Video Stretching; Panel Timing And Interface; Dc - Ac Inverter Requirements; Flat Panel - Acer A221HQV Service Manual

ACER A211H/A221HQ
6
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DVI digital signal to the panel. The controller will
include a PLL, A/D converters, TMDS receiver
and other circuitry necessary to perform its
function. The PLL shall be stable enough to
ensure a stable image.

1.3.5.2 Video Stretching:

The monitor shall have the function to "stretch"
the video signal, so that an input signal from the
computer in any resolution smaller than 1920 x
1080 is automatically expanded to fill the entire
screen.

1.3.5.3 Panel Timing and Interface:

The controller supplied with the monitor shall
control all panel timing. This controller shall
adequately insulate themonitor from the
computer, so that no possible combination of
input signals from the computer shall cause
damage to the flat panel or any other component
of the monitor.

1.3.6 DC - AC Inverter Requirements:

The frequencies used by the DC - AC inverter should be
carefully selected to prevent any noticeable effects on the
screen (such as a rolling effect). The Inverter
specification detail information in Table 2:
Inverter specification for M215HW01 V7
Item
Output Current
Output Voltage
Operation frequency
Striking Voltage
1.3.7 Power Supply Requirements:
The AC to DC power supply for this monitor shall be an
integrated power supply. This power supply shall have an
IEC receptacle for mains power input and provide
sufficient power for backlight assembly, interface board
and panel. And it should meet all requirements specified
in the following Table.
The operating range shall be from 90 to 264 VA sinusoidal for all
Input Voltage Range
models specified.
Input Frequency Range Input power frequency range shall be from 47 to 63Hz.
Power consumption for the monitor shall be less than 30W over
Power Consumption the specified voltage and frequency ranges. In power off mode the
power consumption will be less than 1W (at 90VAC~264VAC).
The AC input shall be fused and become electrically open as a
Line Fuse result on an unsafe current level. The fuse may 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 frequency,
operating temperature, and cold backlight lamps.
The inrush current must be limited to 35A when operated at
120VAC, and 80A when operated at 220VAC. In - rush current is
Inrush Current
measured at an ambient temperature of 25°C, with the unit
temperature stabilized in the power - off.
1. Product Specification (continued)
Min. Typ. Max.
3 7.5 8
¡¡ ¡¡
791
40 55 60
--- --- 1780
1.3.8 Display Communications Channel:
The monitor shall provide a display communications
channel that conforms to VESA DDC2B hardware
requirements. This configuration shall contain the
128-byte EDID file as specified by VESA E-EDID
Standard. Once the EDID is programmed the write
protection function will enabled. So the EEPROM
data cannot be overwritten.

1.4 Flat Panel:

1.4.1 General Requirements:
The panel shall be a Full HD resolution 21.5"
diagonal TFT-LCD.
1.4.2 Panel Timings:
The controller in the monitor shall translate video
timings from the PC to meet the timing requirements
Unit
listed in Panel specification. Under no circumstances
mArms
may the controller supply the panel with timings that
Vrms
may result in damage. The controller shall insulate
KHz
the panel from the PC, so that the panel shall always
Vrms
be driven according to its specification regardless of
the timings being sent from the PC.
1.4.3 Polarizer Hardness:
The outer face of the front polarizer panel shall be
covered with a coating with a 3H hardness value.
1.4.4 Backlight Requirements:
The backlight assembly shall be designed to support
field replacement at the customer site or authorized
service center. The backlight module shall have a
continuous operating life of at least 30,000 hours at
25°C. The operating life is defined as having ended
when the illumination of light has reached 50% of the
initial value. The backlight module shall extend a
sufficient amount from the edge of the light guide that
sputtering over the life of the
backlight shall not cause degradation of the
luminance uniformity (such as non-illuminated bands
along the edges of the display).
The power supply shall not be damaged when switched ON
for one second and OFF for one second for seven
Hot Start Cycle
consecutive times after operating for one hour at full load,
25°C, and nominal input line voltage.
The power supply shall contain protection circuitry such that
the application of an input voltage below the minimum
Under Voltage
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)
Line Transient and IEC 801 -5 (+/-2KV) for the domestic U.S. Version. The
UPS power supply shall operate and comply with CE mark.
DC Output 5.15+/-0.2V (1.85A); 22+/-2V (0.75A)