Samsung 203B Service Manual - Page 22

14 Reference Infomation 14-3 Timing Chart - This section of the service manual describes the timing that the computer industry recognizes as standard for computer-generated video signals. Table 14-1 Timing Chart Mode IBM VESA Timing VGA2/ 70 Hz VGA3/ 60 Hz 640/75 Hz 800/60 Hz 800/75 Hz 1024/60 Hz 1024/75 Hz 1280/60 Hz 1280/75 Hz 720 x 400 640 x 480 640x480 800x600 800x600 1024x768 1024x768 1280x1024 1280x1024 fH (kHz) 31.469 31.469 37.500 37.879 46.875 48.363 60.023 63.981 79.975 A μsec B μsec C μsec 31.777 3.813 1.589 31.778 3.813 1.589 26.667 2.032 3.810 26.400 3.200 2.200 21.333 1.616 3.232 20.677 2.092 2.462 16.660 1.219 2.235 11.852 1.037 2.296 12.504 1.067 1.837 D μsec E μsec fV (Hz) 26.058 0.318 70.087 26.058 0.318 59.940 20.317 0.508 75.000 20.000 0.000 60.317 16.162 0.323 75.000 15.754 0.369 60.004 13.003 0.203 75.029 9.259 0.000 60.020 9.481 0.119 75.025 O msec 14.268 16.683 13.333 16.579 13.333 16.666 13.328 16.005 13.329 P msec Q msec R msec 0.064 0.858 13.155 0.064 0.794 15.761 0.080 0.427 12.800 0.106 0.607 15.840 0.064 0.448 12.800 0.124 0.600 15.880 0.050 0.466 12.795 0.047 0.594 15.630 0.038 0.475 12.804 S msec 0.191 0.064 0.027 0.0261 0.021 0.062 0.017 0.016 0.013 Clock Freq. (MHz) 28.322 26.175 31.500 40.000 49.500 75.000 78.750 108.000 135.000 Polarity H.Sync V.Sync Negative Negative Negative Positive Positive Negative Positive Positive Positive Positive Negative Negative Positive Positive Negative Positive Positive Positive Remark Separate Separate Separate Separate Separate Separate Separate Separate Separate Separate Sync H/V Composite Sync Video C D E Sync B A A : Line time total C : Back porch E : Front porch Video Q R S Sync P O Sync-on-Green B : Horizontal sync width D : Active time O : Frame time total Q : Back porch S : Front porch P : Vertical sync width R : Active time 14-5