Haier HT-3718 Manual de usuario

HT-3718

Service Manual

COLOUR TELEVISION

Precautions.................................1

Specifications..............................5

Alignment and Adjustments.........7

SchematicDiagrams...................56

BolckDiagram.............................55

ElectricalParts List.....................41

Exploded Views and PartsList....40

Troubleshooting...........................34

Features

I C bus control

Turning TV on/off with curtain-fashion

218 programmes stored

Entire channel CATV(470MHZ)

Multi-picture and multi-volume modes selection

Audio/Video input and output,S-Video terminal

Black background protection without signal

On-time,off-time,appointing programme

English OSD

Childlock

Haier group

1.PRECAUTIONS

INPORTANT SAFETY NOTICE

These parts are identified by many electrical and mechanical parts in this chassis have special

safety-related characteristics. ！in the Schematic Diagram and Replacement Parts List.

It is essential that these special safety parts should be replaced with the same components as

recommterminaled in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.

Do not modify the original design without permission of the manufacturer.

General Guidance

An Isolation Transformer should always be used during the servicing of a receiver whose

chassis is not isolated from the AC power line. Use a transformer of adequate power rating as

this protects the technician from accidents that might result in personal injury caused by

electrical shocks.

It will also protect the receiver and it’s components from being damaged by accidental shorts

of the circuitry that might be inadvertently introduced during the service operation.

If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it with a specified one.

When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1W), keep the

resistor 10mm away from PCB.

Keep wires away from high voltage or high temperature parts.

Due to the high vacuum and large surface area of the picture tube, extreme care should be

taken in handling the Picture Tube. Do not lift the Picture Tube by its Neck.

X-RAY Radiation

Warning:

The source of X-RAY RADIATION in this TV receiver is the High Voltage Section and the

Picture Tube.

For continued X-RAY RADIATION protection, the replacement tube must be of the same

type as specified in the Replacement Parts List.

Before returning the receiver to the customer,

always perform an AC leakage current check on the exposed metallic parts of the cabinet,

such as antennas, terminals, etc., to make sure that the set is safe to operate without any

danger of electrical shock.

SERVICEING PRECAUTIONS

CAUTION: Before servicing receivers covered by this service manual and its supplements

and addterminala, read and follow the SAFETY PRECAUTIONS.

NOTE: If unforeseen circumstances create conflict between the following servicing

precautions and any of the safety precautions, always follow the safety precautions.

Remember: Safety First.

General Servicing Precautions

1. Always unplug the receiverAC power cord from the AC power source before:

a. Removing or reinstalling any component, circuit board module or any other assembly of

the receiver.

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 substitution part or incorrect installation polarity of electrolytic

capacitors may result in an explosion hazard.

d. Discharging the picture tube anode.

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. Discharge the picture tube anode only by (a) first connecting one terminal of an insulated

clip lead to the degaussing or kine aquadag grounding system shield at the point where the

picture tube socket ground lead is connected, and then (b) touch the other terminal of the

insulated clip lead to the picture tube anode button, using an insulating handle to avoid

personal contact with high voltage.

4. Do not spray chemicals on or near this receiver or any of its assemblies.

5. 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 nonabrasive applicator; 10% (by volume) Acetone and 90% (by volume)

isopropyl alcohol (90%-99% strength)

CAUTION: This is a flammable mixture.

Unless specified otherwise in this service manual, lubrication of contacts is not required.

6. Do not defeat any plug / socket B+ voltage interlocks with which receivers covered by

this service manual might be equipped.

7. 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.

8. 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.

9. Use with this receiver only the test fixtures specified in this service manual.

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

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such

components are usually 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 incidence of

component damage caused by static electricity.

1. Immediately before handling any semiconductor component or semiconductor- equipped

assembly, drain off any electrostatic charge on your body by touching a known ground ground.

Alternatively, obtain and wear a commercially available discharging wrist strap device, which

should be removed to prevent potential shock 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 folder removal device. Some solder removal devices not

classified as “anti-static” can generate electrical charges sufficient to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient 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: Be sure no power is applied to the chassis or circuit, and observe all other safety

precautions.

8. Minimize bodily motions when handling unpackaged replacement ES devices. (Otherwise

even some normally harmless motions such as mutual brushing of your clothes’ fabric or

lifting of your foot from a carpeted floor might generate static electricity sufficient to damage

an ES device.)

General Soldering Guidelines

1. Use a grounded-tip, low-wattage soldering iron and appropriate tip size and shape that will

maintain tip temperature within the range of 500oF to 600oF.

2. Use an appropriate gauge of RMA resin-core solder composed of 60 parts tin/40 parts lead.

3. Keep the soldering iron tip clean and well tinned.

4. Thoroughly clean the surfaces to be soldered. Use a mall wire bristle (0.5 inch, or 1.25cm)

brush with a metal handle. Do not use freon-propelled spay-on cleaners.

5. Use the following unsoldering technique

a. Allow the soldering iron tip to reach normal temperature.(500o F to 600o F)

b. Heating the component lead until the solder melts.

c. Quickly draw the melted solder with an anti-static, suction-type solder removal device

with solder braid.

