LG PT-43 Service Manual
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LG PT-43 Service Manual

LG PT-43 Service Manual

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COLOR TV

SERVICE MANUAL

CHASSIS : MP-00DA
MODEL : PT-43/48/53A80
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CH:
PRO LOGIC
PRO
LOGIC
DIGITAL INDEX
MOVIE SPORTS MUSIC
MOVIE SPOR
C
L
R
LS
RS
CATV
TV /
website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html

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Summary of Contents for LG PT-43

  • Page 1: Service Manual

    COLOR TV SERVICE MANUAL CHASSIS : MP-00DA MODEL : PT-43/48/53A80 CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. PRO LOGIC LOGIC DIGITAL INDEX MOVIE SPOR MOVIE SPORTS MUSIC CATV TV /...

  • Page 2: Table Of Contents

    CONTENTS Contents ......................2 Safety Precautions ..................3 Servicing Precautions ..................4 Specifications ....................6 Control Descriptions ..................8 Adjustment......................11 Troubleshooting .....................17 Block Diagram ....................25 Printed Circuit Board ..................28 Wiring Diagram....................39 Exploded View ....................40 Exploded View Parts List................41 Replacement Parts List ................46 SVC.

  • Page 3: Safety Precautions

    SAFETY PRECAUTIONS IMPORT ANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by 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 4: Servicing Precautions

    SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service transistors and semicounductor "chip" components. The manual and its supplements and addenda, read and follow the following techniques should be used to help reduce the SAFETY PRECAUTIONS on page 3 of this publication. incidence of component damage caused by static by static NOTE: If unforeseen circumstances create conflict between the electricity.
  • Page 5 c. Qulckly move the soldering iron tip to the junction of the Fuse and Conventional Resistor component lead and the printed circuit foil, and hold it Removal/Replacement there only until the solder flows onto and around both the 1. Clip each fuse or resistor lead at top of the circuit board component lead and the foil.

  • Page 6: Specifications

    SPECIFICATIONS NOTE : Specifications and others are subject to change without notice for improvement. Video input system: Tuning system : Multi 26 System (Refer to Table 1) 100 Program Memory Intermediate Frequency 200 Program Memory(CHINA Only) Vision IF : 38.9MHz Color IF : 34.47MHz [SECAM : 38.9-4.25MHz Sound output :...
  • Page 7 T able 1 : Receiving System (26 System) Receiving System Receiving Channel Function P P A A L L - - B B P P A A L L - - G G V V H H F F B B a a n n d d P P A A L L - - I I : : 2 2 - - 1 1 2 2 PAL/SECAM-B...

  • Page 8: Control Descriptions

    7. NUMBER BUTTONS switches the set on from standby or directly select a number. 8. PSM (Picture Status Memory) recalls your preferred picture setting. 9. VCR BUTTONS control a LG video cassette recorder. - 8 -...

  • Page 9: Power

    10. TV/AV selects TV or AV mode. clears the menu / text from the screen. switches the set on from standby. POWER 11. TURBO PICTURE BUTTON selects Turbo picture. I/II TV/AV TURBO 12. TELETEXT BUTTONS SOUND PICTURE These buttons are used for teletext. For further details, see the ‘Teletext’...

  • Page 10: Audio/Video In Sockets (Av3

    Front panel • PT-43A80 series DIGITAL INDEX MOVIE SPOR MOVIE SPORTS MUSIC TS MUSIC MENU CATV TURBO TV/AV DIGITAL INDEX MOVIE SPOR MOVIE SPORTS MUSIC TS MUSIC MENU CATV TURBO TV/AV POWER POWER • PT-48/53A80 series DIGITAL INDEX MOVIE SPOR MOVIE SPORTS MUSIC TS MUSIC MENU...

  • Page 11: Adjustment

    ) to reset the convergence. 1. Test Equipment Signal Generator can produce DOT pattern 2. Adjustment LG Convergence assy 2. Preliminary steps Make red raster using lens cover and coincide 1) Heat run over 60 minutes. horizontal/vertical center lines of pattern with those of 2) Pre-adjust Raster slope,Raster position &...

