5
Q

What can cause the output of an LCD to look pixelated and chunky?

A

This issue is caused by the current resolution that is set not being native to the monitor.

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6
Q

What are some causes of a dim LCD screen?

A

This issue can be caused by a burnt-out backlight or a malfunctioning inverter.

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7
Q

Which setting can you change to stop an LCD from flickering?

A

From the Refresh rate list, choose a higher value than 60 Hertz to reduce display flicker.

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8
Q

For an analog display, what is minimum suggested setting?

A

80 Hertz

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9
Q

For a digital display, what is minimum suggested setting?

A

75 Hertz

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10
Q

How can you remove image retention on a plasma display?

A

If your plasma or LCD screen already has image burn-in, you can try turning on white static for 12 to 24 hours. The constant moving of white-and-black across your screen in random patterns can help remove the ghost image from your screen.

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11
Q

An LCD monitor has dead and stuck pixels. How can you fix this issue?

A

-replace screen
The most reliable way to fix a dead pixel is to replace the screen. Many manufacturers have warranties that cover dead pixels, so check your device’s warranty to see if this situation applies to you. Most display manufacturers require a minimum number of dead pixels before the screen can be replaced.

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12
Q

What setting can affect the size of images and icons?

A

resolution of monitor

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13
Q

Part of an image that stays on-screen after the screen is cleared of the image.

A

Artifact

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14
Q

When an image displays on a screen for too long and becomes permanently stuck. It is also known as image retention (IR).

A

Burn-in

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15
Q

A standard for compressing and decompressing audio and/or video.

A

Codec

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16
Q

A simplified startup mode that can help you troubleshoot video card issues that interrupt Windows OS functions.

A

Video Graphics Array (VGA) mode

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17
Q

When troubleshooting video, keep in mind that the problem might be with the video card, the monitor, or the software settings.

A

Facts

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18
Q

A good place to start when troubleshooting video is to adjust the monitor settings (such as brightness, contrast, or color balance) and checking logs for multiple failed jobs to provide clues about which component is malfunctioning.

A

Facts

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19
Q

Restarting the computer in Video Graphics Array (VGA) mode, a simplified startup mode that helps troubleshoot issues with the video card, is also helpful in many situations.

A

Facts

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20
Q

What to do if your system dont start?

A

-Computers require a functioning video card in order to boot.
-If the system does not boot and the monitor is blank, check the monitor’s power and video connections.
-If the motherboard returns a POST error (either a code or a series of beeps), ensure the video card is seated properly and has the necessary power connections.
-If the motherboard still returns a POST error, the video card is bad and should be replaced.

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21
Q

What to do when colors not correct or
colors are not smooth?

A

-Incorrect colors are often caused by low color depth settings.
-A color palette is the current list of colors that can be shown on the screen.
-Color shift occurs when a new image must load a different palette than is currently used.
-To correct color shift, increase the color depth of the display.

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22
Q

what to do when you see blurry images or strange color tints?

A

-This problem is often caused by a weak or corrupt signal from the video card.
-Make sure the monitor cable is securely fastened to the video card.
-Check for bent or missing pins.

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23
Q

what to do when image is missing, doesn’t fill the screen, skewed, or cut off?

A

-Set the display resolution to the monitor’s native resolution.
-If the display isn’t visible at all, check the monitor’s brightness settings to verify that the screen isn’t dimmed.

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24
Q

what to do when program or system lockup, system crashes, and when theres slow video performance?

A

-Software or system problems can be caused by incorrect video settings, especially for programs that have high video demands.
-To correct the problem:
-Update the video card drivers.
-Decrease the video acceleration settings (this decreases the amount of processing done by the video card).

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25
Q

what to do when screen flickers or appears wavy, and user reports headaches?

A

-A flickering screen can be caused by too low of a refresh rate or a loose video cable.
-Make sure the video cable is properly connected.
-Set the refresh rate to the maximum allowed by the monitor.
-If you cannot increase the refresh rate, try decreasing the resolution size and see if higher refresh rates become available.

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26
Q

Maximum refresh rate is determined by the monitor, the video card, and the video cable. To achieve higher refresh rates, one (or all) of these components may need to be upgraded.
True or False

A

True

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27
Q

what to do when your screen is blank and has distorted images?

A

-These problems are typically caused by improper resolution settings or settings outside the scope of the monitor.
-Always set the resolution to the display’s native resolution.
-If necessary, upgrade the monitor to allow for higher resolutions.

28
Q

what to do when images does not display on a second monitor?

A

For problems with dual-monitor systems:
-Make sure the video card supports dual display.
-Verify that the operating system supports and is configured for dual displays.
-In display settings, extend the desktop onto the second monitor.

