Parker TLU248HB Schematic

LCD

TLU248HB

CONTENT

7cm

PARTS LIST

MODEL PART NUMBER DESCRIPTION SPECIFICATIONPHOTO

Caution.................................................................................................2

Technical Specifications.......................................................................6

Circuit Diagram...................................................................................14

Exploded View....................................................................................26

Parts List ............................................................................................30

Note: This manual is the latest at the time of printing,and does not
include the modification which may be made after the printing, by the
constant improvement of product.

TLU248HB

PK-TLU-248-RM-HB

PK-TLU-248-MB-HB

PK-TLU-248-PW-HB POWER BOARD LS2402003 VER1.0

PK-TLU-248-KEYB-HB

PK-TLU-248-TCW-HB

PK-TLU-248-SPK-HB

PK-TLU-248-RCB-HB

4cm

REMOTE CONTROL REMOTE CONTROL

MAIN BOARD

KEYBOARD

T.COM, WIRE

(LVDS)27PIN

SPEAKER

4 X 7 cm

RECEIVER BOARD

CLAA215FA01

MT8223.2A

T15.022011-00R

T.COM, WIRE (LVDS)27PIN

4Ώ / 5W

T15.035011-02R

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The lightning flash with arrowhead symbol, within an equi-

lateral triangle, is intended to

alert the user to the presence of uninsulated “dangerous
voltage” within the product’s enclo sure that may be of
sufficient magnitude to constitute a risk of electric shock to
persons.

The exclamation point within an equilateral triangle is
intended to alert the user to the presence of important
operating and maintenance (servicing) instructions in the
literature accompanying the appliance.

PRECAUTIONS DURING SERVICING

1. In addition to safety, other parts and assemblies are specified for
conformance with such regulations as those applying to spurious
radiation. These must also be replaced only with specified replace­ments.
Examples: RF converters, tuner units, antenna selection switches,
RF cables, noise-blocking capacitors, noise-blocking filters, etc.

2. Use specified internal Wiring. Note especially:

1) Wires covered with PVC tubing

2) Double insulated wires

3) High voltage leads

3. Use specified insulating materials for hazardous live parts. Note
especially:

1) Insulating Tape

2) PVC tubing

3) Spacers (insulating barriers)

4) Insulating sheets for transistors

5) Plastic screws for fixing micro switches

4. When replacing AC primary side components(transformers, power

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cords, noise blocking capacitors, etc.), wrap ends of wires securely
about the terminals before soldering.

5. Make sure that wires do not contact heat generating parts (heat
sinks, oxide metal film resistors, fusible resistors, etc.)

6. Check if replaced wires do not contact sharply edged or pointed
parts.

7. Make sure that foreign objects (screws, solder droplets, etc.) do not
remain inside the set.

MAKE YOUR CONTRIBUTION TO PROTECT THE ENVI­RONMENT

Used batteries with the ISO symbol

for recycling as well as small accumulators(rechargeable batteries),
mini-batteries (cells) and starter batteries should not be thrown into the
garbage can.
Please leave them at an appropriate depot.

WARNING:

Before servicing this TV receiver, read the SAFETY INSTRUCTION
and PRODUCT AFETY NOTICE.

SAFETY INSTRUCTION

The service should not be attempted by anyone unfamiliar with the
necessary instructions on this apparatus. The following are the neces­sary instructions to be observed before servicing.

1. An isolation transformer should be connected in the power line
between the receiver and the AC line when a service is performed
on the primary of the converter transformer of the set.

2. Comply with all caution and safety related provided on the back of
the cabinet, inside the cabinet, on the chassis or LCD panel.

3. When replacing a MAIN PCB in the cabinet,always be certain that
all protective are installed properly such as control
knobs,adjustment covers or shields, barriers, isolation resistor
networks etc.

4. When servicing is required, observe the original lead dressing. Extra
precaution should be given to assure correct lead dressing in the
high voltage area.

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5. Keep wires away from high voltage or high tempera ture compo­nents.

6. Before returning the set to the customer,always perform an AC
leakage current check on the exposed metallic parts of the
cabinet,such as antennas, terminals,screwheads, metal overlay,
control shafts, etc., to be sure the set is safe to operate without
danger of electrical shock. Plug the AC line cord directly to the AC
outlet (do not use a line isolation transformer during this check). Use
an AC voltmeter having 5K ohms volt sensitivity or more in the
following manner.
Connect a 1.5K ohm 10 watt resistor paralleled by a 0.15μF AC type
capacitor, between a good earth ground (water pipe, conductor
etc.,)and the exposed metallic parts, one at a time.Measure the AC
voltage across the combination of the 1.5K ohm resistor and 0.15
uF capacitor. Reverse the AC plug at the AC outlet and repeat the
AC voltage measurements for each exposed metallic part.The mea­sured voltage must not exceed 0.3V RMS.
This corresponds to 0.5mA AC. Any value exceeding this limit
constitutes a potential shock hazard and must be corrected immedi­ately.
The resistance measurement should be done between accessible
exposed metal parts and power cord plug prongs with the power
switch "ON". The resistance should be more than 6M ohms.

