Haier L26K3 User manual

Order No.
LCD TV
Model No.
Classis
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair
the product or products dealt with in this service information by anyone else could result in serious injury or death.
Haier Group
©2009 Qingdao Haier Electronics Co., Ltd.
All rights reserved. Unauthorized copying and distribution is a violation of law.
SERVICE MANUAL
WARNING
TV0912S010V0
MST6M69FL
L26K3,L32K3,L42K3

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CONTENTS
Chapter 1.General Information
1-1. Document Information........................................................................... 3
1-2. General Guidelines ................................................................................ 3
1-3. Important Notice ..................................................................................... 3
1-3-1. Follow the regulations and warnings ..................................................... 3
1-3-2. Be careful to the electrical shock........................................................... 3
1-3-3. Electro static discharge (ESD)............................................................... 3
1-3-4. About lead free solder (PbF).................................................................. 4
1-3-5. Use the genewing parts (specified parts) .............................................. 4
1-3-6. Safety check after repairment................................................................ 4
1-3-7. Ordering Spare Parts............................................................................. 6
1-3-8. Photo used in this manual ..................................................................... 6
1-4. How to Read this Service Manual ...................................................... 6
1-4-1. Using icons: ........................................................................................... 6
Chapter 2. Specification
2-1. Specification list ...................................................................................... 8
2-2. External pictures (four faces) ..............................................................11
Chapter 3. Disassemble and Assemble
3-1.L26K3 ......................................................................................................17
3-2.L32K3
3-3.L42K3
Chapter 4. Location of Controls and Components
4-1. Board Location
.............................................................................................24
4-2. Main Board
4-2-1. Function Description: ...........................................................................24
4-2-2. Connector definition .............................................................................25
4-3. Power Supply Board.............................................................................28
4-3-1. Function description:............................................................................28
......................................................................................................19
......................................................................................................21
....
........................................................................................23
4-3-2. Connector definition: ............................................................................28

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4-4. LCD Panel ..............................................................................................31
4-4-1. Function Description: Display the signal. .............................................31
4-4-2. Connector definition: ............................................................................31
Chapter 5. Installation Instructions
5-1. Accessories
.....................................................33
5-2.External Equipment Connections
............................................................................................33
Chapter 6. Operation Instructions
6-1. Front Panel Controls ............................................................................38
6-2. Back Panel Controls ............................................................................38
6-3. Setting Up Your Remote Control ......................................................39
Chapter 7. Electrical Parts
7-1. Block Diagram .......................................................................................40
7-2. Circuit Diagram .....................................................................................41
7-3. Wiring Connection Diagram ...............................................................53
8-1. Service Mode .......................................................................................56
8-1-1.How to enter into Service Mode............................................................56
8-1-2.How to exit ............................................................................................56
8-2. Measurements and Adjustments ......................................................56
8-2-1. Version, S/N, Panel Resoution ............................................................56
8-2-2. Video ....................................................................................................57
8-2-3. Audio ....................................................................................................57
8-2-4. Channel ...............................................................................................57
8-2-5. Funtion .................................................................................................58
8-2-6. Adjust ..................................................................................................58
8-2-7.Timer .....................................................................................................58
Chapter 9. Trouble shooting
9-2. Mainboard Failure Check ..................................................................60
9-3. Pannel Failure .......................................................................................61
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Chapter 8. Measurements and Adjustments
9-1. Simple check .........................................................................................59 9
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Chapter 1.General Information
1-1. Document Information
Document format: Adobe PDF
Author:
Compiler:
1-2. General Guidelines
When servicing, observe the original lead dress. If a short circuit is found, replace all parts which
have been overheated or damaged by the short circuit.
After servicing, see to it that all the protective devices such as insulation barriers, insulation papers
shields are properly installed.
After servicing, make the following leakage current checks to prevent the customer from being
exposed to shock hazards.
1) Leakage Current Cold Check
2) Leakage Current Hot Check
3) Prevention of Electro Static Discharge (ESD) to Electrostatically Sensitive
1-3. Important Notice
1-3-1. Follow the regulations and warnings
Most important thing is to list up the potential hazard or risk for the service personnel to open
the units and disassemble the units. For example, we need to describe properly how to avoid the
possibility to get electrical shock from the live power supply or charged electrical parts (even the
power is off).
This symbol indicates that high voltage is present inside.It is dangerous to make any
kind of contact with any inside part of this product.
This symbol indicates that there are important operating and maintenance instructions
in the literture accompanying the appliance.
1-3-2. Be careful to the electrical shock
To prevent damage which might result in electric shock or fire, do not expose this TV set to
rain or excessive moisture. This TV must not be exposed to dripping or splashing water, and
objects filled with liquid, such as vases, must not be placed on top of or above the TV.
1-3-3. Electro static discharge (ESD)

