NO:M-LA-EC-2199-76812 -Edition: 2002.12.30

HTX21S31 COLOR TELEVISION

Service Manual

Haier

Features PAL M/N, NTSC M

Front Audio/Video input V-CHIP, CCD 181 Channel

Haier Group

MODEL: HTX21S31

1

CONTENTS

1 Contents--------------------------------------------------------------------1

2 Product Code illumination and Series Introduction--------------------2

3 Features--------------------------------------------------------------------------------3

4 Safety Precautions------------------------------------------------------------------4

5 Warning and Cautions-------------------------------------------------------------5

6 Net dimension----------------------------------------------------------------------11

7 Parts and Functions--------------------------------------------------------------12

8 Remote Controller Functions--------------------------------------------------13

9 Program Diagram------------------------------------------------------------------14

10 Maintenance Service and Trouble shooting------------------------------15

11 Circuit Diagram---------------------------------------------------------------------18

12 Circuit Explanation----------------------------------------------------------------22

13 Adjustment---------------------------------------------------------------------------24

14 Exploded View----------------------------------------------------------------------27

15 List of Parts--------------------------------------------------------------------------28

16 Damageable Parts List-----------------------------------------------------------41

17 Information of Resistors and Capacitors----------------------------------41

CONTENTS

2

2.Product Code illumination and Series Introduction

H T X 21 S31

Haier

Toshiba

CRT size (unit: inch)

Color television appearance

Product Code illumination and Series Introduction

3

3.Features MODEL HTX21S31

MODEL HTX21S31NO. ITEM FUNCTION

NO. ITEM FUNCTION

1 Main IC 76814 24 Digital curtain 2 CRT Flat square 25 Slow fading on & off 3 Color system NTSC 26 Semitransparent menu 4 Audio system M 27 Non-flashing channel changing 5 Number of channels 181 28 ZOOM 6 OSD language E F S P 29 16:9 mode 7

PICTURE

Multi-picture modes 30 Games 8 AV stereo 31 Calendar 9 Super woofer 32 Child-lock 10 Surrounding sound 33 Multi-functional lock 11 Treble/bass boost 34 No-picture listening 12 Left/right balancer 35 Background light 13 NICAM 36 Auto-timer on 14 Multi-audio modes 37 CCD 15 Tone adjuster 38

SOFTWARE

V-CHIP 16 MTS/SAP 39 Number of built-in speakers 2 17

AUDIO

Auto-volume leveling 40 Audio output power (W) 2 18 AV input Front 1 41 Total power input W 70

19 AV output 42 Voltage range V 90VAC-250V

AC 20 DVD terminal 43 Power frequency Hz 60 21 S-video jack 44 Time of sleep timer (MINS) 120 22 Headphone socket 45 Net weight (KG) 23.5 23

JACK

SCART socket 46 Gross weight (KG) 25

47 Net dimension (MM) 610X475X46

5

48 Packaged dimension (MM) 685X545X52

0 49 Quantity for 20' container

50 Quantity for 40' container

51

PARAMETER

Quantity for 40' high container

Features

4

4. Safety Precautions

SAFETY PRECAUTIONS IMPORTANT SAFETY NOTICE Many electrical identify these parts 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 recommended 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.

Safety Precautions

5

5.Warning and Cautions

CAUTION: Before servicing receivers covered by this service manual and its supplements and addenda, read and follow the SAFETY PRECAUTIONS.

1. When you clean the TV set, please pull out the power plug from AC outlet. Don't clean the cabinet and the screen with benzene, petrol and other chemicals.

4. To prevent the TV set from firing and electric shock, don'tmake the TV set rain or moisture.

2. In order to prolong the using life of the TV set, please place it on a ventilated place.

5. Don't open the back cover, otherwise it is possible to damage the components in the TV set and harm you.

3. Don't place the TV set in the sunshine or near heat source.

6. When the TV set isn't going to be used for long time or it is in thunder and lightening, please pull out the plug from AC outlet and the antenna plug from the cover of the TV set.

Explanation on the display tube

Generally, it is not needed to clean the tube surface. However, if necessary,its surface can be cleaned with a dry cotton cloth after cutting off the power.Don't use any cleanser. If using hard cloth, the tube surface will be damaged.

Warning and Cautions

6

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 receiver AC 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 end 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 end 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 sprays 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.

Electrostatic ally Sensitive (ES) Devices

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

Warning and Cautions

7

components are usually called Electrostatic ally 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 earth 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 500 oF to 600 oF.

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. (500 o 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.

