Haier LT42A1 User manual

42″LCDTV HaierLT42A1
1
Service
Service
Service
Table of Contents
Description Page Description Page
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 VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
6.2 Power Board…..…………..…………..…..…….......33
6.3 Key Board………………………..……...……….......37
6.4 IR Board…………………………..….…….…….......37
7.Adjustment................................................................38
8.Block Diagram.……..................................................39
9.Wiring Diagram.…….................................................40
10.Schematic Diagram……..……..……….……….......41
10.1 Main Board………….…………………....…..........41
10.2 Power Board………..…..…………...……….........55
10.3 Key Board…………….………….……………........61
10.4 IR Board………..………………….……….............62
10.Exploded View…………………….………….….......63
11.BOM List……………….…………….……………......65
Table of Contents........……...................................…........1
Important Safety Notice.......................................……......2
Revision List………………………………………………....3
1. General Specifications...............................………........4
2. Operating Instructions…………………….……...….......6
2.1 The Use of Remote Control…….…………...…….......6
2.2 To Use the Menus...……………………….……….......7
2.3 How to Connect……..…………………….………......16
2.4 Front Panel Control Knobs……………….………......17
3.Input/Output Specification…………....................……..18
4.Mechanical Instructions……………………..................22
5.Repair Flow Chart ……………………….…….……......25
6.PCB Layout ………………..………………....…...........31
6.1 Main Board………………..……………......…..…......31

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Important Safety Notice
Proper service and repair is important to the safe, reliable operation of all Haier Company Equipment. The service
procedures recommended by Haier 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. Haier 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, Haier has not
undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not
recommended by Haier 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, Haier Company will be referred to as Haier.
WARNING
Use of substitute replacement parts, which do not have the same, specified safety characteristics might create
shock, fire, or other hazards.
Under no circumstances should the original design be modified or altered without written permission from Haier.
Haier 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 radiations 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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Revision List
Version Release Date Revision Instructions Model Name
A00 Feb.26,2009 Initial Release E42AM2NB3WH72N

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1. General Specifications
* This model complies with the specifications listed below.
* Designs and specifications are subject to change without notice.
* These models may not be compatible with features and/or specifications that may be added in the future.
Model No. LT19A1 LT22A1 LT26A1 LT32A1 LT42A1
DISPLAY
Viewable 18.5” 22” 26” 32” 42”
Television
System PAL, SECAM standard, DVB-T standard
CONNECTIONS
Rear
Connectors
Tuner input (75Ω) PC IN: D-SUB and PC Audio (Headphone mini-jack)
Recommended:1360x768/60Hz
Component Video and L/R Audio input
Supported resolution: 480i, 576i/p, 720p, 1080i, 1080p(42" only)
HDMI input
Supported scan rates: 480p, 480i, 576p, 576i, 720p, 1080i, 1080p(42" only)
SCART 1
SPDIF
HDMI 1
SCART 1
SPDIF
HDMI 1
SCART 1
SCART 2
SPDIF
HDMI 1
HDMI 2
SCART 1
SCART 2
SPDIF
HDMI 1
HDMI 2
SCART 1
SCART 2
SPDIF
HDMI 1
HDMI 2
HDMI 3
SCART 1: RGB + CVBS in/out + audio in/out
SCART 2: S-Video + CVBS in/out + audio in/out
Side
Connectors
COMMON INTERFACE
AV In (Composite Audio/ Video)
Earphone Output
WEIGHT & DIMENSIOIN
Dimensions
with Stand (W
x H x D)
455x145x388 528x382x175.8 657.2x489.3x219.0 789.5x569.1x239.5 1015.4x703.0x280.5
mm mm mm mm mm
Weight with
Stand 3.7kg 4.8kg 8.0kg 11.1kg 20.5kg
Weight without
Stand and
Base
3.45kg 4.55kg 6.8kg 9.3kg 17.6kg
WALL MOUNTING
VESA-compatible wall
bracket (W x H) 100x100 mm 100x100 mm 200x100 mm 200x200 mm 400x200 mm
Screw type Metric 4x10
mm
Metric 4x10
mm
Metric 4x10
mm
Metric 6x10
mm Metric 6x10 mm

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POWER
Power Consumption 50W 55W 120W 130W 200W
Standby < 1W
Mains Power AC100-240V~,
50/60Hz
AC100-240V~,
50/60Hz
AC220-240V~,
50/60Hz
AC220-240V~,
50/60Hz
AC220-240V~,
50/60Hz
Audio Power 3W + 3W 3W + 3W 5W + 5W 5W + 5W 10W + 10W
Ambient Temperature 5°C - 35°C
PACKAGE CONTENTS
Supplied Accessories
TV unit x1
Power cord x 1
Remote control x1 (with two size AAA alkaline batteries)
User manual x1
Setup Guide x1

