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Hitachi 32LD8A20 Service Manual
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Hitachi 32LD8A20 Service Manual

Hitachi 32LD8A20 Service Manual

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CAUTION:
Before servicing this chassis, it is important that the service technician read the "Safety
Precautions" and "Product Safety Notices" in this service manual.
ATTENTION:
Avant d'effectuer l'entretien du châssis, le technicien doit lire les «Précautions de sécurité»
et les «Notices de sécurité du produit» présentés dans le présent manuel.
VORSICHT:
Vor Öffnen des Gehäuses hat der Service-Ingenieur die „Sicherheitshinweise" und „Hinweise
zur Produktsicherheit" in diesem Wartungshandbuch zu lesen.
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
SERVICE MANUAL
MANUEL D'ENTRETIEN
WARTUNGSHANDBUCH
Contents
Colour Television
December 2007
No. 0242
32LD8A20
32LD8A20A
37LD8A20
37LD8A20A
Data contained within this Service
manual is subject to alteration for
improvement.
Les données fournies dans le présent
manuel d'entretien peuvent faire l'objet
de modifications en vue de perfectionner
le produit.
Die in diesem Wartungshandbuch
enthaltenen Spezifikationen können sich
zwecks Verbesserungen ändern.
12. Block Diagrams
13. Troubleshooting Guide

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  • Page 1: Table Of Contents

    No. 0242 32LD8A20 32LD8A20A 37LD8A20 37LD8A20A SERVICE MANUAL MANUEL D'ENTRETIEN WARTUNGSHANDBUCH CAUTION: Before servicing this chassis, it is important that the service technician read the “Safety Precautions” and “Product Safety Notices” in this service manual. Data contained within this Service manual is subject to alteration for improvement.

  • Page 2: Introduction

    1. INTRODUCTION 17MB22 Main Board consists of Micronas concept , VCTP as controller. This IC is capable of handling Audio processing, video processing, motion adaptive up conversion(MAU), Scaling-Display processing and FPD control (DPS), unified memory for audio video and Text, 3D comb filter, PC connectivity, OSD and text processing. TV supports PAL, SECAM, NTSC colour standards and multiple transmission standards as B/ G, D/K, I/I’...

  • Page 3: Audio Amplifier Stage

    3. AUDIO AMPLIFIER STAGE WITH MP7722 3.1 General Description The MP7722 is a stereo 20W Class D Audio amplifier, intended for use as low frequency power amplifier in a wide range of applications in radio and TV sets. It uses a minimum number of external components to complete a stereo Class D audio amplifier.

  • Page 4: Power Stage

    3.3 Applications Surround Sound DVD Systems Televisions Flat Panel Monitors Multimedia Computers Home Stereo Systems 3.4 Absolute Ratings 3.5 Pinning 4. POWER STAGE The DC voltages required at various parts of the chassis and inverters are provided by a main power supply unit and power interface board. The main power supply unit is designed for 24V and 12V DC supply.

  • Page 5: Microcontroller (Vctp)

    5. MICROCONTROLLER (VCTP) 5.1 General Features The VCT 6wxyP is dedicated to high-quality FPD and double-scan TV sets. The VCT 6wxyP family is based on functional blocks contained and approved in existing products like VCT 49xxI, VSP 94x5B, and DPS 94xxA. Each member of the family contains the entire audio, video, up-conversion processing for 4:3 and 16:9 50/ 60 Hz progressive or 100/120 Hz interlaced stereo TV sets and the control/data...
  • Page 6 non-linear colorspace enhancement (NCE) with 32 programmable slopes and sections per RGB component (blue stretch, static black stretch, gamma correction). Dynamic contrast enhancement (DCE) (histogram based black stretch with peak black and activity detection and contrast adaption) Luma sharpness enhancement (LSE) Colour transient improvement (CTI) Selective colour enhancement (SCE) for skin tone correction, blue and green stretch...
  • Page 7 The TVT provides an integrated general-purpose, fully 8051-compatible microcontroller with television-specific hardware features. The microcontroller has been enhanced to provide powerful features such as memory banking, data pointer, additional interrupts, shared memory access etc. The TVT has an internal XRAM of 32 KB and a BOOT ROM of 4 KB. For operation the code is fetched from a 16bit FLASH, which can be addressed up to 1 MByte.
  • Page 8 4-level, 24-input interrupt controller Patch module for 16 ROM locations Two 16-bit reloadable timers Capture compare timer for infrared decoding Watchdog timer Uart Real time clock PWM units (2 channels 14-bit, 6 channels 8-bit) 8-bit ADC (4 channels) I2C bus master/slave interface Up to 32 programmable I/O ports 5.5 OSD and Teletext Features The on-chip display unit for displaying Level 1.5 Teletext data can also be used for...

