Samsung SyncMaster 700s Plus Service Manual page 9

3-3 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
VGA2/70 Hz
720 x 400
Timing
fH (kHz) 31.469
A µsec 31.778
B µsec 3.813
C µsec 1.907
D µsec 25.422
E µsec 0.636
fv (Hz) 70.087
O msec 14.268
P msec 0.064
Q msec 1.080
R msec 12.711
S msec 0.413
Clock
Freq. 28.322
(MHz)
Polarity
H.Sync Negative
V.Sync Positive
Remark Separate
Separate Sync
Horizontal
Video
Video
C D E
C D E
Sync Sync Sync
B
B
A
A
A : Line time total
C : Back porch
E : Front porch
CKG7507L
Table 3-1. Timing Chart
VGA3/60 Hz 640/75 Hz
640 x 480 640 x 480
31.469 37.500
31.778 26.667
3.813 2.032
1.907 3.810
25.422 20.317
0.636 0.508
59.940 75.000
16.683 13.333
0.064 0.080
1.048 0.427
15.253 12.800
0.318 0.027
25.175 31.500
Negative Negative
Negative Negative
Separate Separate
Vertical
Video
Video
Q Q R R S S
Sync Sync Sync
P P P
O O
O
B : Horizontal sync width
D : Active time
VESA
800/75 Hz 800/85Hz 1024/75 Hz
1024 x 768
800 x 600 800 x 600
46.875 53.674
21.333 18.631
1.616 1.138
3.232 2.702
16.162 14.222
0.323 0.569
75.000 85.061
13.333 11.756
0.064 0.056
0.448 0.503
12.800 11.179
0.021 0.019
49.500 56.250
Positive Positive
Positive Positive
Separate Separate
A
Horizontal
B
O : Frame time total
Q : Back porch
S : Front porch
3 Product Specifications
Apple MAC.
1024/85 Hz 832/75 Hz
1024 x 768 832 x 624
60.023 68.677
16.660 14.561
1.219 1.016
2.235 2.201
13.003 10.836
0.203 0.508
75.029 84.997
13.328 11.765
0.050 0.044
0.466 0.524
12.795 11.183
0.017 0.015
78.750 94.500
Positive Positive
Positive Positive
Separate Separate Composite
H/V Composite Sync
VIDEO
Q
R S
Vertical
P
O
P : Vertical sync width
R : Active time
49.726
20.110
1.117
3.910
14.524
0.559
74.551
13.414
0.060
0.784
12.549
0.020
57.284
Negative
Negative
3-3