Hyundai hlcd a27w4 schematic
27” LCD TV Hyundai HLCD-A27W4
Service
Service
Service
TABLE OF CONTENTS
Description Page Description Page
Table Of Contents.......……..............................…........1
Revision List.…........................................……......2
Important Safety Notice.……..................……......3
1.General Specifications..............................………........4
2.Operating Instructions………..…………………….......6
2.1.The Use of Remote Control…................……...........6
2.2.To Use the Menu………..............................…...........7
2.3.LCD TV Description…….…..............……...............14
2.4.Interface Connector……............................…...........14
3.Precautions and Notices…............……………............15
3.1.Assembly Precaution…............………….................15
3.2.Operating Precaution…………...........................15
3.3.Storage Precaution…......………………..................15
3.4.High Voltage Warning.…..........…………................15
4.Input/Output Description……..…………… ...........16
4.1.D-SUB Connector……...…………………....….......16
4.2.Factory Preset Display Modes……………..….......17
5.Front Panel Control Knobs…....................................17
6.Repair Flow Chart…….............................................18
7.Mechanical Instructions……………................24
8.PCB Layout..………….......................................28
8.1.Main Board……….....…….................................28
8.2.Power Board…...………...................................31
8.3.DC-DC Board…………........................................34
8.4.IR Board……………….......................................34
8.5.Key Board………………......................................35
8.6.Headphone Board………..................................35
9.Block Diagram………………..............................36
10.Schematic Diagram………………...............…37
10.1.Main Board.............................................37
10.2.Power Board....……....................................51
11.Exploded View………..….......................................53
12.BOM List………………………………….............54
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE
CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING
ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGE
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
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27” LCD TV Hyundai HLCD-A27W4
Revision List
Revision Date Revision History TPV Model
A00 Oct-10-06 First Version Release E276MSNSD2H4NP
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27” LCD TV Hyundai HLCD-A27W4
Important Safety Notice
Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service
procedures recommended by AOC and described in this service manual are effective methods of performing service
operations. Some of these service operations require the use of tools specially designed for the purpose. The
special tools should be used when and as recommended.
It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully read in
order to minimize the risk of personal injury to service personnel. The possibility exists that improper service
methods may damage the equipment. It is also important to understand that these CAUTIONS and NOTICES ARE
NOT EXHAUSTIVE. AOC could not possibly know, evaluate and advise the service trade of all conceivable ways in
which service might be done or of the possible hazardous consequences of each way. Consequently, AOC has not
undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not
recommended by AOC must first satisfy himself thoroughly that neither his safety nor the safe operation of the
equipment will be jeopardized by the service method selected.
Hereafter throughout this manual, AOC Company will be referred to as AOC.
WARNING
Use of substitute replacement parts, which do not have the same, specified safety characteristics may create shock,
fire, or other hazards.
Under no circumstances should the original design be modified or altered without written permission from AOC.
AOC assumes no liability, express or implied, arising out of any unauthorized modification of design.
Servicer assumes all liability.
FOR PRODUCTS CONTAINING LASER:
DANGER-Invisible laser radiation when open AVOID DIRECT EXPOSURE TO BEAM.
CAUTION-Use of controls or adjustments or performance of procedures other than those specified herein may
result in hazardous radiation exposure.
CAUTION -The use of optical instruments with this product will increase eye hazard.
TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY ORIGINAL MANUFACTURER'S
REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART NUMBERS IN THE PARTS LIST SECTION OF
THIS SERVICE MANUAL.
Take care during handling the LCD module with backlight unit
-Must mount the module using mounting holes arranged in four corners.
-Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen.
-Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to
the panel.
-Protect the module from the ESD as it may damage the electronic circuit (C-MOS).
-Make certain that treatment person’s body is grounded through wristband.
-Do not leave the module in high temperature and in areas of high humidity for a long time.
-Avoid contact with water as it may a short circuit within the module.
-If the surface of panel becomes dirty, please wipe it off with a soft material. (Cleaning with a dirty or rough cloth may
damage the panel.)
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27” LCD TV Hyundai HLCD-A27W4
1. General Specifications
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27” LCD TV Hyundai HLCD-A27W4
2. Operating Instructions
2.1. The Use Of Remote Control
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27” LCD TV Hyundai HLCD-A27W4
2.2 To Use The Menus
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27” LCD TV Hyundai HLCD-A27W4
2.3 LCD TV Description
The LCD TV will contain a main board, a power board, an IR board, a key board, a DC to DC board and a
headphone Board. The main board and power board will house the flat panel to control logic I²C bus, DDC,
brightness control logic for LCD panel, DC-DC conversion to supply the appropriate power to the whole board
and transmitting TTL level signals into LCD Module to drive the LCD display circuit.