  • Page 17: Drx 3961A

    6. DRX 3961A 6.1 General Desription The DSP-based Analog TV IF Demodulator DRX 396xA performs the entire multistandard Quasi Split Sound (QSS) TV IF processing, AGC, video demodulation, and generation of the sound IF (SIF), requiring only one SAW filter. The IC is designed for applications in TV sets, VCRs, PC cards, and TV tuners.

  • Page 18: Serial 64K I2C Eeprom

    Programmable IF frequency (38.9 MHz, 45.75 MHz, 32.9 MHz, 58.75 MHz, 36.125 MHz etc.) Digital IF processing for the following standards: B/G, D/K, I, L/L’, and M/N Standard specific digital post filtering Standard specific digital video/audio splitting Standard specific digital picture carrier recovery: -Alignment-free -Quartz-stable and accurate -Stable frequency lock at 100% modulation and overmodulation up to...

  • Page 19: Class Ab Stereo Headphone Driver

    RANDOM and SEQUENTIAL READ Modes Self-Timed Programming Cycle Automatic Address Incrementing Enhanced ESD/Latch-Up Protection More than 1 Million Erase/Write Cycles More than 40-Year Data Retention 7.3 Absolute Maximum Ratings 7.4 Pinning 8. CLASS AB STEREO HEADPHONE DRIVER TDA1308 8.1. General Description The TDA1308 is an integrated class AB stereo headphone driver contained in an SO8 or a DIP8 plastic package.

  • Page 20: Saw Filter X6966M

    High slew rate Low distortion Large output voltage swing. Power supply maximum 60 mW to 32 (THD<0.1%) 5V single supply SNR 110 dB Power supply ripple rejection Typically 3 mA supply current at no load 8.3. Pinning 9. SAW FILTER X6966M 9.1 Features: - IF filter for digital cable TV - Plastic package SIP5K...
  • Page 21 9.2 Pin configuration: 1 Input 2 Input - ground 3 Chip carrier - ground 4 Output 5 Output 9.3 Frequency response:...