TLU248HB

PRODU

CT S AFETY NOTICE
Many electrical and mechanical parts in this apparatus have special
safety-related characteristics.
These characteristics are offer passed unnoticed by visual spection
and the protection afforded by them cannot necessarily be obtained by
using replacement components rates for a higher voltage, wattage, etc.
The replacement parts which have these special safety characteristics

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3

CIRCUIT(SCH)

are identified by marks on the schematic diagram and on the parts
list.
Before replacing any of these components,read the parts list in this
manual carefully.
The use of substitute replacement parts which do not have the same
safety characteristics as specified in the parts list may create shock,

fire, or other hazards.
Must be sure that the ground wire of the AC inlet is connected with the
ground of the apparatus properly.

TLU248HB E xploded View D raw ing

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TECHNICAL SPECIFICATIONS

FEATURES

• Image Resolution: 1366 x 768 (HD)

• Brightness: 300cd/m2

• USB Port compatible with MP3 audio and JPG photos

• Dynamic Contrast Ratio: 30,000:1

• Viewing Angle: 170° / 170°

• Response Time: 5 ms

• TV System: NTSC / PAL M / PAL N

• Audio Power: 5W x 2

• MTS Stereo / SAP

• HDMI Input (1)

• Power: 100-240V 50/60Hz

Net Weight: 4.5 Kg
Dimensions: 531 x 353 x 73 mm

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3

CIRCUIT(SCH)

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3

CIRCUIT(SCH)

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3

CIRCUIT(SCH)

SERVICE

Lcd tv trouble shooting
NOTICE:Before repair the board,make sure the software is correct or
upgrade the correct software.
Warning:If upgrade fail,such as power off during upgrading,the flash
rom must be replaced.Power Supply Trouble

Remote control unit

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CIRCUIT DIAGRAM

1 BLOCK DIAGRAM

2. circuit(SCH)

1. BLOCK DIAGRAM

PCB failure analysis

1. CONTROL:
a. Abnormal noise on screen.
b. No picture.

2. MAIN (VIDEO):
a. Lacking color, Bad color scale.
b. No voice.
c. No picture but with signals output, OSD and back light.
d. Abnormal noise on screen.3. POWER:
No picture, no power output.

Basic operation of LCD-TV

1. After turning on power switch, power board sends 5Vst-by Volt to
Micro Processor IC waiting for ON signals from Key Switch or Remote
Receiver.

2. When the ON signal from Key Switch or Remote Receiver is
detected, Micro Processor will send ON Control signals to Power. Then
Power sends (5V,3.3V,1.8V and Vs ON) to PCBs working. This time
inverter will send signals to display back light,OSD on the panel and
start to search available signal sources.If the audio signals input, them
will be amplified by Audio AMP and transmitted to Speakers.

3. If some abnormal signals are detected (for example: over volts, over
current,over temperature and under volts), the system will be shut down
by Power off.

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Basic Operat ions & C ircuit D esc ription
Main Elec tric C omponent s
(1).MODULE:
There is 1 pcs panel.

(2).SIGNAL PROCESS
There are PCB including:
1 pcs Main board,
1 pcs Keypad board,
1 pcs Remote Control Receiver board

(3).POWER & Inverter board
There is 1 pcs PCB inverter.
There is 1 pcs 12V/3A DC adapter.

PCB Function

1.Power:
Convert the low DC voltage +12V to high AC voltage to drive the back­light.

Circuit(SCH)

Double click to view it.

3

CIRCUIT(SCH)

2.Main(Video InterFace) board:
(1).Convert TV RF signal to video and audio signal
(2).Convert the audio to audio amplify and output to the speaker.
(3).Decode the video signal(TV,CVBS,S-VIDEO)from analog to digital
signal.
Convert the Video signals(TV,CVBS,S-VIDEO) and graphics
signal(HDMI VGA, YPbPr) from internace to progressive.
(4).Convert the Digital to fit the panel display mode and output of the
LVDS signal to panel.

3. KEY board
To get the main button control on LCD TV as
SOURCE,MENU,CHANNEL+,CHANNEL-, VOL+,VOL-, STANDBY
functions.

4. Remote Control board
Receive the remote signal and active for the control.

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