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21FA18-T (TB8873)

Order NO.WH070625S001V0

@ (2007)(Haier Electronic Company Limited)

All rights reserved. Unauthorized copying and distribution is a

violation of law.

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WARNING 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 b electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the product deal with in this service information by anyone else could result in serious injury or death.

CONTENT

1. SPECIFICATIONS………………………………………………………………………….. 3 2. WARNING…………………………………………………………………………………….. 4 3. FEATURES AND TECHINICAL DESCRIPTION………………………………………... 11

4. ADJUSTMENT………………………………………………………………………..………11 5. CIRCUIT DIAGRAM…………………………………………………………………………18

6. WIRING CONNECTION DIAGRAM……………………………………………………….18

7. CIRCUIT EXPLANATION.…………………………..…………………..………………….19 8. MAINTENANCE SERVICE AND TROUBLE SHOOTING………………………………22

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1. Specification

MODEL 21FA18-T

MODEL 21FA18-T NO. ITEM FUNCTION

NO. ITEM FUNCTION

1 Main IC 8873 24 Digital curtain √

2 CRT PURE FLAT 25 Slow fading on & off √

3 Color system PAL 26 Semitransparent menu √

4 Audio system

BG 27Non-flshing channel changing

√

5 NO.of channels 218 28 ZOOM √

6 OSD language ENGLISH 29 16:9 mode √

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PICTURE

Multi-picture modes 5 30 Games 1

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 FM RADIO ×

15 Tone adjuster × 38

SOFTWARE

V-CHIP ×

16 MTS/SAP × 39 NO. of built-in speakers 2

17

AUDIO

Auto-volume leveling × 40 Audio output power(W) 5×2

18 AV input back 1,side1 41 Total power input（W） 70

19 AV output back 1 42 Voltage range（V） 160~250

20 DVD terminal back 1 43 Power frequency（Hz） 50/60

21 S-video jack back 1 44 Time of sleep timer(MINS) 120

22 Headphone socket × 45 Net weight(KG) 23

23

JACK

SCART socket × 46 Gross weight(KG) 26

47 Net dimension(MM) 615/482/452

48

PARAMETER

Packaged dimension(MM) 651/576/526

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2. Warning

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.

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Warning and Cautions 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.

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

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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 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.

Electrostatic ally Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components are usually called Electrostatic ally Sensitive (ES) Devices. Examples of

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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

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.

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

Keep the soldering iron tip clean and well tinned.

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.

Use the following unsoldering technique

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

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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.

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

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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.

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).

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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.

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.

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.

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.

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 RISKELECTRIC SHOCK

DONOT OPEN WARNING:To reduce the risk of electric shick don’t remove cover or back.

No user-serviceable parts inside refer service to qualified service personnel.

Safety of operators has been taken into consideration at the design and manufacture phase, but

inappropriate operation may cause electric shock or fire. To prevent the product from being damaged, the following rules should be observed for the installation, use and maintenance of the product. Read the following safety instruction before starting the operation. The User Manual uses the following symbols to ensure a safe operation and preventany damage to operators or properties:

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3.FEATURES AND TECHINICAL DESCRIPTION FUNCTIONS :

1.ALL-BAND CATV (470MHz) 2.I2C bus control

3.Auto and manual tuning 4.Audio/video input/output interfaces

5.Multiple picture modes selection 6.Screen saver when no signal

7 PAL DK 8.218 programs Preset

9.volume setting stored 10.Program scan 11.Child LOCK 12.Slide curtain power on/off display，improved eye protection

4. Adjustment A..Factory adjustment information

Operation method: after the appliance is switched on, make the volume value to zero. Then press “ V- ” key on the TV set and press the DISP button on remote controller at the same time to enter the S state. Press DISP button one times and “S” will disappear, Repeat the first step, you will enter the D mode. Now one “D” is displayed on the TV screen. Press PRO- and PRO+ buttons to select items for adjustment. Press VOL- and VOL+ buttons to adjust selected items. Press the POWER button to switch off the appliance and go back to the normal state.

B.Maintenance menu (Table 8) Function Function bewrite referen

ce initialization

OSDH-POS OSD Hortzontal position 14 OPT function OPTION B4

RCUT R CUT OFF 22 GCUT G CUT OFF 33 BCUT B CUT OFF 2D GDRV G DRIVE 40 BDRV B DRIVE 40 CNTX SUB CONTRAST MAX 7F BRTC SUB BRIGHT CENTER 52 COLC SUB COLOR CENTER FOR NTSC 40 TNTC SUB TINT CENTER 40 COLP SUB COLOR CENTER FOR PAL 02 COLD DVD COLOR CENTER (DIF) 05 SCNT Y-SUB CONTRAST 0A CNTC SUB CONTRASRT CENTER 4B CNTN SUB CONTRASRT MINIMUM 07 CNTD DVD CONTRAST MAX 7F

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BRTX SUB BRIGHT MAX 20 BRTN SUB BRIGHT MINIMUM 20 COLX SUB COLOR MAX 25 COLN SUB COLOR MINIMUM 0D TNTX SUB TINT MAX 28 TNTN SUB TINT MINIMUM 28 ST3 SUB SHARP CENTER NTSC3.58 IN TV 19 SV3 SUB SHARP CENTER NTSC3.58 IN VIDEO 1D ST4 SUB SHARP CENTER OTHER COLOR SYSTEM IN TV 25 SV4 SUB SHARP CENTER OTHER COLOR SYSTEM IN VIDEO 1D SVD SUB SHARP CENTER IN DVD 1B

