Haier L26B1120b, LE26B13200b, LE19B13200e Service Manual

SERVICE MANUAL

LCD TV

Model No. L26B1120b

Chassis

MSD318

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.

WARNING

1-1. Table of Contents

1. General Information...........................................................................

1-1. Table of Contents

1-3. Important Notice

1

Chapter 1: General Information

1

3

1-2. General Guidelines

1-4. How to Read this Service Manual

3
6

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- 01 -

3. Location of Controls and Components...........................................

3-1. Board Location

3-2. Main Board & AV Board

3-3. Power Board

3-4. LCD Panel

4. Disassemble and Assemble..........................................................

4-1 Remove the Pedestal

7

88

8

8

11

12

14

14

4-2 Remove the Back Cover 14

4-3 Remove the Terminal Bracket

15

4-4 Remove the Power Module 15

4-5 Remove the Main Board 15

4-6 Remove the Speaker 16

4-7 Remove the Remote Control Board 16

5. Installation Instructions..…....………………...........………….........

16

5-1 External Equipment Connections 16

5-2 HDMI Connections 20

6. Operation Instructions....…....………………...........………….........

23

6-1 Front Panel Controls

6-2 Back Panel Controls

6-3 Universal Remote Control

23

23

24

7. Electrical Parts…....………………...........………….........................

25

7-1. Block Diagram

7-2. Circuit Diagram

7-3. Wiring Connection Diagram

25

26

35

8. TV Operation........………….............................................................

36

- 02 -

9. Trouble-shooting…………..............................................................

43

9-1. Simple Check 43

9-2. Main Board Failure Check

9-3. Panel Failure

44

53

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 king 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

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to rain or excessive moisture. This TV must not be exposed to dripping or splashing water,

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1-3-3. Electro static discharge (ESD)

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).

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.

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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

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- 03 -

1-3-6 Safety Check after Repairment

- 04 -

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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

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".

5. Do not defeat any plug/socket B+ voltage interlocks with which receivers covered by this
service manual might be equipped.

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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).

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Capacitors may result in an explosion hazard.

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.

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

- 05 -

Electrostatically Sensitive (ES) Devices

1-3-7. Ordering Spare Parts

1. Immediately before handling any semiconductor component or semiconductor­equipped 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.

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to damage ES devices.

7. 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.

3. Use only a grounded-tip soldering iron to solder or unsolder 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.

4. Use only an anti-static type solder removal device. Some solder removal devices not

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6. 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).

8. Minimize bodily motions when handling unpackaged replacement ES devices.
(Otherwise harmless motion such as the brushing together of your clothes fabric or the

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an ES device.)

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 of each product and the
Software Version can be found at the Spare Parts List.

2. Spare Part No. and Description

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- 06 -

1-3-8. Photo used in this manual

The illustration and photos used in this Manual may not base on the final design of
products, which may differ from your products in some way.

1-4. How to Read this Service Manual

Using Icons:

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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/

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Service Manual

Model No.:

- 07 -

2. Speci¿cations

Model L26B1120

Screen Size 26 inch

Aspect Ratio 16:9

Resolution 1366*768

Response Time (ms)

6.5 (GRAY TO

GRAY)

Angel of View

+88/-88(H), +88/-88

(V) Typ.

Color Display 16777216

No. of Preset Channels

Cable :1-135/ Air:

2-69(ATV&DTV)

OSD Language English

Color System NTSC/PAL/SECAM

Audio System M

Audio Output Power

(Built-in) (W)

5W×2

Audio Output Power

(outer) (W)

No

Total Power Input (W) 80 W

Voltage Range (V) AC100V-240V

Power Frequency (Hz) 50~60Hz

Net Weight (KG)

Gross Weight (KG) 10

Net Dimension (MM) 660*215*500

Packaged Dimension

(MM)

861*171*546

8.4

- 08 -

3. Location of Controls and Components

3-1 Board Location

3-2 Main Board

No. Description

A Board Main Board

B Board Power Board

A Board

B Board

TB300711301M

514C2600M12

- 09 -

3-2-1 Function Description:

Main Board

Process signal which incept from exterior equipment then translate into signal that panel
can display.