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2. Operating Instructions
POWER
Press to turn ON/OFF (standby) the TV.
SOURCE
Press repeatedly to choose the various
input sources.
Number buttons
Press to enter TV channel number to
select channel.
EPG
Press to display the Electronic
Programme Guide.
PRE CH
Press to display the previous channel.
HDMI
Press to choose HDMI source mode.
YPbPr
Press to choose YPbPr source mode.
VIDEO
Press to choose AV source mode.
PC
Press to choose PC source mode.
VOL+ / VOL-
Press + or - to adjust the volume.
CH Λ/ CH V
Press Λor V to browse through the TV
channels.
MUTE: Switch the sound ON/OFF.
TELETEXT
Press to display or close the Teletext.
MIX
Display the Teletext with TV.
SIZE
Press to change the font size: Full
screen, Top half and Bottom half.
SUBPAGE
Display the sub page (when available).
INDEX
Press to return to page 100 or the index
page.
SUBTITLE
• In TV mode: It works only for turning on
the subtitle and change to the next
page marked as subtitle.
• In Text mode: Select the next page
marked as a subtitle page and request
it as the display page.
ZOOM
Select the display aspect from Auto,
Normal (4:3), Wide (16:9), subtitle,
full screen, or 14:9 mode.
DUAL
Press to select from mono, stereo,
Dual I, or Dual II.
AUDIO ADJ
Press to choose from Personal,
Speech, Music.
VIDEO ADJ
Press to choose the Smart Picture
mode from Personal, Standard,
Movie, Vivid, Eco.
SLEEP
Press to set the preset time to switch
the TV to standby mode
automatically.
MENU/EXIT
Press to open or close menu.
▲, ▼, ◄, ►, OK
Press to adjust or confirm the various
function items on the menu.
INFO
Press to display or close the
information screen.
Colour buttons
• In TV mode: Follow the directions in
the OSD screen.
• In Text mode: Text control buttons.
HOLD
Press to stop the scrolling of pages.
The text decoder stops receiving
data.
REVEAL
Reveal hidden information such as
answers to a quiz.
FAV
Display the Favourite Channel List.
CH-LIST
Display the Channel List.
USB
Press USB to display the multimedia
selection screen.
FREEZE
Press to freeze the TV picture.

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2.2 To Use the Menus
1. Press the MENU/EXIT button to display or close the main menu
2. Use the Navigation Ring to move around to select, adjust or confirm an item in the OSD (On Screen Display)
menu.
Press the MENU/EXIT button to enter the main OSD. Adjust the items including Picture, Sound, TV, Features, and
Parental.
However, some function items in the menus may only be enabled in the particular source modes.
PICTURE MENU
The Picture menu in most source modes shows as below. It provides several video adjustment items for user fine
tuning the video display.
1. Smart Picture: To set the best picture appearance to a predefined picture setting from Standard, Vivid, Movie,
Eco, or Personal.
2. Brightness: To brighten the dark parts of the picture.
3. Contrast: To sharpen the picture quality.
4. Colour: To add or reduce colour.
5. Tint: To adjust the picture tint.
6. Sharpness: To improve detail.
7. Colour Temperature: To choose between Normal (neutral), Warm (redder), and Cool (bluer).
8. Advanced Control:
[Noise Reduction] - To filter out and reduces the image noise and improve picture quality. Select the effect degrees
from Off, Low, Medium, High, or Auto.
[Flash Tone] - To adjust the skin colour to be more natural.
[Back Light] - To make the background colour brighter or darker.
[DCR] - Dynamic Contrast Ratio (DCR) auto adjusts the brightness of the screen to show more depths in the darker
areas.
[HDMI Mode] - (HDMI only) User can select Auto/graphic/Video mode.
Description as following:
• Auto: Automatic to get device information, device will indicate sending timing is video timing or graphic timing (PC
timing).
• Graphic: Force video timing shows as graphic timing, for example: 720p shows 1280x720@60Hz; 1080i shows
1920x1080@60Hz. This mode optimizes for PC input.
• Video: Force graphic timing shows as video timing, for example:
1280x720@60Hz shows 720p;
1920x1080@60Hz shows 1080i.
This mode optimises for DVD player, camcorder, and other video appliances inputs.

