JVC LT-20DJ5SGE Service Manual
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JVC LT-20DJ5SGE Service Manual

JVC LT-20DJ5SGE Service Manual

Lcd panel television
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SERVICE MANUAL
6
2006
YA437
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
LCD PANEL TELEVISION
LT-20DJ5SGE,
LT-20DJ5SFR,
LT-20DJ5SSP

TABLE OF CONTENTS

COPYRIGHT © 2006 Victor Company of Japan, Limited
Preliminary
No.YA437
2006/6

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  • Page 1: Table Of Contents

    SERVICE MANUAL LCD PANEL TELEVISION YA437 2006 LT-20DJ5SGE, LT-20DJ5SFR, LT-20DJ5SSP TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS .
  • Page 2 SPECIFICATION Items Contents Dimensions ( W × H × D ) 53.0cm × 47.7cm × 21.3cm [Included stand] 53.0cm × 44.0cm × 12.5cm [TV only] Mass 8.2kg [Included stand] 7.2kg [TV only] Power Input ADAPTER AC100 - 240V, 50Hz DC12V Power Consumption 60W (Standby: 3.0W) TV RF System...

  • Page 3: Precaution

    SECTION 1 PRECAUTION SAFETY PRECAUTIONS [EXCEPT FOR UK] (1) The design of this product contains special hardware, (6) Isolation Check (Safety for Electrical Shock Hazard) many circuits and components specially for safety After re-assembling the product, always perform an purposes. For continued protection, no changes should be isolation check on the exposed metal parts of the cabinet made to the original design unless authorized in writing by (antenna terminals, video/audio input and output terminals,...
  • Page 4 INSTALLATION 1.2.1 HEAT DISSIPATION 1.2.3 NOTES ON HANDLING If the heat dissipation vent behind this unit is blocked, cooling (1) WHEN TAKING UNIT OUT OF A PACKING CASE efficiency may deteriorate and temperature inside the unit will When taking the unit out of a packing case, do not grasp rise.
  • Page 5 HANDLING LCD PANEL 1.3.1 PRECAUTIONS FOR TRANSPORTATION 1.3.2 OPTICAL FILTER (ON THE FRONT OF THE LCD PANEL) When transporting the unit, pressure exerted on the internal LCD (1) Avoid placing the unit under direct sunlight over a panel due to improper handling (such as tossing and dropping) prolonged period of time.

  • Page 6: Specific Service Instructions

    SECTION 2 SPECIFIC SERVICE INSTRUCTIONS FEATURES DVB-T (DIGITAL TERRESTRIAL BROADCASTING) ZOOM This TV can receive both Digital terrestrial broadcasting (DVB- This function can change the screen size according to the T) and Analogue terrestrial broadcasting. picture aspect ratio. T-V LINK OFF TIMER When you have a T-V LINK compatible VCR connected to the This function can set the TV to automatically turn off after a set...
  • Page 7 TECHNICAL INFORMATION 2.3.1 LCD PANEL This unit uses the flat type panel LCD (Liquid Crystal Display) panel that occupies as little space as possible, instead of the conventional CRT (Cathode Ray Tube), as a display unit. Since the unit has the two polarizing filter that are at right angles to each other, the unit adopts "normally black" mode, where light does not pass through the polarizing filter and the screen is black when no voltage is applied to the liquid crystals.

  • Page 8: Disassembly

    SECTION 3 DISASSEMBLY DISASSEMBLY PROCEDURE NOTE: • Make sure that the power cord is disconnected from the outlet. • Pay special attention not to break or damage the parts. • When removing each board, remove the connectors as required. • Taking notes of the connecting points (connector numbers) makes service procedure manageable. •...
  • Page 9 HANDLE BACK COVER CARD SLOT SIDE CONTROL PWB DOOR FUNCTION BUTTON AV JACK PWB INVERTER UNIT METAL HANG MAIN PWB BACK DOOR CABLE BRACKET SOCKET HOLDER COVER LED PWB LCD PANEL UNIT HINGE COVER DISPLAY SUPPORT FOOT TOP COVER LED LENS SPEAKER FRONT COVER FOOT ASSEMBLY...
  • Page 10 MEMORY IC REPLACEMENT • This model uses the memory IC. • This memory IC stores data for proper operation of the video and drive circuits. • When replacing, be sure to use an IC containing this (initial value) data. 3.2.1 SETTINGS OF FACTORY SHIPMENT 3.2.1.1 BUTTON OPERATION 3.2.1.2...
  • Page 11 REPLACEMENT OF CHIP COMPONENT 3.3.1 CAUTIONS (1) Avoid heating for more than 3 seconds. (2) Do not rub the electrodes and the resist parts of the pattern. (3) When removing a chip part, melt the solder adequately. (4) Do not reuse a chip part after removing it. 3.3.2 SOLDERING IRON (1) Use a high insulation soldering iron with a thin pointed end of it.

