Acer AL2017 Manuel d'entretien - Page 18

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1. Black Screen

Acer

Standby (No H/V

Power off

3.6 VGA Cable Detect Test

If VGA cable of LCD monitor isn't connected to video pattern generator or PC, "NO SIGNAL" should

be shown on screen.

3.7 Hi-Pot test

Test condition:

a. high voltage

b. leakage current

c. rising time

d. test time

3.8 Grounding Test

Test condition:

a. test current

b. impedance

3.9 Bumping Test

3.9.1 Test mode: 1400x1050 @ 60 Hz;

3.9.2 Test pattern: pattern #1 of crosshatch (GENERAL-1)

3.9.3 To shock LCD monitor lightly at the center of rear cover and edges with 1~2kg/cm2 force for

three times, no abnormal phenomenon is found on panel screen.

4. DISPLAY CHECK

4.1 Panel Flicker Check

Connect LCD monitor to PC, set LCD monitor to be timing of 14400x1050@60 Hz, adjust brightness to

be default value (brightness at maximum), execute "Auto" function, and then check picture of shut

down under windows 98 operating system, or flicker-pattern of pixel on-off. It should be that no flicker

be found on panel screen.

4.2 Panel Defect Inspection

4.2.1 Test mode: 1400 x 1050@60Hz

4.2.2 Test pattern: Crosshatch/Full white/Red/Green/Blue/Black/16 color bar/64 gray bars

4.2.3 Display quality must be (according to DIN 13406-2 pixel fault class II)

Bright dot defect

Dark dot defect

Total bright and dark dots

Bright Dots – 2 Adjacent B

Bright Dots – 3 or more Adjacent

Black Dots – 2 Adjacent B

Black Dots – 3 or more Adjacent

Distance between defect dots

Distance between Dark dots

Note 1: Dot defect is defined as the defective area is not larger than 50% of the dot area. Bright Dot is

Status

Power Consumption

Normal

< 42W(with audio)

sync)

2.3KV(DC)

10mA

1 sec.

3 sec.

30A / 2 sec

< 0.1Ω

Defect Type

LED Display

< 1W

No display

Specification

THD

Service Manual

Green

Orange

Major

Minor

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