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Some semiconductor (solid state) devices can be damaged easily by static electricity.
Such components commonly are called Electrostatically Sensitive (ES) Devices. The following
techniques should be used to help reduce the incidence of component damage caused by
electros static discharge (ESD).
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid-state) devices can be damaged easily by static electricity. Such
components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical
ES devices are integrated circuits and some field-effect transistors and semiconductor "chip"
components. The following techniques should be used to help reduce the ncidence of component
damage caused by static by static electricity.
1. Immediately before handling any semiconductor component or semiconductor-equipped
assembly, drain off any electrostatic charge on your body by touching a known earth ground.
Alternatively, obtain and wear a commercially available discharging wrist strap device, which
should be removed to prevent potential shock reasons prior to applying power to the unit under
test.
2. After removing an electrical assembly equipped with ES devices, place the assembly on a
conductive surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of
the assembly.
1-3-4. About lead free solder (PbF)
This product is manufactured using lead-free solder as a part of a movement within the
consumer products industry at large to be environmentally responsible. Lead-free solder must be
used in the servicing and repairing of this product.
1-3-5. Use the genewing parts (specified parts)
Special parts which have purposes of fire retardant (resistors), high-quality sound (capacitors),
low noise (resistors), etc. are used.
When replacing any of components, be sure to use only manufacture's specified parts shown in
the parts list.
Safety Component
ƔComponents identified by mark have special characteristics important for safety.
1-3-6. Safety check after repairment
Confirm that the screws, parts and wiring which were removed in order to service are put in the
original positions, or whether there are the positions which are deteriorated around the serviced
places serviced or not. Check the insulation between the antenna terminal or external metal and
the AC cord plug blades. And be sure the safety of that.
General Servicing Precautions

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1. Always unplug the receiver AC power cord from the AC power source before:
a. Removing or reinstalling any component, circuit board module or any other receiver
assembly.
b. Disconnecting or reconnecting any receiver electrical plug or other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic capacitor in the receiver.
CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors
may result in an explosion hazard.
2. Test high voltage only by measuring it with an appropriate high voltage meter or other voltage
measuring device (DVM, FETVOM, etc) equipped with a suitable high voltage probe.
Do not test high voltage by "drawing an arc".
3. Do not spray chemicals on or near this receiver or any of its assemblies.
4. Unless specified otherwise in this service manual, clean electrical contacts only by applying
the following mixture to the contacts with a pipe cleaner, cotton-tipped stick or comparable non-
abrasive applicator; 10% (by volume) Acetone and 90% (by volume) isopropyl alcohol (90%-99%
strength).
CAUTION: This is a flammable mixture.
Unless specified otherwise in this service manual, lubrication of contacts is not required.
Capacitors may result in an explosion hazard.
5. Do not defeat any plug/socket B+ voltage interlocks with which receivers covered by this
service manual might be equipped.
6. Do not apply AC power to this instrument and/or any of its electrical assemblies unless all
solid-state device heat sinks are correctly installed.
7. Always connect the test receiver ground lead to the receiver chassis ground before connecting
the test receiver positive lead.
Always remove the test receiver ground lead last. Capacitors may result in an explosion
hazard.
8. Use with this receiver only the test fixtures specified in this service manual.
CAUTION: Do not connect the test fixture ground strap to any heat sink in this receiver.
9. Remove the antenna terminal on TV and turn on the TV.
10. Insulation resistance between the cord plug terminals and the eternal exposure metal should
be more than Mohm by using the 500V insulation resistance meter.
11. If the insulation resistance is less than M ohm, the inspection repair should be required.
If you have not the 500V insulation resistance meter, use a Tester. External exposure metal:
Antenna terminal Headphone jack.

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12. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
13. Use only an anti-static type solder removal device. Some solder removal devices not
classified as "anti-static" can generate electrical charges sufficient to damage ES devices.
14. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to
damage ES devices.
15. Do not remove a replacement ES device from its protective package until immediately
before you are ready to install it.
(Most replacement ES devices are packaged with leads electrically shorted together by
conductive foam, aluminum foil or comparable conductive material).
16. Immediately before removing the protective material from the leads of a replacement ES
device, touch the protective material to the chassis or circuit assembly into which the device will
be installed.
CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other safety
precautions.
17. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise
harmless motion such as the brushing together of your clothes fabric or the lifting of your foot
from a carpeted floor can generate static electricity sufficient to damage an ES device.)
1-3-7. Ordering Spare Parts
Please include the following informations when you order parts. (Particularly the Version letter)
1. Model number, serial number and software version
The model number and serial number can be found on the back cover of each product. Software
version can be found in the Spare Parts List.
2. Spare part No. and description
Spare part No. and description can be found in the Spare Parts List.
1-3-8. Photo used in this manual
The illustration and photos used in this Service Manual may not base on the final design of
products, which may differ from your products in some way.

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1-4. How to Read this Service Manual
1-4-1. Using icons:
Icons are used to attract the attention of the reader to specific information. The
meaning of each icon is described in the table below:
Note:
A “note” provides information that is not indispensable, but may nevertheless be
valuable to the reader, such as tips and tricks.
Caution:
A “caution” is used when there is danger that the reader, through incorrect
manipulation, may damage equipment, loose data, get an unexpected result or has to
restart(part of) a procedure.
Warning:
A “warning” is used when there is danger of personal injury.
Reference:
A “reference” guides the reader to other places in this binder or in this manual,
where he/she will find additional information on a specific topic.