  • Page 12: Adjustment

    SECTION 4 ADJUSTMENT ADJUSTMENT PREPARATION 4.2.2 HOW TO EXIT THE SERVICE MODE Press the [MENU] key to exit the Service mode. (1) There are 2 ways of adjusting this TV : One is with the REMOTE CONTROL UNIT and the other is the conventional method using 4.2.3 CHANGE AND MEMORY OF SETTING VALUE adjustment parts and components.

  • Page 13: Troubleshooting

    4.2.5 SERVICE MODE SETTING ITEMS Setting menu Setting items Setting menu Setting items Adjust Group Option 2 Carrier Mode LDLY Col Temp Contrast Other Brightness Colour Osdclk_Dly Sharpness Osdclk_pinDly Green Aps Wss Test Programme Blue Aps Volume Scart Volume Avl Off Option 1 First APS Pdc Format 1...
  • Page 14 Victor Company of Japan, Limited Flat Panel Display Category 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan (No.YA437) Printed in Japan...
  • Page 15 Preliminary LT-20DJ5SGE LT-20DJ5SFR LT-20DJ5SSP STANDARD CIRCUIT DIAGRAM NOTE ON USING CIRCUIT DIAGRAMS 1.SAFETY Type No indication : Ceramic capacitor The components identified by the symbol and shading are : Metalized mylar capacitor critical for safety. For continued safety replace safety ciritical : Polypropylene capacitor components only with manufactures recommended parts.
  • Page 16 AV & HEADPHONE PWB CIRCUIT DIAGRAM ..................2-34 PATTERN DIAGRAMS MAIN PWB PATTERN ..........................2-35 SIDE CONTROL PWB PATTERN ......................2-39 AV & HEADPHONE PWB PATTERN ......................2-39 USING P.W. BOARD P.W.B ASS’Y name LT-20DJ5SGE LT-20DJ5SFR LT-20DJ5SSP MAIN P.W. BOARD VE-20267685 SIDE CONTROL P.W. BOARD VE-20224821 AV &...

  • Page 17: Wiring Diagram

    WIRING DIAGRAM (No.YA437)2-3 2-4(No.YA437)

  • Page 18: Block Diagram [Tv Part]

    BLOCK DIAGRAM [TV PART] +12V CARD +12V To STi5518 PL301 Serial Interface RX,TX,IRQ IR_IN 3.3V CONTROLLER 2.5V Power Supply KEYPAD SDA5550M 1.8V PL302 CARD SDRAM MENU S+5V PROM S3.3V S2.5V SOURCE S1.8V POWER GENERATOR MC14 CVBS IF SCALER R(0-7) BT656 VIDEO B(0-7) DEINTERLACER...

  • Page 19: Block Diagram [Idtv Part]

    BLOCK DIAGRAM [IDTV PART] DIGITAL DIGITAL FRONTEND TUNER ST0360 FC_DATA(0-7) FC_CLK FC_SYNC FC_VALID +12V EMI DRAM 3.3V FROM 2.5V POWER (0-14) 1.8V CPU_ SUPPLY DATA S+5V CARD (0-7) Serial Interface RX,TX,IRQ INTERFACE S3.3V CONTROLLER STV0700 CMD(0-7) TO SDA 5550 CONTROLLER S2.5V &...

