ViewSonic N4285p-4M, Service Manual

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Parameter Specification
LCD Type
a-Si TFT Active Matrix Wide Color, Transmissive Mode, Normally
Black
LCD Interface 2-Channel LVDS
Resolution (Native) 1920x1080
Display Area 42” diagonal; 930.24 (H) x 523.26 (V) mm.
Pixel Pitch 0.1615(H) × 0.4845(V) mm
Viewing Angle
H = +/- 88
°
, V = +/- 88
°
with CR ≥ 20 (Typical)
Contrast Ratio 4000:1 (Typical)
Brightness 500 nits (Typ.);
Response Time 6.5ms, (Typical), g-g
Color saturation NTSC 72% Typ
Brightness Uniformity 1.3 (Max), measured per panel spec.
Chromaticity (CIE1931) White-x:0.280,White-y:0.285 (Standard Mode Only)
Colors 16.7M (8-bit)
Surface Treatment Anti-glare coating (Haze 11%)
Backlight 12 CCFLs (Cold cathode Fluorescent Lamp)
Panel Acceptance
Refer to the panel acceptance criteria specification.
Note: Intermittent and/or Display Pattern defects which result in
further bright or dark dots will be counted individually against the
above specification.
Front Screen Artifacts
VS Standard:
a.) No Visible Streaking, Sag or Smearing artifacts when driven by
the specified video cards (see 7.1 General Test Equipment) in the
primary mode (VGA at 60 Hz) and after user adjustment
b.) No image drift or lose fine-tune settings due to panel temperature
change
Note: Panel performance characteristics “ MUST BE” met in all display modes/inputs at standard test
conditions.
1. RF Tuner
RF tuner of this product shall be provided by “Samsung DTVS205EH201A” for NTSC/ATSC. The
following table defines this tuner specification.
Parameter Specification
RF Input Level 45 ~ 85dBµV
RF Tuning Range
NTSC/ATSC: 55.25 to 801.25 MHz, 2-69 Channels for Off-Air
and 1-125 Channels for CATV
RF Tuner Sensitivity (S/N Ratio
at un-weight)
45 dB (min.)
Channel Bandwidth NTSC/ATSC: 6 MHz Maximum
CVBS Characteristics:
Video Amplitude Signal
DC Level Sync Pulse
0.7(min.)–1.1(max.) V
Typical. 0.35 V
Audio Characteristics:
AF Output Level Measured via
LP 20 kHz Filter, RMS Decoder,
75us De-emphasis
THD
S/N
Typical. 0.35Vrms
10% (max.)
44 dB (min.)
Compatible system TUNER
NTSC/ATSC
Compatible system AV
NTSC M
2. Specification
ViewSonic Corporation
Confidential - Do Not Copy
N4285p-4M
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