Akai LEA-19H03P Schematic

LEA-19H03P

SERVICE MANUAL

LCD TV

Model No.

MT8222

LEA-19H03P

Chassis

WARNING

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.

CONTENTS

Chapter 1.General Information

Service Manual

Model No.:LEA-19H03P

1-1. Document Information
1-2. General Guidelines
1-3. Important Notice

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

..................................................................................... 3

1-4. How to Read this Service Manual

1-4-1. Using icons: ........................................................................................... 6

........................................................................... 3

................................................................................3

...................................................... 6

Chapter 2. Specification

2-1. Specification list

2-2. External pictures (four faces)

...................................................................................... 8

..............................................................9

Chapter 3. Disassemble and Assemble

3-1. Remove the Stand
3-2. Remove the Back Cover
3-3. Remove the Remove the Main Board & Small Board
3-3-1. Remove the Mainboard and the Driver Board

3-3-2. Remove the Remote Control Board..................................................... 12

3-3-3. Remove the Keypad Board.................................................................. 12

3-3-4. Remove the Speakers ......................................................................... 12

............................................................................... 11

..................................................................... 11

................. 12

........................... 12

Chapter 4. Location of Controls and Components

4-1. Board Location
4-2. Main Board

4-2-1. Function Description: ........................................................................... 14

4-2-2. Connector definition .............................................................................14

4-3. Driver Board

4-4. Remote Control Board
4-5. LED Panel

4-4. LCD Panel

...................................................................................... 13

........................................................................................... 13

........................................................................................... 16

.....................................................................16

.............................................................................................16

.............................................................................................. 16

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Service Manual

Model No.:LEA-19H03P

Chapter 5. External Equipment Connections

5-1. Antenna Connection
5-2. VCR Connection
5-3. DVD Connection
5-4. HDMI or DVI Connection
5-5. PC Connection

...................................................................................... 19

5-6. Monitor Out Connection
5-7. Headphones Connection
5-8. Power Source

........................................................................................20

5-9. Recommendation input Format

............................................................................ 17

................................................................................... 18

................................................................................... 18

.................................................................... 18

...................................................................... 19

.................................................................... 20

........................................................ 20

Chapter 6. Operation Instructions

6-1. Front Panel Controls
6-2. Back Panel Controls

............................................................................ 21

............................................................................ 21

Chapter 7. Electrical Parts

7-1. Block Diagram
7-2. Wiring Connection Diagram

....................................................................................... 22

............................................................... 22

7-3. Circuit Diagram

..................................................................................... 22

Chapter 8. Measurements and Adjustments

8-1. Service Mode

8-1-1.How to enter into Service Mode............................................................ 23

8-1-2.How to exit ............................................................................................ 23

8-2. Measurements and Adjustments

8-2-1. Factory Menu 1 ....................................................................................23

8-2-2. Factory Menu 2 ....................................................................................24

8-2-3. Factory Menu 3 ....................................................................................25

8-2-4. Factory Menu 4 ....................................................................................25

8-2-5. Factory Menu 5 ....................................................................................26

8-2-6. Factory Menu 6 ....................................................................................26

....................................................................................... 23

...................................................... 23

Chapter 9. Trouble shooting

9-1. Simple check
9-2. Mainboard Failure Check.
9-3. Pannel Failure

......................................................................................... 27

.................................................................. 28

...................................................................................... 29

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Service Manual

Model No.:LEA-19H03P

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)

3

Service Manual

Model No.:LEA-19H03P

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
should be removed to prevent potential shock reasons prior to applying power to the unit under
test.

and wear a commercially available discharging wrist strap device, which

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

● Components 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

4

Service Manual

Model No.:LEA-19H03P

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:

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 non­abrasive applicator; 10% (by volume) Acetone and 90% (by volume) isopropyl alcohol (90%-99%
strength).

CAUTION:

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.

A wrong part substitution or incorrect polarity installation of electrolytic capacitors

This is a flammable mixture.

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
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:

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.

Do not connect the test fixture ground strap to any heat sink in this receiver.

receiver ground lead to the receiver chassis ground before connecting

5

Service Manual

Model No.:LEA-19H03P

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:

precautions.

17. Minimize bodily motions when handling unpackaged replacement ES devices. (

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.)

Be sure no power is applied to the chassis or circuit, and observe all other safety

Otherwise

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.

6

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.

Service Manual

Model No.:LEA-19H03P

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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Service Manual

Model No.:LEA-19H03P

Chapter 2. Specification

2-1. Specification list

Model LEA-19H03P

Screen Size 19 inches

Aspect Ratio 16:9

Resolution 1366*768

Response Time (ms) 5ms

Angel of View H:170/V:160

Color Display 16.7M

No. of Preset Channels 256

OSD Language English Russian

Color System SECAM

Audio System BG

Audio Output Power (Built-in) (W) 2.5W*2

Audio Output Power (outer) (W) No

Total Power Input (W) 30W

Voltage Range (V) AC100V~240V

Power Frequency (Hz) 50~60Hz

Time of Sleep Timer (MINS) 120Min

Net Weight (KG) 3.2

Gross Weight (KG) 4

Net Dimension (MM) 461*349*160

Packaged Dimension (MM) 540*120*405

8

2-2. External pictures (four faces)

Service Manual

Model No.:

Front Side

Left Side

9

Service Manual

Model No.:

Right Side

10

Back Side

Chapter 3. Disassemble and Assemble

Service Manual

Model No.:

3-1. Remove the Stand

1. Lay down the unit so that back cover faces
upward.

picture 1

1. Remove the 2 and 3 screws indicated in
picture 1.

2.Uncover the equipment, the FFC wire and

LVDS wire are shown below(See picture 3).
Remove the FFC wire and LVDS wire from
the panel.

2. Remove the 1 screw from the back cover
which are indicated with the number in the
picture above.

3-2. Remove the Back Cover

picture 3

3. Then remove the back cover from the unit.

(See picture 4).

picture 4

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12

3-3. Remove the Main Board &
Small Board

There are four boards in the machine:
A:Remote Control Board;B:Main Board;C:LED
Driver Board ;D:Keypad Board (See picture 5).

picture 7

3-3-3. Remove the Keypad Board

There's no screw in this board,pull the keypad
board out from Front Cabinet directly.

picture 5

3-3-1. Remove the Mainboard and the
Driver Board

Remove the six screws indicated in picture 6.
Take out the mainboard and the drive board.

picture 8

3-3-4. Remove the Speakers

Remove the two screws indicated in picture 9
Take out one speaker,then another as this.

picture 6

3-3-2.Remove the Remote Control Board

Remove the screw indicated in picture 7.
Take out the mainboard and the drive board.

picture 8

Service Manual

Model No.:

Chapter 4. Location of Controls and Components

4-1. Board Location

No. Parts number Description

A Borad 0090720951B Remote Control Board

B Borad DZZz0XF0E0400 Main Board
C Borad 0090722687 LED Driver Board
D Borad 0090722685 Keypad Board

4-2. Main Board

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Model No.:

14

4-2-1. Function Description:

Main Board

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

4-2-2. Connector denition

Main board connector

CNE1 CNE2

Pin number Signal name Pin number Signal name

1

+5V

1

GND

2 IR 2 KEY1
3 RED 3 KEY2
4 GREEN
5 GND

CNB1(No use) CNB2(No use)

Pin number Signal name Pin number Signal name

1

GND

1

+5V

2 TXD 2 GND
3 RXD 3 SCL
4 +5V 4 SDA

CON1 CNC1

Pin number Signal name Pin number Signal name

1

PS_ON

1

L_N

2 GND 2 L_P
3 GND 3 R_N
4 ADJ 4 R_P
5 ON/OFF
6 +12V
7 +12V

Notes:

CNE1:Remote Control connector ; to A Board
CNE2:Keypad connector ; to D Board
CNB1:Sensitization connector
CNB2:Upgrade connector
CON1:Driver connector ; to C Board
CNC1:Speaker connector ; to Speaker
CND3:LVDS connector ; to Panel

CND3

Pin number Signal name

1

RXO0-

2 RXO0+
3 RXO1-
4 RXO1+
5 RXO2-
6 RXO2+
7 GND
8 RXOC-

9 RXOC+
10 RXO3-
11 RXO3+
12 RXE0-
13 RXE0+
14 GND
15 RXE1-
16 RXE1+
17 GND
18 RXE2-
19 RXE2+
20 RXEC-
21 RXEC+
22 RXE3-
23 RXE3+
24 GND
25 NC
26 NC
27 NC
28 VCC
29 VCC
30 VCC

4-3. Driver Board

Service Manual

Model No.:

15

4-4. Remote Control Board

Connector denition:

CN1 Signal name

1 PS_ON
2 GND

3 GND
4 ADJ
5 ON/OFF
6 +12V
7 +12V

Function description:To supply power for Panel.

4-5. LED Panel

Connector denition:

CN1 Signal name

1 +5V
2 IR

3 RED
4 GREEN
5 GND

Fu nction descrip tion:receive r emote control
signal

Connector denition:

see next page

Function description:Display program

Service Manual

Model No.:

16

Pin number Signal name Description

1 RXO0- minus signal of odd channel 0(LVDS)

2 RXO0+ plus signal of odd channel 0(LVDS)

3 RXO1- minus signal of odd channel 1(LVDS)

4 RXO1+ plus signal of odd channel 1(LVDS)

5 RXO2- minus signal of odd channel 2(LVDS)

6 RXO2+ plus signal of odd channel 2(LVDS)

7 GND GND

8 RXOC- minus signal of odd clock channel (LVDS)

9 RXOC+ plus signal of odd clock channel (LVDS)

10 RXO3- minus signal of odd channel 3(LVDS)

11 RXO3+ plus signal of odd channel 3(LVDS)

12 RXE0- minus signal of even channel 0(LVDS)

13 RXE0+ plus signal of even channel 0(LVDS)

14 GND GND

15 RXE1- minus signal of even channel 1(LVDS)

16 RXE1+ plus signal of even channel 1(LVDS)

17 GND GND

18 RXE2- minus signal of even channel 2(LVDS)

19 RXE2+ plus signal of even channel 2(LVDS)

20 RXEC- minus sig n a l of even clock ch a n n e l

21 RXEC+ plus signal of even clock channel (LVDS)

22 RXE3- minus signal of even channel 3(LVDS)

23 RXE3+ plus signal of even channel 3(LVDS)

24 GND GND

25 NC NC

26 NC Test pin (Can’t connect to GND)

27 NC NC

28 VCC Power supply input voltage(5.0 V)

29 VCC Power supply input voltage(5.0 V)

30 VCC Power supply input voltage(5.0 V)