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Chapter 2. Specification
2-1. Specification list
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Service Manual
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ˊˆʳ
ˡ˸ʳ˷˼˸˼ʳ
ʻ˜˶˿˷˼˺ʳ˕˴˸ʼʳ
ʳ
˄˃˅˄ˁˋʽ˅ˌ˃ˁˆʽˊ˃ˇˁˇ
ˊˇʳ ˣ˴˶˾˴˺˸˷ʳ
˷˼˸˼ʳʳ
˄˄˄˃ʽˆˉ˃ʽˊˌ
ˈʳ
ˊˈʳ
ˣ˴˶˾˴˺˸˷ʳ
˷˼˸˼ʻ˜˶˿˷˼
˺ʳ˕˴˸ʼʳʳ
ˊˆˉʽ˅ˆˌʽˈˊˉ
ʳ
˄˄˄˃ʽˆˉ˃ʽˊˌ
ˈʳ
ˊˉ
˗˸˼˺ʳ
˴˴˸
˸ʳ
Service Manual
Model No.:
10
ˉ˃
ˉ˄
ˉˈʳ
˩˿˴˺˸ʳ˴˺˸ΰ˩α
ˉˋ
ˊ˃
ˡˁ ˠ˷˸˿ ˟˅ˉ˞ˆ ˟ˆ˅˞ˆ ˟ˇ˅˞ˆ
˅˅˅
ˡ ˡ ˡ
˅ʽˈ˪ ˅ʽˈ˪ ˅ʽˈ˪
ˡ ˡ ˡ
ˉ˃˪ ˊ˃˪ ˄˅˃˪
˄ˈ˃ˀ˅ˇ˃˩ ˄ˈ˃ˀ˅ˇ˃˩ ˄ˈ˃ˀ˅ˇ˃˩
ˈ˃˂ˉ˃˛ ˈ˃˂ˉ˃˛ ˈ˃˂ˉ˃˛
˄˅˃ ˄˅˃ ˄˅˃
ˡ˸ʳ˸˼˺˻ʳ˾˺
˚ʳ˸˼˺˻ʳ˾˺
ˊ˅ʳ
ˡ˸ʳ˷˼˸˼ʻʼʳ ˉˉˆˁˈʽ˄˃˃ʽˇˇˌ ˊˌˋʽˌ˃ʽˈ˅ˈʳ
˄˃ˁˉ˅
˄˅ˁˉ
˄ˆˁ˄˅
˄ˈˁ˄
ˉˉˆˁˈʽ˅˃˃ʽˇˌˊ ˊˌˋʽ˅ˆ˃ʽˈˊˈ
ˊˆˉʽ˅ˆˌʽˈˊˉ ˋˊ˃ʽ˅ˉˊʽˉˈˊ
ˋˊ˃ʽ˅ˉˊʽˉˈˊ

Service Manual
Model No.:
11
2-2. External pictures (four faces)
Front Side
Left Side
2-2-1 L26K3

Service Manual
Model No.:
12
Right Side
Back Side

Service Manual
Model No.:
13
Front Side
Left Side
2-2-2 L32K3

Service Manual
Model No.:
14
Right Side
Back Side

Service Manual
Model No.:
15
Front Side
Left Side
2-2-3 L42K3

Service Manual
Model No.:
16
Right Side
Back Side

Chapter 3. Disassemble and Assemble
3-1. L26K3
1. Lay down the unit so that back cover faces
upward
3. Remove the stand
Service Manual
Model No.:
17
4 Screws(ST4*16)
2. Remove the four screws indicated with
the blue lines in the picture above.
12 Screws(ST4*12)
2 Screws(ST3*10)
3-1-3. Remove the mainboard and
power supply
6 Screws(M2.5*8)
4 Screws(M3*8)
3-1-1. Remove the Stand 3-1-2. Remove the Back Cover
1. Remove the thirteen screws indicated

Remove the two screws indicated by the
blue lines in below picture.
Service Manual
Model No.:
18
3-1-4. Remove the Speaker
2 Screws(ST4*8)
2 Screws(ST3*10) 1 Screws(ST3*10)
3-1-5. Remove the screws fastened
the panel
3-1-6. Remove the Keypad Assembly
and Remote Control Board Assembly

3-2. L32K3
1. Lay down the unit so that back cover faces
upward
3. Remove the stand
3-2-2. Remove the Back Cover
1. Remove the fifteen screws indicated
Service Manual
Model No.:
19
2. Remove the six screws indicated with
the blue lines in the picture above.
3-2-3. Remove the power supply
4 Screws(M3*8)
3-2-1. Remove the Stand
12 screws (ST4*12)
2. Then remove the cables of DSMB indicated
with the blue lines in the picture below.
3-2-4. Remove the mainboard and
bracket of Side AV
4 Screws(M3*8)
3-2-5. Remove the metal slice of
the mainborad and power supply
7 Screws(M4X8)
Bottom
4 Screws(M4*12)