29
Q

what to do when your pc has slow performance when drawing screens?

A

-By default, Windows automatically adjusts visual effects based on system performance.
-You can manually modify the types of effects used to optimize how Windows looks and performs.
-In general, the more visual effects that are enabled, the more CPU and graphics processing is required.
-If the system has a slow processor, low memory, or not enough video memory, using visual effects can make the system respond slowly.
-Use the advanced system settings to edit performance settings for visual effects.
-In File Explorer, right-click This PC and select Properties.
-Select Advanced system settings.
-On the Advanced tab under Performance, select Settings.
-Optimizing for appearance turns on all visual effects. Optimizing for performance turns off all effects. Effects can be enabled or disabled individually.

30
Q

what to do when pc is stuck and has dead pixels?

A

-A pixel that is stuck is in an always on state and displays white.
-A dead pixel is stuck in an off state and displays black.
-Stuck pixels can be fixed by playing special videos that display a series of colors.
-Sometimes the video needs to be played for several hours.
-Most of the time, dead pixels are caused by a malfunctioning pixel and cannot be fixed.

31
Q

If playing the video does not fix stuck or dead pixels, the only way to fix the problem is by replacing the monitor.
True or False

A

True

32
Q

what to do when image has retention and screen burn-in?

A

-Image retention (IR) is caused by a static image being displayed for too long on a screen, creating a shadow of the image that is visible even when the display is off.
-This is typically a problem for plasma displays only.
-Most of the time, IR can be fixed by displaying bright white on the screen for an extended period of time.
-When the image cannot be fixed and is permanent on the screen, it is known as burn-in.

33
Q

what to do when video files do not play and audio plays but no video?

A

-Digital video can be saved in one of several file formats (called codecs). -Before you can play a video file, your computer must have the corresponding codecs installed.
-Many video files use two codecs, one for video and one for audio.
-If the audio plays but the video does not, then you know you have the correct audio codec, but need the video codec installed.

34
Q

the exact number of dots on the physical screen

A

Native Resolution

35
Q

If the “Native Resolution” is 1280 x 768, the screen is physically 1280 dots wide and 768 dots tall. Supported Resolution is the number of dots a monitor can emulate electronically.
True or False

A

True

36
Q

Problems with projectors can come from physical issues, as well as from software, settings, or programming.
True or False

A

True

37
Q

The best approach to troubleshooting projectors, like other audio-visual equipment, is to start with a basic physical checklist to make sure everything is physically working properly.
True or False

A

True

38
Q

Things to check
Projector is plugged in to a power source and turned on.
Power cord is undamaged and fitted tightly in the outlet and the projector.
Projector is connected to the source computer with the correct cable in the correct port.
Projector inputs can vary from VGA, HDMI, HDMI1, HDMI2, and more. Check for compatibility with computer to select the best cable.
You should replace a questionable cable with a known good cable to test for cable problems.

A

Facts

39
Q

Things to check:
Projector bulb or lamp is bright, tightly fitted, and not too hot.
Issues with display contrast, brightness, dimming, flickering, or wavering can indicate a bulb that is close to the end of its life.
No display can indicate the bulb has failed or is overheated.
To correct, replace bulb (or allow it to cool) and retest.
All vents are clean and unobstructed to avoid overheating.
Inverter is working properly. A bad inverter can cause dimness. Replace inverter when needed.
Remote control batteries have power and are installed correctly.

A

Facts

40
Q

what to do when theres incomplete, fuzzy, or wrong color images on screen?

A

-This problem can be cause by the source computer set to a different resolution than the projector.
-Many projectors have unchangeable resolution settings. -You must change the source computer’s settings to match the resolution of the projector.
-Another cause can come from dirty or damaged LCD panels.
-To correct, clean or replace the LCD panels.

41
Q

what to do when theres no display image?

A

Outdated software can cause this problem. Update the driver for the projector.
Update the source computer's operating system (OS) software. A burned out or overheated bulb can also be the cause of this problem.
`Replace the bulb or allow it to cool down to correct the problem.

42
Q

what to do when theres an intermittent shutdown?

A

Possible causes include:
The projector is set to go to standby mode after a period of inactivity. Sensors such as filter, lamp, temperature, or internal function can cause shutdown when triggered.
Many projectors come with an indicator light that can help you identify the cause of a problem. Check the projector owner’s manual to interpret the signal from the indicator light and find corresponding solutions.

43
Q

what to do when theres no sound coming from pc?

A

Possible causes include:
Volume is turned down or muted. Source computer’s audio output is not set to the projector.
To correct, select the projector for the audio output in settings. Outdated apps on the projector.
To correct, check for updated projector apps. Projector is connected to the source computer through a VGA cable.
VGA cables are not capable of delivering sound. To correct, use an audio cable or a VGA to HDMI adapter to deliver the audio to the projector.

