Giáo trình sửa chữa màn hình LCD - Chương5

Giáo trình sửa chữa màn hình LCD - Chương

LCD Monitor Service Guide

RESTRICTIONS ON USE OF MATERIALS

This manual is only for ASUS authorized service centers to repair ASUS LCD product The documents are provided as is and no copy, reproduction

or transfer shall be made without first acquiring prior written approval from ASUSTEK All rights reserved

Release Version List

Index

I PG191 LCD Monitor Overview 4

II Product Specification 5

III MMI 6

1 Front side 6

2 Back side 8

3 Side view 9

IV Menu & Operating Mode 10

V Disassembly & Assembly 11

1 Precaution 11

2 Suggest Tools 12

3 Disassembly Procedure 13

3.1 Stand Subsystem 14

3.2 Board Subsystem 19

3.3 Bezel Subsystem 28

3.4 Panel Subsystem 30

4 Assemble Procedure 32

4.1 Panel Subsystem 33

4.2 Bezel Subsystem 35

4.3 Board Subsystem 37

4.4 Stand Subsystem 46

VI. HW Block Diagram 51

I PG191 LCD Monitor Overview

The LCD monitor features high-quality audio technology, including a

detachable 15W ASUS Power Bass System and the most advanced SRS TruSurround XTnd sound effect which help provide vivid melody, enhancing your audio enjoyment while you watch movies, play games, or listen to music! The build-in 1.3 megapixel webcam on top of the LCD panel has both video recording and snapshot functions, allowing you to capture images, create videos, of hold a video conference! Besides, a host of user-friendly functions such as the rotating swivel, adjustable tilt, and smart touch sensor buttons facilitate the usage of the monitor, upgrading your work efficiency

Main Features include:

z 19’’ TFT LCD Monitor

z True resolution:1280x1024(SXGA)

z 2ms(gray to gray) quick response time

z 5Wx2 stereo speakers

z 1.5W Power Bass System

z SRS TruSurround XTnd sound effect

z 3 USB 2.0 ports

z Built-in 1.3 megapixel webcam

z 5 SPLENDIDTM Video preset modes switched by hotkey

z 3 skin-tone selections

z 5 sound preset modes switched by hotkey

z Touch sensor controls

z Both VGA and DVI-D inputs

z Headphone output & Microphone input

z VESA Display Data Channel DDC2B compliance

z VESA wall mount compliance(100x100)

II Product Specification

Splendid (Video Intelligence) Yes

PC Audio Line-in 3.5mm Mini-jack

Color Shining Black +Silver

Security Kensington lock Yes

Power Cord, 4-in-1 cable, DVI cable

Regulation Approval

Energy Star, UL/cUL, CB, CE, FCC, CCC, BSMI, Gost-R, C-Tick, VCCI, RoHS, MIC, WEEE

III MMI

1 Front side

1 ♫ Sensor

z Use this hotkey to switch to any of the five sound preset

modes( Standard Mode, Fighting Game Mode, Strategic Game Mode, Theater Mode, Music Mode)

2 MENU Sensor

z Touch this sensor to active the OSD (on-Screen Display) main menu

z Touch this sensor to enter/select the item (function) highlighted while

the OSD menu is activated

3 +/▲ Sensor

z Touch this sensor to increase the value of the function selected or move

to the next function

z This is also a hotkey for Brightness adjustment

z Use this hotkey to switch to any of the five video preset modes

(Standard Mode, Theater Mode, Game Mode, Night View Mode, Scenery Mode) with SPLENDIDTM Video Intelligence Technology

z Exit the OSD menu or go back to the previous menu as the OSD menu

is active

z Automatically adjust the image to its optimized position, clock, and phase by touching the sensor for 2-3 seconds

6 Sensor

z Touch this sensor to turn the monitor on/off

LED Status Description

3 Side view

1 SRS On/Off button Press this button to turn on/off the SRS sound effect

2 USB 2.0 ports These three Universal Series Bus (USB) port are available

for connecting USB 2.0 devices

3 Microphone port This port connects a microphone with a mini-plug

(3.5mm)

4 Headphone port This port connects a headphone with a stereo mini-plug

(3.5mm)