  • Page 12: Deflection Adjustment

    High Voltage Regulation Adjustment 4) VL (Vertical Linearity) Adjust so that the boundary line between upper and lower half is in accord with geometric horizontal center of the CPT. 1. Test Equipment Digital Multi-Meter(DMM) 5) SC (Vertical “S” Correction) Adjust so that all distance between each horizontal lines are 2.

  • Page 13: Convergence Adjustment

    Lens Focus & Electronic Focus Adjustment 1) Turn the lens until the chromatic aberration changed purple to green which of 3.5 Cross-Hatch part from picture's center toward left. 1. Preliminary steps 1) Electronic focus,Raster slope & Raster position must be pre- adjusted.

  • Page 14: White Balance Adjustment

    White Balance Adjustment 1. Test Equipment Brightness meter(CA110) The vertical center 2. Adjustment 1) This adjustment must be operated in a dark room or equivalent. 2) Adjust after Cut-Off and Focus adjustment. 3) The brightness meter must be located in 20!5 c m distance from the center of the screen.
  • Page 15 2. Deflection adjustment data (IC:VDP3130Y) Menu Description Range Default P PKG Green Peak Level 0~256 Default Menu Description Range NTSC P PKB Blue Peak Level 0~256 07FC P SAT Color Saturation 0~16 Vertical Shift 0600~0900 07DC 0085 0050~00CF P YPE Y Peaking Vertical Amp 0085...
  • Page 16 Range Description Default B2-VE 1: Use VDP3130Y B2 version 0: Not use B2 Version option3 B1-VE 1: Use VDP3130Y B1version 0: Not use B1 Version State Language Funciton Default 0:E Only English 1:English+CIS+R+P English/CIS/Romania/Poland 2:RESERVED English/Farsi 3:English+FARSI 4:English+Arab+URDU English/French/Arab+Urdu 5:English+Hindi English/Hindi 6:English+East-South Asia English/Indonesian/Malaysian/Vietnamese...

  • Page 17: Troubleshooting

    Trouble Shooting 1. NO PICTURE ( SOUND OK ) CVBS Signal ? Check MAIN1 Q026(E) Waveform. (2Vpp) Check around Waveform of AV Board Q200(E) ? Check Tuner(TU101) VIDEO output IC200 Waveform of AV Board IC202 #11 ? Check around IC201, 202 Waveform of MAIN1 IC501 #63 ? Check AV Board VQ202(E) Check around IC501 #37, #38, #39...
  • Page 18 2. NO SOUND (PICTURE OK) <AV1,2,3,SCART INPUT> < RF > Waveform of Waveform of AV Board IC7 01 Check Check JA202 Jack MAIN1 Q022(E) #47,48,50,51,53,54,56,57 TU101 ( SIF ) ? at each Mode ? Waveform of Check AV Board IC701 around #67 ? Q706...
  • Page 19 3. NO PIP <AV1,2,3> <RF> <SCART> Waveform of AV Board Waveform of PIP Waveform of MAIN1 IC200 #27,29,31 ? Board IC1201 #28 ? Q027(E) ? Check JA202 Waveform of AV Board Check AV Board IC200 #13 ? IC200, Q201 Check Scart Jack JA204 Waveform of PIP Board...
  • Page 20 4. NO Teletext (Picture OK) Waveform of MAIN1 IC501 #59 ? Check PIP Board Waveform of IC001 #12 ? IC1205 #2, #4 Check OPTION1 TEXT Code (SVC MODE) 5. NO OSD (ON SCREEN DISPLAY) Horizontal, Vertical Fly Back Input Waveform of MAIN1 IC001 #19,#20 ? Check DEF.
  • Page 21 6. NO POWER ON 6.1 MICOM PART CHECK Check input voltage of Check SMPS Board IC001#9,11,13,30,37,42,44 Check IC001 #34,35 Replace X001 (OSC) Replace Q003, Q004 Check IC001 #3, 4 (SCL,SDA) Check Abnormnal Circuit Check IC001 #46 (ABN) HIGH Check IC001 #24 ( IR ), Check P004AP connector #47~52 (Key In) - 21 -...
  • Page 22 7. NO VFD OPERATION Check AV Board IC750 #5 Check IC701sound output Sound signal. Check IC750 #3 output Check around IC750 Check IC001 #18, 21, 22 Check Q008, 007 Check IC001 #23, 25, 27 Check Q011, Q012 - 22 -...
  • Page 23 8.NO RASTER Check +B voltage at Pin1 of P805A. Normal Open Is the voltage at Check F801. Pin 15,17 of IC501 3.3V? Check/Replace Check 5V, 9V, F801, D802, 12V lines IC801,IC802. Does the square Check the voltage waveform from pin50 of C812(+).
  • Page 24 9.INCORRECT CONVERGENCE Does the static convergence correct? Incorrect Dynamic Incorrect Static Readjust static convergence Check the input voltage at by remote controller P201. Abnormal Controlled Normal Not controlled Check pulse pin 125 Check voltage on the Are there pulse signal of IC2051 (4MHz) SMPS PCB at pin 121 of IC2051...

