Timing Chart - Samsung PN15VT / VO Service Manual

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
VGA3/60 Hz VGA2/70 Hz
640 x 480 720 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) 59.940
O msec 16.683
P msec 0.064
Q msec 1.048
R msec 15.253
S msec 0.318
Clock
Frequency 25.175
(MHz)
Polarity
H.Sync Negative Negative
V.Sync Negative Positive
Remark Separate Separate
Separate Sync
Horizontal
Video
Video
C C D D E E
Sync Sync Sync
B
B
A
A
A : Line time total
C : Back porch
E : Front porch
PN15VT/VO
PN15HT/HO
Table 2-1. Timing Chart
640/85 Hz
640/75 Hz
640 x 480 640 x 480
31.469 43.269
37.500
31.778 26.667 23.111
3.813 1.556
2.032
1.907 2.222
3.810
25.422 17.778
20.317
0.636 1.556
0.508
70.087 85.008
75.000
14.268 13.333 11.764
0.064 0.671
0.080
1.080 0.578
0.427
12.711 11.093
12.800
0.413 0.023
0.027
28.322 36.000
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
1024/60 Hz
800/75 Hz
800/85 Hz
1024 x 768
800 x 600 800 x 600
(PN15VT/VO)
46.875
48.363
53.674
21.333
20.677
18.631
1.616
2.092
1.138
3.232
2.462
2.702
16.162 15.754
14.222
0.323
0.569 0.369
75.000
60.004
85.061
13.333
16.666
11.756
0.064
0.124
0.056
0.448 0.600
0.503
12.800 15.880
11.179
0.021
0.062
0.019
49.500
65.000
56.250
Positive Negative
Positive
Positive
Negative
Positive
Separate
Separate
Separate
O : Frame time total
Q : Back porch
S : Front porch
2 Product Specifications
1024/85 Hz
1024/75 Hz
1024 x 768
1024 x 768
(PN15HT/HO)
(PN15HT/HO)
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
P : Vertical sync width
R : Active time
2-3