Related Manuals for Haier HTX21S31
Summary of Contents for Haier HTX21S31
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Page 1: Service Manual
HTX21S31 COLOR TELEVISION Service Manual MODEL: HTX21S31 Haier Features PAL M/N, NTSC M Front Audio/Video input V-CHIP, CCD 181 Channel Haier Group NO:M-LA-EC-2199-76812 Edition: 2002.12.30... -
Page 2: Table Of Contents
CONTENTS CONTENTS Contents--------------------------------------------------------------------1 Product Code illumination and Series Introduction--------------------2 Features--------------------------------------------------------------------------------3 Safety Precautions------------------------------------------------------------------4 Warning and Cautions-------------------------------------------------------------5 Net dimension----------------------------------------------------------------------11 Parts and Functions--------------------------------------------------------------12 Remote Controller Functions--------------------------------------------------13 Program Diagram------------------------------------------------------------------14 Maintenance Service and Trouble shooting------------------------------15 Circuit Diagram---------------------------------------------------------------------18 Circuit Explanation----------------------------------------------------------------22 Adjustment---------------------------------------------------------------------------24 Exploded View----------------------------------------------------------------------27 List of Parts--------------------------------------------------------------------------28 Damageable Parts List-----------------------------------------------------------41 Information of Resistors and Capacitors----------------------------------41... -
Page 3: Product Code Illumination And Series Introduction
Product Code illumination and Series Introduction Product Code illumination and Series Introduction X 21 S31 Color television appearance CRT size (unit: inch) Toshiba Haier... -
Page 4: Features
Features Features MODEL MODEL HTX21S31 HTX21S31 FUNCTION FUNCTION ITEM ITEM PICTURE SOFTWARE Main IC 76814 Digital curtain Flat square Slow fading on & off NTSC Color system Semitransparent menu Audio system Non-flashing channel changing Number of channels ZOOM E F S P 29... -
Page 5: Safety Precautions
Safety Precautions 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. -
Page 6: Warning And Cautions
Warning and Cautions Warning and Cautions 1. When you clean the TV set, please pull 4. To prevent the TV set from firing and out the power plug from AC outlet. Don't electric shock, don't clean the cabinet and the screen with make the TV set rain benzene, petrol and other chemicals. - Page 7 Warning and Cautions 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.
- Page 8 Warning and Cautions 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.
- Page 9 Warning and Cautions 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 F to 600 b. First, hold the soldering iron tip and solder the strand against the component lead until the solder melts.
- Page 10 Warning and Cautions 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.
- Page 11 Warning and Cautions 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.
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Page 12: Net Dimension
Net dimension 6.Net dimension Haier... -
Page 13: Parts And Functions
Parts and Functions 7.Parts and Functions HTX21S31 Picture Tube Audio (R) input Front Left Speaker Power indicator input Power switch TV/AV alteration button 11.Right speaker Menu button Volume up/down button Channel up/down button TV Rear Panel... -
Page 14: Remote Controller Functions
Remote Controller Functions 8.Remote Controller Functions TV/ AV D I S P S O U N D R ATI N G M EN U R E C ALL C H + V O L+ C H - S Y S P. -
Page 15: Program Diagram
Program Diagram 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 1). -
Page 16: Maintenance Service And Trouble Shooting
Maintenance service and trouble shooting Maintenance service and trouble shooting 1). Adjustment item Explanation: Explanation Range Remark H.PHASE H.PHASE 0~31 NT.H.PHASE H.PHASE 0~31 No used H.BLK.LEFT H.BLK.RIGHT V.SIZE Vertical Size 0~127 V.LINE Vertical Linearity 0~31 V.POSI Vertical DC 0~63 V.SC Vertical S-Correction 0~31 NT.V.SIZE... - Page 17 Maintenance service and trouble shooting BRT.ABL.DEF Brt.Abl.Def (0/1) MID.STP.DEF Mid.Stp.Def (0/1) R—Y/B-Y G.BL R-Y/B-Y Gain Balance (0~15) No use (LA76814) R-Y/B-Y ANG R-Y/B-Y Angle (0~15) C.KILL.OFF C_Kill OFF (0/1) SND.TRAP Sound Trap (0~7) VOL.FIL Volume Filter Defeat VIF.SYS.SW Video IF setting (0 45.75M 1 58.75M) For LA76814 VIDEO.LELEVL Video Level...
- Page 18 Maintenance Service and Trouble shooting No lig Check to see if Fuse3 is normal Abnormal Normal Check to see 110V 180V Check VD501, C507, etc. voltage is normal V513, etc. Normal Abnormal Check to see if the T est to see all terminal collector voltage of V552 Resistance of load is 0V...
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Page 19: Circuit Diagram
Circuit Diagram 11. Circuit Diagram... - Page 20 Circuit Diagram B901 XP601 XS601 3W16OHM CRT BOARD SCN3-2Y TJC3-2A R907 R902 2W10K 1/6W100 V902 A101 UV1336B 2SC2688 B902 C903 3W16OHM 63V56 R904 VD901 R908 1/6W330 1N4148 R604 1/2W2.7K R718 1/6W4.7K R906 2W10K V603 C901 1/6W560 R917 C616 C617 63V390 110V 2SC1815 R801...
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Page 21: Circuit Block Diagram
Circuit Block Diagram Circuit Block Diagram Antenna Sound Power Amplifier Picture/Sound IF Amplifier, Tune Video and audio signal Processing, RGB Output Circuits and H &V Sync pulse Horizontal Scan segregation Output C BUS Vertical Scan Output Main Processor Audio/Video In/Out Infrared Receiver Remote Controller NO:M-LA-EC-2199-76812... -
Page 23: Circuit Explanation
Circuit Explanation 12. Circuit Explanation IC reference data: 1). N701 (LC86F3232A) function function voltage V voltage V R-input 0.06 Connect to 5V via a 5.03 G-input 0.06 resistor Connect to 5V via a 5.03 B-input 0.07 resistor Connect to 5V via a 5.04 Blank 0.15... - Page 24 Circuit Explanation N101 LA76812 voltage function function voltage V Audio output 2.23 FBT input 1.06 FM output 2.23 VCO IREF 1.69 IF AGC filter 2.22 Clock output 0.002 RF AGC 2.59 0.002 PIF AMP input 1.30 OSD gain control 3.05 PIF AMP input 2.83 IF ground...
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Page 25: Adjustment
Adjustment 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 g. Service remote controller f. User Remote controller h. Video signal generator i. -
Page 26: Screen Voltage Adjustment
Adjustment 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”... - Page 27 Adjustment 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.