ASSH ASYMMETRY – SHARPNESS 05 SHPX SUB SHARPNESS MAX POINTS FROM CENTER VALUE 1A SHPN SUB SHARPNESS MIN POINTS FROM CENTER VALUE 19 TXCX RGB CONTRAST DATA AT MAX DATA OF USER CONTRAST

OSD

RGCN RGB CONTRAST DATA AT MIN DATA OF USER CONTRAST OSD

ABCL ABCL， 17 DCBS DCBS， 95 CLTB The data when TV mode & SOUND SYS = M 89 CLTD The data when TV mode & SOUND SYS = M 89 CLTM The data when TV mode & SOUND SYS = M AC CLVO The data when YVU mode & SOUND SYS != M AD CLVD The data when YVU mode & SOUND SYS = M 88 OSDA excursus 01 HPOS 50HZ HORIZONTAL PHASE 50HZ * VP50 50 HZ VERTICAL PHASE 50HZ * HIT 50HZ VERTICAL AMPLITUDE * HPS SHIFT DAT OF 50/60HZ HORIZONTAL PHASE * VP60 60HZ VERTICAL PHASE * HITS SHIFT DATA OF 50/60 HZ HORIZONTAL PHASE * VLIN V-LINEARITY * VSC V-S CORRECTION * VLIS V-LINEARITY * VSS V-S CORRECTION *

UVBLACK high 4 digit is ublack low 4 digit is &vblack 88 HBOW HPARA

VCD_1BH high 3 digit and VCD_24H 88

BRTS SUB BRIGHT 00 RAGC RF AGC ADJUSTMENT 20 HAFC 1/2 AFC DATA ADJUSTMENT 86 NOIS Signal strength setting 0F NDTC NOISE DET count (Weak -> Normal) 1F VL1 VOLUME OUTPUT DATA AT 25% 09

VL25 VOLUME OUTPUT DATA AT 50% 3D

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VL50 VOLUME 100 57 VLX ??? 7F

MUTT Y-MUTE FOR SOFT START 00 STAT CONTRAST UP FOR SOFT START 00 FLG0 Flag0 44 FLG1 Flag1 70 SVM PIC1 SVM 50

VBLK V BLANKING START AND STOP POINT 00 VCEN V CENTERING 2E UCOM 00:GND;01:R OUTPUT;10:B OUTPUT;11:MONITOR RF AGC

VIA ADC 00

PYNX Normal H.SYNC max 33 PYNN Normal H.SYNC min 11 PYXS Search H.SYNC max 22 PYNS Search H.SYNC min 1E

RCUTS RCUTS 00 GCUTS GCUTS 00 BCUTS GDRVS 00 GDRVS GDRVS 00 BDRVS BDRVS 00 AV_OPT Av option 04

OPT2 Option 2 1C WAIT TIME Timing between power on and picture appearing 2F CUR_CEN Curtain beginning position BB CUR_STEP Curtain moving speed 02

AUSTP 04 MODE0 Multiple setting A9 MODE1 Multiple setting 0F OSDF OSD frequency 68 STBG S TRAP f0 for BG 06

STI S TRAP f0 for I 08 STDK S TRAP f0 for DK 08 STM S TRAP f0 for M 08

08

SSBG 08

SSI 08

SSDK 08 SSM

S TRAP HP/LP for BG S TRAP Q for BG S TRAP GD for BG

S TRAP HP/LP for I S TRAP Q for I S TRAP GD for I

S TRAP HP/LP for DK S TRAP Q for DK S TRAP GD for DK

S TRAP HP/LP for M S TRAP Q for M S TRAP GD for M

D5 D4 D3 D2 D1 D0 09

SYNC 04 SYBBN 00 SYBBF 00 SYSR

option

02 BBCT Blue back hysteresis counter (BUS H sync detection 04

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VCD0 ???? 08 VCD1 D1D0：00 38M；01：38.9M?????? 01 BL25 % of ATT for Balance 25 1E BL49 % of ATT for Balance 49 50 OV50 OSD vertical position for 50Hz 0C OV60 OSD vertical position for 60Hz 02 HIT1 16.：9 adjust 11 HIT2 Zoom adjust 06

COLX2 3A optiomize adjust 05 PCON Run press key 0 image resume contrast 32 PBRI Run press key 0 image resume bright 32 PCOL Run press key 0 image resume color 32 PTIN Run press key 0 image resume tint 32 PSHA Run press key 0 image resume definition 32 PVOL 32

BR_BRI bright numerical value adjust 50 CO_BRI bright numerical value adjust 32 DK_BRI bright numerical value adjust 32 BK_BRI bright numerical value adjust 1E

BR_CONT Contrast numerical value adjust 64 CO_CON Contrast numerical value adjust 64

DK_CONT Contrast numerical value adjust 32 BK_CON Contrast numerical value adjust 32 V_NOISE Sound quarrel ‘snumerical value 28 V_MID 1E

V_QUIET 0F PWR BUS MEM Q501 QT01

OPT： BIT FUNCTION 0 Hotel mode 1:welcome logo 0:haier logo 1 No use 2 V_Mute ON/OFF when ＣＨ changes(=1:ON) 3 AUDIO GAIN SW of tb1240 4 Not VT Down of AFT when No Signal(=1) 5 TINT 0:use 1:unused 6 Select TV sync(0) or MONITOR sync(1) 7 Mute of av switch key 1.use 0.no use ABL： BIT FUNCTION 0 1

ABL-Gain 00:-0.2;01:-0.4;10:-0.6;11:-0.8v

2 ABL Start Point 00:-0.0;01:-0.15;10:-0.3;11:-0.45v

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3 4 5

ACL ST ????????

