Acer AL1917W Service Manual page 15

Acer
2.1.1 VESA Analog
The video input consists of red, green, and blue signals. The video signals are analog levels, where
0V corresponds to black and 700mV is the maximum signal amplitude. Input impedance of video
pins is 75 ohm ±1%.
Sync signal input
The capability of sync signal inputs shall include separate sync. Input impedance: 2k2 ohms the
signals are defined as follow:
Separate sync
2.1.2 Input signal mode
PRESET TEST MODE TIMING
Resolution
640 x 480
800 x 600
1024 x 768
1152 x 864
1280 x 960
1280 x 1024
1440 x 900
720 x 400
640 x 480
832 x 624
1024 x 768
1152 x 870
1280 x 1024
1024 x 768
1152 x 900
1280 x 1024
1280 x 800
2.1.3 VGA signal cable
15 pin D-sub VGA connector of signal cable.
2.1.4 Interface
Analog signal: The input signals are applied to display through D-sub cable.
TTL level, Positive/Negative
H-Freq. V-Freq.
(kHz) (Hz)
31.5 60.0
37.9 72.0
37.5 75.0
35.1 56.0
37.9 60.0
48.1 72.0
46.9 75.0
48.4 60.0
56.5 70.0
60.0 75.0
67.5 75.0
60.0 60.0
64.0 60.0
80.0 75.0
55.9 60.0
75.0 75.0
31.5 70.0
35.0 66.7
49.7 74.6
60.2 75.0
68.7 75.0
64.0 60.0
80.0 75.0
48.3 60.0
53.6 66.0
56.6 70.0
61.8 66.0
71.7 67.2
81.1 76.0
60.0
49.7
58.4 70.0
60.2 72.0
62.7 75.0
Dot Clock
(MHz)
25.175
31.500
31.500
36.000
40.000
50.000
49.500
65.000
75.000
78.750
108.000
108.000
108.000
135.000
106.500
136.750
28.300
30.200
57.300
80.000
100.000
108.000
135.000
64.130
70.400
74.250
94.880
117.010
134.990
14
Service Manual
Mode
VESA Standard
US Text
Power Macintosh
series
Sun Ultra series
Industrial Standard