Warning and Cautions

8

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

1) Use the following unsoldering technique

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

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

c. Quickly move the soldering iron tip to the junction of the component lead and the printed circuit foil, and hold it there only until the solder flows onto and around both the component lead and the foil.

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

d. Closely inspect the solder area and remove any excess or splashed solder with a small wire-bristle brush.

Remove /Replacement

Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent flat against the circuit foil. When holes are of slotted type, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined.

Removal

Desolder and straighten each IC lead in one operation by gently prying up on the lead with the soldering iron tip as the solder melts.

Draw away the melted solder with an anti-static suction-type solder removal device (or with solder braid) before removing the IC.

Replacement

Carefully insert the replacement IC in the circuit board.

Carefully bend each IC lead against the circuit foil pad and solder it.

Clean the soldered areas with a small wire-bristle brush. (It is not necessary to reapply acrylic coating to the areas).

“Small-Signal” Discrete Transistor Removal/Replacement

Remove the defective transistor by clipping its leads as close as possible to the component body.

Bend into a “U” shape the end of each of three leads remaining on the circuit board.

Bend into a “U” shape the replacement transistor leads.

Connect the replacement transistor leads to the corresponding leads extending from the circuit board and crimp the “U” with long nose pliers to insure metal to metal contact then solder each connection.

Power Output, Transistor Device Removal/Replacement

Heat and remove all solder from around the transistor leads.

Warning and Cautions

9

Remove the heat sink mounting screw (if so equipped).

Carefully remove the transistor from the heat sink of the circuit board.

Insert new transistor in the circuit board.

Solder each transistor lead, and clip off excess lead.

Replace heat sink.

Diode Removal/Replacement

Remove defective diode by clipping its leads as close as possible to diode body.

Bend the two remaining leads perpendicularly to the circuit board.

Observing diode polarity, wrap each lead of the new diode round the corresponding lead on the circuit board.

Securely crimp each connection and solder it.

Inspect (on the circuit board copper side) the solder joints of the two “original” leads. If they are not shiny, reheat them and if necessary, apply additional solder.

Fuse and Conventional Resistor Removal/Replacement

1) Clip each fuse or resistor lead at top of the circuit board hollow stake.

2) Securely crimp the leads of replacement component around notch at stake top.

3) Solder the connections

CAUTION: Maintain original spacing between the replaced component and adjacent components and the circuit board to prevent excessive component temperatures.

Circuit Board Foil Repair

Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive that bonds foil to the circuit board causing the foil to separate from or “lift-off” the board. The following guidelines and procedures should be followed whenever this condition is encountered.

At IC Connections

To repair a defective copper pattern at IC connections use the following procedure to install a jumper wire on the copper pattern side of the circuit board. (Use this technique only on IC connections).

1) Carefully remove the damaged copper pattern with a sharp knife. (Remove only as much copper as absolutely necessary).

2) Carefully scratch away the solder resist and acrylic coating (if used) from the end of the remaining copper pattern.

3) Bend a small “U” in one end of a small gauge jumper wire and carefully crimp it around the IC pin. Solder the IC connection.

4) Route the jumper wire along the path of the out-away copper pattern and let it overlap the previously scraped end of the good copper pattern. Solder the overlapped area and clip off any excess jumper wire.

Warning and Cautions

10

At other connections

Use the following technique to repair the defective copper pattern at connections other than IC Pins. This technique involves the installation of a jumper wire on the component side of the circuit board.

1) Remove the defective copper pattern with a sharp knife.

Remove at least 1/4 inch of copper, to insure that a hazardous condition will not exist if the jumper wire opens.

2) Trace along the copper pattern from both sides of the pattern break and locate the nearest component that is directly connected to the affected copper pattern.

3) Connect insulated 20-gauge jumper wire from the lead of the nearest component on one side of the pattern break to the lead of the nearest component on the other side.

Carefully crimp and solder the connections.

CAUTION: Be sure the insulated jumper wire is dressed so that it does not touch components or sharp edges.

