Factory Preset Timing Table - ViewSonic VA702/b Service Manual

high frequency noise. Signal HSYNC and VSYNC input through CN102 #13 and #14, and C119, R119,
C120, R120 filtering. Then the analog signal enters U104, and then U104 deals with it internally. In
addition, TVS101, TVS102, TVS103 (the three are BAV99), TVS104, TVS105, TVS106, TVS107 (they
are constant voltage diode of 5V6) are ESD protector. Signal DDC-SCL inputs via CN102 #15, and then
passes through TVS107 for ESD protection, goes into EDID EEPROM IC U103. Signal DDC-SDA
inputs via CN102 #12, and then passes through TVS106 for ESD protection, goes into EDID EEPROM
IC U103. CN102 #5 is defined as cable detect pin, this detector realizes via R107 and U105 #4. The
PC-5V of U103 is supplied by PC via CN103 #9 with D103 for ESD protection, or supplied by Monitor
self via D104.U103 is an EEPROM IC, which is a kind of memory and used for saving EDID data.
2.3.5 Button Control
Button "Key-Power" is defined as power on/off, which is connected to U105 #24 through CN106 #4.
Button "Key-2" is defined as two functions of selecting and adjustment, which is connected to U105
#25 through CN106 #1.
Button "Key-Up" is defined as plus, which is connected to U105 #26 through CN106 #3.
Button "Key-Down" is defined as minus, which is connected to U105 #27 through CN106 #5.
Button "Key-1" is defined as two functions of menu and exit, which is connected to U105 #28 through
CN106 #2.
LED indicator on the front bezel is defined as follows:
a. When press button "Key-Power", U105 #6 is pulled down and U105 #7 is pulled high, so Q104 is
conducted and the LED indicator is green.
b. When in power-saving mode, U105 #6 is pulled high and U105 #7 is pulled down, so Q105 is
conducted and the LED indicator is orange.

3. FACTORY PRESET TIMING TABLE

Item
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
ViewSonic Corporation
Resolution
640 x 350
640 x 400
640 x 400
640 x 480
43.27kHz
720 x 400
800 x 600
832 x 624
1024 x 768
68.67kHz
1152 x 870
1280 x 1024
79.97kHz
1280 x 720
H-Freq. V-Freq.
(KHz) (Hz)
31.5kHz 70Hz
31.5kHz 60Hz
31.5kHz 70Hz
24.7kHz 50Hz
31.5kHz 60Hz
35.0kHz 67Hz
37.9kHz 72Hz,
37.5kHz 75Hz,
85Hz
31.5kHz 70Hz
35.1kHz 56Hz
37.9kHz 60Hz
48.1kHz 72Hz
46.9kHz 75Hz
53.7kHz 85Hz
49.7kHz 75Hz
48.4kHz 60Hz
56.5kHz 70Hz
58.1kHz 72Hz
60.0kHz 75Hz
85Hz
68.6kHz 75Hz
63.4kHz 60Hz
75Hz
45kHz 60Hz
7
Dot Clock
(MHz)
25.2
25.2
25.2
19.8
25.2
30.2
31.5
31.5
36.0
28.3
36.0
40.0
50.0
49.5
56.3
57.3
65.0
75.0
78.5
78.8
94.5
100
108
135
74.2
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