  • Page 20: Circuit Diagrams

    CIRCUIT DIAGRAMS MAIN PWB CIRCUIT DIAGRAM (1/12) SHEET1 MAIN PWB ASS'Y(1/12) VE-20267685 c17mb16p-2_0602_1/12_0.0 (No.YA437)2-9 2-10(No.YA437)
  • Page 21 MAIN PWB CIRCUIT DIAGRAM (2/12) SHEET 2 MAIN PWB ASS'Y(2/12) VE-20267685 c17mb16p-2_0602_2/12_0.0 (No.YA437)2-11 2-12(No.YA437)
  • Page 22 MAIN PWB CIRCUIT DIAGRAM (3/12) SHEET 3 MAIN PWB ASS'Y(3/12) VE-20267685 c17mb16p-2_0602_3/12_0.0 (No.YA437)2-13 2-14(No.YA437)
  • Page 23 MAIN PWB CIRCUIT DIAGRAM (4/12) SHEET 4 MAIN PWB ASS'Y(4/12) VE-20267685 c17mb16p-2_0602_4/12_0.0 (No.YA437)2-15 2-16(No.YA437)
  • Page 24 MAIN PWB CIRCUIT DIAGRAM (5/12) SHEET 5 MAIN PWB ASS'Y(5/12) VE-20267685 c17mb16p-2_0602_5/12_0.0 (No.YA437)2-17 2-18(No.YA437)
  • Page 25 MAIN PWB CIRCUIT DIAGRAM (6/12) SHEET 6 MAIN PWB ASS'Y(6/12) VE-20267685 c17mb16p-2_0602_6/12_0.0 (No.YA437)2-19 2-20(No.YA437)
  • Page 26 MAIN PWB CIRCUIT DIAGRAM (7/12) SHEET 7 MAIN PWB ASS'Y(7/12) VE-20267685 c17mb16p-2_0602_7/12_0.0 (No.YA437)2-21 2-22(No.YA437)
  • Page 27 MAIN PWB CIRCUIT DIAGRAM (8/12) SHEET 8 MAIN PWB ASS'Y(8/12) VE-20267685 c17mb16p-2_0602_8/12_0.0 (No.YA437)2-23 2-24(No.YA437)
  • Page 28 MAIN PWB CIRCUIT DIAGRAM (9/12) SHEET 9 MAIN PWB ASS'Y(9/12) VE-20267685 c17mb16p-2_0602_9/12_0.0 (No.YA437)2-25 2-26(No.YA437)
  • Page 29 MAIN PWB CIRCUIT DIAGRAM (10/12) SHEET 10 MAIN PWB ASS'Y(10/12) VE-20267685 c17mb16p-2_0602_10/12_0.0 (No.YA437)2-27 2-28(No.YA437)
  • Page 30 MAIN PWB CIRCUIT DIAGRAM (11/12) SHEET 11 MAIN PWB ASS'Y(11/12) VE-20267685 c17mb16p-2_0602_11/12_0.0 (No.YA437)2-29 2-30(No.YA437)
  • Page 31 MAIN PWB CIRCUIT DIAGRAM (12/12) SHEET 12 MAIN PWB ASS'Y(12/12) VE-20267685 c17mb16p-2_0602_12/12_0.0 (No.YA437)2-31 2-32(No.YA437)

  • Page 32: Side Control Pwb Circuit Diagram

    AV & HEADPHONE PWB CIRCUIT DIAGRAM SHEET14 SIDE CONTROL PWB CIRCUIT DIAGRAM SHEET13 SIDE CONTROL PWB ASS'Y VE-20224821 AV & HEADPHONE PWB ASS'Y VE-20242334 (No.YA437)2-33 2-34(No.YA437)

  • Page 33: Pattern Diagrams

    PATTERN DIAGRAMS MAIN PWB PATTERN [SOLDER SIDE] (No.YA437)2-35 2-36(No.YA437)
  • Page 34 MAIN PWB PATTERN [PARTS SIDE] (No.YA437)2-37 2-38(No.YA437)

  • Page 35: Side Control Pwb Pattern

    SIDE CONTROL PWB PATTERN AV & HEADPHONE PWB PATTERN (No.YA437)2-39...
  • Page 36 PARTS LIST Preliminary CAUTION The parts identified by the symbol are important for the safety . Whenever replacing these parts, be sure to use specified ones to secure the  safety. The parts not indicated in this Parts List and those which are filled with lines --- in the Parts No. columns will not be supplied. P.W.
  • Page 37 MAIN P.W. BOARD ASS'Y (VE-20267685) ....................... 3-6 SIDE CONTROL P.W. BOARD ASS'Y (VE-20224821) ................... 3-13 AV JACK P.W. BOARD ASS'Y (VE-20242334) ....................3-13 PRINTED WIRING BOARD PARTS LIST [LT-20DJ5SGE] ..................3-14 MAIN P.W. BOARD ASS'Y (VE-20267685) ..................... 3-14 SIDE CONTROL P.W. BOARD ASS'Y (VE-20224821) ................... 3-14 AV JACK P.W.

  • Page 38: Exploded View Parts List -1

    EXPLODED VIEW PARTS LIST -1  Ref.No. Part No. Part Name Description Local VE-20242970 FRONT COVER  VE-20181267 LOGO JVC  VE-20233912 LED LENS  VE-20102039 IR LENS VE-30030145 SPEAKER 8ohm 5W 3x10cm(x2) VE-40024101 RUBBER BUSH (x4) VE-30040893 INVERTOR UNIT ...

  • Page 39: Exploded View -1

    EXPLODED VIEW -1 3-4(No.YA437)

  • Page 40: Exploded View -2

    EXPLODED VIEW -2 LCD PANEL UNIT INVERTER UNIT MAIN PWB PL801 PL704 PL703 PL702 SIDE PL306 CONTROL PL303 PL302 PL707 LED PWB PL100 PL101 SPEAKER SPEAKER AV JACK PWB (No.YA437)3-5...

