Samsung SyncMaster 570B TFT Service Manual page 6

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
VGA1/70 Hz
640 x 350
Timing
fH (kHz) 31.469
A µsec 31.778
3.813
B µsec
1.589
C µsec
D µsec 26.058
E µsec 0.318
fV (Hz) 70.086
14.268
O msec
0.064
P msec
1.716
Q msec
R msec 11.504
S msec 0.985
Clock
Frequency 25.175
(MHz)
Polarity
Positive
H.Sync
Negative
V.Sync
Separate
Remark
Separate Sync
Horizontal
Video
Video
C D
C D E
Sync Sync Sync
B
B
A
A
A : Line time total
C : Back porch
E : Front porch
SyncMaster 570B TFT / 580B TFT
IBM
VGA2/70 Hz
720 x 400
31.469
31.777
3.813
1.589
26.058
0.318
70.087
14.268
0.064
0.858
13.155
0.191
28.322
Negative
Positive
Separate
Vertical
Video
Video
E Q R
Q R
Sync Sync Sync
P P
P
O O
O
B : Horizontal sync width
D : Active time
Table 2-1. Timing Chart
VGA3/60 Hz
640/72 Hz
640 x 480
640 x 480
31.469 37.861
31.778 26.413
3.813
1.270
1.589 3.810
26.058 20.825
0.318 0.508
59.940 72.809
16.683
13.735
0.064 0.079
0.794 0.528
15.761 13.100
0.064 0.026
25.175 31.500
Negative Negative
Negative Negative
Separate Separate
S
S
O : Frame time total
Q : Back porch
S : Front porch
2 Product Specifications
VESA
800/56 Hz
640/75 Hz
640 x 480 800 x 600
35.156
37.500
28.444
26.667
2.000
2.032
3.810 3.556
22.222
20.317
0.667
0.508
56.250
75.000
17.778
13.333
0.080 0.057
0.626
0.427
17.067
12.800
0.028
0.027
36.000
31.500
Positive
Negative
Negative
Negative
Separate
Separate
P : Vertical sync width
R : Active time
800/60 Hz
800 x 600
37.879
26.400
3.200
2.200
20.000
1.000
60.317
16.579
0.106
0.607
15.840
0.026
40.000
Positive
Positive
Separate
2-3