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SOUND MENU
The Sound menu provides audio adjustment for user to modify the audio setting.
1. Sound Mode: To set the TV to a predefined sound setting from Personal, Music, or Speech.
2. Balance: To adjust the balance between left and right channels.
3. Virtual Surround: To add greater depth and dimension to the TV sound.
4. Digital Audio Out: To select the Digital Audio Out from Off or PCM.
5. SPDIF Delay: SPDIF Delay function will affect SCART/Line out audio also delay at that time. The Nor Dig HD IRD
shall support the possibility to adjust the audio delay on the SPDIF output (if available) up to 250 ms and it should be
adjustable in 10ms steps, as the IRD may have several different user set-ups, resulting in different a/v delays; e.g.
the IRD may be connected to several types of external audio amplifiers and the STB may be connected to several
types of external screens.
6. AVL: Choose On or Off to adjust volume to be consistent across programmes and channels automatically.
The following functions are only available for digital channels with audio signals.
7. Type: This function enables you to choose the type of the additional narration during the TV watching from
Normal, Hard of Hearing, or Audio Description.
Hard of Hearing: This function provides narration to deaf and hard of hearing viewers.
8. Audio description: When the Type is set to “Audio Description”, you can adjust the volume of the audio
description.

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TV MENU
1. Country: To select the relevant country.
This is the country you are in, or the country whose channels you want to receive if you live near its borders.
2. Audio Carrier (ATV only): Select Stereo, Dual 1, Dual 2, or Mono for ATV channel.
3. 1st and 2nd Audio: Use this function when two or more audio languages are broadcast. This is the language to
be used for digital channels if it is available.
4. Channels: Enter the channels submenu, and choose from Channel Scan, Update Scan, Single RF Scan, Analog
Manual Scan, Channel Skip, Channel Sort, Channel Edit, Decoder, and Analog CH Fine Tune.
[Channel scan] - Channel Scan will retune the television automatically. It is recommended to run the Channel Scan
periodically to ensure that all new services are added.
[Update scan] - Search the new channels automatically that are not in the channel list.
[Single RF Scan (Digital Only)] - Enter the Single RF Scan in the Channels submenu to scan digital channels.
[Analog Manual Scan] - The television can be tuned-in manually using Analog Manual Scan. Use the number keys

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to enter the Start Frequency to scan up or scan down.
[Channel skip] - To prevent certain programs from being viewed by pressing CH + / - buttons on the remote control,
the program position can be skipped.
Tip: The skipped program may not be found by pressing CH + / - buttons but can be access by pressing number
buttons directly.
Tip: The skipped program may not be found by pressing CH Λ/ V but can be accessed by pressing number
buttons directly.
[Channel sort] - Change the order of the Channel List.
[Channel Edit] - Enter the Channel Edit in the channels submenu to edit the channel number and channel name by
using the number buttons 0~9.
Note: The following RC number-mapping table will not be shown on the TV screen.
[Decoder (Analog only)] – Channel Decode support the Canal+ (paid television channel); however, the channel
also
broadcast some un-encrypted programs.
These programs without encryption can be viewed free of charge.
[Analog CH Fine Tune] - Select Analog CH Fine Tune in the Channels submenu to adjust the frequency.
FEATURES MENU
The Features menu in TV mode shows as below. This menu gives users the most flexibilities to satisfy their
generally demands. According to the various requirements in different source modes, certain features should be
hidden (disable) on the menu. The details footnotes will be described clearly below.

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1. Menu Language: To select the on-screen display menu language.
2. Picture Format: To select the available display format from Auto, Normal, Native (HDMI only), Zoom 1, Zoom2,
or Wide.
3. Time:
[Time Zone] - To select the time zone you are in.
[Time] - To set the time and date or select auto synchronization.
Tip: Before you want to set the time and date by your own, please make sure Auto synchronization is Off.
[Sleep Timer] - To set the TV to turn itself off within a certain time.
4. Subtitle:
[Analog Subtitle] - To display the transmitted subtitle on the screen. Either this text can be permanently displayed
(assuming that the service is available in the broadcast) or only when mute is active.
[Digital Subtitle] - Use the Digital Subtitle function when two or more subtitle languages are broadcasted. If subtitle
data in a selected language is not broadcasted, the default language subtitle will be displayed.
[Subtitle Type] - To choose the subtitle type from normal or hearing impaired.
5. Teletext Language:
[Digital Teletext Language] - To select the teletext language.
[Decode Page Language] - To set the teletext language to the regional location.
6. Common Interface: This menu appears with your CI supplier information.
7. HDMI Scan Info (HDMI only):
[Automatic] - Set to underscan or overscan automatically when the video signal is detected.
[Underscan] - When the video signal is detected, all active pixels and lines are displayed with or without border.
[Overscan] - When the video signal is detected, some active pixels and lines at the edges are not displayed.
8. Reset Default: To reset all TV settings to the original factory values.
PARENTAL MENU
Enable you to control special functions for the TV channels.
1. Channel Block: To block certain TV channels.

