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Hitachi L42X02A Service Manual

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Be sure to read this manual before servicing. To assure safety from fire, electric shock, injury harmful radiation
and materials, various measures are provided in this Hitachi LCD TV.
Be sure to read the cautionary items described in the manual to maintain safety before servicing.
1. Do not attempt to modify this product in any way and never perform customized installations without manu-
facturer's approval. Unauthorized modifications will not only void the warranty,but may lead to your being
liable for any resulting property damage or user injury.
Service work should be performed only after you are thoroughly familiar with all of the following safety che-
2.
cks and servicing guidelines. To do otherwise,increase the risk of potential hazards and injury to the user.
While servicing,use an isolation transformer for protection from A.C. line shock.
3.
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SAFETY NOTICE.................................................2-4
PRODUCT SPECIFICATIONS.................................5
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FUNCTIONAL OVERVIEW...................................6-8
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CONNECTIONS........................................................9
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WIRING DIAGRAM ........................................10-11
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SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
Jun. 2008
Service warning
Contents
LCD Television
Digital Media Systems Group, Hitachi Asia Ltd.
L42X02A
Caution
*
PCB DIAGRAMS......................................................12-15
BLOCK DIAGRAM..........................................16-18
*
SCHEMATIC DIAGRAMS....................................19-39
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TROUBLESHOOTING........................................40-44
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REPLACEMENT PART LIST........................................46-63
*
0029E

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  Summary of Contents for Hitachi L42X02A

  • Page 1: Table Of Contents

    Be sure to read this manual before servicing. To assure safety from fire, electric shock, injury harmful radiation and materials, various measures are provided in this Hitachi LCD TV. Be sure to read the cautionary items described in the manual to maintain safety before servicing.
  • Page 2: Safety Notice

    SAFETY NOTICE PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS SUBJECT GRAPHIC SYMBOLS CAUTION: DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY AND N E V E R P E R F O R M C U S T O M I Z E D I N S T A L L AT I O N S W I T H O U T THE LIGHTNING FLASH WITH APROWHEAD SYMBOL.
  • Page 3: Important Safety Instructions

    Important Safety Instructions Read Instructions - All the safety and operating appliance dealer or local power company. instructions should be read before the product Power Cord Protection - Power cords should be is operated. routed so that they are not likely to be walked Retain Instructions - The safety and operating on or pinched by items placed upon or against instructions should be retained for future...
  • Page 4 adjustment of other controls may result in Installation Location - Place the product on a damage and will often require extensive fi rm and fl at surface. Avoid placing the product work by a service technician to restore the in areas of direct sunlight, heating radiators, product to its normal operation.
  • Page 5: Product Specifications

    PRODUCT SPECIFICATIONS 97.5 27.1 21.7 PAL, SECAM, NTSC3.58, NTSC4.43, PAL M, PAL N, PAL 60...
  • Page 6: Functional Overview

    FUNCTIONAL OVERVIEW Front Panel Side Panel Rear Panel...
  • Page 7: Remote Control

    Remote Control...
  • Page 9: Connections

    CONNECTIONS Connect via HDMI (HDMI) (DVI) [Example] Connect via Component Video DVD Player Set-Top Box Connect via S-Video Game Console Camcorder Connect via Composite Video Connect via RGB [Example] Computer [Example] Connect amplifier/subwoofer Audio Equipment Subwoofer...
  • Page 10: Wiring Diagram

    WIRING DIAGRAM CON22...
  • Page 12: Pcb Diagrams

    PCB DIAGRAMS FUNCTION BUTTON BOARD DIAGRAM RMC BOARD DIAGRAM AV BOARD DIAGRAM...
  • Page 13 LED BOARD DIAGRAM SWITCH BOARD DIAGRAM...
  • Page 14 MAIN BOARD DIAGRAM (TOP)
  • Page 15 MAIN BOARD DIAGRAM (BOTTOM)
  • Page 16: Block Diagram

    BLOCK DIAGRAM VIDEO BLOCK DIAGRAM TV TUNER CVBS 24MHz STB-6B/235S LCD PANEL PC-R IN SVP-QX68 16MX16X4 DDR2 PC-G IN PC-B IN PC-HS IN U4 FLASH K8P3215UQB PC-VS IN MCU RXD1 MCU TXD1 61P7RN440WT SCL MST1 S.VIDEO SDA MST1 CVBS1 CVBS2 HDMI1 RXC- RXC+...
  • Page 17: Block Diagram

