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Haier HTR20-A Service Manual

Tmpa8873pscng
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HTR20-A
(TMPA8873PSCNG)
All rights reserved. Unauthorized copying and distribution is a
violation of law.
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Summary of Contents for Haier HTR20-A

  • Page 1 HTR20-A (TMPA8873PSCNG) 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 21T07 FUNCTION 21T07 ITEM ITEM × PICTURE Main IC TMPA8873PSCNG 24 SOFTWARE Digital curtain × flat Slow fading on & off √ Color system NTSC+ATSC Semitransparent menu √ Audio system Non-flshing channel changing √ NO.of channels ZOOM √...

  • Page 4: Waining

    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

    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 : 1.181 channels C bus control 3.Auto scan 4.Audio/video input/output interfaces 5.Multiple picture modes selection 6.Blue screen 7 NTSC + ATSC 8.CCD 9.SLEEP TIMER 10.Q.VIEW 11.V-CHIP 12.ARC(LETTERBOX/ZOOM / FULL) 4. Adjustment A..Factory adjustment information Specific operation: use remote controller Press “MENU”...
  • Page 12 HPOS-D DTV Horizontal shift VPOS-D DTV Vertical shift VSC-D DTV S emendation 00：-12% VLIN-D DTV Vertical slop 10： 0% 1F：12% DTV Vertical amplitude HIT-D 0： -22mV， Input DC DTV-UB Bit 3,2,1,0:DTV U BLK ADJ 8： 0mV F： 19mV， 2.75mV/dev 0： -22mV， Input DC Bit 3,2,1,0:DTV V BLK ADJ DTV-VB 8：...
  • Page 13 NTSC) 1：On Bit 4:Demodulation Phase 00：PAL 01：NTSC1(93 deg)JAPAN 10：NTSC2 (108 deg)USA 11：DVD Bit 2,1,0:Y Delay Time 000： 0ns 001： 40ns 010： 80ns 011： 120ns 100： 160ns 101： 200ns 110： 240ns 111： 280ns Chroma data ( VIDEO ) CLVO Chroma data ( DTV/YUV ) CLVD Bit 3,2,1,0:S Trap f0 For M 0000：...
  • Page 14 DCBS-D 0：LOW Bit 7:C Trap Q _Y 1：High Bit 6:Blanking switch 0：H，V blanking on 1：H，V blanking off Bit 5:Y Coring SW 0：OFF 1：ON Bit 4:Blank Strech SW 0：OFF 1：ON Bit 3:Y GAMMA 00：off 01：Y point 78IRE，Gain -6dB 10：68IRE 11：58IRE Bit 1:Blank Strech 00：Black strech point=30IRE 01：40IRE 10：50IRE 11：75IRE...
  • Page 15 11： OFF Bit4:AFC Fix NOIS Bit 3-0:Compare to NOISE DET Bit 7-2:No use Data Description Bit 1,0:AFC GAIN Data Description Blanking period Picture period HAFD 00： 2 01： 4 10： 2/3 11： OFF Bit 7:VCO readjust when position 0：disable， 1：enable select 00：BPF （AV）01：TOF1（F0=5MHZ）...
  • Page 16 01 ：2.2Vp-p Bit5,4:PIF_DET_LVL 00：2.1Vp-p ：2.3Vp-p 11：2.4Vp-p Bit3,2:FM BPF 00： internal BPF mode 01： not use 10： not use 11： external BPF mode Bit1,0:Nouse MENU06 Bit2: H sync judgement 0：BUS 1：TC3 SYNC Bit1:sync_sep level 0：40% 1：50% Bit0:Sync slice level for weak signal 0：normal 1：low for weak signal Sync detection setting for BB On...
  • Page 17 NDTC NOISE DET count (Weak -> Normal) RAGC RF-AGC 00-07 MENU07 Bit7-4:TDA9850 A05 D3-0 AUCON1 CON2_noise threshold for SAP_SP3,SP2,SP1,SP0 Bit3-0:TDA9850 A04 D3-0 CON1_noise threshold for STEREO_ST3,ST2,ST1,ST0 Bit4:TDA9850 A09 D7 ALI2_Stereo AUCON2 level switch_STS_1: STon < 35mV; 0: Ston < 30mV. Bit3-0:TDA9850 A07 D3-0 CON4_input level adjustment_L0 to TDA9850 A08 D4-0_ALI1_for...
  • Page 18 BRTX-D DTV brightness max Bit3:DTV one part number input(no 0: ATV 1: DTV signal ) DTV-OPT1 Bit2:ARC 1: G2 side, 0: DLV side Bit1:RRT Update 1： Yes； 0： No Bit0:PAT, PMT Update 1： Yes； 0： No DTV-OPT2 MENU10 CNTX contrast max CNTC contrast center CNTN...
  • Page 19 EJTAG BTSC-SW MENU16 Bit 7:Fjp_dmode OPTM1 0： JP D mode， 1： Haier D Mode Bit 6:Frestart_mode 0: No error deal if DLV abnormal, 1：Deal Bit 5:Screen Format mute control 0: control by DLV 1： control by G2 (150ms) Bit 4:ABL control...
  • Page 20 Bit 3:Fmonitor_sync 0： TV-OUT， 1： Varia-OUT Bit 2:Nouse Bit 1:Local Key 0： TSB Local key， 1： Haier local key Bit 0:Fjp_stereo 0： Mono mode， 1： stereo mode Bit 7:ALC ON/OFF mute 0：none 1：on Bit 6:TINT polarity ，input to V/C/D.