  • Page 22: Ic Descriptions

    10. IC DESCRIPTIONS AND INTERNAL BLOCK DIAGRAM LM1117 LM1086 MP1593 FDC642P SIL9011 24LC02 μPA672T M74HC4052 Max809 24LC21 10.1. LM1117 10.1.1. General Description The LM1117 is a series of low dropout voltage regulators with a dropout of 1.2V at 800mA of load current. It has the same pin-out as National Semiconductor’s industry standard LM317.
  • Page 23 10.1.4. Absolute Maximum Ratings 10.1.5. Pinning 10.2. LM1086 10.2.1. General Description The LM1086 is a low dropout three terminal regulator with 1.5A output current capability. The output voltage is adjustable with the use of a resistor divider. Dropout is guaranteed at a maximum of 500 mV at maximum output current.
  • Page 24 High Efficiency "Green" Computer Systems SMPS Post-Regulator Power PC Supplies Powering VGA & Sound Card 10.2.4. Absolute Maximum Ratings 10.2.5. Pinning 10.3. MP1593 10.3.1. General Description The MP1593 is a step-down regulator with an internal Power MOSFET. It achieves 3A continuous output current over a wide input supply range with excellent load and line regulation.
  • Page 25 10.3.2. Features 3A Output Current Programmable Soft-Start 100m Internal Power MOSFET Switch Stable with Low ESR Output Ceramic Capacitors Up to 95% Efficiency 20μA Shutdown Mode Fixed 385KHz Frequency Thermal Shutdown Cycle-by-Cycle Over Current Protection Wide 4.75 to 28V Operating Input Range Output Adjustable from 1.22V Under Voltage Lockout Available in 8-Pin SOIC Package...
  • Page 26 10.3.5. Electrical Characteristics 10.3.6. Pinning Pin1:BS High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET switch. Connect a 10nF or greater capacitor from SW to BS to power the high side switch. Pin2:IN Power Input. IN supplies the power to the IC, as well as the step-down converter switches.
  • Page 27 Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor from SS to GND to set the soft-start period. A 0.1μF capacitor sets the soft-start period to 10ms. To disable the soft-start feature, leave SS unconnected. 10.4. FDC642P 10.4.1. General Description This p-channel 2.5V specified MOSFET is produced using Fairchild’s advanced PowerTrench process that has been especially tailored to minimize on state resistance and yet maintain low gate charge for superior switching performance.
  • Page 28 10.5. SIL9011 The Sil 9011 is a third generation HDMI receiver compatible with the HDMI 1.1 specification. Backwards compatibility with DVI 1.0 allows HDMI systems to connect to existing DVI 1.0 hosts over a single cable. The Sil 9011 is capable of receiving and outputting 2 to 8 channels of digital audio of up to 192kHz.
  • Page 29 Organized as 1 block of 256 bytes (1 x 256 x 8) 2-wire serial interface bus, I C™ compatible Schmitt Trigger inputs for noise suppression Output slope control to eliminate ground bounce 100 kHz (24AA02) and 400 kHz (24LC02B) compatibility Self-timed write cycle (including auto-erase) Page write buffer for up to 8 bytes 2ms typical write cycle time for page write...
  • Page 30 10.7.2. Features Two MOS FET circuits in package the same size as SC-70 Automatic mounting supported 10.7.3 Absolute Maximum Ratings 10.7.4 Pinning 10.8. M74HC4052 10.8.1. General Description The M74HC4052 is a dual four-channel analog MULTIPLEXER/DEMULTIPLEXER fabricated with silicon gate C2MOS technology and it is pin to pin compatible with the equivalent metal gate CMOS4000B series.
  • Page 31 70W TYP. (VCC - VEE = 4.5V) 50W TYP. (VCC - VEE = 9V) WIDE ANALOG INPUT VOLTAGE RANGE: ±6V FAST SWITCHING: tpd = 15ns (TYP.) at TA = 25 °C LOW CROSSTALK BETWEEN SWITCHES HIGH ON/OFF OUTPUT VOLTAGE RATIO WIDE OPERATING SUPPLY VOLTAGE RANGE (VCC - VEE) = 2V TO 12V LOW SINE WAVE DISTORTION: 0.02% at VCC - VEE = 9V HIGH NOISE IMMUNITY: VNIH = VNIL = 28 % VCC (MIN.)
  • Page 32 10.9. Max809 10.9.1. General Description The MAX809 and MAX810 are cost effective system supervisor circuits designed to monitor VCC in digital systems and provide a reset signal to the host processor when necessary. No external components are required. The reset output is driven active within 10 _sec of VCC falling through the reset voltage threshold.
  • Page 33 10.9.4 Pinning...
  • Page 34 10.10. 24LC21 10.10.1. General Description The 24LC21 is a 1K bit electrically erasable programmable memory (EEPROM), organized by 8 bits.This device can operate in two modes: Transmit Only mode and I2C bidirectional mode. When powered, the device is in Transmit Only mode with EEPROM data clocked out from the rising edge of the signal applied on VCLK.

