Factory Preset Display Modes; Theory Of Operation; Video - ViewSonic N1750w SERIES Service Manual

1.5 Factory preset display modes

Mode
VESA VGA
SVGA
VESA XGA
MAC16"
MAC19"
SVGA CVT

2. Theory of operation

This section describes the operation theory of the N1750W LCD TV.

2.1 Video

"Analog Device" AD9883 shall provide analog to digital converter for this product. Video decoder shall be provided by
"Micronas" with a model number of VPC3230, and the de-interlace of this product shall be provided by "Sunplus" with a Model
Number of SPV302. The following tables define this product's video specifications.
Input Parameter
CVBS Characteristics:
Video Amplitude Signal
DC Level Sync Pulse:
S-Video Characteristics:
Video Amplitude Signal
Y, Pb, Pr Characteristics:
Video Amplitude Signal
Video Bandwidth
RGB Characteristics:
Signal Type
Sync Type
Input Signal Rating
Sync Level:
Frequency Range
Pixel Color
DDC Compliance
EDID Data Table
ViewSonic Corporation
Resolution
Nominal Frequency
640x480
640x480
640x480
720x400
800x600
800x600
800x600
1024x768
832x624
1024x768
1280x768
0.7(min.) – 1.1(max.) V
Typical. 0.3 V
Y : 1.0Vp-p W / Neg. Sync (IN 75 Ω )
C : 0.285Vp-p (IN 75 Ω )
Y:1.0Vp-p (IN 75 Ω)
Pb:0.7 Vp-p(IN 75 Ω),Pr:0.7 Vp-p (IN 75 Ω)
NTSC: 6 MHz Maximum
Analog VGA
TTL, Separate Sync, with 4.7KΩ pull-down resistors
1250mV Max without damage to the product, 0-700 mV Full Range
2.5-5.25 V
Horizontal: 31.5-61K Hz, Vertical: 60-75 Hz
16 M
DDC2B Compliant
See Appendix B
Horizontal
Nominal Frequency
(KHz)
31.5
37.9
37.5
31.5
37.9
48.1
46.9
48.4
49.725
60.24
47.8
Specification
8
Vertical
(Hz)
60
72
75
70
60
72
75
60
74.55
75
60
N1750w