ViewSonic VP201b-1 Service Manual page 12

6.2 IC954 EEPROM data see Appendix-B item a.6.3 For the EDID data see Appendix B. VP2000s
analog & DVI-A are the same as item h. For the DVI-D input 1 see item i.
7. USB test (VP201s/b only)
7.1 Use a USB test hub such as "UPT2 USB2.0 8-port tester" to test USB up stream and down stream
transfers. Each port must pass the test.
7.2 Use a PC to check the USB VID, which should be 0543 , and the PID, which should be 1169 .
7.3 For USB test settings see Appendix E.
8. For auto alignment, it is necessary to execute the auto image adjust command for 3 DOS modes (640x350,
720x400, 640x400).
E. Analog and Digital timing chart.
Mode No.
Mode Name
Horizontal Freq.
Video clock Freq.
Sync. Polarity
H. total (Dots)
H. sync. (Dots)
H. back porch (Dots)
H. active (Dots)
H. front porch (Dots)
Vertical Freq. (Hz)
Sync. Polarity
V. total (Lines)
V. sync. (Lines)
V. back porch (Lines)
V. active
(Lines)
V. front porch (Lines)
ViewSonic Corporation
1 2 3
TEXT VGA VESA
640 x 640 x 640 x
350 400 480
31.468 31.468 24.688 31.469 35.000 37.861 37.500 43.269 31.469 35.156
25.175 25.175 19.75
＋ － －
800 800 800
96 96 64
48 48 80
640 640 640
16 16 16
70.087 70.087 49.673 59.940 66.667 72.809 75.000 85.008 70.087 56.250
－ ＋ ＋
449 449 497
2 2 4
60 35 10
350 400 480
37 12 3
4 5 6
VESA MAC VESA
640 x 640 x 640 x
480 480 480
25.175 30.240 31.500 31.500 36.000 28.322 36.000
－ － －
800 864 832
96 64 40
48 96 128
640 640 640
16 64 24
－ － －
525 525 520
2 3 3
33 39 28
480 480 480
10 3 9
Confidential - Do Not Copy
9
7 8 9
VESA VESA TEXT
640 x 640 x 720 x
480 480 400
－ － －
840 832 900
64 56 108
120 80 54
640 640 720
16 56 18
－ － ＋
500 509 449
3 3 2
16 25 35
480 480 400
1 1 12
VP201b/s-1
10
VESA
800 x
600
＋
1024
72
128
800
24
＋
625
2
22
600
1