44
Q

what to do when audio not in unison with video?

A

This problem is usually caused when playing a high-definition video and using external speakers. This happens because audio files are processed faster than high-definition video files.
`To correct, select an audio delay function from the source computer’s settings.

45
Q

A dim image on an LCD monitor is usually caused by a misconfigured brightness setting, an automatic power-saving mode, or a malfunctioning backlight. If your laptop suddenly dims, first check to verify that the power adapter hasn’t been accidently disconnected. `Most laptops automatically dim the screen brightness when they run low on battery to minimize power usage.

A

facts

46
Q

Since you know that you haven't changed the brightness settings, it is very unlikely that these settings would be changed automatically. Therefore, the dimness could be caused by a failed compact fluorescent light (CLF) or inverter. These two items provide the backlight for LCD monitors. If you’re tech-savvy, you may be able to replace the bad component yourself. Otherwise, you will need to get a professional to fix or replace the monitor.

A

facts

47
Q

True or False
LED and LCD monitors have a native display resolution. You should set the resolution of the video board to the native resolution of the monitor (whatever it might be). While it is possible to set a resolution other than the native resolution, the images on the display will be distorted or pixelated.

A

True

48
Q

True or False
DVI-D and DVI-I cables are compatible; both carry digital output to the monitor.

A

True

49
Q

True or False
DVI-A cables are incompatible with DVI-D or DVI-I hardware because they use an analog signal.

A

True

50
Q

True or False
Changing the color depth increases the number of colors that the monitor displays.

A

True

51
Q

Rebooting in Safe Mode will result in a display using the basic VGA video driver. Verifying that the system’s UEFI firmware is compatible with the video card will not solve the issue of displaying in 16 colors at 640 x 480 resolution.
`The sync rate is associated with the physical speed that a router (or modem) communicates.
True or False

A

True

52
Q

LCD monitors have a native display resolution. The native display of this monitor is 1600 x 1200. While it is possible to set the resolution lower than the native display, you should use the native display setting for the clearest picture. Using a DVI-D cable is the same as using a DVI-I cable; both will give you digital output.
Using a DVI-A cable could result in lower quality images, as you will be using an analog signal. Increasing the color depth increases the number of colors that the monitor displays.

A

Facts

53
Q

`When working with LCD monitors, a pixel that is stuck is in an On state and is shown on the monitor as a white dot.

A

facts

54
Q

`A black dot is a dead pixel that is stuck in an Off state. If the dead pixel is not permanently damaged, it can usually be fixed using any of the options mentioned (except buying a new monitor, which does not actually fix the problem).

A

facts

55
Q

`However, the BEST method is to run a video designed to fix dead pixels, which you can purchase or download online. Screen-fixing videos play a random combination of red, green, and blue hues at a rate of up to 60 flashes per second in an attempt to jar the stuck pixel back into its usual cycle.

A

facts

56
Q

True or False
You should adjust the visual effects for best performance. This will disable animation, shading, and fading effects used by Windows. Doing so reduces the load on the older hardware in the client’s system and should increase the user interface’s performance. However, the best solution to this problem would be to install a newer video adapter in the system.

A

true

57
Q

Changing the resolution setting changes the size of text and windows in relation to the screen.

A

facts

58
Q

Changing the color depth affects the number of colors that can be displayed at one time.
true or false

A

true

59
Q

Increasing the video acceleration settings increases the amount of processing done by the video card, not the CPU.

A

facts

60
Q

A bulb on the verge of burning out can cause a projector's screen contrast to display incorrectly and induce flickering. An incorrect cable would not be the source of contrast and flickering problems.
An outdated projector driver could cause the projector to not display anything at all. However, it would not cause contrast or flickering problems. High-definition files that are not in sync with audio files would not cause contrast or flickering problems.

A

facts

61
Q

Intermittent shutdowns can happen when sensors are triggered. Poor air circulation from dirty vents could cause the temperature to rise and trigger the temperature sensor to shut down the projector. Fuzzy images on the display could be the result of improper resolution settings or problems with the LCD panels, not ventilation issues.
A dim display could be the result of a bad inverter or a bulb that is wearing out, not a ventilation issue. The audio and video being out of sync would not be caused by a ventilation problem.

A

facts

62
Q

When the source computer’s resolution settings do not match the projector’s resolution settings, it can cause incorrect colors to display. T or F

A

True

63
Q

Outdated drivers often result in a projector failing to display anything at all. T or F

A

true

64
Q

A triggered filter sensor would likely result in a shutdown. T or F

A

true

65
Q

A VGA cable would not cause the wrong colors to be displayed. T or F

A

true

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