AWA MHDV2262-04 Schematic

SERVICE MANUAL

LED TV

Model No.

MSD306

MHDV2262-04

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 pr
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

oduct.

or death.

Service Manual

Model No.:

Chapter 1: General Information

1-1. Table of Contents

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

1-1. Table of Contents

1-2. General Guidelines
1-3. Important Notice
1-4. How to Read this Service Manual

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

3-1. Board Location

3-2. Main Board & AV Board

3-3. LCD Panel

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

4-1 Remove the Pedestal

4-2 Remove the Back Cover 12

4-3 Remove the Adhesive Tape 12

4-4 Remove the Main Board 13

10

12

12

1

1
3
3
6

6

8

8

8

8

4-5 Remove the Speaker 13

4-6 Remove the Remote Control Board 14

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

5-1 External Equipment Connections 15

5-2 HDMI Connections 18

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

6-1 Front Panel Controls

6-2 Back Panel Controls

6-3 Universal Remote Control

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

7-1. Circuit Diagram

7-2. Wiring Connection Diagram

15

21

21

21

22

23

23

33

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Service Manual

Model No.:

8. Measurements and Adjustments

8-1. How to enter into the factory model

8-2. How to update software
8-3. How to enter into the Hotel Model

........…………............................

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

9-1. Simple Check 46

9-2. Main Board Failure Check

9-3. Panel Failure

35

43

44
45

46

47

57

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Service Manual

Model No.:

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

Service Manual

Model No.:

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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.

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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".

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.

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.

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9. Remove the antenna terminal on TV and turn on the TV.

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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

- 04 -

Service Manual

Model No.:

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 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.

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

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

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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).

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:

safety precautions.

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.)

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

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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 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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- 05 -

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.

Service Manual

Model No.:

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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- 06 -

Service Manual

Model No.:

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Model MHDV2262-04

Screen Size 21.5 inch

Aspect Ratio 16:9

Resolution 1920x1080

Response Time (ms)

5.0 (GRAY TO

GRAY)

Angel of View

160(H)/160(V)

Color Display 16.7M

No. of Preset Channels 1000

OSD Language English

Color System PAL/SECAM

Audio System

DK, BG, I, M, L, L'

Audio Output Power

3W×2

(Built-in) (W)

Audio Output Power

No

(outer) (W)

Total Power Input (W) 38W

Voltage Range (V)

Power Frequency (Hz)

AC 100-240V

50~60Hz

Net Weight (KG)

Gross Weight (KG)

Net Dimension (MM)

Packaged Dimension

(MM)

- 07 -

3.8

4.9

528*38*350

528*145*390

3. Location of Controls and Components

3-1 Board Location

Service Manual

Model No.:

B

A Board

No. Description

A Board Integration Mainboard

B

LVDS WIRE

3-2 Main Board

515C3212M21
4031C226209

- 08 -

Service Manual

Model No.:

3-2-1 Function Description:

Main Board

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

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Main board connector

Keypad and remote connector (J28)

Pin number Signal name Description
1
2 LED_G
3
4
5
6

7

8

9

10

LED_R

STANDBY

IR REMOTE CONTROL

GND

5V

NC

KEY0
KEY1

GND

LAMP RED
LAMP GREEN

GND

POWER FOR REMOTE

Speaker connector (J26)

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

- 09 -

3-3. LED Panel

Service Manual

Model No.:

CLAA215FA10

- 10 -

Service Manual

Model No.:

3-4-1.Connector de finition

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
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 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.

- 11 -

Service Manual

Model No.:

4. Disassemble and assemble

4-1 Remove the Pedestal

4-2Remove the Back Cover

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faces upward

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4-3. Remove the adhesive tape

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unit.

Remove the adhesive tape indicated on the

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- 12 -

4-4 Remove the Main board

Service Manual

Model No.:

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J28



J26

J20

CN804

4-5 Remove the speaker

CN800

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CN805

CN806

- 13 -



Take out the speaker

Service Manual

Model No.:

4-6 Remove the remote control

take out the remote control

board

- 14 -

5. Installation Instructions

5-1 External Equipment Connections

Accessories

Service Manual

Model No.:

Remote Control

Antenna Connection
Connect 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.

User GUIDE

Battery

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

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

- 15 -

AV EQUIPMENT

You can use the input and output terminals on the TV set as follows.