3-2-2 Connector defnition

Main board connector

Power connectors (J15ˈJ16)

J16

J15

Pin number Signal name Pin number Signal name
1 +5V 1 GND

GND

4 4 +5V

5 POWER ON/OFF
6 +5VSTB

7 +5V

9 GND
10 GND
11 GND
12 +12V
13 +12V

Notes:

J16-Pin 2: Backlight on/off:
The system c an t urn o n or turn off t he backlight of TFT LCD P anel t hrough the power
supply unit path.

CN115-Pin 5: System power on / standby

System board will use this pin to control system power.
J16-Pin 3: Control the luminance of backlight
The system can generate the P WM s ignal to control the strength of TFT LCD Panel’s
backlight through this connector

2

2

J15

5

GND

8 +5V

+5V

3 3 +5V

BL-ADJUST

BL_ON/OFF

- 10 -

Pin number Signal name Description
1 LED_R LAMP RED
2 LED_G LAMP GREEN
3
4 IR REMOTE CONTROL
5 GND GND
6 5V POWER FOR REMOTE

Pin number Signal name Description
1 KEY1
2 KEY0
3 GND

remote connector (J6)

Keypad and connector (J7)

Speaker connector J11

Pin number Signal nameD escription

+KPSR+KPSR1

-KPSR-KPSR2

-KPSL-KPSL3
+KPSL+KPSL4

3-3. Power Board

3-3-1 Function Description:

Supply power for Main board, Panel.

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- 11 -

CN13

Pin number Signal name

9 GND

GND

GND

GND

GND

10 GND
11 GND
12 +12V
13 +12V

POWER ON/OFF
+5VSTB

+5V
+5V

CN5

GND

DM

BK

SB

PM

3-4. LCD Panel

- 12 -

MTC260TVM-C02H(CMO:V260B2-P03)

- 13 -

3-4-1 Function Description: Display the signal.

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CN1 Connector Pin Assignment

Pin No. Symbol Description Note

1 NC No connection

(2)

2 NC No connection

(2)

3 NC No connection

(2)

4 GND Ground
5 RX0- Negative transmission data of pixel 0
6 RX0+ Positive transmission data of pixel 0
7 GND Ground
8 RX1- Negative transmission data of pixel 1

9 RX1+ Positive transmission data of pixel 1
10 GND Ground
11 RX2- Negative transmission data of pixel 2
12 RX2+ Positive transmission data of pixel 2
13 GND Ground
14 RXCLK- Negative of clock
15 RXCLK+ Positive of clock
16 GND Ground
17 RX3- Negative transmission data of pixel 3
18 RX3+ Positive transmission data of pixel 3
19 GND Ground
20 NC No connection

(2)

21 SELLVDS Select LVDS data format

(3)

22 NC No connection

(2)

23 GND Ground
24 GND Ground
25 GND Ground
26 VCC Power supply: +12V
27 VCC Power supply: +12V
28 VCC Power supply: +12V
29 VCC Power supply: +12V
30 VCC Power supply: +12V

Note (1) Connector Part No.: FCI, 10041195-001 or compatible

Note (2) Reserved for internal use. Please leave it open.

Note (3) High or OPEN: Normal, Ground: JEIDA LVDS format

Please refer to 5.4 LVDS INTERFACE (Page 14)

4. Disassemble and assemble

4-1 Remove the Pedestal 4-3. Remove the adhesive tape

(The location of the adhesive tape as follows)

Remove the adhesive tape indicated on the

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faces upward

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4-2Remove the Back Cover

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unit.

- 14 -

4-3 Remove the Terminal Bracket

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4-4 Remove the power module

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4-5 Remove the Main board

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CN513 J6 J7 J9 J15 J16 J11

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- 15 -

4-6 Remove the speaker

Take out the speaker

4-7 Remove the remote control

Remove the screw, take out the remote
control board

- 16 -

5. Installation Instructions

5-1 External Equipment Connections

Accessories

Remote Control

User GUIDE

Battery

1

ENTER

RETURN

DISPLAY

2

3

4

5 6

7 8 9 0

+

CH

_

+

_

VOL

SUBTITLE AUDIO

SLEEP V-CHIP CC

AUTO

S.M

EXIT

P.M

TV DISPLAY

SOURCE

MENU

MTS/SAP

MUTE

POWER

ASPECT

DVD/USB

RECALL

GOTO MENU SETUP

- 17 -