Teac LEDV2282FHD User manual

5. Troubleshooting and Schematic Diagrams for DVD Module
4. Schematic Diagrams
10. BOM List
3. Troubleshooting

MODEL:
CONTENTS
1. Precautions
2. Block Diagram
6. Exploded Views
7. Adjustment
8. Key Parts
9. Product Specifications
LEDV2282FHD

1.PRECAUTIONS
Prior to shipment from the factory,the products are strictly inspected to conform with recognized product safety and
Electrical codes of the countries in which they are to be sold.However, in order to maintain such compliance,it is
equally important to implement the following precautions when a set is being serviced.
1-1.Safety Precautions
1) Before returning an instrument to the customer, always
make a safety check of the entire instrument, including, but
not limited to, the following items:
(1) Be sure that no built-in protective devices are defective
or have been defeated during servicing.
(1) Protective shields are provided to protect both the
technician and the customer. Correctly replace all
missing protective shields, including any remove for
servicing convenience.
(2) When reinstalling the chassis and/or other
assembly in the cabinet, be sure to put back in place
all protective devices, including, but not limited to,
nonmetallic control knobs, insulating fish papers,
adjustment and compartment covers/shields, and
isolation resistor/capacitor networks. Do not operate
this instrument or permit it to be operated without all
protective devices correctly installed and functioning.
(2) Be sure that there are no cabinet opening through which
adults or children might be able to insert their fingers
and contact a hazardous voltage. Such openings
include, but are not limited to, excessively wide
cabinet ventilation slots, and an improperly fitted
and/or incorrectly secured cabinet back cover.
(3) Leakage Current Hot Check-With the instrument
completely reassembled, plug the AC line cord
directly into a 120V AC outlet. (Do not use an
isolation transformer during this test.) Use a leakage
current tester or a metering system that complies with
American National Standards institute (ANSI) C101.1
Leakage.
Current for Appliances and underwriters Laboratories
(UL) 1270 (40.7). With the instrument’s AC switch
first in the ON position and then in the OFF position,
measure from a known earth ground (metal water pipe,
conduit, etc.) to all exposed metal parts of the
instrument (antennas, handle brackets, metal cabinets,
screwheads, metallic overlays, control shafts, etc.),
especially and exposed metal parts that offer an
electrical return path to the chassis.
Any current measured must not exceed 0.5mA.
Reverse the instrument power cord plug in the outlet
and repeat the test.
AC Leakage Test
Any measurements not within the limits specified
herein indicate a potential shock hazard that must be
eliminated before returning the instrument to the
customer.
(4) Insulation Resistance Test Cold Check-(1) Unplug the
power supply cord and connect a jumper wore
between the two prongs of the plug. (2) Turn on the
power switch of the instrument. (3) Measure the
resistance with an ohmmeter between the jumpered
AC plug and all exposed metallic cabinet parts on the
instrument, such as screwheads, antenna, control
shafts, handle brackets, etc. When an exposed
metallic part has a return path to the chassis, the
reading should be between 1 and 5.2 megohm. When
there is no return path to the chassis, the reading must
be infinite. If the reading is not within the limits
specified, there is the possibility of a shock hazard,
and the instrument must be re-pared and rechecked
before it is returned to the customer.

