AWA MHV3902Y-O3 User manual
SERVICE MANUAL
LED TV
Model No.
MHV3902Y-O3
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.
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.
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
....................................................................................
Service Manual
Model No.:
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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
11
12
15
15
4-2 Remove the Back Cover 15
4-3 Remove the Adhesive Tape 15
4-4 Remove the Terminal Bracket 16
4-5 Remove the Power Module 16
4-6 Remove the Main Board 16
4-7 Remove the Speaker 17
4-8 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
8-1. How to enter into the factory model
8-2. How to update software
7-2. Circuit Diagram
7-3. Wiring Connection Diagram
26
27
42
35
43
8. Measurements and Adjustments........…………............................ 39
Service Manual
Model No.:
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9. Trouble-shooting………….............................................................. 44
9-1. Simple Check 44
9-2. Main Board Failure Check
9-3. Panel Failure
45
52
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 rain or excessive moisture. This TV must not be exposed to dripping or splashing water,
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.
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
Service Manual
Model No.:
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1-3-6 Safety Check after Repairment
- 04 -
Service Manual
Model No.:
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.
CAUTION: eiver.
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:
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.:
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Electrostatically Sensitive (ES) Devices
1-3-7. Ordering Spare Parts
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.
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
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
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
- 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:
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/
Service Manual
Model No.:
- 07 -
Screen Size 39inch
Aspect Ratio 16:9
Resolution 1920x1080
Response Time (ms) 6.5 (GRAY TO
GRAY)
Angel of View
Color Display 16.7M
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) 8W×2
Audio Output Power
(outer) (W) No
Total Power Input (W) 70W
Voltage Range (V) AC100V-240V
Power Frequency (Hz) 50~60Hz
Net Weight (KG) 8.5
Gross Weight (KG) 12.7
Net Dimension (MM) 906.3*554.5*75
Packaged Dimension
(MM) 906.3*599*250
Model MHV3902Y-O3
178 (H)/178 (V)
- 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
Service Manual
Model No.:
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3-2-1 Function Description:
Main Board
Process signal which incept from exterior equipment then translate into signal that panel
can display.
Main board connector
Power connectors (J2,J25)
J2
Pin number Signal name
1 GND
3 BK ON /OFF
4 +5V
5 POWER ON/OFF
6 +5VSTB
7 +5V
8 +5V
9 GND
10 GND
11 GND
12 +12V
Notes:
J2-Pin 3: Backlight on/off:
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
J25
Pin number Signal name
1
2
3
4
5
+5V
BL ON/OFF
BL-ADJUST
+5V
GND
2GND
- 10 -
Service Manual
Model No.:
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Keypad andremote connector (J28)
8
9
0
STANDBY
Speaker connectorJ26
Pin number Signal name Description
1 RSPK+ RSPK+
2 RSPK- RSPK-
3 LSPK- LSPK-
4 LSPK+ LSPK+
3-3. Power Board
3-3-1 Function Description:
Supply power for Main board, Panel.
Service Manual
Model No.:
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CON1
Pin number Signal name
1
GND
2
3
4
+5V
5
POWER ON/OFF
6
+5VSTB
7
+5V
8
+5V
9
GND
10
GND
11
GND
12
+12V
CON2
Pin number Signal name
1
2
3
4
5
6
7
8
+24V
+24V
+24V
+24V
GND
GND
GND
GND
13
+12V
NC
NC
3-4. LED Panel
- 12 -
Service Manual
Model No.:
MTC390BLU-C01F(T390HVN01)
Service Manual
Model No.:
- 13 -
CNF1 Connector Pin Assi nment
PIN
Symbol Description PIN
Symbol Description
1
N.C. AUO Internal Use Only 26
N.C. AUO Internal Use Only
2
N.C.
AUO Internal Use Only 27
N.C.
AUO Internal Use Only
3
N.C. AUO Internal Use Only 28
CH2_0- LVDS Channel 2, Signal 0-
4
N.C.
AUO Internal Use Only 29
CH2_0+ LVDS Channel 2, Signal 0+
5
N.C.