    AUDIO BLOCK DIAGRAM TV TUNER TV-MONO SDA MST1 STB-6B/235S TV SIF SCL MST1 PC_L PC_R YPBPR1_L SPK L- YPBPR1 MAIN L SPEAKER L SPK L+ YPBPR1_R MAIN R SPK R- TPA3101 YPBPR2_L SPEAKER R SPK R+ STV8317F YPBPR2 YPBPR2_R AV1_L AV1_R AV L OUT AV R OUT...
  • Page 18 POWER BLOCK DIAGRAM POWER PCB +24 (LCD BACKLIGHT) U 2 3 + 3 . 3 V +5VSB C P U AP1117E33 6 1 P 7 - R G 4 4 0 W T R M C + 1 2 V F P R T PA 3 1 0 1 +8.0V + 8 .
  • Page 19: Schematic Diagrams

    SCHEMATIC DIAGRAMS QX68 CIRCUIT DIAGRAM-1...
  • Page 20 QX68 CIRCUIT DIAGRAM-2...
  • Page 21 QX68 CIRCUIT DIAGRAM-3...
  • Page 22 QX68 CIRCUIT DIAGRAM-4...
  • Page 23 SCHEMATIC DIAGRAMS QX68 CIRCUIT DIAGRAM-5...
  • Page 24 DDR2 CIRCUIT DIAGRAM-1...
  • Page 25 DDR2 CIRCUIT DIAGRAM-2...
  • Page 26 FLASH CIRCUIT DIAGRAM...
  • Page 27 PERIPHERAL CIRCUIT DIAGRAM...
  • Page 28 LVDS OUT CIRCUIT DIAGRAM...
  • Page 29 ANALOG INPUT CIRCUIT DIAGRAM...
  • Page 30 HDMI INPUT CIRCUIT DIAGRAM...
  • Page 31 HDMI SWITCH CIRCUIT DIAGRAM HDMI1_RX2+ HDMI1_RX2- HDMI1_RX1+ HDMI1_RX1- HDMI1_RX0+ HDMI1_RX0- HDMI1_RXC+ HDMI1_RXC- RX5V1_DDC_SCL RX5V1_DDC_SDA...
  • Page 32 AMP CIRCUIT DIAGRAM...
  • Page 33 AUDIO PROCESSOR CIRCUIT DIAGRAM AGND...
  • Page 34 TUNER CIRCUIT DIAGRAM...
  • Page 35 MCU CIRCUIT DIAGRAM...
  • Page 36 POWER CIRCUIT DIAGRAM...
  • Page 37 USB-MCU CIRCUIT DIAGRAM R908 4.7K R908 4.7K R909 4.7K R909 4.7K R914 4.7K R914 4.7K R915 4.7K R915 4.7K R916 4.7K R916 4.7K R917 4.7K R917 4.7K...
  • Page 38 AV BOARD ANALOG INPUT CIRCUIT DIAGRAM...
  • Page 39 CCT POWER CIRCUIT DIAGRAM...
  • Page 40: Troubleshooting

