Timing Chart - Samsung 741MP Service Manual

14-5 Timing Chart

This section of the service manual describes the timing that the computer industry recognizes as standard for computer-
generated video signals.
Mode
IBM
VGA2/ VGA3/
70 Hz 60 Hz
720 x 400 640 x 480
Timing
31.469
fH (kHz) 31.469
31.777
A μsec 31.778
3.813
B μsec 3.813
1.589
C μsec 1.589
26.058
D μsec 26.058
0.318
E μsec 0.318
70.087
fV (Hz) 59.940
14.268
O msec 16.683
0.064
P msec 0.064
0.858
Q msec 0.794
13.155
R msec 15.761
0.191
S msec 0.064
Clock
28.322
Freq. 25.175
(MHz)
Polarity
Negative
H.Sync Negative
Positive
V.Sync Negative
Separate
Remark Separate
Separate Sync
Video
C D E
Sync
B
A
A : Line time total
C : Back porch
E : Front porch
640/75 Hz 800/60 Hz 800/75 Hz
640 x 480 800 x 600 800 x 600
37.500 35.879 46.875
26.667 26.400 21.333
2.032 3.200 1.616
3.810 2.200 3.232
20.317 20.000 16.162
0.508 1.000 0.323
75.000 60.317 75.000
13.333 16.579 13.333
0.080 0.106 0.064
0.427 0.607 0.448
12.800 15.840 12.800
0.027 0.026 0.021
31.500 40.000 49.500
Negative Positive Positive
Negative Positive Positive
Separate Separate Separate
Video
Q R S
Sync
P
O
B : Horizontal sync width
D : Active time
VESA
1024/60Hz 1024/75Hz 1280/60Hz
1024 x 768 1024 x 768 1280x1024
48.363 60.023
63.981
20.677 16.660 11.852
2.092 1.219 1.037
2.235
2.462 2.296
15.754 13.003 9.259
0.369 0.203 0.444
75.029
60.004 60.020
16.666 13.328 60.020
0.124 0.050 0.047
0.466
0.600 0.594
15.880 12.795 15.630
0.062 0.017 0.016
75.000 78.750 108.000
Negative Positive Positive
Negative Positive Positive
Separate Separate Separate
H/V Composite Sync
Sync-on-Green
O : Frame time total
Q : Back porch
S : Front porch
14 Reference Infomation
1280/75Hz 1440/60Hz 1440/75Hz
1280x1024 1440x900 1440x900
(Analog Only)
79.976 55.935 75.000
12.504 17.878 14.157
1.067 1.427 1.112
1.837 2.178 1.814
9.481 13.521 10.530
0.119 0.751 0.702
75.025 59.887 75.000
13.329 16.698 13.336
0.038 0.107 0.085
0.475 0.447 0.467
12.804 16.090 12.741
0.013 0.054 0.042
135.000 106.500 136.750
Positive Negative Negative
Positive Positive Positive
Separate Separate Separate
P : Vertical sync width
R : Active time
14-9