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Haier 21FA18-T Service Manual

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Order NO.WH070625S001V0
21FA18-T
(TB8873)
@
(2007)(Haier Electronic Company Limited)
All rights reserved. Unauthorized copying and distribution is a
violation of law.
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Summary of Contents for Haier 21FA18-T

  • Page 1 Order NO.WH070625S001V0 21FA18-T (TB8873) (2007)(Haier Electronic Company Limited) All rights reserved. Unauthorized copying and distribution is a violation of law.

  • Page 2: Table Of Contents

    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.

  • Page 3: Specifications

    1. Specification MODEL MODEL FUNCTION 21FA18-T FUNCTION 21FA18-T ITEM ITEM Main IC 8873 Digital curtain √ PICTURE SOFTWARE PURE FLAT Slow fading on & off √ Color system Semitransparent menu √ Non-flshing channel √ Audio system changing NO.of channels ZOOM √...

  • Page 4: Warning

    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.
  • Page 5 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 6 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.
  • Page 7 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. Immediately before handling any semiconductor component or semiconductor- equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground.
  • Page 8 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.
  • Page 9 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.
  • Page 10 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.

  • Page 11: Features And Techinical Description

    3.FEATURES AND TECHINICAL DESCRIPTION FUNCTIONS : 1.ALL-BAND CATV (470MHz) C 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.
  • Page 12 BRTX SUB BRIGHT MAX BRTN SUB BRIGHT MINIMUM COLX SUB COLOR MAX COLN SUB COLOR MINIMUM TNTX SUB TINT MAX TNTN SUB TINT MINIMUM SUB SHARP CENTER NTSC3.58 IN TV SUB SHARP CENTER NTSC3.58 IN VIDEO SUB SHARP CENTER OTHER COLOR SYSTEM IN TV SUB SHARP CENTER OTHER COLOR SYSTEM IN VIDEO SUB SHARP CENTER IN DVD ASSH...
  • Page 13 VL50 VOLUME 100 MUTT Y-MUTE FOR SOFT START STAT CONTRAST UP FOR SOFT START FLG0 Flag0 FLG1 Flag1 PIC1 SVM VBLK V BLANKING START AND STOP POINT VCEN V CENTERING UCOM 00:GND;01:R OUTPUT;10:B OUTPUT;11:MONITOR RF AGC VIA ADC PYNX Normal H.SYNC max PYNN Normal H.SYNC min PYXS...
  • Page 14 V_QUIET Q501 QT01 OPT： FUNCTION Hotel mode 1:welcome logo 0:haier logo No use V_Mute ON/OFF when ＣＨ changes(=1:ON) AUDIO GAIN SW of tb1240 Not VT Down of AFT when No Signal(=1) TINT 0:use 1:unused Select TV sync(0) or MONITOR sync(1) Mute of av switch key 1.use 0.no use...
  • Page 15 ACL ST ???????? 0:Y peak limiter off 1:Y peak limiter on,105IRE No use DCBS FUNCTION BLACK STRETCH black strecth 00：Off；01：Black stretch point,26IRE; 10 : 33 IRE; 11 : 43 IRE Y GAMMA 00：Off；01：Y γ point 90 IRE,Gain –3dB; 10 : 82 IRE ; 11 : 75 IRE VCD BS SW VCD CORING VCD BLACK...
  • Page 16 FUNCTION UNUSE UNUSE Select window pulse for H lock detection Select H lock detection mode Select SY-DET-1 for sync dtection Select SY-DET-2 for sync dtection Select LPF mode for sync dtection UNUSE SYSR: FUNCTION UNUSE UNUSE Select window pulse for H lock detection Select H lock detection mode Select SY-DET-1 for sync dtection Select SY-DET-2 for sync dtection...
  • Page 17 1: SOFT CHANGE CHANNEL 0：no UNUSE VBLK FUNCTION 00:23H;01:33H;10:37H;11:41H (50Hz) 00:22H;01:30H;10:34H;11:38H (60Hz) 00:310H;01:299H;10:295H;11:291H (50Hz) 00:263H;01:254H;10:250H;11:246H (60Hz) MODE0: FUNCTION 1：218 channels；0：100 channels 1：5060 （M system） ；0：tow way AV 0： SECAM；1：no 1：RGB Out-Cut Off DC；0：Y-MUTE 1：ALWAYS DISPLAY SOME MENU；0：SOMETIMES DISPLAY SOME MENU 0：ALPS 1:panasionc SHOP OUT...