  • Page 35: Service Menu Settings

    10.10.4 Pinning 11.SERVICE MENU SETTINGS In order to reach service menu, First Press “MENU” Then press the remote control code, which is “4725” 11.1. Video Setup Picture Mute <..> If “Yes” selected, “Picture mute” feature is active. Blue Screen <..> If “Yes”...
  • Page 36 SRS WOW Virtual Dolby Surround <..> If “Yes” selected, Virtual Dolby Surround feature is seen in “Sound” menu with selected Virtual Dolby Text. Virtual Dolby Text The selected item is seen as Virtual Dolby Srround Text. Virtual Dolby 3D Panorama AVL <..>...
  • Page 37 Select Languages <..> “Yes” selected languages are seen as option under the “Language” item in “Feature” menu Language Set 1 o German <..> o French <..> o Spanish <..> o Italian <..> o Danish <..> o Finnish <..> o Swedish <..> Language Set 2 o Greek <..>...
  • Page 38 11.5. Service Scan/Tuning Setup Search for L/L’ <..> Pref. Search Standard <...> BG, DK, I L/L’ Station Ident <..> ATS Delay Time (ms) <..> Value between 20 to 250 Color Killer Threshold <..> Value between 0 to +255 Tuner Options <..> Control Byte <..>...
  • Page 39 x Colour Temp <..> Cool Normal Warm x Contrast <..> Value between 0 to +63 x Brightness <..> Value between 0 to +63 x Sharpness <..> Value between 0 to +15 x Colour <..> Value between 0 to +63 x Backlight <..> Value between 0 to +255 x R <..>...
  • Page 40 NO DEFECT APPEARANCE DEFECT IDENTIFICATION AND SOLUTIONS When the TV is operated for the first time, IC403 E2Epron is plugged empty, after the programming process of the first values has finished, TV will switch on by itself. STANDBY LED lights but the TV switches on Are there 3.3V on IC001's bottomright pin? If no, 3.3V are not drawing in, there can be an error in PW board;...
  • Page 43 13.3. DRX (IF Demodulator) Block Diagram...
  • Page 44 13.4. VCTP 14.4.1. General Block Diagram...
  • Page 45 13.4.2. MSP Block Diagram...

  • Page 47: Connectors

    14. CONNECTORS 14.1. POWER Connector Description +12/24V +12/24V 14.2. EMMA2LL JTAG Connector Description JTCLK 3.3V JTDO JTMS JTRST JTDI 14.3. ANALOG AV Connector Description Description 1 DVB_SCL 2 DVB_SDA 3 GND DVB_R_AUDIO 4 GND DVB_L_AUDIO 5 IRQ 6 DVB_RX DVB_IN_CVBS 7 DVB_TX 8 GPIO4 DVB_IN_B / DVB_IN_C...
  • Page 48 14.4. IF Connector Description IF + IF - 14.5. PROGRAMMING Connector Description 14.6. S/PDIF Connector Description S/PDIF 14.7. DIGITAL AV Connector Description Description 1 I2S Word Select 11 GND 2 I2S Serial Clock 12 Digital Video Pixel Clock 3 I2S Serial Data 13 Digital Video Y/Cb/Cr DATA7 4 GND 14 Digital Video Y/Cb/Cr DATA6...
  • Page 49 14.8. PCMCIA Connector Signal Description Signal Description 35 GND Ground Ground 36 CD1# Data bit 3 Card Detect 37 MDO3 Data bit 4 MPEG Data Out 3 38 MDO4 Data bit 5 MPEG Data Out 4 39 MDO5 Data bit 6 MPEG Data Out 5 40 MDO6 Data bit 7...

