Acer AL1716 Service Manual - Page 8

Browse online or download pdf Service Manual for Monitor Acer AL1716. Acer AL1716 50 pages. 43.2cm(17”) tft color lcd monitor
Also for Acer AL1716: User Manual (17 pages), User Manual (10 pages), Service Manual (50 pages), Specifications (2 pages), Service Manual (47 pages), Service Manual (40 pages), Quick Start Manual (1 pages), User Manual (11 pages), User Manual (20 pages), Quick Start Manual (1 pages)

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2.1 General Information

HannStar, HSD170MGW1-A00 which display model

is a color active matrix thin film transistor (TFT) liquid

crystal display (LCD) that uses amorphous silicon TFT

as a switching device. This model is composed of a

TFT LCD panel, a driving circuit and a back light

system. This TFT LCD has a 17.0 inch diagonally

measured active display area with XGA resolution (900

vertical by 1440 horizontal pixel array) and can display

up to 262,144 colors.

2.2 Panel 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.

2,3 Polarizer Hardness:

The outer face of the front polarizer panel shall be

covered with a coating with a 3H hardness value.

2.4 Backlight Requirements:

2.4.1 General 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 30,000hrs at 25 degree C. 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).

2.4.2 Lamps Startup Time: The backlight lamps shal

start within 3sec. of the time the monitor power

switch is pressed or the monitor is restarted from

a power - down mode .The starting time shall stay

below 3 sec. for the minimum expected life of the

lamps. Test conditions are as follows:

Ambient Light ----------------------< 1.0 lux.

Temperature------------------------10degreeC

Inactive Time -----------------------> 24 hours

2. Flat Panel Specification

2.5 Defects:

.5.1 Visual 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.

.5.2 Display Degradation: Over the life of the product,

variation of the parameters specified in panel

specification shall be maintained within

reasonable limits. The panel must not exhibit any

significant defects while in operation (excluding

the CCFL operation). This does not in any way c

change the warranty given by the panel vender.

.5.3 Light Leakage: Except for the active display area,

there shall be no light emission visible from any

angle from any other part of the display. For this

test, the ambient illumination will follow the panel

specification 300 to 700 lux.

.5.4 Allowable Defects: No cosmetic defects are

allowed except those specified below. The

conditions of visual inspections are as follows:

- Viewing distance is to be approximately 35~50

cm.

- Ambient illumination is to be 300 to 700 lux.

- Viewing angle range shall be 160 degrees

Horizontal and 160 degrees vertical typically.

- Defects not apparent within one minute shall be

ignored.

2.5.5 Defect Terminology: Table 3 gives the descriptive

terms used in classifying defects.

Spots or lines that appear dark in the display patterns and are usually the

result of contamination. Defects do not vary in size or intensity (contrast)

Dark Spots/Lines

when contrast voltage is varied. Contrast variation can be achieved

through the use of varying gray shade patterns.

Spots or lines that appear light in the display patterns. Defects do not vary in

Bright Spots/Lines

size or intensity (contrast) when contrast voltage is varied. Contrast variation

can be achieved through the use of varying gray shade patterns.

When the unit lights, lines appear light (white) with display patterns dark and

Polarizer Scratch

do not vary in size. Physical damage to the polarizer does not damage the

glass.

When the unit lights, spots appear light (white) with display patterns dark

Polarizer Dent

and do not vary in size. Physical damage to the polarizer that does not

damage the glass.

Horizontal or diagonal lines that appear gray with the display patterns dark

Rubbing Line

and may have resulted from an 'out of control' rubbing process on the

polyimide or 'waves'" on the BEFs or prism sheets .

Newton Ring

The 'rainbow' effect caused by non-uniform cell thickness.

When the unit lights, variation / non – uniformity (splotchiness) appears light

Mottling

(white) with the display and might vary in size.

When the unit lights, line(s) in the minor (vertical) or major (horizontal) axis

Dim Line

appear dim, but not completely on or off.

Cross Lines Off

When the unit lights , lines in both the minor and major axis do not appear.

Bright/Dark Dot

A sub - pixel (R, G, B dot) stuck off / on (electrical).

ACER AL1716W

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