    TROUBLESHOOTING SYMPTOM: NO WORK/LED IS OFF No work / LED is off Check if power Replace power connection connection is normal Check if voltage of Replace Power PCB Power PCB pin 5 & 9 & 11 of CN1 is normal Check if voltage of pin1 Replace Main PCB of CNE1 is normal...
  • Page 41 SYMPTOM: NO WORK/LED IS RED CIRCUIT ABNORMAL No work / LED is red Check if voltage of pin1 Replace RMC PCB of RMC PCB is normal Check if voltage of pin 5 & Replace POWER PCB 9 & 11 of CN1 is normal Check if connection between Replace connection LCD and MAIN PCB is normal...
  • Page 42 SYMPTOM: NO PICTURE/LED IS BLUE ABNORMAL No Picture / LED is blue Check if Check if voltage of power Replace LCD panel backlight PCB CN3 pin 12 is normal is normal Check if connector of CN11,CN12, Replace CN11 CN13 is normal Check if signal of Replace Main PCB LVDS is normal...
  • Page 43 SYMPTOM: NO SVIDEO PICTURE ABNORMAL No SVIDEO Picture Check if signal of AV Replace AV PCB PCB RP2 pin8,9 is normal Replace Main PCB SYMPTOM: NO YPBPR PICTURE ABNORMAL No YPBPR1/2 Picture Check if signal of MAIN Replace Connection PCB CN14 pin1,3,5 or 2,4,6 is normal Replace Main PCB SYMPTOM: NO AV1 PICTURE ABNORMAL...
  • Page 44 SYMPTOM: NO AV2 PICTURE/NO AUDIO ABNORMAL No AV2 Picture/No audio Check if signal of AV Replace AV PCB PCB RP3 pin 6 is normal Replace Main PCB SYMPTOM: NO HDMI PICTURE ABNORMAL No HDMI Picture Check if HDMI signal Replace HDMI wire of CN21is normal Replace Main PCB SYMPTOM: NO VGA PICTURE/NO VGA AUDIO ABNORMAL...
  • Page 45 SYMPTOM: FUNCTION POOR ABNORMAL Function poor Check if function control signal of Replace FUNCTION BUTTON PCB RMC PCB IJ912 is normal Check if function control signal of Replace RMC PCB MAIN PCB CNE1 is normal Replace Main PCB SYMPTOM: NO RMC FUNCTION ABNORMAL No RMC function Check if RMC signal Replace RMC PCB...
  • Page 46 PWB ASSY YZE23267 L42X02A MAIN ASS'Y YZE23330 L42X02A RMC ASS'Y YZE23331 L42X02A SWITCH ASS'Y YZE23379 L42X02A AV ASS'Y YZES7907 MLT299TL POWER ASS'Y YZES7911 L42X02A FUNCTION BUTTON ASS'Y YZES7912 L42X02A LED ASS'Y MISCELLANEOUS YZEA60212 LC420WUD-SAC1 LCD TFT YZES06350 CLE-996G REMOTE CONTROL...
  • Page 47: Replacement Part List