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2. Parental Guidance: To control access programs based on their age ratings. All settings apply to digital channels.
Note: This function operates according to information from the broadcasting station. Therefore if the signal has no
information, this function does not operate.
3. Input Block: To disable the specific external input signals.
4. Set Password: To set or change your password. Please follow the instructions to set it. All number combinations
from 0000 to 9999 are valid.
Tip: Remember that 5351 is the default Change Password code. If your access code has been changed or you have
forgotten the code, you can always get in by inputting the default code.
5. Clear All: To clear all the settings in the parental submenu.
COMMON INTERFACE MODULE
- The Common Interface CI Slot, is designed to accept the Conditional Access CA Module coupled with a Smart
card,
in order to view pay TV programmes and additional services. Contact your Common Interface service provider for
further information about modules and subscription options. Please note that CA modules and smart cards are not
included, or supplied as optional extras by us.
WARNING: Switch off your TV before any module is inserted into the Common Interface slot.
1. Correctly insert the CA Module and then the Smart Card into the CI slot located at the side of the TV.
2. Turn on the TV and press MENU and select the TV submenu. “Common interface” will be displayed if the CA
module is detected. Wait for few moments until the card is activated.

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3. Select Common Interface to view the menu options and information on the inserted CI card.
4. Press OK to access the card menu, for more details refer to the module’s instruction manual.

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5. When module is removed, the “Common Interface” menu will disappear from the screen.
OAD OPERATION
OAD for Software Update function:
1. When you get the updating news from the TV shop’s web, you can update the operation software using the
Download
menu. The data for various units are transferred consecutively on a special receiving channel.
2. You need to search the channel with updating code stream. (Note: you can get information from the TV shop or
internet.)
Operation
1. When you search the channel. You will get a information.
2. Press ▲▼to confirm if you would like to “Accept” this new software or “Reject“ and use ►button to action
update new software.

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3. After the programming, please use to confirm if you would like to restart the TV.
The software will be updated completely after restart the TV.
NOTE: You must not switch off the unit during this process!

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2.3 How to Connect
①COMMON INTERFACE (CI) – Conditional Access Module (CAM) use only. Please contact your service provider
for details.
②、③、④AV IN – Connect the primary source for composite video devices, such as a VCR or video game. Use the
white and red connectors to connect the external audio from the same source.
⑤USB –Technician service use only.
⑥Earphone Output – Connect to the headphones. When the headphone is inserted to the plug, all the speakers
will be muted.
⑦TV ANTENNA – Connect to an antenna or digital cable (out-of-the-wall, not from Cable Box) for Digital TV.*
⑧、⑬SCART – Connect the video recorder or decoder to the television. Full SCART transmits RGB, CVBS video
in/out, and audio in/ out; HALF SCART transmits S-Video, CVBS video in/out, and audio in/ out.
Note: SCART1/2 has monitor out. (CVBS/YPbPr/ATV/DTV)
⑨PC IN – Connect the video and audio cables from a computer here.
⑩COMPONENT (Y/Pb/Pr with Audio L/R) – Connect the primary source for component video devices such as a
DVD Player or set top box here.
⑪SPDIF (Digital Audio Out) – When a digital audio signal is associated with the input selected for viewing, the
digital audio will be available on this SPDIF connection to your home theatre system.
⑫、⑭、⑮ HDMI – Connect the primary source for digital video such as a DVD multimedia player or set top box
through this all digital connector.
Once your equipment is connected, use the following procedure to view the input signal:
Press the SOURCE button on the remote controller to select the relevant source to view. (ex: Press YPbPr button to
select “YPbPr” if you have connected a video recorder to Component socket.)

