![background image](http://html.mh-extra.com/html/viewsonic/vx912/vx912_service-manual_1020048028.webp)
e)
Panel Power Sequencing ( PANEL_PW12,3) ( Pin 16, 18) : The MTV312 has two dedicated outputs
VDDCTRL1 and 2 ( Pin32 and Pin3) to control LCD power sequencing once data and control signals
are stable.
f)
Panel interface (Pin73~94) : The RTD2523 driver interface is highly programmable. It supports dual bus /
dual port for SXGA drivers.
6.1.2 Power Regulator AIC1563 (U2),AIC1117CY(U1,U3) : The AIC1563 is a monolithic control IC containing
the primary functions required for DC to DC converters. The device consists of an internal temperature
compensated reference, comparator, controlled duty cycle.
Oscillator with an active current sense circuit. Desired output voltage are determined by the equation,
Volt = 1.25 ( 1 + R11 / R12), In this case, the output voltage are 5Volts
The AIC1563 is a low dropout positive adjustable regulator with minimum of 1A output current capability.
So it is well suited for 3.3 V and 2.5 V Regulator
.
6.1.3 Power Regulator AIC1117CY (U1,U3) : The AIC1117CY is a monolithic control IC containing the
primary functions required for DC to DC converters. The device consists of an internal temperature
compensated reference, comparator, controlled duty cycle.
Oscillator with an active current sense circuit. Desired output voltage are determined by the equation,
Volt = 1.25 ( 1 + R17 / R15), In this case, the output voltage are 2.5 Volts for panel power.
6.2 Power (Inverter) Board
This is a specific power (inverter) power board for VE710 monitor 40W 12V 3.5A output power and backlight
which converters 12 Vdc to drive four cold cathode fluorescence tubes.
6.2.1 Inverter Electrical specification described as below.
Rated Input Voltage
12Vdc
Input Voltage Range
11.4 ~ 12.6 Vdc
Input Current
<2A
Input
On / Off control Voltage
2~3.3 for on , 0~1 for off
Rated Output Strike-on Voltage
1500Vrms
Rated Output Voltage
710Vrms at 7mA
Rate Output Frequency
40~50KHz
Output
Rated Ourput Current
7~8 mA
6.2.2 Power
This is a general purpose AC / DC adapter which converter 90~240 Vac to a stabilized DC voltage 12 V with
rated output current of 4.16A . Electrical specification described as below.
Rated Input Voltage
90~240 Vac , 50 / 60Hz
Operation Input Voltage
90~260 Vac , 47 ~ 63Hz
Input Current
<1.5A
Inrush Current
<100A@120Vac
Standby Input Voltage
12Vdc
Output Voltage Regulation
+/-5%
Output Ripple & Noise
120mVp-p
Rate Output Current
<3.5A
Turn-on delay
<3secs
25
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Содержание VX912
Страница 38: ...Pattern 5 Pattern6 Pattern 7 Pattern 8 Pattern 9 35 ViewSonic Corporation Confidential Do Not Copy VX912 ...
Страница 51: ...1 Display color abnormal 6 Trouble Shooting Flow Chart 48 ViewSonic Corporation Confidential Do Not Copy VX912 ...
Страница 52: ...2 Monitor can not power on 49 ViewSonic Corporation Confidential Do Not Copy VX912 ...
Страница 53: ...3 Monitor white screen 50 ViewSonic Corporation Confidential Do Not Copy VX912 ...
Страница 54: ...4 Monitor black screen 51 ViewSonic Corporation Confidential Do Not Copy VX912 ...
Страница 55: ...5 Analog input always shows NO SIGNAL 52 ViewSonic Corporation Confidential Do Not Copy VX912 ...
Страница 56: ...6 Digital input always shows NO SIGNAL 53 ViewSonic Corporation Confidential Do Not Copy VX912 ...
Страница 60: ...57 ViewSonic Corporation Confidential Do Not Copy VX912 8 Exploded Diagram And Spare Parts List ...
Страница 78: ...11 PCB Layout Diagrams 75 ViewSonic Corporation Confidential Do Not Copy VX912 Main Board Control Board ...