6 WPS 0:Y peak limiter off 1:Y peak limiter on,105IRE 7 No use DCBS BIT FUNCTION 0 1

BLACK STRETCH black strecth 00：Off；01：Black stretch point,26IRE; 10 : 33 IRE; 11 : 43 IRE ???

2 3

Y GAMMA 00：Off；01：Y γ point 90 IRE,Gain –3dB; 10 : 82 IRE ; 11 : 75 IRE

4 VCD BS SW 5 VCD CORING 6 VCD BLACK 7 C TRAP Q CLTO\CLTM\CLVO\CLVD BIT FUNCTION 0 1 2

Y Delay Time 000:-40 nsec;001:0;010:40 nsec;011:80 nsec;100:120 nsec;101:160 nsec;110:200 nsec; 111:240 nsec

3 4

N Phase 00:USA(105 degree);01:Japan(93 degree);10:11:DVD

5 Color Y 0:Color gamma off ;1:On; 6 PN-ID Sens 0:PAL/NTSC killer sensitivity,1mVpp; 1:10mVpp 7 FID 0:Normal;1:Alwas killer off,i.e. always color on.. SYNC: BIT FUNCTION 0 Select sync slice level for weak signal 1 Select sync separation level 2 Select H sync judgement : 0:BUS, 1:TC3 3 UNUSE 4 UNUSE 5 UNUSE 6 UNUSE 7 UNUSE SYBBN: BIT FUNCTION 0 UNUSE 1 UNUSE 2 Select window pulse for H lock detection 3 Select H lock detection mode 4 Select SY-DET-1 for sync dtection 5 Select SY-DET-2 for sync dtection 6 Select LPF mode for sync dtection 7 UNUSE SYBBF

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BIT FUNCTION 0 UNUSE 1 UNUSE 2 Select window pulse for H lock detection 3 Select H lock detection mode 4 Select SY-DET-1 for sync dtection 5 Select SY-DET-2 for sync dtection 6 Select LPF mode for sync dtection 7 UNUSE SYSR: BIT FUNCTION 0 UNUSE 1 UNUSE 2 Select window pulse for H lock detection 3 Select H lock detection mode 4 Select SY-DET-1 for sync dtection 5 Select SY-DET-2 for sync dtection 6 Select LPF mode for sync dtection 7 UNUSE FLG0: BIT FUNCTION 0 0:NORMAL;1:PIF over modulation switch on 1 0:BPF;1:TOF 2 0:Nyquist Buzz cancel,on;2:off 3 0:Off, 1:If BB=1, RGB out is 110 IRE 4 TB1254N band pass filter switch 5 SIF FIX Select 0:fix to normal, 1:control with sound system 6 SIF 5.74 Select In D mode, aplly this bit to SIF 574 7 vco readjust when position select 0:disable;1:enable; FLG1: BIT FUNCTION 0 CW SW 1 V ramp bias 2 Sync. Sepa. level 3 Horizontal side blanking 4 UNSED 5 UNSED 6 1：count time clear to 20H；0：count time clear to 0H 7 1：user press key SLEEP clear time；0：no SVM: BIT FUNCTION 0

1

SVM gain 00:-6dB;01:0dB;10:+6dB;11:+12dB

2 3

SVM DL(svm delay) 00:off;01:-100ns;10:-60ns;11:-40ns

4 Mon、svm ？？？？？？

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5 6 1: SOFT CHANGE CHANNEL 0：no 7 UNUSE VBLK BIT FUNCTION 0

1

00:23H;01:33H;10:37H;11:41H (50Hz) 00:22H;01:30H;10:34H;11:38H (60Hz)

2 3

00:310H;01:299H;10:295H;11:291H (50Hz) 00:263H;01:254H;10:250H;11:246H (60Hz)

4 5 MODE0: BIT FUNCTION 0 1：218 channels；0：100 channels 1 1：5060 （M system）；0：tow way AV 2 0： SECAM；1：no 3 1：RGB Out-Cut Off DC；0：Y-MUTE 4 1：ALWAYS DISPLAY SOME MENU；0：SOMETIMES DISPLAY SOME MENU 5 0：ALPS 1:panasionc 6 7

SHOP OUT 00：DK；01：I；10：BG

MODE1: BIT FUNCTION 0 0:no BG;1:yes 1 0:noI;1:yes 2 0:noDK;1:yes 3 0:no M;1:yes 4 0:when asm & search,set up VCO adjust req. ,1:only power on

0:PIF VCO adjust trigger 1: normal (12 :bit 7) 5 The algorithm of ASM. 0:ASM doesn't judge IFLOCK with case 4. 1:ASM judge IF

LOCK with case 4 6 The algorithm of ASM. 0:ASM doesn't judge Fhsync with case 4. 1:ASM judge Fhsync

with case 4 7 TINT polarity ,input to V/C/D. 0:normal 1:invert AV_OPT： Byte FUNCTION Video1 Video2 Video3 0 VIDEO DVD 1 VIDEO S-VIDEO DVD 2 VIDEO DVD VIDEO 3 VIDEO S-VIDEO DVD 4 VIDEO/S-VIDEO DVD 5 VIDEO/S-VIDEO VIDEO DVD 6 VIDEO DVD VIDEO 7 VIDEO VIDEO DVD OPT2:

