Giáo trình sửa chữa màn hình LCD - Chương2

LCD Monitor Service Guide
for
L2 (Module) Repair







Model: MB19TU/SE


V1.0

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



2
Release Version List
Version Issue Date Remarks

v1.0 2006.09.05 First Release



3
Index

I. MB19TU/SE LCD Monitor Overview.........................................................1
II. Product Specification ................................................................................2
III. MMI...........................................................................................................3
Front side..................................................................................................3
Back side..................................................................................................5
IV. Menu & Operating Mode...........................................................................6
V. Disassembly & Assembly..........................................................................7
1. Precaution .........................................................................................7
2. Suggest Tools....................................................................................8
3. Disassembly Procedure.....................................................................9
3.1 Stand Subsystem.......................................................................10
3.2 Board Subsystem ......................................................................11
3.3 Panel Subsystem.......................................................................20
3.4 Bezel Subsystem.......................................................................22
4. Assemble Procedure .......................................................................23
4.1 Bezel Subsystem.......................................................................24
4.2 Panel Subsystem.......................................................................25
4.3 Board Subsystem.......................................................................27
4.4 Stand Subsystem .......................................................................35
VI. HW Block Diagram .................................................................................36

I. MB19TU/SE LCD Monitor Overview
Main product features include

z 19“ LCD Monitor
z Recommended Resolution: 1280*1024
z MB19TU:2 ms (Gray to Gray) Rapid response time
MB19SE:5 ms (Tr+Tf) Quick response time
z SPLENDID™ Video Enhancement Technology by hotkey
z 3 Skin-tones selection
z Built-in Stereo Powerful Speakers
z 5 Video Preset Mode Selections via a Hotkey
z VGA input and DVI-D inputs (MB19TU only)
z VESA Display Data Channel DDC2B compliance
z VESA wall mount compliance


MB19TU MB19SE












2
II. Product Specification
Technical Specification MB19TU MB19SE
Panel Size

19" TFT
Response Time
2ms (Gray to Gray) 5ms (Tr+Tf)
Brightness (Max.)
320cd/m2 300cd/m2
Contrast Ratio (Max.)
800:1 700:1
Viewing Angle (H/V)
160/160
Max. Resolution
SXGA 1280X1240
Pixel Pitch
0.294mm
Panel
Display Color
16.2M
Splendid (Video Intelligence)
Yes
Digital
24-Pin DVI-D NO
Analog
15-Pin D-Sub
Inputs
Audio-in
3.5mm mini jack
Headphone
3.5mm mini jack
Output
Speaker
2W x 2 Stereo

Tile
+20~ -5
Wall Mounting (VESA)
Yes(100mm)
ME
Color
Black +Silver Iron-gray/Silver
Security Kensington lock
Yes
Power Supply
AC: 100~240V
Power on mode
<48W
Power
Standy by mode
<2W
Net (WxHxD)
413x407x224mm
Dimension
Packing (WxHxD)
500x458x138mm
Net
5.2kg
Weight
Gross
6.7kg
Accessory
DVI cable, D-sub
cable, Audio cable,
Power cord, Quick

Start Guide, Support
CD
D-sub cable, Audio
cable, Power cord,
Quick Start Guide,
Support CD
Regulation Approval
Energy Star 2006,
UL/cUL, CB, CE,
FCC, CCC, BSMI,
Gost-R, C-Tick, PSB,
MIC, WHQL
TC003, Energy Star
2006, UL/cUL, CB,
CE, FFC, CCC,
BSMI, Gost-R,
C-Tick, PSB, MIC,
WHQL




3
III. MMI
Front side


1. Headphone port . This is port connects a headphone with a stereo
mini-plug (3.5 mm)
2. “S” Button:

z Use this hotkey to switch from five video preset modes (Standard Mode,
Theater Mode, Game Mode, Night View Mode, and Scenery Mode) with
SPLENDID
TM
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 2-4 seconds.
3. “–” Button:
z Press this button to decrease the value of the function selected or move
to the previous function.
z This is also a hotkey for Volume adjustment.
4. “
+
” Button

z Press this button to increase the value of the function selected or move
to the next function.
z This is also a hotkey for Brightness adjustment.
5.
MENU
Button
z Press this button to enter/select the icon (function) highlighted while
the OSD menu is activated.

4

6. Sensor
z Press this sensor to turn the monitor on/off
z The table below shows the status of the LED indicator beside this
button.

LED Status Description
Blue Power ON
Amber Standby mode
OFF Power OFF



5
Back side

1. AC-in Port. This port connects the power connector by the bundled power
cord.
2. DVI port. (MB19TU only) This is 24-pin port is for PC DVI-D digital signal
connection
3. VGA port. This 15-pin port is for PC VGA connection.
4. Audio-in port. This port connects PC audio source by the bundled audio
cable.




6
IV. Menu & Operating Mode

Menu
Splendid Image Color
(1) Scenery Mode
(2) Standard Mode
(3) Theater Mode
(4) Game Mode
(5) Night Mode

(1) Brightness
(2) Contrast

(1) Color Temp
(2) Skin Tone
(3) RGB
Input Select System Setup

(1) <VGA>
(2) <DVI> (MB19TU only)
(1) OSD Setup
(2) Image Setup
(3) input select (MB19TU only)
(4) Information
(5) Language
(6) Reset


Supported Operating Mode

Standard

Resolution Horizontal
Frequency
Vertical
Frequency
Pixel Frequency
DOS
720×400 31.47KHz 70Hz 28.32MHz
640×480 31.47KHz 60Hz 25.18MHz
640×480 37.90KHz 72Hz 31.50MHz
VGA
640×480 37.50KHz 75Hz 31.50MHz
800×600 35.16KHz 56Hz 36.00MHz
800×600 37.90KHz 60Hz 40.00MHz
800×600 48.10KHz 72Hz 50.00MHz
SVGA
800×600 46.90KHz 75Hz 49.50MHz
1024×768 48.40KHz 60Hz 65.00MHz
1024×768 56.50KHz 70Hz 75.00MHz
XGA
1024×768 60.02KHz 75Hz 78.75MHz
1280×1024 64.00KHz 60Hz 108.00MHz
SXGA
1280×1024 78.00KHz 75Hz 135.00MHz

＊
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.

7
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.




8
2. Suggest Tools
Here are some tools that can be used for the LCD monitor’s service and repair.

Philips-head Screwdriver
Use a Philips-head screwdriver to fasten/remove the K- or B-typed screws

P/N：N/A

Gloves

To protect LCD Panel and your hand

P/N: (L) 16-003300131 (M) 16-003300130

C/D Disassembly Tool

Use C/D Disassembly Tool to open cosmetic cover and avoid scratch.

P/N: 13GV0400PZZZZ

Spacer Screwdriver
Use a spacer screwdriver to fasten/remove spacer screws or hex screws.


P/N: N/A



9
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 MB19TU/SE 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 Panel Subsystem
3.4 Bezel Subsystem



10
3.1 Stand Subsystem

1. Unlock four clips to dismount BASE.

11
3.2 Board Subsystem

Back Cover
1. Push up to dismount CABLE COVER.

2. Release 4 screws on the STAND.



3. Pull down to dismount STAND.




12
4. Remove 4 screws on the HINGE.

.
5. Remove 4 screws on BACK COVER.



6. Lift BACK COVER from under part to dismount.





13

Key Board
1. Release 6 screws on KEY BOARD.




2. Lay the KEY BOARD down over the Panel Frame.