IV Menu & Operating Mode

(1) Color Temp (2)Skin Tone

(1) VGA

(2) DVI

(1) OSD Setup (2) Language (3) Information (4) Reset

(1) Preset Mode (2) SRS TSXT (3) True Bass (4) Balance (5) Equalizer (6) Melody

Supported Operating Mode

Standard Resolution Horizontal

Frequency

Vertical Frequency

Pixel Frequency

Modes not listed in the table may not be supported For optimal resolution,

we recommend that you choose a mode listed in the table above

V Disassembly & Assembly

1 Precaution

Please read the precautions as follows to prevent any damages to the LCD monitor and also select the appropriate tools for disassembly and re-assembly

‹ Make sure all power connection is removed Be sure that the LCD monitor

is in power off status

‹ Prepare soft cloth and sponge as working platform to place LCD monitor horizontally

‹ Hold LCD by the side carefully and DON’T touch or press panel directly

‹ Remove all rings, watches and any other metal objects from your hands which possible to cause scratch

‹ Always wear a ground strap or anti-static glove to protect the parts from static discharge ESD (electro-static discharge) protection is required to guarantee the safety of product and personnel

3 Disassembly Procedure

Information in this section is to perform the disassembly procedure of the LCD monitor Depending on the failures, replace the defective parts accordingly

Asus PG191 LCD Monitor consists of various subsystems This section

describes the procedures for LCD monitor disassembly In addition, the

detailed disassembly procedures of individual subsystem will be provided for your service needs

The disassembly procedure consists of the following steps:

3.1 Stand Subsystem

3.2 Board Subsystem

3.3 Bezel Subsystem

3.3 Panel Subsystem

3.1 Stand Subsystem

1 Disconnect SUBWOOFER CABLE

2 Remove 1 screw rubber on SUBWOOFER FIX RING

3 Remove 1 screw on SUBWOOFER FIX RING to dismount

4 Remove PROTECT WIRE RING

5 Pull out the left side SUBWOOFER SIDE COVER

9 Pull out SPEAKER WOOFER and SUBWOOFER CABLE

10 Remove 4 screw rubbers on BACK COVER

11 Remove 4 screws on the BACK COVER

12 Pull up to dismount VESA COVER

16 Remove 4 screws on BASE TOP COVER

4 Lift and remove BACK COVER

Main Board Shielding

1 Remove 2 pieces of TAPE on MAIN SHIELDING

4 Pull down MIAN SHIELDING, and then open it, but do not remove it

5 Unplug KEY BOARD CABLE, and then take it out of MAIN SHIELDING

2 Disconnect Power CABLE

5 Release 2 screws on HEAT SINK FIX MENTAL

9 Dismount MAIN BOARD

3 Remove POWER BOARD

4 Unplug USB CABLES, CAMERA CABLE and SPEAKER CABLE

2 Release 2 screws on SWITCH PLATE

3.4 Panel Subsystem

1 Remove 6 screws

2 Open 9 latches along the edges of LCD BEZEL to dismount LCD PANEL

3 Remove 4 screws on both sides

The assembly procedure consists of the following steps:

4.1 Panel Subsystem

1 Insert LVDS cable carefully

2 Paste 3 pieces of TAPE

3 Assemble LCD panel and LCD SHIELDING

4 Tighten 4 screws on both sides

2 Secure 4 screws on MAIN BOARD

6 Plug USB CABLES and SWITCH BOARD CABLE

7 Plug LVDS CABLE, and Cover LVDS CABLE COVER

8 Plug Power Cable

9 Paste 3 pieces of TAPE

4 Tighten 7 screws on MAIN SHIELDING

3 Mount 2 screw rubbers on BACK COVER

4.4 Stand Subsystem

1 Locate STAND on BASE PLATE

2 Tighten 4 screws on BASE TOP COVER

4 Mount BASE SWIVAL, and tighten 1 screw

7 Paste 4 screw rubbers

11 Completely insert SPEAKER WOOFER into SUBWOOFER FIX RING, meanwhile arrange SUBWOOFER CABLE

15 Place 1 screw rubber on screw

16 Connect SUBWOOFER CABLE

VI HW Block Diagram

Complete TFT LCD Display Unit

Micro Controller

Panel Timing Controller

DVI Receiver OSD LVDS

LVDS Panel

Power Inverter Board

Audio Amp