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BIT FUNCTION 0 lunar calendar 1:have lunar calendar ; 0:no lunar calendar 1 No use 2 1：english 0：chinese 3 AV WITH MUTE；1：yes；0：no 4 No use 5 1：super incept 0：no 6 No use 7 0：boot-strap welcome 1：no MOD： BIT FUNCTION 0 1

akb CUTOFF SENSITI VITY

00：*9.75;01:*10.00;10:*10.25;11:*10.50

2 3 MOD.3:0 CUTOFF range:-0.65~+0.65;1:-0.65~+0.85 4 5 6

000：NO；001：45.75；011：38.9；100：38.0

7 OSDA BIT FUNCTION 0 1

OSD CONTRAST 00:80 IRE 01:70;02:60;03:50;

2 3 OSD ABL: RGB ABCL 0:ABCL active for OSD 0:inactive 4 5 6 7 You can change the DATA with “*” mark when necessary.

5. CIRCUIT DIAGRAM

6. WIRING CONNECTION DIAGRAM

6

5

3

4 1

2

10

7

KSC

KFC

HV

(EMC)T401JF0501-19910

1

2

3

N206

HS0038A2

A01

A12

A23

VSS4 SDA 5

SCL 6

TEST 7

VCC 8

N202 NM24C08EN

1 3

2

N2047805

R433330

V4312SC2383

R4341K

C431500V3900p

C4321000p

T402BCT-02

C43347u/35V

R439

0.5W 20K

L405ZZ0008

C4152KV 6800p

C4162KV 680p

C4120.39u630V

C423100V 0.1u

R44210K

+33V

N121uPC574J

C1261000P

C125

10u 50V

R128 2W12K

R6450.25W 1K

S705

MENU

S706TV/VIDEO

S704

VOL -

R765110K

R76430K

R76315K

S703

VOL +

S702

CH -

S701

CH +

R76211K

R7615.6K

BL301

R-10W8

+200V

L407 LX37

R4130.5W4.7K

G2018M

R80975

!

!

R4352W 270

R432330

VIDEO1 IN

AUDIO1 IN(L)

Y

C

XS801

C8030.01u

R80775

1 2

XS301

1

2

3

4

L410LHDY

1

3

5

4

XS401

R20

7

1K

R20533K R209

1K

R2118.2K

C212

0.1u(M)

C2131u

C2140.1u(M)

R212100

R213100

R214100

C2090.22u(M)

C21

047

0u C2110.01u

L21247u

R216100

C2160.47u C248

0.47uC21510u

C22

010

u

VD2021SS133

C2190.1u(M)

R218100K

C2210.1u(M)

C225

0.01uC226NP 10u

C2270.47uC

228

1000

P

C229470u

C2300.01u

L204 PL-12uH

C2314.7uC232

OPEN

R221750

C2332.2u

C234100u

C235

0.01u

C2361u

R22

322

0K

R22

430

K

C2370.22u

C23

822

00P

R227270

R226270

R225270

VD251HZ10

VD253HZ10

VD252HZ10

C2440.01u

C245

10u

R23047

C2490.01u

C25010u

R229 10K

R228 10K

C1050.01u

R23422K

R23322K

C247100P

C2020.01u

C2060.01u

C20510u

L20110u

C25547u

R250100

R246150

L10468uH

C1080.01u

C107220u

R11315K

R114100k

C1094.7u

C240

0.01u

C239

10u

V301A1015Y

VD3011SS133

R313 4.7K

C31347u

VD3021SS133

R21

70.

5W 2

70

R812OPEN

Y

Cb

CrR81775

R81875

R81975

C2242.2u 50V

R215100

C2080.47U

C2078200P

C203CH20p C204

CH20p

+115V

R2371.5K

VD201HZ3.6V

R236

8.2K

V203A1015Y

R2104.7K

R44610K

C2010.01u

R235 1K

R58110K R582

10K

V556C1815Y

OFFON

B6+9V

C2520.01u

C251100u

V4322SD2499

R6390.5W 150k

RP60120K

R6403.6K

C643 0.15u

!

XS601 SW601

(EMC)C6010.22u/250VAC

(EMC)L602LCL -04

(EMC)C6020.1u/250V

1

23

RT601

PDC7RQPP6B744

C6051KV 1000p

C6061KV 1000p

C6031KV 1000p

C6041KV 1000p

(EMC)L603LCL -04

(EMC)VD603~VD606

RM11CC607

150u/450V

VD698

EU2A

VD699TRG1C

VD697EU2A

C695OPEN

C615 AC400V2200p

R6931W 5.1R

R599

1K

R6010.5W220K

F6012.5A/250V

R6980.5W220K 7

R602 7W 1R8

!

