Samsung PN17K Series Service Manual page 7

2-3 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 VGA3/60 Hz
720 x 400 640 x 480
Timing
fH (kHz) 31.469
A µsec 31.777
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
Frequency 28.322
(MHz)
Polarity
H.Sync Negative Negative
V.Sync Positive Negative
Remark Separate 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
PN17K*/PN17J*
Table 2-1. Timing Chart
640/75 Hz
640/85 Hz
640 x 480
640 x 480
(PN17K*)
31.469 37.500 43.269
31.778 23.111
26.667
3.813 1.556
2.032
1.907 2.222
3.810
25.422 17.778
20.317
0.636 1.556
0.508
59.940 75.000 85.008
16.683 11.764
13.333
0.064 0.671
0.080
1.048 0.578
0.427
15.253 11.093
12.800
0.318 0.027 0.023
25.175 31.500 36.000
Negative
Negative
Negative
Negative
Separate Separate
Vertical
Video Video
Q R S
Q R S
Sync Sync Sync
P P
P
O O
O
B : Horizontal sync width
D : Active time
VESA
800/75 Hz
800/85 Hz 1024/75 Hz
800 x 600
800 x 600 1024 x 768
53.674 60.023
46.875
18.631 16.660
21.333
1.616 1.138
3.232 2.702
14.222
16.162 13.003
0.569
0.323
85.061 75.029
75.000
13.333 11.756 13.328
0.064 0.056
0.503
0.448
11.179 12.795
12.800
0.019
0.021
56.250 78.750
49.500
Positive
Positive Positive
Positive Positive
Positive
Separate Separate
Separate
O : Frame time total
Q : Back porch
S : Front porch
2 Product Specifications
1280/75 Hz
1024/85 Hz
1280 x 1024
1024 x 768
(PN17J*)
68.677
79.976
14.561
12.504
1.219
1.016
1.067
2.235
2.201
1.837
10.836
9.481
0.203
0.508
0.119
84.997
75.025
11.765
13.329
0.050
0.044
0.038
0.466
0.524
0.475
11.183
12.804
0.017
0.015
0.013
94.500
135.000
Positive
Positive
Positive
Positive
Separate
Separate
P : Vertical sync width
R : Active time
2-3