Warning and Cautions

11

6.Net dimension

Haier

Net dimension

12

7.Parts and Functions

HTX21S31 TV1.Fro nt Pa ne l

TV/AV MENU P

8

9

10

1 . C a b le TV A n te n n a H o o ku p

TV Rear Panel1

ANT

1 1

Picture Tube

AV

Left Speaker

TV/AV alteration buttonMenu buttonVolume up/down buttonChannel up/down button

input

Front

11.Right speaker

Audio (R) input Power indicatorPower switch

Parts and Functions

13

8.Remote Controller Functions

1. P ow er B utton2. Tim e & C hannel D isplay B utton3. R ating B utton T V P rogram (V -C hip S etup)4. Last C hannel R ecall B utton5. V olum e(+/-) S elect B utton6. P ersonal P reference S elect7. C hannel(+/-) S elect B utton

8. M enu S elect B utton9. A udio S elect B utton10.D irect A ccess C hannel S elect11. T V /AV Input B utton12. M ute B utton13. S leep Tim er14.S Y S T E M selection

1 2 3

654

7 8 9

0

M EN U RECALL

RATING

C H +

V O L+

C H -

SO UN D

P.S TD

1

2

3

4

5

6

7

8

9

TV/AV D ISP

S Y S

Remote Controller Functions

14

9. Program Diagram

Insert the power plug into the power line socket and insert the antenna plug into the antenna socket on the rear panel. Press down the power switch of the TV set. The red indicator light goes on.

Program preset

A 1). Auto searching and storing program

Press MENU button on the remote controller to call up the “PREST” menu on the screen. Use the “ ” key to select the bar “auto search” then press the “ ” to make sure. If you want to stop, press the key “ ”.

2). Deleting channel number

Press channel up/down buttons to select a channel to skip. Press MENU to call up the “PREST” menu on the screen. Then Press the” “item to select the bar “Add/Delete” then use the “ ” key to select Add or Delete.

B Volume tuning

Press VOLUME buttons VOL- to decrease and VOL+ to increase the volume.

C Personal preference settings

Picture modes

Press P.STD repeatedly to change among Personal, Stadard, Vvivid, Soft to change the Picture Mode.

Program Diagram

15

10.Maintenance service and trouble shooting 1). Adjustment item Explanation:

OSD Explanation Range Remark 0 H.PHASE H.PHASE 0~31 1 NT.H.PHASE H.PHASE 0~31 No used 2 H.BLK.LEFT 0~7 3 H.BLK.RIGHT 0~7 4 V.SIZE Vertical Size 0~127 5 V.LINE Vertical Linearity 0~31 6 V.POSI Vertical DC 0~63 7 V.SC Vertical S-Correction 0~31 8 NT.V.SIZE Vertical Size -32~+31 9 NT.V.LINE Vertical Linearity -16~+15 10 NT.V.POSI Vertical DC -32~+31 11 NT.V.SC Vertical S-Correction -16~+15 12 RF.AGC RF AGC Delay 0~63 13 VOL.OUT Volume Control 0~127 14 OSD H.POSI 0~127 15 OSD V.POSI 0~31 16 INPUT LEVEL 0~15 17 SPECTRAL 0~63 (0~31)PHILIP IC 18 WIDEBAND 0~63 (0~31)PHILIP IC 19 STEREO VCO 0~63 No used 20 FILTER SET 0~63 No used 21 SAP VCO 0~63 No used 2). Setting item explanation:

OSD Function

0 LA76814/LA768

12

0: select LA76814 1:select LA76812

1 SAP IC SELECT 0:TDA9850;1:CXA2104;2:TDA9855;3:UPC1815B

2 SUB.CONT Sub-contrast(0-31)

3 SUB.COLOR Sub-color(0-63)

4 SUB.SHARP Sub-sharpness(0-31)

5 SUB.TINT Sub-tint(0-63)

6 BLK.STR.DEF Black level stretch (0:on; 1:off)

7 AFC GAIN AFC gain (0:low; 1:high)

8 V.SEPUP Vertical synchronize sensitive 0 low;1:high

9 CD.MODE “Count down mode”(LA76814:0/1;LA76812:0-7) 10 DIGITAL OSD Digital OSD setting (0:anlyos 1:digital)

11 OSD CONT. OSD contrast (0-127)/LA76814 (0-3)

12 GRAY MOD Gray mode (0/1)

13 B.GAM.SEL Blue γ select (0-3) 14 RG.GAM.DEF Red green γ define (0/1) 15 FBPBLK.SW FBPBLK.SW (0/1)

16 BRIGHT ABL.TH “Bright.abl.threshold”(0-7) 17 EMG.ABL.DEF “Emg.abl.def”

. Maintenance service and trouble shooting

16

18 BRT.ABL.DEF Brt.Abl.Def (0/1)

19 MID.STP.DEF Mid.Stp.Def (0/1)

20 R—Y/B-Y G.BL R-Y/B-Y Gain Balance (0~15) No use (LA76814)

21 R-Y/B-Y ANG R-Y/B-Y Angle (0~15)

22 C.KILL.OFF C_Kill OFF (0/1)

23 SND.TRAP Sound Trap (0~7)

24 VOL.FIL Volume Filter Defeat

25 VIF.SYS.SW Video IF setting (0 45.75M 1 58.75M) For LA76814

26 VIDEO.LELEVL Video Level (0~7)

27 FM.LEVEL FM Level (0~31)

28 POWER OPT 0 turn TV on twice 1 memory 2或3Turn TV on first

29 POWER FLAG 0 Without OSD power on function 1 With OSD power off function

30 SEARCH CHECK 1 With auto-programmed function turning TV on.

31 SEARCH SPEED 0 Slow search speed 1 Fast search speed

32 AV OPTION 0 without AV 1 one AV input 2 two AV input 3 Three AV input

33 POSITION L/R 0 Logo display on left top of screen

1 Logo display on right top of

screen

34 BLUE BACK 0 No blue background without signal 1 Blue background without

signal

35 BLACK BACK 0 No background changing channel 1 Background changing channel

36 STEREO OPTION 0 No stereo 1 Stereo

37 WOOF/H.PHONE No used No used 38 WOOF VOL.OPT No used No used 39 SENSITIVITY No used No used 40 V.MUTE P.OFF 0 Before POWER OFF, don’t cut off

video input

1 Before POWER OFF, cut off

video input

41 CCD OPTION 0 No CCD 1 CCD

42 V-CHIP OPTION 0 No V-CHIP 1 V-CHIP

43 PASSWORD OPT. 0 No V-CHIP password 1 V-CHIP password

44 COMB.OPTION 0 NOTHING 1 NOTHING

45 TUNER OPTION 0 TDF-3M3 tuner 1 PHILIP UV1336B tuner

46 GAME OPTION 0 No game 1 Game

47 SCREEN OPTION 0:no curtain effect 1: curtain for on effect 2:curtain for off

effect 3:curtain for on/off effect

.Maintenance service and trouble shooting

17

Check to see if Fuse3 is normal

No lig

Abnormal

Check VD501, C507, V513, etc.

Check to see if the collector voltage of V552

is 0V

Check N101 ect

Check to see if , 12v,

5v is normal

Check the control voltage of V552 or

CPU power

The failure of horizontal unit or

N551 N552

Normal

Normal

Normal Abnormal

Check to see 110V 180V etc. voltage is normal

Test to see all terminal Resistance of load

Is normal

Check power unit

Check to see if rectifying tube

is normal

Change rectifying tube

Check the Loader

Abnormal Normal

Abnormal

Normal Abnormal

Normal Abnormal

Maintenance Service and Trouble shooting

18

11. Circuit Diagram

Circuit Diagram

NO:M-LA-EC-2199-76812 -Edition: 2002.12.30

HR76814 1

NTSC-M PAL-M,N

HT-2199(LA76812)