!C696

10u/50V

C6933900P

1

XS602

1

L909QHXC-54F(AL)

L207PL-10uH

R40116K

V205C1815Y

R2432.2K

VD3051SS133

XS802

VD207

R2633.3K

R2413.3K

AV (Pin 61)

OSD Pin 61(N201)

TV

AV1

AV2

DVD

0V

0V

5V

0V

C-IN

R4511W4.7K

C440100V4700p

VD420RD9.1CB

Inpu

t1

Vcc

2

Pum

p U

p3

GN

D4

Out

put

5

Out

Vcc

6

Refe

renc

e7

N401 STV9302A

C4012700p

C402NC

VD4021N4761A

C4030.22u

C409220u/35V

C40410u/16V

R4035.6K

R40412K

C407 100u/35V

VD401EU2A

R40562K R406 47K

C40525V/0.47u

R40710k

R4020.5W 1

R408150

C408100V 0.047u

C4061000u/25V

R4120.68

AUDIO1 IN(R)

C6251KV 470p

VD623RU4YX

C629 470p/1KV

C63022u/250V

VD625 EU2A

C623470p/1KV

VD622RU4YX

C621470p/2KV

VD624S2L60U

C6222200u/25V

C640220u/160V

VD621RU4YX

C627 470p/2KV

C626

2200u/35V

+27VB2

B3+12V

B5+5V CPU

B4+13V

R64339K

R697

3W 56K

C698220p/1KV

C694 47n

R6950.25W470

R6941W 1.5K

R59810K

R531 12M

V555D400

R5570.5W12

R558470

VD570MTZ10A

C5704.7u

+13V

+8VH.VCC

B4

C5220.01u

C521470u/16V

B6+9V

1 3

2

N205

7808

R570 1W 27

C5200.01u

1 3

2

N705

TA7805

K

R

AN604KA431LZ

+115VB1

+115VB1

L401TEM2011

B5+5V CPU

+8VH.VCC

B6+9V

DRA

IN1

GN

D2

VCC

3

FB/O

CP4

SYN

C5

(EMC)N601CQ0765RT C6971000p/1KV

V598

2SB892R59610K

R597 3K9

C69922n/630V

V599 2SB892

VD599

1N4148

R595

0.25W-1K VD6411N4148

VD6141N4148

(EMC)

!

!

!

!!

!

!

!

!

!

R6310.5W 0.22

!

RZ601

C6242200u/25V

R6280.5W 2.2

R621 2W 1

!

R239270

IR

5V

GND

N602ATLP421

GB

+9V

GN

D R

1 2 3 4 5 6 7

XP201

HEAT

1 2

3

4XP402

R1021.5K

R107OPEN

R103OPEN

R10833

V101

2SC2216

L103

1uHC1040.01u

C1020.01u

R106390

X203L10.7M

R2204.7K

V204A1015Y

R219100

R242 330

R115

15k V102C1815Y

C1033.9K

C106OPEN

R1116.8K

R11010K

M

DK/I/BG

L205

R222

L605TEM2011

12

3 4

VD6951SS133

VD696OPEN

C568470u/16V

C5690.01u

VD5711SS133

R5591.8K

SYS(Pin 59)

SYS Pin 59(N201)

M

D/K

I

B/G

0V

5V

5V

5V

R436

0 C40010u 160V

R460

0.5W 220K

Sin

1

SW2

G3

SO4

SO5

Z101N6283

R105

0

R1090

R1122.2K

VD101

1SS133

21"-TSB-2IN1 Ref. Chassis(CQ0765)

C2570.01u

B6+9V

R100

220

L209

PL-12uH

VD682MTZ18C

R4091.2k

C4111uF/160V

VD413RU2A

+8VH.VCC

R814OPEN

C2232.2u 50V

R2011M

U/V

1

L/H

2

KEY

3

GN

D4

RESE

T5

X-T

AL

6

X-T

AL

7

TEST

8

+5V

9

GN

D10

GN

D11

SCP-

OU

T12

H-O

UT

13

H.A

FC14

V-S

AW

15

V-O

UT

16

H-V

CC17

GN

D18

Cb19

Y-IN

20

Cr21

EXT-

AU

DIO

122

C-IN

23

EXT-

IN24

ALC

FIL

TER

25

TV-IN

(1V

p-p)

26

ABC

L-IN

27

AU

DIO

-OU

T128

AU

DIO

-OU

T229

TV-O

UT(

2Vp-

p)30

SIF-

OU

T31

EXT-

AU

DIO

232

SIF-

IN33

DC

NF

34

PIF

PLL

35

IF-V

CC(5

V)

36

S-RE

G37

AU

DIO

MO

N38

IF A

GC

39

IF G

ND

40

IF IN

41

IF IN

42

RF A

GC

43

BLA

CK D

ET44

MO

NIT

OR-

OU

T45

APC

FIL

46

YC

5V47

SYN

C-O

UT

48

D V

cc3.

3V49

R-O

UT

50

G-O

UT

51

B-O

UT

52

D G

ND

53

GN

D54

5V55

MU

TE56

SDA

157

SCL1

58

SYST

EM59

VT

60

AV

SW

61

TV S

YN

C62

RMT-

IN63

POW

ER64

N201 TMPA8873

R2000

C20047u

C3054.7u C306

4.7u

R3042.2K

R3032.2K

C3040.01

C303

0.01

C309470u/25V

C3100.01u

R308270K

R30568K

C30747u

R301 5.6K

R302 5.6K

C301 2.2u

C3022.2u

VCC

1

OU

T12

GN

D3

OU

T14

STA

ND

BY5

IN1

6

GN

D7

IN2

8

VO

L9

OU

T210

GN

D11

OU

T212

N301 AN7522N

V302

2SC2878A

R31222KR309 47K

BL302

R-10W8

1

2

XS302

VD306

1SS133

SPO

T

L R

R

L

B3+12V

+5V-2

+5V-2

R2311.5M

R232OPEN

VD204OPEN

VD205OPEN

R244330

R2451K

V214A1015Y

R247150

R8111KR813

1K

7

5

3

1 14

9

11

13

12

8

10

T601BCK-05I-5

B7+180V

AG

C 1

VT

2

SCL

4

SDA

5

MB

6

IF11

AD

S3

+33V

9

U101

W109SHORT

W401

OPEN

W402

OPEN

V-OUT

R-OUT

L-OUT AV-OUT

C801470u 10V

R80275

R803220

V805

2SC1815Y

R801100

C80210uR806

1K

R8052.2K

V8022SC1815Y

R804100

R808100K

R810560

R8000.5W 100

C80722u 16V C800

100u 16V

C600100P

C610

0.47u(M)