The inverter board will drive the five CCFLs (Cold Cathode Fluorescent Tube).
The switching power board will provides the power ON/OFF to control the TV and control LED indicator for
DPMS.
The function keyboard and Remote Control will provide the OSD control signal to the Main Board.
2.4 Interface Connector
(A) Power Cord Connector.
(B) RF Signal Connector.
(C) Video / Audio Signal Connectors.
(D) PC D-sub 15 pin Connector.
(E) PC Audio Connector
(F) AV Connector
(G) S-Video Connector
(H) Component Connector
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27” LCD TV Hyundai HLCD-A27W4
3. Precautions and Notices
3.1 Assembly Precaution
(1) Please do not press or scratch LCD panel surface with anything hard. And do not soil LCD panel surface
by touching with bare hands (Polarize film, surface of LCD panel is easy to be flawed)
In the LCD panel, the gap between two glass plates is kept perfectly even to maintain display
characteristic and reliability. If this panel is subject to hard pressing, the following occurs:
(a) Uniform color (b) Orientation of liquid crystal becomes disorder
(2) Please wipe out LCD panel surface with absorbent cotton or soft cloth in case of it being soiled.
(3) Please wipe out drops of adhesive like saliva and water in LCD panel surface immediately.
They might damage to cause panel surface variation and color change.
(4) Do not apply any strong mechanical shock to the LCD panel.
3.2 Operating Precaution
(1) Please be sure to unplug the power cord before remove the back-cover. (Be sure the power button is
turn-off)
(2) Please do not change variable resistance settings in MAIN-BOARD; they are adjusted to the most
suitable value. If they are changed, it might happen LUMINANCE does not satisfy the white balance
spec.
(3) Please consider that LCD backlight takes longer time to become stable of radiation characteristic in low
temperature than in room temperature.
(4) Please pay attention to displaying the same pattern for very long-time. Image might stick on LCD.
3.3 Storage Precaution
(1) When you store LCD for a long time, it is recommended to keep the temperature between -10°C -50°C
without the exposure of sunlight and to keep the humidity less than 85% RH.
(2) Please do not leave the LCD in the environment of high humidity and high temperature such as 60°C,
85%RH.
(3) Please do not leave the LCD in the environment of low temperature: below -10°C.
3.4 High Voltage Warning
The high voltage was only generated by INVERTER module on Power Board, if carelessly contacted the
transformer on this module, can cause a serious shock. (The lamp voltage after stable around 600V, with
lamp current around 8mA, and the lamp starting voltage was around 1500V, at Ta=25°C)
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27” LCD TV Hyundai HLCD-A27W4
4. Input/Output Description
4.1 D-SUB Connector
This procedure gives you instructions for installing and using the LCD TV display.
1. Position the display on the desired operation and plug the power cord into a convenient AC outlet.
Three-wire power cord must be shielded and is provided as a safety precaution as it connects the chassis
and cabinet to the electrical conduct ground. If the AC outlet in your location does not have provisions for
the grounded type plug, the installer should attach the proper adapter to ensure a safe ground potential.
2. Connect the 15-pin color display shielded signal cable to your signal system device and lock both screws
on the connector to ensure firm grounding. The connector information is as follow:
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6
11 15
5
10
15 - Pin Color Display Signal Cable
Pin No. Description Pin No. Description
1 Red Video 9 + 5V
2 Green Video 10 Sync Ground
3 Blue Video 11 Ground
4 Ground 12 Serial Data for DDC
5 Ground 13 H-Sync.
6 Red Ground 14 V-Sync.
7 Green Ground 15 Serial Clock for DDC
8 Blue Ground
3. Apply power to the display by turning the power switch to the "ON" position and allow about ten seconds
for Panel warm-up. The Power-On indicator lights "GREEN" when the display is on.
4. With proper signals feed to the display, a pattern or data should appear on the screen, adjust the
brightness and contrast to the most pleasing display, or press auto-adjust to get the best picture-quality.
5. This TV (with PC function) has power saving function following the VESA DPMS. Be sure to connect the
signal cable to the PC.