  • Page 41: Printed Wiring Board Parts List [Lt-20Dj5Sfr]

    PRINTED WIRING BOARD PARTS LIST [LT-20DJ5SFR] MAIN P.W. BOARD ASS'Y (VE-20267685) Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local Q902 VE-30001454 TRANSISTOR Q903 VE-30001457 TRANSISTOR IC100 VE-30033063 Q904 VE-30007798 TRANSISTOR IC101 VE-30047934 Q905 VE-30007798 TRANSISTOR...
  • Page 42 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C114 VE-30016654 CAPACITOR 100nF 16V K C319 VE-30000371 E CAPACITOR 22uF 50V M C115 VE-30000371 E CAPACITOR 22uF 50V M C320 VE-30016654 CAPACITOR 100nF 16V K C116 VE-30016654 CAPACITOR...
  • Page 43 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C614 VE-30016654 CAPACITOR 100nF 16V K C787 VE-30020694 CAPACITOR 1uF 16V Z C615 VE-30012569 CAPACITOR 33pF 50V J C788 VE-30020694 CAPACITOR 1uF 16V Z C616 VE-30000074 CAPACITOR...
  • Page 44 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local C1128 VE-30016654 CAPACITOR 100nF 16V K C1474 VE-30012581 CAPACITOR 1nF 50V K C1129 VE-30016654 CAPACITOR 100nF 16V K C1475 VE-30000352 E CAPACITOR 100uF 16V M C1130 VE-30016654 CAPACITOR...
  • Page 45 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R153 VE-30012641 RESISTOR 1/16W 10K J R359 VE-30012659 RESISTOR 1/16W 2.2K J R154 VE-30012641 RESISTOR 1/16W 10K J R360 VE-30012506 RESISTOR 1/16W 1.5K J R155 VE-30012641 RESISTOR...
  • Page 46 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R610 VE-30012695 RESISTOR 1/16W 470R J R780 VE-30012641 RESISTOR 1/16W 10K J R611 VE-30012641 RESISTOR 1/16W 10K J R784 VE-30000464 RESISTOR 1/10W 100R J R612 VE-30012692 RESISTOR...
  • Page 47 Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local R1231 VE-30012702 RESISTOR 1/16W 560R J L106 VE-30020896 FERRITE R1232 VE-30012702 RESISTOR 1/16W 560R J L107 VE-30001971 FERRITE R1233 VE-30012692 RESISTOR 1/16W 4.7K J L108 VE-30020896 FERRITE...

  • Page 48: Side Control P.w. Board Ass'y (Ve-20224821)

    AV JACK P.W. BOARD ASS'Y (VE-20242334) Ref No. Part No. Part Name Description Local Ref No. Part No. Part Name Description Local L1103 VE-30017143 FIXED COIL 22uH J L1106 VE-30001971 FERRITE D100 VE-30016020 DIODE L1107 VE-30000710 RESISTOR 1/10W 47R J L1108 VE-30001971 FERRITE...

  • Page 49: Printed Wiring Board Parts List [Lt-20Dj5Sge]

    PRINTED WIRING BOARD PARTS LIST [LT-20DJ5SGE] MAIN P.W. BOARD ASS'Y (VE-20267685) REFER TO PARTS LIST IN PAGE 3-6 FOR THIS P.W. BOARD. SIDE CONTROL P.W. BOARD ASS'Y (VE-20224821) REFER TO PARTS LIST IN PAGE 3-13 FOR THIS P.W. BOARD. AV JACK P.W. BOARD ASS'Y (VE-20242334) REFER TO PARTS LIST IN PAGE 3-13 FOR THIS P.W.

  • Page 50: Printed Wiring Board Parts List [Lt-20Dj5Ssp]

    PRINTED WIRING BOARD PARTS LIST [LT-20DJ5SSP] MAIN P.W. BOARD ASS'Y (VE-20267685) REFER TO PARTS LIST IN PAGE 3-6 FOR THIS P.W. BOARD. SIDE CONTROL P.W. BOARD ASS'Y (VE-20224821) REFER TO PARTS LIST IN PAGE 3-13 FOR THIS P.W. BOARD. AV JACK P.W. BOARD ASS'Y (VE-20242334) REFER TO PARTS LIST IN PAGE 3-13 FOR THIS P.W.

  • Page 51: Packing

    PACKING PACKING PARTS LIST  Ref.No. Part No. Part Name Description Local VE-50087314 CARTON BOX LT-20DJ5SFR VE-50087320 CARTON BOX LT-20DJ5SGE VE-50087317 CARTON BOX LT-20DJ5SSP VE-20235217 CUSHION ASSEMBLY 2pcs in 1set VE-30044649 REMOTE CONTROL UNIT RM-C1897C ------------ BATTERY AA/R6 type(x2) ...

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