R3201/2W-4.7K

R46218K

W6080.5W10

R927 RF10-1W-4.7

VE1 CRT

V9012SC2482

V9112SC2482

V921

2SC2482

VD9011N4148

VD9111N4148

VD9211N4148

R9031K

R9131K

R9231K

C901330P

C911330P

C921330P

R901 100

R911 100

R921 100

R9050.5W1.2K

R915 0.5W1.2K

R925 0.5W1.2K

1

2XS903

1

2

3

4XS902

200V

HEAT

GND

GN

D

9VG B R

1

2XP903

R902 560

R922560

R912

560

R904

15K 2W

R91415K 2W

R92415K 2W

C9022KV 1000P

1234567

XS901

R94033

SPO

T

R93647K

V933

2SC1815

R93510K

C9330.01u

VE1A CRT SOCKET

V931

A1015

VD931SHORT

VD932SHORT

C93110u/16V

R9311.2K

R932

2K7 R933330

R934

1K

+

C93247u/16V

R6990.25W 1K

2.2UC311

C3120.1UF

V3032SC2878A

R31422K

C314 2.2U

VD681MTZ5.1B

C68110u/50V

R6812W-1K

VD608EU2A

L901PL-12uH

VD950MTZ10A

GND

VD263MTZ5.6C

VD261MTZ5.6C

VD264MTZ5.6C

VD266MTZJ3.6A

R1301K

C130MTZ5.1B

19

7. Circuit Explanation 1、Microprocessor and Small signal processing: super monolithic integrated circuits ： Haier8873 Haier8873CSN is super large integrated circuit decoder, containing intermediate image amplifying, intermediate sound amplifying, horizontal and vertical scan, small signal processing, color decoding, hi-pressure tracing and over-load protection, I2C bus control. Information introducing functions and testing data for maintenance is listed in Table 1. Table 1

Ground Resistance (R) Step Function

Working Voltage

(V) Positive

(Ω) Negative

(Ω) 1 U/V 0 600 5000 2 L/H 1.8 600 5000 3 KEY INPUT 5 600 15000 4 DIGITAL GND 0 0 0 5 CPU RESET 5 600 10000 6 X.TAL 2.3 600 1000 7 X.TAL 2.0 600 15000 8 TEST 0 0 0 9 +5 VCC 5 400 4500

10 GND 0 0 0 11 SIGNAL GND 0 0 0 12 HORIZONTAL SYNC SIGNAL INPUT 1 750 150 13 HORIZONTAL RETURN PULSE

SIGNAL INPUT CHARACTER HORIZONTAL LOCATION

1.7 500 550

14 HORIZONTAL AFC 6.3 750 1400 15 VERTICAL SIGNAL PRODUCE

LOCATION 4.3 750 1500

16 VERTICAL RETURN PULSE SIGNAL INPUT CHARACTER VERTICAL LOCATION

5.3 750 1300

17 HORIZONTAL VCC 8.7 100 100 18 GND 0 700 900 19 Cb SIGNAL INPUT 2.4 750 5000 20 Y SIGNAL INPUT 2.4 750 5000 21 Cr SIGNAL INPUT 2.4 700 4500 22 EXT AUDIO 0 0 0 23 COLOR SIGNAL INPUT 0 0 0 24 EXTERIOR VEDIO SIGNAL INPUT2 2.4 700 4500

25 ALL FILTER 3.4 320 300 26 VEDIO SIGNAL INPUT 2.6 750 5000 27 ABCL-IN 4.5 750 5000 28 AUDIO OUTPUT 1 3.5 750 1400

20

29 AUDIO OUTPUT 2 8.8 100 100 30 TV OUTPUT 3.6 700 950 31 SIF SIGNAL OUTPUT 1.8 700 2100 32 EXTERIOR AUDIO 2 4.3 750 1400 33 SIF SIGNAL INPUT AND LEVEL REVIS 2.9 750 5000 34 DC FEEDBACK 2.2 750 1400 35 PIF PLL 2.4 500 1500 36 +5 IF VCC 5 750 1100 37 S-REG 2.1 750 4000 38 AUDIO MON 4.4 700 1400 39 IF AGC 1.7 0 5000 40 IF GND 0 650 0 41 IF INPUT 0 650 4500 42 IF INPUT 0 750 4500 43 RF AGC 3.5 500 1400 44 BLACK DET 5 600 1100 45 MONITOR OUTPUT 1.9 650 2200 46 APC FIL 1.8 750 5000 47 YV 5V 5 0 5000 48

SYNC OUT

1.8 100 0

49 VCC 3.3 750 100 50 RED SIGNAL OUTPUT 2.9 750 1100 51 GREEN SIGNAL OUTPUT 2.9 750 1100 52 BLUE SIGNAL OUTPUT 3.1 0 1100 53 TV SIMULATE GND 0 0 0 54 GND 0 400 0 55 +5V VCC 5.1 600 4500 56 MUTE 0 600 7500 57 I2C SERIAL BUS DATA LINE 0 0 600 12500 58 I2C SERIAL BUS COLOCK LINE 0 0 600 12500 59 SYSTEM 0.1 600 12500 60 TUNE VOLTAGE 4.4 600 10000 61 AV CHOICE CONTROL 0.2 600 10000 62 HORIZONTAL SYNCHRONIZATION