  • Page 50: Replacement Parts

    15. REPLACEMENT PARTS THE UPDATED PARTS LIST FOR THIS MODEL IS AVAILABLE ON ESTA...

  • Page 51: Assembly Drawing

    16. ASSEMBLY DRAWING [For 37 inch models ONLY] No. 0242 EXPLODED VIEW...
  • Page 52 [For 32 inch models ONLY] No. 0242 EXPLODED VIEW...

  • Page 53: Schematic Diagrams

    17. SCHEMATIC DIAGRAMS 330R_100MHZ_3A 3V3_DRX L103 VCC_5V L114 5V_DRX L117 L112 SHEET 8 VCC_12V 12V_IF VGA_MUX_SW PL100 DIGITAL IF CONNECTOR X100 L116 YPBPR_MUX_SW 3V3_DRX C134 L104 VCC_3V3 AUDIO_MUX_SW R139 S100 20.25MHz N.C. 5V_TUNER L102 5V_TUNER DRX_CLK PTC RES SYNC_SW1 C101 VCC_5V SHEET3 1UF 16V...
  • Page 54 R332 R333 VCC_8V VCC_8V C266 C229 SC3_AUDIO_R_OUT SC2_AUDIO_R_OUT TO SHT7 R290 BC858B C267 100R R206 Q208 BC858B SC1_AUDIO_R_OUT 100R Q201 BC858B Q207 C218 R232 VCTP_AOUT1R SHT3 L211 330R LINE_R_OUT Q205 SHT3 C268 BC848B VCTP_AOUT2R VCTP_AOUT1L SC3_AUDIO_L_OUT R273 R278 150R SC2_CVBS_OUT R291 BC858B VCTP_AOUT2L...
  • Page 55 L415 5V_COM VCC_5V KEYBOARD R543 R487 PC STANDBY MODE SYNC DETECTION PL403 R467 PL402 IDTV DIGITAL INTERFACE [FFC TYPE] IC405 VSUP_3V3_COM KEYBOARD CONN. KEYBOARD IDTV_HSYNC 1 Y0 5V_COM SHEET 2 2 Y2 HDMI_VSYNC R544 HDMI_HSYNC VSUP_3V3_COM KEYBOARD R432 PIP_CLK HSYNC 3 COM_Y_OUT_IN PC_VSYNC R554...
  • Page 56 SHEET2 S612 OPTIONAL L603 HP_OUT_L VIN_24V AMP_24V BC558B Q603 VCC_5V D611 L604 1N4148 22uH_3.9A_SMD IC600 D610 C614 C3V6 C636 1000UF 30000361 USED 8 VDD OUTA HP_OUT_R 100u SHEET3 TO REDUCE POWER C623 ON HP POPPING R613 IF AMP_MUTE HIGH ENOUGH TO ENABLE AMPLIFIER OPTIONAL RESISTOR WILL BE USED HEADPHONE_R 7 OUTB INA-...
  • Page 57 VCC_1V8 IC101 LM1117 3 IN VCC_3V3 HDMI_1V8 VOUT D104 R103 P1_CBL5V E1_VCC5V R102 D103 1N4148 P2_CBL5V E2_VCC5V HOTPLUG2_DET 1N4148 IC102 HOTPLUG_DET LM1117 S130 3 IN VCC_5V HDMI_3V3 VOUT HOTPLUG1_DET Q104 Q105 Q110 R143 2N7002 2N7002 BSN20 P2_CBL5V P1_CBL5V P2_CBL5V R117 R115 R1_PWR5V R2_PWR5V...
  • Page 58 PIP_DECODER_3V3 100n C847 C846 PIP TUNER/IF/ SHEET3 ,8 R824 Q802 PIP_CVBS_OUT 100R BC848B VPX DECODER SHEET3 C839 R832 L805 S802 VIN1 PIP_DATA7 NCS6416 OPT 470n AVSS PIP_DATA6 C849 C848 CIN2 PIP_DATA5 L808 100n PIP_DECODER_5V AVDD PIP_DATA4 C835 330R_100MHZ_3A PIP_DECODER_3V3 XTAL1 PVDD PIP_DECODER_3V3 VCC_5V...
  • Page 59 VCC_10V_AUDIO IC901 IC903 IC905 SHT1 DRX SHT1 DRX 600R_100MHZ_200mA 600R_100MHZ_200mA C936 VGA_MUX_SW VCC_5V_VIDEO YPBPR_MUX_SW VCC_5V_VIDEO 600R_100MHZ_200mA L904 L908 VCC_10V_AUDIO VCC_5V_VIDEO 100k VCC_5V_VIDEO 100k L909 SHT2 C900 R900 R918 PC_R YPBPR_PR SHT2 R932 220n R901 220n R919 PC_AUDIO_R_IN 100k 100k R929 SHT2 C920 C947...
  • Page 60 C075 USE IF PW15 OR PLASMA L084 100n L083 R070 R073 IC007 150k 160k LIPS OPT. N.C. N.C. PL081 C078 IC080 PANEL_5V C076 VCC_12V R075 VCC_12V PL080 FPGA SUPPLY COMP VCC_12V R072 R074 L085 VCC_12V R080 R083 MP1593-DC/DC PL001 IDTV SUPPLY VIN_24V L070 R081...
  • Page 61 [For ALL models except 32LD8A20] S808 Q828 S807 S812 TR805 L814 PL809 BU2508AF F800 TRF_SAFE_TFT_RES 3.15A Q829 S811 STPS_3P_ L817 S809 10L60CFP D800 GBU4M L815 C890 R847 5VREF S810 450V L802 PL801 2u7_RESONANT TR806 L816 210u SMPS-RESONANT_PFC Q815 R961 +400V...
  • Page 62 [For 32LD8A20 model ONLY] TR806 SMPS-RESONANT_PFC +400V R819 R818 TR805 330k 330k TRF_SAFE_TFT_RES Q829 Q828 BU2508AF MTP3N60E +400V R847 Q815 MTP6N60E/ PL801 C890 SSP7N60A IC807 5VREF L816 D800 BA159_SMD R897 450V SW_OFF GBU4M R961 L810 D831 +400V +24V C889 C888...