  • Page 25: Block Diagram

    BLOCK DIAGRAM(SIGNAL) - 25 -...
  • Page 26 BLOCK DIAGRAM(DEF) - 26 -...
  • Page 27 BLOCK DIAGRAM(SMPS) - 27 -...

  • Page 28: Printed Circuit Board

    PRINTED CIRCUIT BOARD SIGNAL - 28 -...
  • Page 29 COMPONENT LOCATION GUIDE(SIGNAL) R110..B2 R520 ..D2 R588..F4 C001..A3 C073..F2 C517 ..D2 C620 ..D2 L100 ..D5 Q033 ..G5 R041..B4 R521 ..D2 R589 ..G3 C082..B4 C518 ..D2 C621 ..D2 L101 ..D5 Q034 ..G4 R043 ..C5 R111..B2 C002..A3 C519 ..D2 C628..E2 L102 ..E5 Q035 ..B2 R044 ..C4 R112 ..C2...
  • Page 30 MAIN2 (DEF) - 30 -...
  • Page 31 COMPONENT LOCATION GUIDE(DEF) R496..E2 T401..D1 G405 ..C2 G463 ..C4 J452..F1 Q413 ..E4 R429..E3 C301..E2 C457..F3 D437..F4 R430..B5 R497..E2 T402..D4 DF ..A3 G406 ..B2 G464 ..C4 J453 ..B3 Q416 ..C4 C302..E2 C460..E4 Q417 ..D2 R432..B3 R498 ..C5 T403 ..B4 C303..F2 C461 ..C5 DFGND ..A3 G407 ..B2 G465 ..B2...
  • Page 32 SMPS POWER SWITCH PRE-AMP - 32 -...
  • Page 33 CONV-OUT - 33 -...
  • Page 34 SIDE AV CONTROL - 34 -...
  • Page 35 VM (TOP) VM (BOTTOM) - 35 -...
  • Page 36 LG CONVERGENCE (TOP) LG CONVERGENCE (BOTTOM) - 36 -...
  • Page 37 SGS-THOMSON CONVERGENCE (TOP) SGS-THOMSON CONVERGENCE (BOTTOM) - 37 -...
  • Page 38 AV (TOP) AV (BOTTOM) - 38 -...

  • Page 39: Wiring Diagram

    WIRING DIAGRAM P204B SIDE A/V P03P PRE-AMP ANODE ANODE ANODE P903A P903B P904A P901B P902B P904B GND2R GND2G GND1B SCR1R SCR1G SCR1B GND1G GND5B "R" CRT PCB "G" CRT PCB "B" CRT PCB GND5G HV BLOCK " " CONTROL PWB FOCUS PACK P001B P801B...

  • Page 40: Exploded View

    EXPLODED VIEW(PT-43A80) - 40 -...

