Symptom Possible Cause Items to Check Typical Solution. Color pat- Incorrect color Check the color man- terns incor- management agement settings for the rect profile


 

Color pat- Incorrect color Check the color man-
terns incor- management agement settings for the
rect profile display.


Rerun the Color Management Wizard in Windows or use a third-party color management tool such as DataColor’s Spyder or Pantone’s Huey.


 

Dim image Incorrect bright- Check the brightness,
  ness or contrast contrast, and gamma
  settings settings for the display.


If installed, use the screen management settings for NVIDIA or AMD video cards or use the Windows Color Management Wizard.


 

  LCD display: Shine a flashlight on the Test inverter; if damaged,
  Failure of inverter display; if the desktop replace.
    is visible, check the  
    inverter.  
       
  LCD display: Check the inverter first; Replace the backlight or
  Failure of back- if the inverter is okay, the entire LCD panel if
  light the backlight has failed. cost-effective.
       
Flickering CRT display: Check the vertical Set the vertical refresh
image Vertical refresh refresh rate setting in rate to 75Hz or higher.
  rate too low advanced display prop- Adjust the screen height,
    erties.
    width, and centering after
     
      selecting the refresh rate
      as needed.


 

LCD display “Flickering” on an LCD
on VGA port: is actually pixel swim
Problems with due to a poor analog/
analog/digital digital conversion.
conversion Use the Auto button on
 
  display to resynchronize
  display.


Use DVI, HDMI, or DisplayPort with the LCD display if available on the display and computer to have a pure digital con-nection.


 

Interlaced verti- Check the refresh rate
cal refresh rate selected.
selected Interlaced resolutions
 
  require long-decay
  phosphors and are sel-
  dom used today except
  with 1080i HDTV.


 

Select the correct non-interlaced refresh rate (usually 60Hz for LCD, LED displays; 75Hz or higher recommended for CRTs).


Chapter 9: Troubleshooting 181

 

 

Symptom Possible Cause Items to Check Typical Solution
       
Distorted CRT display: Use onscreen display Different resolutions
image Bowing out (bar- (OCD) to correct distor- and refresh rates require
  rel) or bowing tion. unique settings.
  in (pincushion)   Check with the user to
  distortion  
    determine the preferred
     
      resolutions and refresh
      rates and adjust those
      first.
       
  CRT display: Electromagnetic inter- Look for interference
  Wavy lines ference from nearby sources such as micro-
    poorly shielded devices. wave ovens and move
      them away from the
      display.
      Replace the CRT with an
      LCD or LED display.
       
  CRT or LCD dis- The display may use Change the resolution to
  play: Resolution compression to display the native setting (LCD,
  too high for dis- the video signal. LED).
  play   Change the resolution to
     
      maximum supported by
      flicker-free vertical reso-
      lution (CRT).
       
Discoloration CRT: Magnetic Use the degaussing If not available in the
(degaussing) distortion in option in the onscreen onscreen menu, look for
  shadow mask menu. degaussing button on
      display or turn off the
      display, wait a couple of
      minutes, and turn it on
      again.
       
BSOD Various problems Note the STOP error Research the STOP error
(STOP Error) with Windows code. code at http://support.
  configuration or   microsoft.com.
  hardware   Replace any defective or
     
      incompatible hardware or
      software.
       

182 CompTIA A+ Quick Reference