AUO Internal Use Only 30
CH2_1- LVDS Channel 2, Signal 1-
6
N.C. AUO Internal Use Only 31
CH2_1+ LVDS Channel 2, Signal 1+
7
LVDS_SEL
Open/High(3.3V) for NS,
Low(GND) for JEIDA 32
CH2_2- LVDS Channel 2, Signal 2-
8
N.C. No connection 33
CH2_2+ LVDS Channel 2, Signal 2+
9
N.C. No connection 34
GND Ground
10
N.C. No connection 35
CH2_CLK-
LVDS Channel 2, Clock -
11
GND Ground 36
CH2_CLK+
LVDS Channel 2, Clock +
12
CH1_0- LVDS Channel 1, Signal 0- 37
GND Ground
13
CH1_0+ LVDS Channel 1, Signal 0+ 38
CH2_3- LVDS Channel 2, Signal 3-
14
CH1_1- LVDS Channel 1, Signal 1- 39
CH2_3+ LVDS Channel 2, Signal 3+
15
CH1_1+ LVDS Channel 1, Signal 1+ 40
CH2_4- LVDS Channel 2, Signal 4-
16
CH1_2- LVDS Channel 1, Signal 2- 41
CH2_4+ LVDS Channel 2, Signal 4+
17
CH1_2+ LVDS Channel 1, Signal 2+ 42
N.C. AUO Internal Use Only
18
GND Ground 43
N.C. No connection
19
CH1_CLK-
LVDS Channel 1, Clock - 44
GND Ground
20
CH1_CLK+
LVDS Channel 1, Clock + 45
GND Ground
21
GND Ground 46
GND Ground
22
CH1_3- LVDS Channel 1, Signal 3- 47
N.C. No connection
23
CH1_3+ LVDS Channel 1, Signal 3+ 48
V
DD
Power Supply, +12V DC Regulated
24
CH1_4- LVDS Channel 1, Signal 4- 49
V
DD
Power Supply, +12V DC Regulated
25
CH1_4+ LVDS Channel 1, Signal 4+ 50
V
DD
Power Supply, +12V DC Regulated
51
V
DD
Power Supply, +12V DC Regulated
Note: N.C. : please leave this pin unoccupied. It can not be connected by any signal
(Low/GND/High).
4. Disassemble and assemble
faces upward
4-2Remove the Back Cover
unit.
Service Manual
Model No.:
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4-1 Remove the Pedestal
4-3 Remove the main board
4-4 Remove the power module
Service Manual
Model No.:
- 16 -
J20 J15
4-7 Remove the speaker
Take out the speaker
4-8 Remove the remote control
take out the remote control board
Service Manual
Model No.:
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5. Installation Instructions
5-1 External Equipment Connections
Accessories
Remote Control User GUIDE Battery
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.
To improve picture quality from an antenna in a poor signal area, install a signal
If you need to split the antenna signal to connect two TVs, install a two-way splitter.
Service Manual
Model No.:
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Service Manual
Model No.:
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AV EQUIPMENT
W R
GBR
Yellow (video)
White(audio L)
Red(audio R or Pr)
Y
W
R
Blue(Pb)
Green(Y)
B
G
VIDEO EQUIPMENT with YPbPr
WR
GBR
W R
HDMI
TO AUDIO OUTPUTS
TO VIDEO
OUTPUT HDMI
W
R
WR
TO AUDIO INPUTS
TO VIDEO
INPUTS
You can use the input and output terminals on the TV set as follows.
Your TV can be connected to the following appliances: VCR, multi disc player, DVD, camcorder,
video game or stereo system, etc.....
YPbPr can support these video formats: 480i,576i,480p,576p,720p,1080i.
Use an HDMI connection to support 1080p operation.
(component video)
Y
Y
Y
VIDEO EQUIPMENT
WR
Y
VIDEO EQUIPMENT
WR
WR
TO AUDIO OUTPUTS
VIDEO EQUIPMENT
TO VIDEO
OUTPUT
Y
Y
Service Manual
Model No.:
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PRESET MODE
STEPS:
PC
Be sure boththe TV and computer are
set to Poweroff.
1.Connect a VGAand audio cable.
2.Connect the powercord.
3.Power on theTV, switch to PC mode.
4.Power on thePC.
This connection andpower-up sequence
is very important.
VGA and audiocable
not supplied
1
2
3
4
5
6
7
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
RESOLUTION V.Freq.(Hz) H.Freq.(kHz)
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