Service manual

Parameter Specification
LCD Type
a-Si TFT Active Matrix Wide Color, Transmissive Mode, Normally
Black
LCD Interface 1-Channel LVDS
Resolution (Native) WXGA, 1366 x 768
Display Area 930.25(H)*523.01(V)42.02 inch diagonal mm
Pixel Pitch 0.68 (H) x 0.68 (V) mm
Viewing Angle
H = +/- 89°, V = +/- 89° with CR≥10(Typical)
Contrast Ratio 1200:1 (Typ);
Brightness 500 nits (Typical), 400 nits(Min.);
Response Time
TrR:10ms, TrD:6ms (Typ)
TrR:17ms, TrD:10 ms (max)
Response Time (Gray to
Gray)
8 ms (Typ), gray to gray
Colors 16.7M (8-bit)
Surface Treatment AG,3H
Colors 16.7M (8-bit)
Surface Treatment Hard coating (3H)
Backlight 16 CCFLs
Preset Color Panel Default
Gray Scale 256
Rated Life (Backlight) > 50 KHrs* (Typ)
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 & 60 Hz) and after user adjustment
b.) No image drift or lose fine-tune settings due to panel temperature
change.
Panel Acceptance Spec
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.
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 “T Vision” TVF85P3-CF.
The following table defines this tuner specification.
Parameter Specification
RF Tuning Range NTSC & ATSC: 55.25MHz to 803 MHz ,
RF Tuner Sensitivity (S/N Ratio at un-weight) 44 dB (min.)
Channel Bandwidth NTSC & ATSC: 6 MHz Max
0.7(min.)–1(max.) V
CVBS Characteristics:
Video Amplitude Signal
DC Level Sync Pulse 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.)
2. Specification
ViewSonic Corporation Confidential - Do Not Copy N4251w-1M
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