RSS Feed (xml)

Powered By

Skin Design:
Free Blogger Skins

Powered by Blogger

01 December 2008

Video Card Concepts & Troubleshooting

Video Card Concepts
  • Acts as a hardware interface between monitor and PC

  • Has its own chipset and RAM, like a motherboard

  • Talks to the OS via a driver
Video Card Concepts

Video Card Concepts

Video Resolution
  • Pixels: Individual dots in a particular display resolution
  • Examples:

Monitor Resolution
  • Triad: One set of one red, one green, one blue phosphor

  • Number of triads per pixel depends on display resolution chosen in OS

Video Card Types

  • PCI Express:
    *New type of motherboard slot in 2004
    *Faster than AGP

  • AGP:
    *AGP slot on motherboard designed specifically for video card
    *Fast interface

Video Card Types

Video Chipset
  • Not always the same brand as the video card itself

  • Determines overall driver class compatibility

Video RAM

  • How Much RAM needed for a particular resolution?
    *Horizontal resolution x vertical resolution x color depth in bits
    *Convert answer to bytes by dividing by 8
    *Example: 1024 x 768, 24-bit color
    *Number of pixels: 1024 x 768 = 786,432
    *Bits required: 786,432 x 24 = 18,874,368
    *Convert to bytes: 18,874,368 ÷ 8 = 2,359,296

3D Acceleration

  • Increases amount of RAM required by about 4X because extra RAM is needed for buffers

Install a Video Card

1.Remove old video card if needed
2.Remove backplate from slot if needed
3.Insert video card firmly in slot
4.Secure it with screw or retainer bar
5.Connect a monitor, and boot

Set Display Properties in Windows

1.Install correct driver for video card if needed
2.Right-click the desktop, choose Properties
3.Change resolution and color depth on Settings tab

Troubleshooting Video Card

  • Nothing appears on-screen
    *Monitor turned off
    *Monitor contrast turned down
    *Monitor not connected
    *PC not powered on
    *Defective video card
    *Not installed correctly
  • Screen has a red, blue, or green tint
    *Pin broken on monitor or video card connector
    *Connector not snugly plugged in
  • Garbled Windows display
    *Bad video driver
    *Correct problem in Safe Mode
  • Vertical stripes on Windows display
    *Corrupted video driver
    *Physical defect in video card
    *Not the monitor’s fault
  • Windows won’t start except in safe mode
    *Bad Windows video driver
    *Wrong driver installed for video card
  • Pictures and colors look bad
    *Too low a color depth being used
    *Video card not recognized, so it is using standard VGA mode (16 color)
    *Install driver for exact model of video card
  • Certain Applications Crash
    *Video driver not up-to-date
    *Patch for application required
    *New version of DirectX required

No comments: