AWA MHDV2245-O3-D0 Service Manual

SER

VICE MANUAL

LED TV

Model No.

Chassis

MSD306

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.
P

roducts 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.

W

ARNING

MHDV2245-O3-D0

1-1. T

able 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

2. Specifications....................................................................................

Service Manual

Model No.:

- 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

6

88

8
8

1

1

12

15

15
4-2 Remove the Back Cover 15
4-3 Remove the Adhesive Tape 15

4-4 Remove the Power Module 16
4-5 Remove the Main Board 16

4-6 Remove the Speaker 17
4-7 Remove the Remote Control Board 17

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

18

5-1 External Equipment Connections 18
5-2 HDMI Connections 21

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

24

6-1 Front Panel Controls
6-2 Back Panel Controls
6-3 Universal Remote Control

24

24

25

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

26

7

-1. Block Diagram
7-2. Circuit Diagram
7-3. Wiring Connection Diagram

26
27
35

Service Manual

Model No.:

- 02 -

10. T

rouble-shooting…………..............................................................

50

10

-1. Simple Check 50

10-2. Main Board Failure Check
10-3. Panel Failure

51
58

9. D

VD OPERATION…………..............................................................

45

9-2. D

VD Trouble Shooting

49

8-1. How to enter into the factory model
8-2. How to update software

42
43

8. Measurements and

Adjustments........…………............................

39

8-2. How to enter into the hotel model

44

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

To prevent damage which might result in electric shock or re, do not expose this TV set

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

and objects lled with liquid, such as vases, must not be placed on top of or above the TV.

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.

1-3-5. Use the genewing parts (specied 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 identied by mark have special characteristics important for safety.

Service Manual

Model No.:

- 03 -

1-3-6 Safety Check after Repairment

- 04 -

Service Manual

Model No.:

Conrm 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

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.

8. Use with this receiver only the test xtures specied in this service manual.

CAUTION: Do not connect the test xture ground strap to any heat sink in this receiver.

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 ammable mixture.

Unless specied otherwise in this service manual, lubrication of contacts is not required.

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

Service Manual

Model No.:

- 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.

5. Do not use freon-propelled chemicals. These can generate electrical charges sufcient

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

classied as "anti-static" can generate electrical charges sufcient to damage ES devices.

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

lifting of your foot from a carpeted oor can generate static electricity sufcient to damage

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

You can nd them in the Spare Parts List

- 06 -

Service Manual

Model No.:

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:

Icons are used to attract the attention of the reader to specic 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 nd additional information on a specic topic.

Service Manual

Model No.:

- 07 -

2. Specifications

Model

MHDV2245-O3-D0

Screen Size 21.5inch
Aspect Ratio 16:9
Resolution

Response

Time (ms)

5 (GRAY TO
GRAY)

Angel of View
Color Display
No. of Preset Channels 400
OSD Language English
Color System PAL/SECAM
Audio System DK, BG, I, M, L, L'

Audio Output Power
(Built-in) (W)

3W×2

Audio Output Power
(outer) (W)

No

Total Power Input (W) 22.8W
Voltage Range (V) DC 12V
Power Frequency (Hz) 50~60Hz

Net Weight (KG)
Gross Weight (KG)

5.2
Net Dimension (MM) 535*165*390
Packaged Dimension

(MM)

610*92*440

3.9

- 08 -

Service Manual

Model No.:

3. Location of Controls and Components

3-1 Board Location

No. Description

A

Board Main Board

B Board Power Board

3-2 Main Board

A

Board

B Board

515C3206M01

514C2415M01

LVDS WIRE

30433920301

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Model No.:

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3-2-1 Function Description:

Main Board

P

rocess signal which incept from exterior equipment then translate into signal that panel

can display.

3-2-2 Connector denition

Main board connector

Power connectors (J2)

J2

Pin number Signal name
1 GND
2 ADJ
3 BK ON /OFF
4 +5V
5 POWER ON/OFF
6 +5VSTB

7 +5V
8 +5V
9 GND
10 GND
1

1 GND

12 +12V

Notes:

J2-Pin 3: Backlight on/of

f:
The system can turn on or turn off the backlight of TFT LED Panel through the power
supply unit path.
J2-Pin 5: System power on / standby
System board will use this pin to control system power.
J2-Pin 2: Control the luminance of backlight
The system can generate the PWN signal to control the strength of TFT LED Panel’s
backlight through this connector

13 +12V

- 10 -

Service Manual

Model No.:

Keypad andremote connector (J28)

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

KEY1

KEY0

GND

7

8

9

10

NC

STANDBY

Speaker connectorJ26

Pin number Signal name Description
1 RSPK+ RSPK+
2 RSPK- RSPK­3 LSPK- LSPK­4 LSPK+ LSPK+

3-3. Power Board

3-3-1 Function Description:

Supply power for Main board, Panel.

3-3-2Connectordefinition

Service Manual

Model No.:

- 1

1 -

CN2

Pin number Signal name
1

GND

2

ADJ

3

BK ON /OFF

4

+5V

5

POWER ON/OFF

6

+5VSTB

7

+5V

8

+5V

9

GND

10

GND

1

1

GND

12

+12V

Pin number Signal name

CN1

1

2
3

4

+12V

+12V

GND

GND

13

+12V

3-4. LED Panel

- 12 -

Service Manual

Model No.:

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

3-4-2 Connector de finition.

CLAA215FA04 V4

PIN NO.

REMARK FUNCTION

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

Service Manual

Model No.:

- 13 -

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)

1

1 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 signal of even clock channel (LVDS)

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)

1) Keep the NC Pin and don’

t connect it to GND or other signals.

2) GND Pin must connect to the ground, don’t let it be a vacant pin.

4. Disassemble and assemble

Remove the adhesive tape indicated on the

gure above

① Lay down the unit so that rear cover

faces upward

① Remove the one screw from the
rear cover indicated with ○

①

Then remove the pedestal

4-2Remove the Back Cover

①

Remove the these screw indicated on

gure above by ○

①

Then remove the back cover from the

unit.

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Model No.:

- 15 -

4-1 Remove the Pedestal

4-3. Remove the adhesive tape

①

Remove the two screw indicated on

the gure above by ○

① Then put the terminal bracket to the side

4-4 Remove the power module

①

Then remove the power module

① Disconnected the coupler J20①J2①

①J28① ①J26①

① Remove the Main board

Service Manual

Model No.:

- 16 -

CON2

J10 J11

①

4-5 Remove the Main board

4-7 Remove the speaker

T

ake out the speaker

4-8 Remove the remote control

Remove

the screw, take out the remote control

Service Manual

Model No.:

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5. Installation Instructions

5-1 External Equipment Connections

Accessories

Remote Control

User GUIDE

Battery

Antenna Connection
C

onnect one end of a coaxial cable (not included) to the ANT IN jack on the back of
your TV/DVD combo, then connect the other end of the cable into the antenna or cable
TV wall outlet.

T

o improve picture quality from an antenna in a poor signal area, install a signal

amplier.

If you need to split the antenna signal to connect two TVs, install a two-way splitter.

Service Manual

Model No.:

- 18 -

Service Manual

Model No.:

- 19 -

INSTALLATION