1 1Tuesday, March 12, 2002

Title

Size Document Number Rev

Date: Sheet of

4

FO

H-PULSE

AC110V

8

9

12

HV

Y

K6D

2

1

13

B1-ADJ

CRT BOARD

4

8

3

5

60HZ

10

C

21

ABL

FO

14SCREEN

11

2

LIVE AREA

3

2

2

8

11

2

10

7 1

1

1

1

1

10

3

3 4

5

9

9

3

4

2

4

2

3

R442

R128X

A101UV1336B

IF

33V

5V

5V

SDA

NC

AGC

SCL

R815X

B412V

R6021/6W10K

C406100V0.068U

R4591W1

C45363V1000

C12363V1000

R1091/6W1K

A701HS0038

R7451/6W220

R7201/6W10K

C70116V47

+

R9072W10K

R9001/6W10K

C93116V10

+

V9322SC1815

C4351.6KV7500

XS401SCN-4Y

L432YC0008

L909LJ0107CHA

C5541KV470

R1051/6W100

C41250V1

+

R8321/6W1K

C805X +

R820X

R8051/6W27K

R7501/6W22K

R8031/6W56K

R2321/6W10K

R4021/6W3.3K

R4541/6W3K

R4081/6W2.2K

R2021/6W1.2K

C11163V0.01U

R7541/6W10K

C71350V1

+

R7031/6W4.7K

C70563V18P

B1110V

K9NTJC2-1A

C91363V56P

R9121/6W100

R4345W3.3K

V4322SD1651

C502AC250V0.1U

C444160V4.7

+

C807X

R809X

XS801-1AUDIO

R270J

R6111/6W3.3K

L441Z0449

R8021/6W100

R2421/6W100

R4581/6W1K

VD4011N4148

C20616V47

+

R1131/6W100K

R7591/6W2.2K

R7381/6W4.7K

R7341/6W10K

B3180V

R9281/2W2.7K

C90163V390

R5026W1

R5512WJ47K

C57210V470

+

C13950V0.47+

B1110V

C20850V0.47

+

C60316V100

+

R7271/6W470

R7211/6W10K

R7241/6W4.7K N451

LA7840

GND1

OUTPUT2

VCC13

NON INPUT4

INPUT5

VCC26

PUMP OUT7

C61625V1000

+

C45235V1000

+

C121100V0.022U

C11063V0.01U

R7641/6W22K

C72063V0.01U

R739X

SW703V+

R9161/6W680

W902 JG0034

R5531/6W4.7K

C561160V220

+

R9331/6W1.5K

R1021/6W100K

L20115UH

B75V

R818X

C80316V10+

V6012SA1015R748

1/6W22K

C40416V220+

R4521/6W1

L45118UH

T101HA6019

C11263V0.01U

V1022SC2216

R7511/6W22K

R7011/6W27K

C70363V0.01U

B612V

R9261/6W680

C90363V56

R4911W2.2

XS402TJC2-5A

W405EU2Z

R8211/6W4.7K

VD412HZ7C1

C532AC400V470

R814X

R8111/6W75

B612V

R4091/6W680

N702BR24C04

VCC8

GND7

SCL6

SDA5

1

2

3

4

C40363V0.47U

C80216V10 +

C40850V1

+

C458100V0.033UR457

1/6W39K

C433500V3900

C27616V10

+

C20450V1

+

C11663V0.01U

R7571/6W22K

R7261/6W270K

R7061/6W1.5K

B55V

C93316V1000

+

U901XXXXXXX

C92163V390

C93450V0.47

+

R5011/2W220K

R5561/6W22K

VD5531N4148

B424V

C10263V0.01U

B9023W16OHM

C60416V100

+

SW707POWER

R5671/6W1.2K

C72963V0.01U

C614X

C24563V0.01U

G2014.43

C11963V0.01U

C10116V100

+

R7621/6W22K

R7431/6W3.3K

R7301/6W10K

SW705MENU

C93216V10

+

V9222SC2688

C4362KV470

C434160V10

+

00 0

L501JLB1606

VD503RM11C

RP5512AL2K

C5031KV1000

R4461/4W220K

R4721W1

R1011/6W33K

R4151/6W3.9K

C808X

XS801-2X

R6041/6W4.7K

C40150V0.47

+

C45450V1

+

R1211/6W1K

R1101/6W220