CAUTION: Work quickly to avoid overheating the circuit board printed foil.

6. Use the following unsoldering technique

a. Allow the soldering iron tip to reach normal temperature.(500o F to 600o F )

b. First, hold the soldering iron tip and solder the strand against the component lead until the

solder melts.

2. TECHNICAL SPECIFICATION

1. PWER SUPPLY AC 90v-250v 50/60Hz

2. COLOUT SYSTEM: PAL SECAM NTSC4.43/3.58 (AV)

3.TV SYSTEM: B/GD/K

4.CRT: 14”

5. AERIAL INPUT IMPEDANCE: 75ΩStandard Coaxial Cable

6. SOUND OUTPUT POWER: ≥1W

7. POWER CONSUMPTION: ≤60W

8.NETWEIGHT(kg): 11

9. NET SIZE (mm): 440 x 355 x 335

Products functions

TYPE

FUNCTIONS

HT-3718

TYPE

FUNCTIONS

HT-3718

IC TA1238 Audio output power(w) 1W

Tube 14 Super woofer

Color system PAL SECAM

NTSC3.58/4.43(A V) NO of built-in speakers 2

Broadcast system B/G D/K Analog surround stereo

No.of preset channels 218 Treble/bass lifting and balancing

CATV band width 470MHZ Multiple audio mode

Blue/black screen black AV stereo

Menu OSD Digital reverberation

OSD language English Tone control

Manifold PIC modes Auto volume leveling

Program preview Mute

Y/C separation circuit 3D surround sound

Denoise circuit SRS

Black level extend MAX volume preset

Blue level extend 5 bands equalizer

Auto skin color correction

AUDIO

NICAM

adjustment AV in Rear 1

Dynamic high voltage stabilizing AV out Rear 1

Dynamic focusing S terminal

Double focusing DVD signal input

Dynamic white peak clipping KARAOK terminal

Color resolution lift Stereo headphone socket

4 2 2 PIC window positioning VGA

Pull-curtain type on /off display NO. of Australian standard sockets

Artificial intelligence Service terminal

SVM HI-FI audio signal output terminal

CTI External super bass terminal

LTI

TERMINA

DC current output

Video signal digitalization Timer off(MINS) 120

Teletext Timer on

Still frame Auto off upon no signal

Multi PIC Frames AC off

PIP independent tuner Stand by

PIP double tuner Frequency synthesis tuning

PIC out PIC Tension synthesis tuning

9 programs preview Automatic color system identify

100Hz I2C bus-mastering

ZOOM AV in AV out

Stepless zoom in/out Wireless earphone(infrared)

16 9 mode Handset position notify(beep)

Logo configure Automatic channel preset

Skip Partial automatic channel preset

Supper receiver

CONTROL

Manual channel preset

Calendar Total power input(W) 60W

Memo book/games Voltage range(V) AC150V-250V

Favorite channels Power frequency(Hz) 50HZ

Child lock Packaged weight(Kg) 12Kg

SPECIFICA

TIONS

Packaged dimensions(mm) 500*415*390

Type of power plug

OTHER V-CHIP CCD

Attention: already have * you can choose it or not

3.Alignment and Adjustments

Functions:

•I 2C bus control

•Display Full Function on Screen and infrared Remote Control

•ASM System and fine Circuit, 100 Programs stored from 0 to 99

•Picture mode stored (don’t Adjust Brightness repeatedly)

•Audio/Video input and output, S-video terminal

•Twelve kinds of modes Turning OFF the TV set with defined time (120 minutes. 110

minutes. 100 minutes… 30 minutes, 20 minutes, 10 minutes)

•Blue Background and Sound Mute without Signal, Turn Off without signal after 15 minutes.

•Entire Channel TV (CATV 470 MHz)

•English

Control

A. Local control buttons

HT-3718 HT3728

①Power switch button

②Infrared sensor window

③Power indicator

④Program up/down button

⑤Volume up/down button

⑥TV/AV alternating button

⑦Menu display button

⑧Audio (R) input

⑨Audio (L) input

⑩Video input

CONNECTING TO OTHER EQUIPMENT

The sockets son the back cover

①Aerial socket

②Video input socket

③Video output socket

④Audio input socket

⑤Audio output socket

⑥S- video socket

⑦Audio output (L) socket

⑧Audio output (R) socket

Connecting to AV input sockets on the back cover

connect the video and audio outputs of a VCR OR VCD player etc. To AV input sockets of

this TV set. Tapes and discs can be played.

Connecting to the AV output sockets:

The AV output terminals can put out the picture and sound signal that the TV set played. They

are used to record TV program.

•Connect the audio output (L) or the audio output ® on the TV set to the audio input on the

mono VCR.

•When you receive S-Video video signal, you must remove video signal;

Wen you receive video signal, you must remove S-Video signal.

When you receive AV input signal, you can only select either the front AV input signal or the

back AV input signal.

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