Insulation Resistance Test
2) Read and comply with all caution and safety related
notes non or inside the cabinet, or on the chassis.
3) Design Alteration Warning-Do not alter of add to the
mechanical or electrical design of this instrument.
Design alterations and additions, including but not
limited to, circuit modifications and the addition of
items such as auxiliary audio output connections,
might alter the safety characteristics of this instrument
and create a hazard to the user. Any design alterations
or additions will make you, the service, responsible
for personal injury or property damage resulting there
from.
4) Observe original lead dress. Take extra care to assure
correct lead dress in the following areas:
(1) near sharp edges, (2) near thermally hot parts (be
sure that leads and components do not touch
thermally hot parts), (3) the AC supply, (4) high
voltage, and (5) antenna wiring. Always inspect in all
areas for pinched, out-of-place, or frayed wiring. Do
not change spacing between a component and the
printed-circuit board, Check the AC power cord for
damage.
5) Components, parts, and/or wiring that appear to have
overheated or that are otherwise damaged should be
replaced with components, parts and/or wiring that
meet original specifications. Additionally determine
the cause of overheating and/or damage and, if
necessary, take corrective action to remove and
potential safety hazard.
6) Product Safety Notice-Some electrical and mechanical
parts have special safety-related characteristics which
are often not evident from visual inspection, nor can
the protection they give necessarily be obtained by
replacing them with components rated for higher
voltage, wattage, etc. Parts that have special safety
characteristics are identified by shading, an ( ) or a
() on schematics and parts lists. Use of a substitute
replacement that does not have the same safety
characteristics as the recommended replacement part
might created shock, fire and/or other hazards.
Product safety is under review continuously and new
instructions are issued whenever appropriate.
1-2 Servicing Precautions
CAUTION: Before servicing Instruments covered by this
service manual and its supplements, read and follow the
Safety Precautions section of this manual.
Note: If unforeseen circument create conflict between the
following servicing precautions and any of the safety
precautions, always follow the safety precautions.
Remember; Safety First
1-2-1 General Serving Precautions
(1) a. Always unplug the instrument’s AC power cord from
the AC power source before (1) removing or
reinstalling any component, circuit board, module or
any other instrument assembly. (2) disconnecting
any instrument electrical plug or other electrical
connection. (3) connecting a test substitute in
parallel with an electrolytic capacitor in the
instrument.
b. Do not defeat any plug/socket B+ voltage interlocks
with which instruments covered by this service
manual might be equipped.
c. 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.
d. Always connect a test instrument’s ground lead to
the instrument chassis ground before connecting the
test instrument positive lead. Always remove the test
instrument ground lead last.
Note: Refer to the Safety Precautions section ground
lead last.
(2) The service precautions are indicated or printed on the
cabinet, chassis or components. When servicing,
follow the printed or indicated service precautions
and service materials.
(3) The components used in the unit have a specified flame
resistance and dielectric strength.
When replacing components, use components which

have the same ratings, by ( ) or by ( ) in the
circuit diagram are important for safety or for the
characteristics of the unit. Always replace them with
the exact replacement components.
(4) An insulation tube or tape is sometimes used and some
components are raised above the printed wiring board
for safety. The internal wiring is sometimes clamped
to prevent contact with heating components. Install
such elements as they were.
(5) After servicing, always check that the removed screws,
components, and wiring have been installed correctly
and that the portion around the serviced part has not
been damaged and so on. Further, check the insulation
between the blades of the attachment plus and
accessible conductive parts.
1-2-2 Insulation Checking Procedure
Disconnect the attachment plug from the AC outlet and
turn the power ON. Connect the insulation resistance meter
(500V) to the blades of the attachment plug. The insulation
resistance between each blade of the attachment plug and
accessible conductive parts (see note) should be more than
1 Megohm.
Note: Accessible conductive parts include metal panels,
input terminals, earphone jacks, etc.