R7471/6W22K

R7081/6W10K

L70139UH

R9172W10K

V9122SC2688

V9022SC2688

TP-GTEST

C5041KV1000P

VD474EU1

VD472EU1

R2441/6W2.7K

R4121/6W8.2K

C8092200

R813X

VD801X

R120J

R8071/6W220

R7521/6W22K

R7281/6W470

R8041/6W82

C23150V1

R4031/6W330K

R4551/6W12K

R432J

R2711K

R2041/6W560K

L10215UH

R7551/6W22K

R7251/6W330

R7041/6W3.9K

B217V

XP901SCN-4Y

C92363V56P

R9221/6W100

R4411/2W1K

FU501T2.5A250V

VD506RM11C

VD505RM11C

V5542SB892

N701LC86F3248A

NOTHING1

NOTHING2

NOTHING3

NOTHING4

NOTHING5

NOTHING6

POWER7

VT8

GND9

XTAL110

XTAL211

VDD12

KEY IN13

AFT IN14

AGC IN15

NC16

RESET17

FILT18

CVBS-IN19

V SYNC20

H SYNC21

R OUT22

G OUT23

B OUT24

BLANK25

I26

SDA027

SCL028

SDA129

SCL130

SAFTY31

S-VHS32

SD33

IR34

SIF35

NOTHING36

NOTHING37

AV238

AV139

AV/TV40

NOTHING41

NOTHING42

R4741W1

R4716W3.9

C474250V22

+

XP601SCN3-2Y

XS802-1VIDEO

B612V

Z101LBN45U

38M

R6121/6W470

C57010V470

+

R613X

R2431/6W270

C45735V1000

+

C441200V0.33U

C207100V0.01

R1141/6W100K

R7601/6W22K

R7401/6W4.7K

R7291/6W150K

SW701CH+

B612V

C9392KV1000

XS901GZS8-6-4F

XS501TJC2-2A

VD504RM11C

C56525V1000

+

C5512KV470

L442101K

R1271/6W330

R7182W10K

R2051/6W22K

R816X

R2721/6W3K

VD6011N4148

VD701BT205-L

R7221/6W1.5K

B9013W16OHM

R461A1/2W120

R4511/6W5.6K

C12263V0.01U

R1081/6W5.6K

R7651/6W22K

R7441/6W220

R737X

R7091/6W390K

SW704V-

R93215K

R93539

R5541/6W150K

C45016V100

+

R1041/6W100

R2031K

B612V

XS802X

R819XR806

1/6W68K

R7351/6W10K

C40750V1

+

C40563V0.01U

R4531/6W12K

VD451EM01Z

R2011/6W1K

R1111/6W82

R7531/6W22K

R7021/6W8.2K

C70463V15P

B75V

R9401/4W33

R9141/6W330

R9021/6W100

B1110V

XP402TJC2-5Y

R5521/2W100K

C82150V1+

RL551G2R-1A

V802X

R8101/6W75

R808X

C45563V10P

VD9211N4148

VD9111N4148

C431X

C40263V0.22U

XS403SCN-5

R8011/6W22K

R2411/6W100

C45650V4.7

+

T431JDT1904

R2731/4W4.7K-J

C20563V0.01U

C11750V1

+

R7581/6W22K

R7361/6W4.7K

R7311/6W10K

B55V

R9081/2W2.7K

C911

63V390

C432500V1000

U902EW0130KB

R5661/6W10K

C5061KV1000P

C501AC250V0.1U

G70132.768K

B75V

C14063V470

B75V

R2061/6W47K

C611100V0.022U

VD9011N4148

R7071/6W680

L431YC0008

R4001/4W270

C61763V0.01U

R2331/2W1.5K

C45135V100 +

C120100V0.022U

C10316V2.2

+

R7631/6W22K

C71916V47

+

R741X

R7331/4W8.2K

SW706X

R9061/6W560

N551AN7812

123

C5051KV1000

N552AN7805 1 2 3

R1031/6W1K

VD411EU1

C13750V0.47

+

R817X

XS802-2X

R6011/6W10K

R7461/6W22K

R7231/6W8.2K

R4011/6W2.2K

C459100V0.1U

B424V

C12663V39

R1071/6W100

R7491/6W22K

R7001/6W10K

C70263V0.01U

B217V

R9272W10K

R9041/6W330

B1110V

TP-HTEST

B612V

R8221/6W1K