SIGNAL 4.5 600 12500

63 REMOTE CONTROL INPUT 5 600 12500 64 POWER 3.6 600 8000

1.Analysis of common path circuits High frequency television signals, received via an antenna (or transmitted through a cable TV system) to the input terminal of the high frequency tuner A101, are processed for tuning and high frequency amplifying and mixing, then a 38.9MHz image intermediate frequency and 34.4MHZ and intermediate frequency signal will be released at the IF terminal of Z101 to b of the transistor V101, where signals are amplified to compensate for the insertion losses of the sound surface wave filter. Single or dual-ended input is used for

21

the sound surface wave filters Z101 of this appliance according to system properties. Intermediate frequency signals will be transmitted to (41) and (42) of N201(HAIER8873). The mixed signals of picture video signals and secondary sound intermediate frequency signals output from (31) of N201, After sound carrier frequency is trapped by the trap filter, intermediate frequency signals are amplified and PLL image decoded, The AGC time constant is dependent on C233 (2.2u) connected to (39) of N201 (HAIER8873),. 2.Analysis of sound power amplifying circuits Sound power amplifying circuits are composed of integrated circuits AN7522N and peripheral components. AN7522N is an integrated electrical circuit . Information introducing functions and testing data for AN7522N maintenance is listed in Table 4. T if a cylindrical color card is installed then a fluke III digital multimeter is used.

Grounding Resistance (R)No. Function Working

Voltage (V) Positive (Ω) Negative (Ω)

1 VCC 12.56 2 OUT1+ 6.52 3 GND 0 4 OUT1- 6.52 5 STANDBY 3.75 6 IN1 1.43 7 GND 0 8 IN2 1.43 9 VOLUME 1.99 7 GND 0 8 IN2 1.43 9 VOLUME 1.99

3.Analysis of vertical sync and vertical scan output circuits The field sync signals segregated from compound sync signals are used to activate the vertical frequency segregation system which commences when a set amount of vertical sync pulse signals are tested. Of the sync pulse frequencies obtained from segregation, some are transmitted to the vertical tooth wave generator. The vertical frequency tooth wave, after geometric processing, is transmitted from (16) of N204 (HAIER8873) to (5) of vertical scan output IC N401 (STV9302A). The external resistor R443 (5.6KΩ) of N201 (16) provides a reference current to the vertical tooth wave generator. The external capacitor C244 (0.1uF) of pin (2) forms the vertical ramp wave. The vertical ramp wave is sending the pin (4) of the vertical scan output integrated circuit N401 that is a complete bridge current drive output circuit. After shaped and amplified the vertical ramp wave is output from pin (2) of N401. Information introducing functions and testing data for STV9302A maintenance is listed in Table 4. if a cylindrical color card is installed then a fluke III digital multimeter is used. Table 5

Grounding Resistance (R)No. Function

Working Voltage

(V) Positive

(Ω) Negative

(Ω)

22

1 input 2.61 0 0 2 VCC 26.56 0.45 1.9 3 PUMP UP 2.21 0.5 ∞ 4 GND 0 0.9 1.25 5 output 16.31 0.68 1.75 6 OUT VCC 26.87 0.5 2.95 7 reference 2.62 0.65 1.3

4.Analysis of horizontal sync and horizontal scan output circuits As the horizontal oscillation circuit is installed inside N201 (HAIER8873), Some brightness signals including compound sync signals are transmitted to the internal sync segregation circuits, where horizontal sync and vertical sync pulses are segregated. R321 (10K), R462 (12K) 、C452 (3900pF) 、VD436 and T401 are connected to N201 (13) are phase-lock loop filters. Horizontal pumping signals are transmitted from (13) of N201 to horizontal promotion transistor V431 (2SC2383), and then drive the H-DRIVE transformer. After being amplified through it switches power transistor V432 (2SC5885) to control the horizontal scan of the electronic-beam.C412 is a horizontal S correction capacitor and L407 is for horizontal linear inductor. T401 is a horizontal output transformer. The horizontal return pulse output from (7) of T402 is transmitted to pin (27) of N201 who controls ABL circuits. ABL avoid high-voltage over rated value that will cause X-ray and affect your health. 5.Analysis of video amplifying circuits The video amplifying circuits are comprised of V901, V911, V921 and peripheral components. R, G and B signals output from N201 (50), (51) and (52), 3 video power transistor are available for amplifying the input R, G, B. White balance adjustment is completed through N202 under control of an I2C serial bus control system.

8. Maintenance Service and Trouble shooting

A. Principle integrated circuits

A1. 21 INCH color TV set composed of the following sections (1) Small signal processing: super monolithic integrated circuits N201(Haier8873).

and memory N202 (AT24C08). (2) Sound power amplifying: integrated circuits N301 ( AN7522N). (3) Horizontal and Vertical scan output circuits: Vertical output integrated circuits

N401 (STV9302A), Horizontal output transistor V432 (2SC5885), Horizontal flying back transformer T401 (JF0501-19910).

(4) Switch power supply: switch transformer T601 (BCK-05I-5), power IC N601 (CQ0765).

