4.1 Power supply (DC/DC Converter):
4.1.1 IC251 BA9741 is a switching regulator controller that uses a PWM method. It is used for DC to
DC step-down conversion. It converts 24V DC into regulated and stable output voltages of 18V
and
5V.
4.1.2
Regulator:
IC252
converts
5V
into
regulated and stable O/P 3.3V.
IC253 converts 5V into regulated and stable O/P 1.8V
IC255
converts
5V
into
regulated and stable O/P 3.3V.
IC256 converts 5V into regulated and stable O/P 2.5V.
4.2 DDC data select:
4.2.1 IC601 (AT24C02) saves D-SUB DDC data.
4.2.2 IC604 (AT24C02) saves DVI-D, DDC data.
4.2.3 IC605 (AT24C02) saves DVI-A, DDC data.
4.3 D-sub and DVI-A signal select
The VP201s is equipped with two analog signal inputs: D-sub and DVI-A. The user may only choose to
display the signal from one of these ports: D-sub or DVI-A.
IC607 (AD8186) is a R, G, B signal switch IC. If the control signal (RGBSEL) is high, the device will
display the DVI-A signal. If the control signal (RGBSEL) is low, the device will display the D-sub.
4.4 Scalar
The gm1601H is a dual channel graphics and video processing IC for Liquid Crystal Display (LCD) monitors and
televisions incorporating Picture in Picture, up to WUXGA output resolutions. The gm1601H provides all key IC
functions required for image capture, processing and display timing control. On-chip functions include a high speed
triple-ADC and PLL, Ultra-Reliable DVI receiver, high quality zoom, and shrink scaling engines, Motion Adaptive
De-interlacing (MADI), Low Angle Diagonal Interpolation (LADI), an on-screen display (OSD) controller, a 100MHz
on-chip X186 micro-controller (OCM), and a selectable double side TTL or dual channel LVDS transmitter for
interface to displays.
4.5 USB(VP201s/b
only)
IC951(USB20H04) is a 4-Port USB 2.0 Hub controller. It is compliant with the USB 2.0 specification,
enables bus-powered Hi-Speed hub design, and is compatible with On-The-Go (OTG) USB devices. It is
equipped with a serial interface for configuration from EEPROM or micro-controller when the default
settings are not used. Includes integrated termination and pull-up/pull-down resistors, as well as internal
short circuit protection of DP and DM lines. Supports individual or ganged
over-current protection and power control.
18
ViewSonic
Corporation
Co
nfidential
-
Do
Not
Copy
VP201b/s-1
4. Circuit Description
Summary of Contents for VLCDS26064-2W
Page 26: ...5 3 6 Click Gprobe 4 23 ViewSonic Corporation Confidential Do Not Copy VP201b s 1 ...
Page 27: ...24 ViewSonic Corporation Confidential Do Not Copy VP201b s 1 ...
Page 31: ...Connect to D Sub Signal cable 28 ViewSonic Corporation Confidential Do Not Copy VP201b s 1 ...
Page 34: ...31 ViewSonic Corporation Confidential Do Not Copy VP201b s 1 ...
Page 35: ...5 3 9 Open VP2000BATCH 32 ViewSonic Corporation Confidential Do Not Copy VP201b s 1 ...
Page 37: ...5 3 11 Press Enter key 34 ViewSonic Corporation Confidential Do Not Copy VP201b s 1 ...
Page 63: ...60 ViewSonic Corporation Confidential Do Not Copy VP201b s 1 9 Block Diagram ...
Page 65: ...Main Board 62 ViewSonic Corporation Confidential Do Not Copy VP201b s 1 ...
Page 66: ...Main Board 63 ViewSonic Corporation Confidential Do Not Copy VP201b s 1 ...
Page 67: ...Main Key Board 64 ViewSonic Corporation Confidential Do Not Copy VP201b s 1 ...
Page 68: ...DVI Board 65 ViewSonic Corporation Confidential Do Not Copy VP201b s 1 ...
Page 69: ...Power Board 66 ViewSonic Corporation Confidential Do Not Copy VP201b s 1 ...
Page 70: ...Inverter Board 67 ViewSonic Corporation Confidential Do Not Copy VP201b s 1 ...
Page 72: ...Main Board Bottom 69 ViewSonic Corporation Confidential Do Not Copy VP201b s 1 ...
Page 73: ...Power Board 70 ViewSonic Corporation Confidential Do Not Copy VP201b s 1 ...
Page 74: ...Power Board Bottom 71 ViewSonic Corporation Confidential Do Not Copy VP201b s 1 ...
Page 75: ...72 ViewSonic Corporation Confidential Do Not Copy VP201b s 1 Inverter Board ...
Page 76: ...73 ViewSonic Corporation Confidential Do Not Copy VP201b s 1 Inverter Board Bottom ...