Preset Timing Modes

If the signal transferred from the computer is the same as the following Preset Timing Modes, the screen will be adjusted automatically (Exception : 640 x 480/60Hz, 720 x 400/70Hz, 800 x 600/60Hz) However, if the signal differs, the screen may go blank while the power LED is on. Refer to the video card manual and adjust the screen as follows.

Table 1. Preset Timing Modes

 

 

 

 

Horizontal

Vertical

Pixel Clock

Sync Polarity

Display Mode

Frequency

Frequency

(MHz)

(H/V)

 

(kHz)

(Hz)

 

 

 

IBM, 640 x 350

31.469

70.086

25.175

+/-

IBM, 640 x 480

31.469

59.940

25.175

-/-

IBM, 720 x 400

31.469

70.087

28.322

-/+

MAC, 640 x 480

35.000

66.667

30.240

-/-

MAC, 832 x 624

49.726

74.551

57.284

-/-

MAC, 1152 x 870

68.681

75.062

100.00

-/-

VESA, 640 x 480

37.500

75.000

31.500

-/-

VESA, 640 x 480

37.861

72.809

31.500

-/-

VESA, 800 x 600

35.156

56.250

36.000

+/+,-/-

VESA, 800 x 600

37.879

60.317

40.000

+/+

VESA, 800 x 600

46.875

75.000

49.500

+/+

VESA, 800 x 600

48.077

72.188

50.000

+/+

VESA, 1024 x 768

48.363

60.004

65.000

-/-

VESA, 1024 x 768

56.476

70.069

75.000

-/-

VESA, 1024 x 768

60.023

75.029

78.750

+/+

VESA, 1152 x 864

67.500

75.000

108.00

+/+

VESA, 1280 x 1024

63.981

60.020

108.00

+/+

VESA, 1280 x 1024

79.976

75.025

135.00

+/+

Horizontal Frequency

The time to scan one line connecting the right edge to the left edge of the screen horizontally is called Horizontal Cycle and the inverse number of the Horizontal Cycle is called Horizontal Frequency. Unit: kHz

Vertical Frequency

Like a fluorescent lamp, the screen has to repeat the same image many times per second to display an image to the user. The frequency of this repetition is called Vertical Frequency or Refresh Rate. Unit: Hz