ViewSonic VS12335-1M, Service Manual

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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 Y : 1.0Vp-p W / Neg. Sync (IN 75 Ω )
C : 0.285Vp-p (IN 75 Ω )
Y, Pb, Pr Characteristics:
Video Amplitude Signal 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: 6 MHz Maximum
HDMI Characteristics Panel Link T.M.D.S HDMI-1.3
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 2.2K
Ω
pull-down resistors
1250mV Max without damage to the product, 0-700 mV Full Range
2.5-5.25 V
Horizontal: 30-82K Hz, Vertical: 55-75 Hz
16.7 M
DDC2B Compliant, Rev 1.3
Refer to Appendix
3. Audio
Audio amp of this product shall be provided by “YAMAHA” with a Model Number of YDA148 .
“MST” MSD2248AL for VT2430-1M 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
Tuner Input Base band Input
Power Output Max Rating 5W at 10 % T.H.D Distortion 5W at 10% T.H.D Distortion
Speaker Impedance main speaker :8 Ω main speaker :8 Ω
Line In
NTSC: BTSC Mono / Stereo(standard)
PAL: FM Mono / Stereo(standard)
500 mV rms (Typ)
1.6 V rms (Max)
Impedance: 600 ohms
Line Out earphone jack
500 mV rms
15 mW@32
Ω
Flatness of Amplitude
Response
+/- 3 db (at 1KHz @1W) +/- 3 db (at 1KHz @1W)
Total Harmonic Distortion
(Po=0.1 to 1 W, f=1KHz)
<2% <2%
Signal to Noise:
12 dB (100Hz to 1KHz)
8 dB (1kHz to 10kHz)
35 dB (100Hz to 10 kHz)
ViewSonic Corporation 4 VT2430-1M
Confidential - Do Not Copy