- OR - N.B. Only one HDMI input can
be selected at a time.

HDMI

VIDEO EQUIPMENT with YPbPr output (Component video output)

INSTALLATION

G

B

Y

Yellow (Composite video)

W

White (audio L)

R

Red (audio R or Pr)

B

Blue (Pb)

G

Green (Y)

VIDEO EQUIPMENT (Composite video output)

VIDEO EQUIPMENT

W R

TO AUDIO OUTPUTS

Y

TO VIDEO
OUTPUT

R

W

R

Audio

G

VIDEO

R

W

YPbPr

RL

W R

R

B

Component video

AV OU T PUT

L

R

Y

W R

VIDEO

Y

TO VIDEO
INPUTS

VIDEO EQUIPMENT

W

Y

TO AUDIO INPUTS

R

Your TV can be connected to the following appliances: VCR, multi disc player, DVD, camcorder,

video game console or stereo system, etc.....

YPbPr (component video) can support these video formats: 480i, 576i, 480p, 576p, 720p.
Use an HDMI connection to view 1080i/1080p material.

- 16 -

INSTALLATION

REAR AV Connections

YPbPr

RL

VIDEO

R

AV OUT P UT

L

VIDEO

All the terminals are (from left to right):

AC POWER INPUT, AV composite video

, (composite video and L+R audio).

input AV output

YPbPr (component video) inputs, L+R Audio inputs,

Note: 1. VIDEO and YPbPr share the same L+R audio inputs.

2. The AV output sockets are only functional during DVD operation.

SIDE AV Connections

All the terminals are (from left to right):
USB, HDMI2 input, HDMI1 input, HEADPHONE output, PC Audio input, VGA input,

Antenna socket.

Note: 1. When the HDMI1 input receives a DVI signal, the matching audio signal is received

by the PC Audio input.

2. When the HDMI2 port receives a DVI signal, the matching audio signal is received
by the YPbPr/AV Audio input.

ANTENNA

Plug (not supplied)

Note:
Aerial connections: IEC (PAL-type, female).
Input impedance: 75 unbalanced.

POWER

AC Input

100-240V~ 50/60Hz

Outdoor antenna (not supplied)

For optimum digital TV reception,
the use of high quality shielded 75
coax cable is recommended.

- 17 -

PC

STEPS:

Be sure both the TV and computer are set to Power off.

1.Connect a VGA and audio cable.

2.Connect the power cord.

3.Power on the TV, switch to PC mode.

4.Power on the PC.
This connection and power-up sequence is very
important.

PRESET MODE

VGA and audio cable

not supplied

INSTALLATION

RESOLUTION V.Freq.(Hz) H.Freq.(kHz)

1

2

3

4

5

6

7

The above resolutions are the only ones guaranteed to be supported. Other resolutions up to
1920 x 1080 may also be supported, but this must be assessed by the user on a case-by-case
basis. This is also subject to the limitiations of the computer’s video card.

720*400

640*480

800*600

800*600

800*600

1024*768

1024*768

70

60

56

60

72

60

70

31.47

31.47

35.156

37.88

48.08

48.36

56.48

- 18 -

Service Manual

Model No.:

5-2 HDMI Connections

When the source device(DVD player or Set Top Box) supports HDM
How To Connect

1. Connect the source device to HDMI port of this TV with an HDMI cable(not supplied
with this product).

2. No separated audio connection is necessary.

How To Use

If the source device supports Auto HDMI function, the output resolution of the source
device will be automatically
set to 1280x720p.
If the source device does not support Auto HDMI, you need to set the output resolution
appropriately.
To get the best picture quality, adjust the output resolution of the source device to
1280x720p.
Select HDMI input source in input source option of Select Main source menu.

When the source device(DVD player or Set Top Box) supports DVI
How To Connect

1. Connect the source device to HDMI port of this TV with a HDMI-to-DVI cable(not
supplied with this product).

2. A separated audio connection is necessary.

3. If the source device has an analog audio output connector, connect the source device
audio output to DVI Audio In port located on the PC port.

How To Use

If the source device supports Auto DVI function, the output resolution of the source device
will be automatically
set to 1280x720p.
If the source device does not support Auto DVI, you need to set the output resolution
appropriately.
To get the best picture quality, adjust the output resolution of the source device to
1280x720p.
Press the INPUT button to select HDMI input source in input source option of Select Main
source menu.
Installation

- 18 -