1. When installing the LED module in the LED cover,be
handling the LED module:
Precautions for handling the LED module
1-4. Handling the LED Module
In case the screen is damaged and the internal liquid
leaks,do not suck or drink the internal fuid. Nor do you
touch it either ,otherwise you might be poisoned or get a
rash with your skin,If the internal fluid enters your
mouth,rinse with water.If itadheres to your skin or
clothes,wipe it away with alcohol and then wash with water.
If it enters your eyes,wash with running water immediately.
The LED module can be easily damaged during assembly
or disassembly.Observe the following precautions when
sure to seat it so that it is properly aligned and
maximum visibility of the display is maintained.
2. If the panel’s surface gets dirty,wipe it with cotton or a
soft cloth.If it is still dirty,try breathing on the surface
to create a light condensate and wipe it again.If the
surface is very dirty,we recommend a CRT cleaning
agent.Apply the agent to a cloth and then wipe the
panel’s surface .Do not apply cleanser directly to the
panel .Also,neverscratch the suface.
3. If water or other liquid is left on the panel’s surface for
a long period,it can change the screen’s tint or stain it.
Be sure to quickly wipe off any liquid.
4. Glass is used in the panel ,so be careful not to drop it
or let it strike a hard object ,which could cause
breakage or cracks.
5. CMOS-LSI circuits are used in the module,so guard
against damage from electrostatic discharge.Be sure to
wear aa wrist or ankle ground when handling the
module.
6. Do not expose the module to direct sunlight or strong
ultraviolet rays for long periods.
7. Do not store the module a temperatures below
specifications.Cold can cause the liquid crystals to
freeze,lose their elasticity or otherwise suffer damage.

8. Do not disassemble the LED module.Disassembly can
cause malfunctions.
9. If you transport the module,do not use packing
material that contains epoxy resin(amine)or silicom
glue(alcohol or oxime).These materials can release gas
that can damage the panel’s polarization.

2.Block Diagram
1) Mainboard˖Control all input signals, Decode the video signal, De-interlace, and send digital
signals (LVDS signal) to panel.
2) Panel˖Display all image;
3) IR Board : Receive IR Signal;
4) Keyboard POWERǃSOURCEǃMENUǃVOL+/- ,Channel +/-;
5) Adapter: 110V-240V AC IN,Ouput 12V DC to the mainboard
6) Inverter Board: the power supply for backlight of panel.
7) DVD Module: built-in DVD player with slot-in loader.
Panel Display
Mainboard
Inverter Board
IR BoardKeyboard
LVDS Cable M/B
to Panel
Adapter Input(DC12V)
DVD
Module

3.Troubleshooting
Power Units Problem Solving
Display Units Problem Solving
Audio Units Problem Solving
Functional Units Problem Solving
CV306L-A
Common Problem Solving

Picture
Picture 1
1
Power Units Problem Solving
Power Units Problem Solving
In stand-by mode, Check TP1 have 12V?
Check the +5V and +3.3V test-point of main
board whether the voltage is correct or not
Power on the
machine
Check LDO IC U1; U4 、U10 、
U3 、Q1、Q2 burned or over
load short-circuit
test-point TP3 have 5V?
test-point TP2 have 12V?
test-point TP11 have
1.8V? ， test-point TP9
have 3.3V? test-point TP12
have 2.5V，test-point TP6
have 1.32V？
YN
OK
Check the power
network of U1,U21
NY
NY
Check their
external circuit

Change driver board cable
Y
N
Change LCD
N
Y
Y
Check the LVDS output pins,
see whether there is
short-circuit or unconnected pin
Change this part of the circuit
N
Is VCC-Panel
correct？Check
Q10，J2
Does the software
match the panel?
Upgrade software
N
Y
Picture 2 Display
Units
Units
（
Flickering
Flickering ）
Flickering or
Black screen（Back light on）
Is the connection of Driver Board Cable normal
Is LCD normal
Check the network output
driver board J3 socket normal

Black screen
Does #5#6 pin of main
board J9 have 12V?
Check +12v power supply for Inverter,
does J9 #4 pin have control voltage?
Check/repair power supply
N
NY
Y
Check the PB-ON/OFF network Inverter damaged
or bad connection
Picture 3 Display Unit
(black screen)

NO sound
Any audio signal input or
Is amplifier power supply normal
Check audio
equipment:
power amplifier
circuit
Check U20（TPA1517）#1/9
pin whether or not normal
NY
Y
N
Check Q24,Q25
external circuit
Volume, MUTE set
Whether or not normal
Reset
check CON12 any
signal output
YN
Examine
external
Speaker
Check power
Circuit of Q1,
if power supply
is normal,
change Q1
Check Q25,Q24 #3 pin
Whether there is a signal output
N
Y
N
Check the network
connects U20 and
Q24,Q25
Picture 4 Audio Unit (NO sound)
Y