6. If your TV requires service, it must be returned with the power cord.
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27” LCD TV Hyundai HLCD-A27W4
4.2 Factory Preset Display Modes:
Analog RGB Signal Timing
MODE ASPECT RATIO HANDLING COMPATIBLE INPUTS
STANDARD RESOLUTION FS*Full-Screen AR Aspect Ratio 1:1 Comp SVHS YPBPR YCBCR RGB
720x400 @ 70Hz 1280 x 768 1024 x 768 N/A No No No No Yes
640x480 @ 60Hz 1280 x 768 1024 x 768 N/A No No No No Yes
640x480 @ 72Hz 1280 x 768 1024 x 768 N/A No No No No Yes
640x480 @ 75Hz 1280 x 768 1024 x 768 N/A No No No No Yes
VESA 800x600 @ 60Hz 1280 x 768 1024 x 768 N/A No No No No Yes
VESA 800x600 @ 72Hz 1280 x 768 1024 x 768 N/A No No No No Yes
VESA 800x600 @ 75Hz 1280 x 768 1024 x 768 N/A No No No No Yes
VESA 1024x768 @ 60Hz 1280 x 768 1024 x 768 1024 x 768 No No No No Yes
VESA 1280x768@60HZ 1280 x 768 1024 x 768 N/A NO NO No No Yes
NTSC 480i 1280 x 768 1024 x 768* N/A Yes Yes
DVD 480p 1280 x 768 1024 x 768* N/A No No Yes No Yes
720p 1280 x 768 1024 x 768* 16:9 (YpbPr/DVI) No No Yes No Yes
Yes
Yes
No
5. Front Panel Control Knobs
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27” LCD TV Hyundai HLCD-A27W4
6. Repair Flow Chart
1. No Power (No LED indicator)
Check power cord and board interface
OK
Check F901, BD901, D901, D902
OK
Check IC981, D928 (12V)
Check the load
NG
NG
NG
Replace F901 or BD901 or D910 or D902
Replace IC981or D928
Plug in power cord and interface
OK
Check Q924, IC924 (ON/OFF signal)
OK
Check IC941, Q941
OK
Check T951
NG
NG
NG
Replace IC941, Q941
Replace T951
Replace Q924 or IC924
OK
Check IC901, Q901
NG
Replace IC901 or Q901
OK
Check Q942, Q943
OK
Check IC927
NG
NG
Replace IC927
Replace Q942 or Q943
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27” LCD TV Hyundai HLCD-A27W4
2. Can not start (LED indicator yellow)
Check keyboard
OK
NG
Repair the keyboard
Check 5V_SB
NG
Return to “5.1”
Check PWR_ON signal
OK
Check 3.3V_SB
OK
OK
NG
NG
Replace U700
Check Q700, Q701, Q702, Q703
Check U300,U501
Check I2C communication
Check Panel inverter board
NG
NG
Replace U300,U501
NG
Replace Q700 or Q701 or
Q702 or Q703
Replace panel
Check PFC circuit
NG
Replace IC901 or Q901
OK
Check main board
power supply
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27” LCD TV Hyundai HLCD-A27W4
3. No display (LED indicator green)
Check the source
OK
Check LVDS cable
OK
Check 24V power supply
OK
NG
NG
Reset source
Reset LVDS cable
NG
Return to “5.1”
Check main board power supply
OK
Check U300
OK
NG
Replace U300
Check I2C communication
OK
Check panel
NG
Replace panel
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27” LCD TV Hyundai HLCD-A27W4
4. Abnormal Display
Check the source
OK
Check signal filter circuit
NG
NG
Reset source
Replace the filter or inductance
RF signal Check TV system setup
OK
OK
Check Tuner
NG
Replace Tuner
AV1, AV2 signal
OK
Check U102
NG
Replace U102
PC signal and
COMP_YPbPr
Check U103
NG
Replace U103
OK
Check U200, U300
NG
Replace U200, U300
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27” LCD TV Hyundai HLCD-A27W4
5. No sound
Check the source
NG
Reset source
Check signal filter circuit
OK
NG
Replace the filter or inductance
Check Earphone jack
OK
NG
SIF signal Check TV system setup
Replace the Earphone jack
OK
Check Tuner
NG
Replace Tuner
AV, Component, DVD signal
Check U100
Check Audio decoder MSP3425G U601
OK
Check U600, U603
NG
NG
Replace U601
Replace U600 or U603
Check Amplifier TDA7266D U602
OK
OK
NG
Replace U602
Check speaker
NG
Replace speaker
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27” LCD TV Hyundai HLCD-A27W4
6. Key Board
OSD is unstable or not working
Is Key Pad Board connecting normally?
N
Connect Key Pad Board
Y
Is Button Switch normally?
N
Replace Button Switch
Y
Is Key Pad Board Normally?
N
Replace Key Pad Board
Y
Check Main Board
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27” LCD TV Hyundai HLCD-A27W4
7. Mechanical Instructions
Step Figure Description
Lay the LCD-TV
Preparation
on a flat, soft
and clean
surface.
Remove the
base and
stand
Remove the
back cover
Remove the
hinge cover and
the screws on
the stand to
remove the
base and stand
Remove the ten
screws mark in
red to remove
the back cover.
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27” LCD TV Hyundai HLCD-A27W4
Remove the
BKT-Connector
Remove the
shield
1.Remove the
six screws
2. Push the
shield as the
arrowhead
direction.
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