  • Page 63: Pcb Layout Diagrams

    18. PCB Layout Diagrams S914 C495 R420 R487 PL210 S911 L904 R403 PL200 R543 S462 C918 R224 S908 S903 S907 S902 D200 S461 R223 C601 S444 R600 C602 D201 R226 S402 IC600 R601 R216 R422 PL206 D204 C610 L213 L214 D202 S467 R606...
  • Page 64 C907 C906 C851 D853 Q841 C900 R978 C853 PL813 C848 R993 R992 R1002 R843 R1000 D805 R998 R960 L816 C852 T R 805 R971 C894 R971 C813 SOLDER SIDE (BOTTOM) COMPONENT SIDE (TOP) 17MB15-9 POWER BOARD FOR 32LD8A20 MODEL ONLY...
  • Page 65 [17PW15-9 POWER BOARD used in 32LD8A20 model ONLY] MAIN BOARD (17MB22-2) FAV BOARD (17FAV15) POWER BOARD (17PW15-9) [FOR 32LD8A20 MODEL ONLY] No. 0242 PHOTOGRAPHS OF CHASSIS AND BOARDS...
  • Page 66 Fax: +46 (0) 8 562 711 13 Tel: +39 02 38073415 Servizio Clienti Email: csgswe@hitachi-eu.com Fax: +39 02 48786381/2 Email: customerservice.italy@hitachi-eu.com HITACHI EUROPE S.A.S HITACHI EUROPE LTD (Norway) AB Lyon Office STRANDVEIEN 18 B.P. 45, 69671 BRON CEDEX 1366 Lysaker FRANCE...

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