  • Page 41: Exploded View Parts List

    EXPLODED VIEW PARTS LIST The components identified by mark critical for safety. Replace only with part number specified. Part No. Description 3680V00007A LENS,SEKINOS SSM-75(50) 4810V00326C BRACKET,BLUE LENS+COUPLER+CRT ASSY 4810V00326B BRACKET,GREEN LENS+COUPLER+CRT ASSY 4810V00326A BRACKET,RED LENS+COUPLER+CPT ASSY 120-D38E SPEAKER,MID-RANGE 8 OHM 15/25W 87DB 120-237C SPEAKER,8OHM 15W/20W 6150Z-1000A...
  • Page 42 EXPLODED VIEW(PT-48A80) - 42 -...
  • Page 43 EXPLODED VIEW PARTS LIST The components identified by mark critical for safety. Replace only with part number specified. Part No. Description 3680V00007A LENS,SEKINOS SSM-75(50) 4810V00326C BRACKET,BLUE LENS+COUPLER+CRT ASSY 4810V00326B BRACKET,GREEN LENS+COUPLER+CRT ASSY 4810V00326A BRACKET,RED LENS+COUPLER+CPT ASSY 120-D38E SPEAKER,MID-RANGE 8 OHM 15/25W 87DB 6401VD0006C SPEAKER ASSY,WOOFER+TWEETER 6401VD0006D...
  • Page 44 EXPLODED VIEW(PT-53A80) - 44 -...
  • Page 45 EXPLODED VIEW PARTS LIST The components identified by mark critical for safety. Replace only with part number specified. Part No. Description 3680V00007A LENS,SEKINOS SSM-75(50) 4810V00326C BRACKET,BLUE LENS+COUPLER+CRT ASSY 4810V00326B BRACKET,GREEN LENS+COUPLER+CRT ASSY 4810V00326A BRACKET,RED LENS+COUPLER+CPT ASSY 120-D38E SPEAKER,MID-RANGE 8 OHM 15/25W 87DB 6401VD0006C SPEAKER ASSY,WOOFER+TWEETER 6401VD0006D...

