Acer MB243WABNS service manual Panel Electrical

< 1.0 lux 10℃

> 24 hours

6 ACER G24

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1. Product Specification (continued)

Table 2

AC to DC Converter Requirements

Input Voltage Range	The operating range shall be from 90 to 132 and 195 to 265 AVC
	sinusoidal for all models specified.
Input Frequency Range	Input power frequency range sha;; be from 47.5 to 63 Hz over the
	specified input voltage range.
	Power consumption for the monitor shall be less than 46W over the
Power Consumption	specified voltage and frequency ranges. In suspend or sleep mode
	the power consumption will be less than 2W.
Line Fuse	The AC input shall be fused and become electrically open as a result
	on an unsafe current level. The fuse many not be user replaceable.
	The power supply shall start and function properly when under full
Initial Cold Start	load, with worst case conditions of input voltage, input frequenct,
	operating temperature, and cold backlight lamps.
	The inrush current must be limited to 30A when operated at
Inrush Current	120VAC, and 50A when operated at 220VAC. Inrush current is
	measured at an ambient temperature of 25oC, with the unit
	temperature stabilized in the power-off.
	The power supply shall be damaged when switched ON for one
Hot Start Cycle	second and OFF for one second for seven consecutive after
	operating for one hour at full load, 25oC, and nominal input line
	voltage.
	The power supply shall contain protection circuitry such that the
Under Voltage	application of an input voltage below the minimum specified in this
	table shall not cause damage to the power supply unit nor cause
	failure of the input.
	The power supply shall operate within IEC 801-4 (± 1KV) and IEC
Line Transient	801-5 (± 2KV) for the domestic U.S. version. The UPS power
	supply shall operate and comply with CE mark.

1.3.8Display Communications Channel

The monitor assembly shall provide a display communications channel that conforms to VESA DDC2Bi hardware requirements. This configuration shall contain the 128-byte EDID file as specified by VESA EDID standard.The monitor should not write to the EDID file for the first two minutes of operation following power-up UNLESS some action taken by the user or the host CPU forces the write (for instance, requesting the serial number via the OSD). Furthermore, it is recommended that CMOS switches be incorporated to isolate the DDC IC from outside connections while the EDID Fault Management is being updated. This is to prevent corruption of the data by attempts to read the data while it is being changed.

1.3.9Firmware Update Function (same ISP function) The update firmware need through from the D-Sub connector, use DDC I2C bus to do update firmware.

1.4PANEL ELECTRICAL

1.4.1General Requirements

The panel used as the display device shall be an WUXGA resolution, 24W TFT-LCD. This panel shall be approved for use in this monitor.

1.4.2Panel Timings

The controller included with the monitor shall translate all video timings from the CPU that meet the timing requirements listed in Panel specification into timings appropriate for the panel. Under no circumstances may the controller supply the panel with timings that may result in damage. The controller shall insulate the panel from the CPU , so that the panel shall always be driven per it's own specification regardless of the timings being sent from the CPU.

1.4.3Polarizer Hardness

The outer face of the front polarizer panel shall be covered with a coating with a # 3 hardness value .

1.4.4Backlight Requirements

1.4.4.1General Requirements

The backlight assembly shall be designed to support field replacement at the customer site or authorized service center. The lamps shall have a continuous operating life of at least 40,000 hours at 25. The operating life is defined as having ended when the illumination of light has reached 50% of the initial value. The lamps shall extend a sufficient amount from the edge of the light guide that sputtering over the life of the lamps shall not cause degradation of the luminance uniformity (such as non-illuminated bands along the edges of the display).

1.4.4.2Lamps Startup Time

The backlight lamps shall start about 2 sec of the time the monitor power switch is pressed or the monitor is restarted from a power - down mode

.The starting time shall stay about 2 sec. for the

minimum expected life of the lamps. Test conditions are as follows : Ambient Light ----------------------

Temperature--------------------------

Inactive Time -----------------------

1.4.5Defects

1.4.5.1Visual Inspection

The LCD panel shall be inspected with all pixels set to white,black , red , green , and blue. The color variation, brightness variation , and overall appearance must not be perceived as poor quality by Lite-On . Areas and / or parameters considered questionable shall be subjected to detailed measurements .