23

A2. Main integrated circuits:

(1) Haier8873 Microprocessor Picture IF/sound IF/video processing/H and V

Scan/color decoding (2) STV9302A Vertical output integrated circuits (3) AN7522N Sound power amplifying integrated circuits

A3. Error Detection Process 1.

Check to see if Fuse is normal

No light and sound

Abnormal

Check VD604~VD607, C607, N601, N604 etc.

Check to see if the collector voltage of V598

is 27V

The failure ofhorizontal unit

orN204

Check to see if , 8v,

5v is normal

Check the control

voltage of V599 or CPU power pin

Check N202 ,ect

Normal

Normal

Normal Abnormal

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

Test to see all terminal Resistance of load

Check switch power unit

Check to see if rectifying tube

is normal

Check the Loader

Change

rectifying diode

Abnormal

Normal

Abnormal

Normal Abnormal

Normal Abnormal

The failure of horizontal unit orN201

24

2

Normal Abnormal

Video amplifying board is abnormal

T401,VD415 or C415,C416 are

broken

V432 is not well welded or open

Higher Lower

Inspect the circuit from pin50 、51、

52 of N201 to video amplifying

Check the voltage of V432 collector is

normal

InspectT401、R436 etc.

Normal

Abnormal

NO

YES

Abnormal Normal Normal Abnormal

Abnormal Normal

Check the voltage of all pins of XS903

Heater Resistor open

Check to see if be voltage of V432 is

existed?

Check the circuit from pin13 of N201 to

V431

No raster

Whether G2 voltage is normal

Change wrong component or check peripheral circuit

Check to see if +8V voltage is normal at

PIN 17 of N201

Check G201、N201 and peripheral circuit of N201

Check +8V power supply

Abnormal Normal

Test filament voltage Test the base voltage of V431

25

3 4.

Check to see if the deflection yorks are connected, C433 is

open or weldless. Inspect peripheral component of N401

and N401 itself

Inspect +27V power supply

Inspect N201 and peripheral components of

N201

Change N201 and repair circuit

Normal

Yes No Yes No

Check to see if the voltage of pin 15 and pin16 of N201 is

normal

Check to see if voltage of pin6 at N401 is normal

Yes No

Make R328 open. Multimeter is at range RΧ1K. Red probe connects to ground. Touch No.5 of N401 with

black probe. Bright line flashes for a moment

Horizontal bright line

Snowy noise exist

No sound and picture

Not exist Exist

Check to see if RAGC is at 00 mode

Check to see if voltage output available at tuner

Enter D-MODE or enter S-MODE with customer remote controller. Make RAGC tuned to 25 or so.

Noise on picture just disappears.

Inspect V101、Z101、N20and PIF

part

Yes No

Antenna or tuner is abnormal

Inspect the circuit from

CPU to tuner

Yes No

26

5 6.

Make C305/C306 open. Multimeter is at band RΧ1K. Red probe connect to ground. Touch No.6 OR No.8 of N301 with

Picture exists but no sound

Make C301 OR C302 collector open. Touch No.6 OR No.8 of V301

with black probe to see if noise

Power amplifier is abnormal. Inspect N301 and peripheral

components of N301

Inspect C301、C302 Check to see if +11V exists

Inspect N201 and peripheral component of N201

Inspect +11V power supply

Yes No

Yes No

Yes No

Have noiseNo noise

Inspect Inspect the circuit from No.50of N201 to No.3

of XS903

Yes No

Change V901 or weld V901 again

Check to see if voltages of XS901 are normal

Lack of red

Check to see if V901 is open or not well welded

Inspect R902,R903,R904

27

Poor color / tint,good sound

Before calling service personnel, please check the following chart for a

Symptom Check these things TV is not turned on

Spots appear on the screen

Lines appear on the screen

Good picture ,no sound

Be sure the power cord is plugged in.

The MUTE function may be used.Adjust the volume of the TV set.

The contrast, color and tint may be incorrectly adjusted.If you change the direction of the TV while the TV is on, the picture may suffer from color shading. If so, turn off the TV and allow about 30 minutes to cool, then turn on the TV again.

The broadcast signal may be jammed by other electrical sources such as cars, motorcycles, electric trains, high tension lines, neon signs, hair dryers.

The broadcast signal may be jammed by other TV receivers, personal computers, and TV games, as well as interference from radio stations.

Interference may be due to broadcast waves reflected from mountains or buildings.Check if the direction of the antenna is changed.

The antenna may be disconnected or falling out.Check if the direction of the antenna is changed.

The batteries in the remote control may be exhausted.The batteries may be improperly installed.Check if there are obstacles between the remote control and the remote (infrared ray) receiver.Check if there is strong light interference around the remote (infrared) receiver.Check if the main power is ON.

Double images or ghosts

Snowy picture or black screen

The following conditions are not troubles

Clacking noise inside the receiver

It may result from the expansion of the shell caused by a temperature change. This will not affect the picture and sound quality.

Uneven colour in a certain portion of the screen

If the picture is too bright, this may occur according to the nature of the pictures. Reduce the contrast, it may resume to normal.

Troubleshooting

CAUTIONIn case of problems, have your TV serviced by qualified personnel.Neverattempt to service the set yourself since opening the cabinet may expose you to dangerous voltage or other hazards.

possible cause to the trouble you are experiencing.

28

Sincere Forever

Haier Group

Haier Industrial Park, No. 1, Haier Road

266101,Qingdao,China

http://www.haier.com