  • Page 46: Replacement Parts List

    REPLACEMENT PARTS LIST LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION IC1206 0ISG111733B IC,LD1117V33C 3SIP ST REGULATOR IC2000 0ICTMSG001A IC,STV2050A SGS-THOMSON D830 0ISK100300A IC,SLA1003 SIP12 BK DIODE MODULE( IC,74HC14D 14SOP TP SHITTER TRIGG IC2001 0IPH741400E D836 0ISK100300A IC,SLA1003 SIP12 BK DIODE MODULE( IC2001 0ISA392120A IC,STK392-120 18P,SIP BK CONVERGE...
  • Page 47 LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION D003 0DD414809ED DIODE,1N4148 TA D801 0DD200009AH DIODE,RECTIFIER RU2AMV(1) TP SANKEN D004 0DD414809ED DIODE,1N4148 TA D802 0DD247109AA DIODE,DETECTOR 1S2471DETECT SW TP DIODE,1N4148 TA DIODE,1N4148 TA D005 0DD414809ED D802 0DD414809ED D006 0DD414809ED DIODE,1N4148 TA D803 0DD247109AA...
  • Page 48 LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION D970 0DD060009AC DIODE,TVR06J 0.6A/600V 250NS TP G.I ZD901R 0DZ560009CF DIODE,ZENER MTZJ5.6B TP ROHM-K DO34 0.5W 5 D971 0DD060009AC DIODE,TVR06J 0.6A/600V 250NS TP G.I ZD901G 0DZ560009CF DIODE,ZENER MTZJ5.6B TP ROHM-K DO34 0.5W 5 DIODE,TVR06J 0.6A/600V 250NS TP G.I D972 0DD060009AC...
  • Page 49 For Capacitor & Resistors, the CC, CX, CK, CN : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit CQ : Polyestor RS : Metal Oxide Film in the P/No. means as follows; CE : Electrolytic RN : Metal Film RF : Fusible LOCA.
  • Page 50 For Capacitor & Resistors, the CC, CX, CK, CN : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit CQ : Polyestor RS : Metal Oxide Film in the P/No. means as follows; CE : Electrolytic RN : Metal Film RF : Fusible LOCA.
  • Page 51 For Capacitor & Resistors, the CC, CX, CK, CN : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit CQ : Polyestor RS : Metal Oxide Film in the P/No. means as follows; CE : Electrolytic RN : Metal Film RF : Fusible LOCA.
  • Page 52 For Capacitor & Resistors, the CC, CX, CK, CN : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit CQ : Polyestor RS : Metal Oxide Film in the P/No. means as follows; CE : Electrolytic RN : Metal Film RF : Fusible LOCA.
  • Page 53 For Capacitor & Resistors, the CC, CX, CK, CN : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit CQ : Polyestor RS : Metal Oxide Film in the P/No. means as follows; CE : Electrolytic RN : Metal Film RF : Fusible LOCA.
  • Page 54 For Capacitor & Resistors, the CC, CX, CK, CN : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit CQ : Polyestor RS : Metal Oxide Film in the P/No. means as follows; CE : Electrolytic RN : Metal Film RF : Fusible LOCA.
  • Page 55 220P 50V K B TA52 C2054 0CE107SF6DC 100UF MVG 16V M SMD R/TP C1005 0CN2210K519 220P 50V K B TA52 C2056 0CE105SK6DC 1UF MVG 50V M *LG C1006 0CN1040K949 0.1M 50V Z F TA52 “ 0CE107SF6DC 100UF MVG 16V M *THOMSON C1007 0CE475DK618 4.7UF STD 50V 20% FL TP 5...
  • Page 56 For Capacitor & Resistors, the CC, CX, CK, CN : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit CQ : Polyestor RS : Metal Oxide Film in the P/No. means as follows; CE : Electrolytic RN : Metal Film RF : Fusible LOCA.
  • Page 57 For Capacitor & Resistors, the CC, CX, CK, CN : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit CQ : Polyestor RS : Metal Oxide Film in the P/No. means as follows; CE : Electrolytic RN : Metal Film RF : Fusible LOCA.
  • Page 58 For Capacitor & Resistors, the CC, CX, CK, CN : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit CQ : Polyestor RS : Metal Oxide Film in the P/No. means as follows; CE : Electrolytic RN : Metal Film RF : Fusible LOCA.
  • Page 59 For Capacitor & Resistors, the CC, CX, CK, CN : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit CQ : Polyestor RS : Metal Oxide Film in the P/No. means as follows; CE : Electrolytic RN : Metal Film RF : Fusible LOCA.
  • Page 60 For Capacitor & Resistors, the CC, CX, CK, CN : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit CQ : Polyestor RS : Metal Oxide Film in the P/No. means as follows; CE : Electrolytic RN : Metal Film RF : Fusible LOCA.
  • Page 61 For Capacitor & Resistors, the CC, CX, CK, CN : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit CQ : Polyestor RS : Metal Oxide Film in the P/No. means as follows; CE : Electrolytic RN : Metal Film RF : Fusible LOCA.
  • Page 62 For Capacitor & Resistors, the CC, CX, CK, CN : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit CQ : Polyestor RS : Metal Oxide Film in the P/No. means as follows; CE : Electrolytic RN : Metal Film RF : Fusible LOCA.
  • Page 63 For Capacitor & Resistors, the CC, CX, CK, CN : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit CQ : Polyestor RS : Metal Oxide Film in the P/No. means as follows; CE : Electrolytic RN : Metal Film RF : Fusible LOCA.
  • Page 64 For Capacitor & Resistors, the CC, CX, CK, CN : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit CQ : Polyestor RS : Metal Oxide Film in the P/No. means as follows; CE : Electrolytic RN : Metal Film RF : Fusible LOCA.
  • Page 65 CE : Electrolytic RN : Metal Film RF : Fusible LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION ACCESSORIES MANUAL,OWNERS NEU LG EN 049P TX 3828VA0234A 6710V00049P REMOTE CONTROLLER 6710V00049X REMOTE CONTROLLER W/O TXT MISCELLANEOUS 180-836E FOCUS,PACK201-115A011 304-105A...
  • Page 66 P/NO: 3854VA80A (MAIN1/VFD/PIP) DATE: 2000.11.30...
  • Page 67 P/NO: 3854VA80B (SMPS/DEF/CPT/VM) DATE: 2000.11.30...
  • Page 69 Oct., 2000 P/NO : 3828VD0080A Printed in Korea...

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