    L42X02A HEADPHONE WIRE YZES31827 L42X02A AV CONNECT WIRE YZES31829 L42X02A HV CONNECT WIRE YZES31831 L42X02A POWER CONNECT WIRE YZES31832 L42X02A AC POWER CONNECT WIRE YZES31840 L42X02ALVDS WIRE A YZES31841 L42X02ALVDS WIRE B YZES31842 HDMI Female -2*10P-HSG –L42 WIRE YZES31853 AC POWER CORD (UL)
  • Page 48 L42X02A FUNCTION BUTTON ASS'Y YZEP20015 GRM39F104Z25PT YZEA6434 EVQ11L04W YZEP20015 GRM39F104Z25PT YZEA6434 EVQ11L04W YZEP20015 GRM39F104Z25PT KD48 YZEP11716 ICVL1018100Y500FR YZEP20015 GRM39F104Z25PT KJ910 YZEA9774 L42X02A Function Button Wire YZEP20085 GRM40Y5V225Z16 KR289 YZEP11054 RC-03K752JT CON1 YZEA6515 B-10B-PH SOCKET KR322 YZEP11026 RC-03K122JT CON2 YZEA60180 9GD20-T4-03 SOCKET...
  • Page 49 PART NAME YZEA7295 S-Video-757 SOCKET YZEP20015 GRM39F104Z25PT YZEA6984 AV-8.4-03 SOCKET YZEP20038 GRM39CH471J50PT YZEA7667 CK35-14 SOCKET YZEP20065 GRM40Y5V105Z16PT YZEP91051 PS121 YZEP20065 GRM40Y5V105Z16PT L42X02A MAIN ASS'Y YZEP20065 GRM40Y5V105Z16PT YZEP20006 GRM39CH101J50PT YZEP20065 GRM40Y5V105Z16PT YZEP20015 GRM39F104Z25PT YZEP20015 GRM39F104Z25PT YZEP20101 ECJ2FF1C106Z YZEP20012 GRM39B103K50PT YZEP20101 ECJ2FF1C106Z...
  • Page 50 The components shown in the remaining pages served as a reference only. It is not meant for ordering of components for servicing purposes. Do not quote any components from these lists. REF No. PART No. PART NAME REF No. PART No. PART NAME YZEP20015 GRM39F104Z25PT C136...
  • Page 51 The components shown in the remaining pages served as a reference only. It is not meant for ordering of components for servicing purposes. Do not quote any components from these lists. REF No. PART No. PART NAME REF No. PART No. PART NAME C204 YZEP20015 GRM39F104Z25PT...
  • Page 52 The components shown in the remaining pages served as a reference only. It is not meant for ordering of components for servicing purposes. Do not quote any components from these lists. REF No. PART No. PART NAME REF No. PART No. PART NAME C425 YZEP20015 GRM39F104Z25PT...
  • Page 53 C844 YZEP20028 GRM39CH221J50PT CN12 YZEA60218 PHD-16A-3.1-S C846 YZEP20038 GRM39CH471J50PT CN13 YZEA60217 PHD-32A-3.1-S C847 YZEP20015 GRM39F104Z25PT CN14 YZEA60220 L42X02A AV JACK A C848 YZEP20015 GRM39F104Z25PT CN16 YZEA60221 L42X02A AV JACK B C849 YZEP20038 GRM39CH471J50PT CNE1 YZEA6511 B-6B-PH C851 YZEP20015 GRM39F104Z25PT CON1...
  • Page 54 The components shown in the remaining pages served as a reference only. It is not meant for ordering of components for servicing purposes. Do not quote any components from these lists. REF No. PART No. PART NAME REF No. PART No. PART NAME CON4 YZEA6530 B-3B-XH...
  • Page 55 The components shown in the remaining pages served as a reference only. It is not meant for ordering of components for servicing purposes. Do not quote any components from these lists. REF No. PART No. PART NAME REF No. PART No. PART NAME L113 YZEP6700a MGFI2012D100KT-LF...
  • Page 56 The components shown in the remaining pages served as a reference only. It is not meant for ordering of components for servicing purposes. Do not quote any components from these lists. REF No. PART No. PART NAME REF No. PART No. PART NAME YZEP11784 RC-03K9762FT R144...
  • Page 57 The components shown in the remaining pages served as a reference only. It is not meant for ordering of components for servicing purposes. Do not quote any components from these lists. REF No. PART No. PART NAME REF No. PART No. PART NAME R269 YZEP11006 RC-03K101JT...
  • Page 58 The components shown in the remaining pages served as a reference only. It is not meant for ordering of components for servicing purposes. Do not quote any components from these lists. REF No. PART No. PART NAME REF No. PART No. PART NAME R526 YZEP11343 RC-03K102FT...
  • Page 59 The components shown in the remaining pages served as a reference only. It is not meant for ordering of components for servicing purposes. Do not quote any components from these lists. REF No. PART No. PART NAME REF No. PART No. PART NAME R956 YZEP11050 RC-03K561JT...
  • Page 60 The components shown in the remaining pages served as a reference only. It is not meant for ordering of components for servicing purposes. Do not quote any components from these lists. REF No. PART No. PART NAME REF No. PART No. PART NAME RV73 YZEP11716 ICVL1018100Y500FR...
  • Page 61 BOM OF THE AC POWER UNIT CCT NO. DESCRIPTIONS ITEMS t i c ± t i c ± ℃/470uF/16V t i c t i c ± t i c ± t i c ± t i c ± t i c ±...
  • Page 62 CCT NO. DESCRIPTIONS ITEMS L4,JP30,JP29,L5 Jumper 0Ω PC1B,PC2B,PC3B,PC4B Photocoupler PC817 (Sharp) PC1B,PC2B,PC3B,PC4B Photocoupler K10101X (COSMO) t s i t s i t s i t s i Q19,Q2,Q3,Q7,Q1,Q10, Transister LMBT4403LT1G Q13,Q9,Q12 t s i t s i t s i t s i Ω±5% R09,RP3,R34,RP8,RP9...
  • Page 63 CCT NO. DESCRIPTIONS ITEMS t s i Ω±5% R82,R04,R54,R14,R42 Resistor 1/8W/20Ω±5% t s i Ω±5% R86,R7,R66,RA39,RA57, Resistor 1/8W/0Ω±5% RA69,RA54,RA62,R89,RA88 t s i Ω±5% t s i Ω±5% t s i Ω±5% t s i Ω±5% t s i Ω±5% RA25,R96,RA22 Resistor 1/8W/6.2KΩ±1% t s i...
  • Page 64 L42X02A SC No. 0029E Copyright Digital Media Systems Group, (2008) All rights reserved...