  • Page 18: Circuit Diagram

    FUNCTION lunar calendar 1:have lunar calendar ; 0:no lunar calendar No use 1：english 0：chinese AV WITH MUTE；1：yes；0：no No use 1：super incept 0：no No use 0：boot-strap welcome 1：no MOD： FUNCTION 00：*9.75;01:*10.00;10:*10.25;11:*10.50 CUTOFF SENSITI VITY MOD.3:0 CUTOFF range:-0.65~+0.65;1:-0.65~+0.85 000：NO；001：45.75；011：38.9；100：38.0 OSDA FUNCTION OSD CONTRAST 00:80 IRE 01:70;02:60;03:50;...
  • Page 19 21"-TSB-2IN1 Ref. Chassis(CQ0765) XP201 N301 AN7522N XS903 XP903 R128 2W12K C-IN +115V +33V C126 C125 N121 +12V C309 C310 R320 uPC574J 1000P R904 470u/25V 0.01u 1/2W-4.7K U101 XS801 10u 50V VD901 15K 2W 1N4148 BL301 C305 +5V-2 C306 R-10W8 4.7u C307 R305 XS301...

  • Page 21: Circuit Explanation

    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, I C bus control.
  • Page 22 AUDIO OUTPUT 2 TV OUTPUT 2100 SIF SIGNAL OUTPUT 1400 EXTERIOR AUDIO 2 5000 SIF SIGNAL INPUT AND LEVEL REVIS 1400 DC FEEDBACK 1500 PIF PLL 1100 +5 IF VCC 4000 S-REG 1400 AUDIO MON 5000 IF AGC IF GND 4500 IF INPUT 4500...
  • Page 23 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),.

  • Page 24: Maintenance Service And Trouble Shooting

    input 2.61 26.56 0.45 PUMP UP 2.21 ∞ 1.25 output 16.31 0.68 1.75 OUT VCC 26.87 2.95 reference 2.62 0.65 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.
  • Page 25 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 No light and sound Check to see if Fuse is normal Abnormal Normal Check to see 110V、180V...
  • Page 26 No raster Whether G2 voltage is normal Abnormal Normal Test filament voltage Test the base voltage of V431 Normal Abnormal Normal Abnormal Check to see if be Heater Resistor Check the circuit Check the voltage open voltage of V432 is from pin13 of N201 to of all pins of XS903 existed?
  • Page 27 Horizontal bright line 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 Check to see if voltage of pin6 at Check to see if the voltage of N401 is normal pin 15 and pin16 of N201 is normal...
  • Page 28 Picture exists but no sound Make C305/C306 open. Multimeter is at band RΧ1K. Red probe connect to ground. Touch No.6 OR No.8 of N301 with No noise Have noise Make C301 OR C302 collector Power amplifier is abnormal. open. Touch No.6 OR No.8 of V301 Inspect N301 and peripheral with black probe to see if noise components of N301...
  • Page 29 Troubleshooting Before calling service personnel, please check the following chart for a possible cause to the trouble you are experiencing. Symptom Check these things TV is not Be sure the power cord is plugged in. turned on The MUTE function may be used. Good picture , Adjust the volume of the TV set.
  • Page 30 Sincere Forever Haier Group Haier Industrial Park, No. 1, Haier Road 266101,Qingdao,China http://www.haier.com...