V8212SC1815

R4141/6W10K

W807J

R812X

C124100V0.01

+

C80416V470

+

V8012SC1815

B55V

R1191/6W1K

R7561/6W22K

C80116V10 +

T471

JF0501-19129

R4041/6W1.2K

R4601/2W180

R4561/6W12K

R4331/2W1K

C20316V4.7+

C11516V100

+

R7661/6W1K

C71416V2.2

+

R7051/6W2.7K

B55V

XP902SCN-5Y

R9311/6W1K

R9181/2W2.7K

R9241/6W330

R4131/6W10K

L433ZZ0003R562

RSG-I-FF-125V-750mA

R5551/2W47K

C56425V1000

+C472

35V100

+

C41125V47

+

XS601TJC3-2A

C60116V10

+

V7022SA1015

C61216V10

+

R5611/6W10K

C61325V1000+

C24416V47

+

C11863V0.01U

C70850V4.7

+

R7611/6W22K

R7421/6W3.3K

R7321/6W47K

SW702CH-

N553AN7805

123

R5691/2W 1

RT501PTH451A7R0Q21

000

C533AC400VM2200

R5311/2CK5.6M

R5026W1

R5131M

R5141M V553

2SC1815

C507450V150

+ R5152W68K

C5160.022

VD555ES1

VD551RU3A

VD554EU2Z

L503JLB1606

C5150.022

T511BCK-40-58

VD555ES1

L505YC0008

VD512EG01C

L506YC0008

VD510EU2

R5152W68K

R5118.2

VD511EU2

R510 10K

C513470

V5012SA1015

VD509HZ15C

R50910K

C5111000

R5081/6W4.7K

R5071/6W1.5K

VD508 1N4148

C510470

VD9331N4148

C5541KV470

N501HPC922

R5661/6W10KC518

1KV1000

C5132KV330

N706UPC574

VD703HZ4A2

V7032SC1815

VD507IN4148

R506 680

Z201X4.5

V6032SC1815

V5522SC1815

R5040.1

L504YC0008

V7042SC1815

V4312SC2383-O

V7052SC1815

V9312SA1015

N601LA4225A

INPUT1

NON INPUT2

GND3

OUT4

VCC5

VD4021N4148

V803X

V6022SC1815

VD4521Z75

VD561HZ6C3

C27963V0.01U

C27816V47

+ C277100V0.01

R2711/6W150

N101LA76812

AUDIO OUT1

FM OUT2

PIF AGC3

RF AGC4

VIF IN15

VIF IN26

GND(IF)7

VCC (VIF)8

FM FIL9

AFT OUT10

DATA11

CLOCK12

ABL13

R IN14

G IN15

B IN16

BLANK IN17

VCC (RGB)18

R OUT19

G OUT20

B OUT21

AKB IN22

V OUT23

RAMP ALC.FIL24

VCC (H)25

H AFC FIL26

H OUT27

FBP IN28

VCO IREF29

CLOCK OUT30

VCC (CCD)31

OSD CONTRAST32

GND (CCD/H)33

X-RAY34

KILL FLT35

APC2 FIL36

FSC OUT37

XTAL38

APC1 FIL39

SEL VIDEO OUT40

GND (V/C/B)41

EXT VIDEO IN42

VCC (V/C/D)43

INT VIDEO IN44

BLK STRETCH FIL45

VIDEO OUT46

APC FIL47

VCO COIL48

VCO COIL49

VCO FIL50

EXT AUDIO IN51

SIF OUT52

SIF APC FIL53

SIF IN54

C207100V0.01

2

2

8

11

2

10

7 1

1

1

1

3

3 4

5

9

9

3

4

2

4

3

Circuit Diagram

NO:M-LA-EC-2199-76812 -Edition: 2002.12.30

Circuit Block Diagram

Picture/Sound IF Amplifier, Video and audio signal

Processing, RGB Output Circuits and H &V Sync pulse

segregation

SAW

Sound Power Amplifier

Main Processor

Infrared Receiver Remote Controller

ROM

Audio/Video In/Out

Horizontal Scan Output

Vertical Scan Output

CRT

Antenna

Tuner

I2C BUS

Circuit Block Diagram

21

PCB

22

12. Circuit Explanation

IC reference data:

1). N701 (LC86F3232A) Pin No. function voltage V Pin

No. function voltage V

1 n.c 22 R-input 0.06

2 Connect to 5V via a

resistor 5.03 23 G-input 0.06

3 Connect to 5V via a

resistor 5.03 24 B-input 0.07

4 Connect to 5V via a

resistor 5.04 25 Blank 0.15

5 Connect to 5V via a 5.03 26 n.c. 0.01

6 Connect to 5V via a

resistor 5.03 27 I2C bus control 0 4.85

7 standby 0.03 28 I2C bus control 0 4.79

8 n.c. 0 29 I2C bus control 1 5

9 Ground 0 30 I2C bus control 1 4.99

10 Scl 1.47 31 Connect to 5V via a

resistor 5.03

11 sdl 2.2 32 Connect to 5V via a

onnect to 5V via a resisto 5.04

12 Power supply 4.99 33 Connect to 5V via a

resistor 5.03

13 Key input 0.24 34 遥控接收 0.03

14 AFT in 2.77 35 Connect to 5V via a

resistor 5.02

15 AGC in 1.7 36 Connect to 5V via a

resistor 5.01

16 n.c. 1.7 37 mute 0.11

17 Reset 4.99 38 AV select 0.02

18 Filter 3.13 39 Connect to 5V via a

resistor 5.02

19 CVBS in 3.25 40 Connect to 5V via a resist 5.01

20 V syn input 4.8 41 C resistor 5.01

21 H syn input 4.12 42 Connect to 5V via a

resistor 5.02

Circuit Explanation

23

2). N101 LA76812 Pin No. function voltage V Pin

No. function voltage

V 1 Audio output 2.23 28 FBT input 1.06

2 FM output 2.23 29 VCO IREF 1.69

3 IF AGC filter 2.22 30 Clock output 0.002

4 RF AGC 2.59 31 VCC 0.002

5 PIF AMP input 1.30 32 OSD gain control 3.05

6 PIF AMP input 2.83 33 Gnd 0

7 IF ground 2.83 34 X-ray pretect 0.06

8 IF VVcc 0 35 ACC killer filter 0.39

9 FM filter 4.94 36 APC2 filter 3.49

10 AFT output 1.90 37 FSCout 0.54

11 Bus data 2.77 38 XTAL 2.87

12 Bus clock 4.85 39 APC1 filter 3.2

13 ABL 4.76 40 Selected video output 2.43

14 R-input 3.92 41 Video chroma deflection 0

15 G-input 0.14 42 Ext video input 2.55

16 B-input 0.15 43 Power 5

17 Fast blanking input 0.08 44 Int . video input 2.77

18 RGB Vcc 7.94 45 Black stretch filter 2.6

19 R-output 2.21 46 Video input 2.12

20 G-output 2.36 47 APC filter 3.5

21 B-output 2.28 48 VCO coil 4.3

22 H-synchronize output 0 49 VCO coil 4.3

23 Vertical output 2.47 50 FLL filter 2.24

24 Vertical ramp ALC filter 2.65 51 Ext audio input 2.12

25 Power 5.10 52 SIF output 1.95

26 AFC filter 2.49 53 APC filter 2.38

27 Horizontal output 0.63 54 SIF input 3.14

Circuit Explanation

24

13. Adjustment

IF alignment: 1). Test equipment:

a. 45.75MHz sweep generator

b. 15V/3A DC power supply (with short and over current proof)

c. Digital multi-meter d. If alignment tool

f. User Remote controller g. Service remote controller h. Video signal generator i. Multi-system adjustment tool

j. 60MHz double trace oscillograph(2 units) k. White balance adjustment instrument

2). Signal, power supply connection:

a.Connect +15V DC power supply to the +15V testing top in the main PCB.

b.Input sweep signal into IF testing top

c.Connect multi-meter to PIF-TP testing top in PCB.

3). Alignment

a.Connect 45.75MHz sweep generator to IF test top in PCB

b.Adjust T101 and make digital multi-meter display 3.6V±0.05V. (PIF-TP top can only connect to multi-meter).

Alignment and check: a. Connect main PCB with alignment tool, input factory adjustment signal, and turn TV

on. Adjust screen control on FBT and make screen brightness relevant receive 525-line

monoscope, adjust focus control on FBT and make focus relevant.

b. Pre-adjust power voltage: adjust RP551 and make +B voltage be 109V±0.5V. c. Check brightness, contrast, color, and sharpness: receive color bar signal and adjust

contrast, brightness, color, sharpness control, picture will change accordingly.

d. AV input check: press AV/TV button, screen will display AV mode or TV mode and audio

input signal can be observed, picture and sound must be normal.

S optimal.

Adjustment

25

Main power adjustment:

Adjustment: Connect voltage meter to +B on main PCB, make +B voltage be 110V±0.3V.

Screen voltage adjustment:

Adjustment: Tune TV on, receive a digital test pattern, set brightness and contrast standard

mode. Press “FACTORY” button on the service remote controller twice,”B/W balance display on the screen, then press “MUTE” button, and make a horizontal bright line display on the screen. Adjust Screen voltage of FBT, make the line just seen. Then press “MUTE” button and exit service mode. Press “P.STD” button and make picture enter standard mode.

AGC ALIGNMENT: Receive a color bar signal, 60dB,NTSC M color bar pattern, and check if there is noise in the picture, if there is noise, press FACTORY button and enter service mode, adjust RF.AGC value and make the noise just disappear, press FACTORY button and exit service mode.

White balance adjustment: Turn TV on, receive white field signal, and make the probe of white balance adjustment instrument touch with top and bottom of screen fully. Check if values of R, G, B are standard, if not, press “FACTORY” button, make “B/W BALANCE” menu display on screen, adjust values of R-BIA, G-BIA, B-IA, R-DRV, G-DRV, B-DRV, make them standard. Press FACTORY button, exit service mode. OSD I2C bus control (LA76810) Varied range S-BRI Sub brightness 0-127 R-BIA Red bias 0-255 G-BIA Green bias 0-255 B-BIA Blue bias 0-255 R-DRV Red drive 0-127 G-DRV Green drive 0-15 B-DRV Blue drive 0-127 C.B/W Cross B/W 0-3

FOCUS ALIGNMENT Receive crosshatch (N system) pattern; Adjust focus-variable resistor on the FBT, make picture is the sharpest.

Adjustment

26

GEOMETRIC ALIGNMENT: Receive the monochrome circle pattern (NTSC system); Check vertical center and horizontal center and H-linearity .if they are not standard, press FACTORY button to enter service mode, and adjust vertical size, vertical linearity, vertical center, horizontal center, make them standard.

Alignment parameter table: Press FACTORY button on service remote controller and enter service mode: 1.Adjustment mode and2. Setting mode;

Use CH+ or CH- button up/down pages to select items that you need adjust; use

VOL+ or VOL- button

Adjustment