Picture 5 Function Unit
(ATV broke down)
N
Check
external
RF
equipment
Y
Dose U7
work
normal
and
it’s
network
Y N
Check I2C
data
network’s
connection
to
U13(MSD306P
T) #A6,W6 pin
NY
N
Check the
network of
MSD306P
T #y3,aa3
pin
Y
Does Tuner have any signal output?
N
Y
Change
Tuner
Does power supply of
U7
NY
Check
circuit of
MSB1210、
Crystal
Oscillator
and SAW
filter U14
Check
the
power
supply
network
TV not searching/no image
External RF input signal
Whether or not normal
Check tuner VCC whether has 5V
Check Tuner’s I2C data
Check U14 #4pin whether has signal or not

N Y
Picture 6 Function Unit
(TV no sound)
Check tuner U14 #3 pin whether has signal or not
N
Check U13
(MSD306PT) and their
filter network
Y
Check U13 and U14 whether has
input audio signal or not
NY
Check
MSB121
0 and the
circuit
concerne
d
Check the
Audio SAW
filter U15
and the
circuit
concerned
ATV no sound only picture
Under PC AV whether or not has sound
See “NO SOUND”
repair guide

N Y
Dose U7
work
normal
and
it’s
network
Y N
Check I2C data
network’s
connection
to
U13(MSD306P
T) #Y6,W6 pin
N
Y
Does U14 have TS signal output?
N
Check
U13(MSD3
06PT)
signal
network
concerned
Y
Change
Tuner
Does U13
have TS
signal output
Check
external
circuit
N
Y
Picture 7 Function Unit
(DTV broke down)
TV not searching/no image
External RF input signal
Whether or not normal
Check
external
RF
equipment
Check tuner VCC whether has 5V
Check Tuner’s I2C data

PC port
Image vibrating No signal
Use
automatic
adjustment
Is U13(MSD306PT) RGB
input signal normal
System setting
not correct,
reset system
Y N
VS,HS signal whether is
normal and stable
Check VS.HS
circuit
OSD setting does
not march. Reset
system. Or input
not support
Check VS.HS
circuit
Y N
Check the VGA
socket Whether
touch normal
with cable
Check VGA
input circuit
Picture 8 Function Unit
（PC）
Image not at center Lose color,
color cast
Check the VGA
socket Whether
touch normal
with cable

SCART 、AV、S-VIDEO port
SCARGT
Lose color,
color cast All no signal
System setting
not correct,
reset system
Check CON11SCART
RGB input network
Does software work?
Is U13（MSD306PT）RGB
Input signal normal?
Y N
Does SCART
socket
touch normal?
Is AV,S-VIDEO
Input signal normal?
Change
external
signal source
N
Y
Check the connection network
between U13 and the input
port whether correct or not
Check U13and it’s
external circuit
N Y
Check and repair
the concerned
Input network
Picture 9 Function Unit
（SCART、AV、S-V）

HDMI
No image Has image
but no sound
See “power supply problem
repair guide Check the
HDMI input
network
Check HDMI and its
input network, check
U26 whether it’s
EDID data is correct
Check U13
（MSD306PT ）HDMI
network whether
normal or not
N
Under pc mode whether
has sound or not
Y N
See “NO
SOUND”
repair guide
Y
Picture 10 Function Unit
（HDMI）
Check the HDMI
socket Whether
touch normal
with cable

Does machine show
“CI MODULE INSERTED”
when CI card inserts PCMCIA
Enter Menu, then
CI information can be read
Check VCC-PCMCIA
power supply，
Check Q8 whether work
normal or not
OK
Y N
Y N
Y N
Change CI card,
Check external
network
Change Q8
Change CI card
OK Check external
network
NY
Picture 11 Function Unit
（PCMCIA CI）