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2.4 Front Panel Control Knobs
1 VOL + VOL +: Press to increase the sound volume level.
2. VOL - VOL -: Press to decrease the sound volume level.
3. CH ▲CH ▲: Press to select the next higher Programme number.
4. CH ▼CH ▼: Press to select the next lower Programme number.
5. MENU Menu key: Press to open or exit the OSD (on-screen display) menu.
6. INPUT Input key: Press to select the input source.
7. POWER
Power key: Press to turn on/off (standby) the TV set. (Press to turn on TV after
the power on status, LED had changed to the Blue colour and stopped flashing.)

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3. Input/Output Specification
3.1 Sinal Connectors
VGA
Pin No. Description Pin No. Description
1 Red 9 +5V (Supply From PC)
2 Green 10 Sync GND
3 Blue 11 GND
4 GND 12 Bi-Directional Data(SDA)
5 Self Test 13 H. Sync
6 Red Ground 14 V. Sync
7 Green Ground 15 Data Clock(SCL)
8 Blue Ground
HDMI
Pin No. Description Pin No. Description
1 TMDS Data2+ 11 TMDS Clock Shield
2 TMDS Data2 shield 12 TMDS Clock-
3 TDMS Data2- 13 CEC
4 TMDS Data1+ 14 Reserved (N.C. on device)
5 TMDS Data1 shield 15 SCL
6 TMDS Data1- 16 SDA
7 TMDS Data0+ 17 DDC/CEC Ground
8 TMDS Data0 shield 18 +5V Power
9 TMDS Data0- 19 Hot Plug Detect
10 TMDS Clock+
Full Scart
Pin No. Description Pin No. Description
1 Audio Output Right 12 N.C.
2 Audio Input Right 13 GND(Red)
3 Audio Output Left 14 GND(Blanking)
4 GND(Audio) 15 Red Input
5 GND(Blue) 16 RGB Switching Control
6 Audio Input Left 17 GND(Video Input & Output)
7 Blue Input 18 GND(RGB Switching Control)
8 Switch Signal Input (Fast Blanking) 19 Video Output(Composite)
9 GND(Green) 20 Video Input(Composite)
10 N.C. 21 Common Ground
11 Green Input

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3.2 Video/Audio Signal
●TV RF input system - Aerial or cable should support PAL/SECAM/DVB-T
●TV RF input level - 10mV (80dBuV) typical, 30dBuV ~ 100dBuV receiving capability, terminated with input
impedance of 75Ω.
●CVBS input - 1000mVpp (including 300 mV sync level), terminated with input impedance of 75Ω.
●S-Video input - Y: 1000mVpp (include sync), C: 300mVpp terminated with Input Impedance of 75Ω.
●Component video input - Y: 1000mVpp (include sync), PbPr: 700mVpp terminated With Input impedance of 75Ω.
Support 480i/p, 576i/p, 720p, 1080i at 50Hz or 60Hz refresh rate.
●Audio input - Sensitivity 500mV (rms). For rated power, the amplifier should be able to handle input
signal up to 2.0V, input impedance >10KΩ.
●SCART input / output - Full SCART, includes RGB in, CVBS (audio L/R) in/ (Monitor out).
Half SCART includes S-Video in, CVBS (audio L/R) in/ (Monitor out).
●HDMI (High Definition Multimedia Interface)-
Support 480i /480p, 576i/576p, 720p, 1080i format with HDCP
Digital interface with 4 channels TMDS signal
●CI Slot - PCMCIA card 5V input.
●PC VGA input - 700 mV input level, TTL level sync, RGB in, 75Ωimpedance.
●PC Audio input - 500 mVrms input level, impedance > 10 kΩ.
●Headphone output - 5mW (Typ.) at 32Ω, impedance between 8 – 600Ω.
●SPDIF output - Level: +/- 0.5V, Square Wave.
●Amplifier output - 10W+/-10%
●Speaker - 6Ω

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3.3 Video Input Format
Physical Inputs Format
PAL from RF 720 x 576 @50i
SECAM from RF 720 x 576 @50i
Side, SCART (CVBS,RGB and Y/C)
720 x 576 @50i
720 x 480 @60i
Component
720 x 480 @60i
720 x 480 @60p
720 x 576 @50i
720 x 576 @50p
1280 x 720 @60p
1280 x 720 @50p
1920 x 1080 @60i
1920 x 1080 @50i
HDMI
720 x 480 @60i
720 x 480 @60p
720 x 576 @50i
720 x 576 @50p
1280 x 720 @50p
1280 x 720 @60p
1920 x 1080 @50i
1920 x 1080 @60i
1920 x 1080 @25p
1920 x 1080 @30p
640 x 480 @60Hz
800 x 600 @60Hz
1024 x 768 @60Hz
1360 x 768 @60Hz