  • Page 21: Wiring Connection Diagram

    5. WIRING CONNECTION DIAGRAM KEY BOARD 6. Circuit Explanation 1、Microprocessor and Small signal processing: super monolithic integrated circuits ： TMPA8873PSCNG TMPA8873PSCNG is an integrated circuit decoder, containing intermediate image amplifying, horizontal and vertical scan, small signal processing, color decoding, C bus control. Information introducing functions and testing data for maintenance is listed in Table 1.
  • Page 22 ∞ SCP-OUT 1.08 H-OUT 2.16 0.66K ∞ H.AFC ∞ V-SAW 4.15 V-OUT 24.1K H-VCC 8.23 0.9K 0.003 0.8Ω ∞ ∞ Y-IN ∞ EXT_AU_1 3.46 103K C-IN 0.01 101Ω ∞ EXT-IN ALC-FILTER 0.005 3.6M ∞ TV-IN ABCL-IN 4.86 28.5K ∞ AV_OUT_1 3.18 AV_OUT_2 3.18...
  • Page 23 SCL0 4.93 12.6K ATV/DTV 0.008 POWER 4.42 DONAU LV WAKE UP 2.89 6.4K DONAU LV RESET 12.25K RMT-IN 0.85 133.6M DVD_POWER 0.02 12.8K 2.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 U101, are processed for tuning and high frequency amplifying and mixing, then an analog IF signal will go through the sound surface wave filter.

  • Page 24: Maintenance Service And Trouble Shooting

    ∞ PUMP UP OUTPUT Flyback generator 2.24 Ground or negative supply 0.003 V.Output Output 13.66 ∞ output stage supply Output stage supply 26.7 NOV INV.IN Non-inverting input 2.46 5.Analysis of horizontal sync and horizontal scan output circuits As the horizontal oscillation circuit is installed inside N201 (TMPA8873PSCNG), . 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 A3. Error Detection Process No light and sound Check to see if Fuse is normal Abnormal Normal Check to see 110V、180V Check VD603~VD606, etc. voltage is normal C607, N601etc. Normal Abnormal Check to see if the T est to see all terminal collector voltage of Resistance of load VD622 is 24V...
  • Page 26 No raster Whether G2 voltage is normal Abnormal Normal Test filament voltage Test the base voltage of V432 Normal Abnormal Normal Abnormal Heater Resistor Check to see if be Check the circuit Check the voltage open voltage of V431 is from pin15 ofN201 to of all pins of XZ601 existed?
  • Page 27 Horizontal bright line Make R401 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 pin2 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 C301/C302 open. Multimeter is at band RΧ1K. Red probe connect to ground. Touch No.1 OR No.9 of N301 with No noise Have noise Make C301 OR C302 collector Power amplifier is abnormal. open. Touch No.1 OR No.9 of Inspect N301 and peripheral N301 with black probe to see if components of N301...

  • Page 29: Troubleshooting

    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 TELS Donau LV+TMPA8873 Ref-Chassis for Haier Ver :3.0 TO CRT BOARD XS201 U201 Donau LV 7P-2.54 HVCC VD283 R282 V281 V282 HVCC 2SC2878A 2SC2878A Z101 HZ3.3V R283 U101 TUNER W222 XS806 45.75MHz W223 TDQU2 R280 VD281 HZ6.2V VD282 L103 HZ6.2V...

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