Service manual

2. Video
Built-in A/D converter shall provide analog to digital converter for this product.
Input Parameter Specification
CVBS Characteristics:
Video Amplitude Signal
DC Level Sync Pulse
0.7(min.) – 1.1(max.) V
Typical. 0.3 V
S-Video Characteristics:
Video Amplitude Signal
DC Level Sync Pulse
Y : 1.0Vp-p W / Neg. Sync (IN 75 Ω )
C : 0.285Vp-p (IN 75 Ω )
Y, Pb, Pr Characteristics:
Video Amplitude Signal
DC Level Sync Pulse
Y:1.0Vp-p (IN 75 Ω)
Pb:0.7 Vp-p(IN 75 Ω),Pr:0.7 Vp-p (IN 75 Ω)
Video Bandwidth NTSC/ATSC: 6 MHz Maximum
HDMI Characteristics Panel Link T.M.D.S HDMI-1.1
RGB Characteristics:
Signal Type
Sync Type
Input Signal Rating
Sync Level:
Frequency Range
Pixel Color
DDC Compliance
EDID Data Table
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: 30-80K Hz, Vertical: 50-75 Hz
16 M
DDC2B Compliant, Rev 1.3
See Appendix B
3. Audio
Audio amp of this product shall be provided by “ESMT” with a Model Number of 8256A “MTK”
MT8202 for N4251w-M shall be used as sound processor. In addition, a pair of speakers shall be
integrated within this product. The audio signals of this product shall comply with the specification
listed in the following table.
Parameter Specification
Phone Jack out
Tuner Input Base band Input
Speaker Power Output Max
Rating
10 W x 2 at 10% T.H.D
Distortion
10W x 2 at 10% T.H.D.
Distortion
Speaker Impedance
main spk :3 Ω + 3 Ω
Treble spk :5.2 Ω
main spk :3 Ω + 3 Ω
Treble spk :5.2 Ω
Line In Per Tuner Spec
500 mV rms (Typ)
1.6 V rms (Max)
Impedance: 600 ohms
Line Out
500 mVrms +/- 10%
@1K Hz tone (with +/-25k Hz
deviation at input, volume
with non-attenuation and
loading with 47k Ohm)
500 mVrms +/- 10%
@1K Hz tone (with +/-25k Hz
deviation at input, volume
with non-attenuation and
loading with 47k Ohm)
Flatness of Amplitude Response
(100Hz ~ 10KHz)
+/- 3 db (at 1KHz @1W) +/- 3 db (at 1KHz @1W)
Total Harmonic Distortion
(1KHz @1W)
2% 2%
Signal to Noise (1KHz @1W) 30 dB (40Hz to 15KHz) 40dB(400Hz to 20 kHz)
ViewSonic Corporation Confidential - Do Not Copy N4251w-1M
4