HITACHI 32LD8D20E, 32LD8D20EA, 32LD8D20U, 32LD8D20UA, 37LD8D20E Service Manual
...
No. 0243
32LD8D20E
32LD8D20EA
32LD8D20U
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.
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.
32LD8D20UA
32LD8D20UC
37LD8D20E
37LD8D20U
37LD8D20UA
37LD8D20UC
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.
Contents
1. Introduction
2. Tuner
3. Audio Amplifier Stage
4. Power Stage
5. Microcontroller (VCTP)
6. DRX 3961A
7. Serial 64K I2C EEPROM
8. Class AB Stereo Headphone
Driver
9. SAW Filter X6966M
10. IC Descriptions
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
11.Service Menu Settings
12. Block Diagrams
13. Troubleshooting Guide
14. Connectors
15. Concept ICs
16. Replacement Parts
17. Assembly Drawing
18. Schematic Diagrams
19. PCB Layout Diagrams
Colour Television
December 2007
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’ and L/L’ including German and NICAM stereo.
Sound system output is supplying 2x 8W (10%THD) for stereo 8Ω speakers
Supported peripherals are:
1 RF input VHF1, VHF3, UHF @ 75Ohm
1 FAV input
2SCART sockets
1 SVHS input
1 Stereo Headphone input
1YPbPr
1 PC input
1HDMI input
1 Stereo audio input for PC
2. TUNER
As the thickness of the TV set has a limit, a horizontal mounted tuner is used in the
product, which is suitable for CCIR systems B/G, H, L/ L’, I/I’ and D/ K. The tuning is
available through the digitally controlled I2C bus (PLL). Below you will find info on the
Tuner in use.
2.1 General description of UV1316
The UV1316 tuner belongs to the UV 1300 family of tuners, which are designed to meet
a wide range of applications. It is a combined VHF, UHF tuner suitable for CCIR
systems B/G, H, L, L’, I and I’. The low IF output impedance has been designed for
direct drive of a wide variety of SAW filters with sufficient suppression of triple transient.
2.2 Brief description
The DTT 713XX is designed for digital terrestrial reception in VHFIII and UHF, compliant
with the European digital terrestrial standard ETS 300744. In addition it covers all channels
from 44.25MHz to 863.25MHz. It is a two band concept, VHF and UHF, with VHF switched
between VHF low (VHFI) and VHF high (VHFIII). Optional an antenna loop through function,
a combiner to feed through an RF-modulator signal to the TV output, a buffered 4MHz
crystal oscillator output, a DC/DC converter to generate 32V tuning voltage can be provided.
Instead of RF modulator input, an antenna power supply input is possible.
The DTT 713XX has the possibility to activate an internal wide band RF AGC.
Tuning, band switching and internal RF AGC is controlled via I2C bus. The metal housing
is in world standard tuner size. The module complies with the requirements of radiation,
signal handling capability and immunity interference of CENELEC standards EN 55013
and EN 55020.
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.
3.2 Features
x 2 x 20W Output at VDD = 24V into a 4 load
x THD+N = 0.06% at 1W, 8
x 93% Efficiency at 20W
x Low Noise (190μV Typical)
x Switching Frequency Up to 1MHz
x 9.5V to 24V Operation from a Single Supply
x Integrated Startup and Shutdown Pop Elimination Circuit
x Thermal and Short Circuit Protection
x Integrated 180m Switches
x Mute/Standby Modes (Sleep)
x Thermally Enhanced 20-Pin TSSOP Package with Exposed Pad
3.3 Applications
x Surround Sound DVD Systems
x Televisions
x Flat Panel Monitors
x Multimedia Computers
x 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. Power stage which is on-chasis generates +24V
for audio amplifier, 1.8V and 3.3V stand by voltage and 8V, 12V, 5V and 3.3Vsupplies
for other different parts of the chassis.
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
interface for flat-panel displays. The integrated microcontroller is supported by a
powerful OSD and graphics generator with integrated teletext acquisition.
Controller:
x High-performance 8-bit microcontroller, 8051 compatible
x Up to 512 kByte in system program Flash
x WST, PDC, VPS, and WSS acquisition
x Closed caption and V-chip acquisition
x Up to 10 page on chip teletext memory
x Up to 1000 pages with internal memory
x Up to 30 GPIO
Audio:
x Multistandard TV-sound demodulation:
-All A2/NICAM standards
-BTSC/SAP with DBX
-EIA-J
x Baseband sound processing for loudspeaker channel:
-Volume, bass, treble, loudness, balance
-Spatial effect (e.g. pseudo stereo)
-Micronas AROUND
(Virtual Dolby Surround optional)
-Micronas BASS
-BBE
-SRS WOW
-SRS TruSurround XT
-Lipsync function
Video:
x CVBS, S-VHS, YCrCb and RGB inputs
x HDTV YPrPb and RGB inputs
x ITU656 input
x Linedoubling with vertical detail enhancement (without internal memory)
x State of the art motion adaptive up conversion (with internal memory)
x 4H adaptive comb filter for PAL/NTSC (without internal memory)
x 3D comb filter for PAL/NTSC (with internal memory) (Optional)
x Internal SDR RAM interface
x Powerful horizontal and vertical scaling inclusive
x Nonlinear horizontal scaling “panorama vision”
x picture adaptive image improvements (DCE, LSE, CTI, SCE, NCE)
x non-linear colorspace enhancement (NCE) with 32 programmable slopes and
sections per RGB component (blue stretch, static black stretch, gamma
correction).
x Dynamic contrast enhancement (DCE) (histogram based black stretch with peak
black and activity detection and contrast adaption)
x Luma sharpness enhancement (LSE)
x Colour transient improvement (CTI)
x Selective colour enhancement (SCE) for skin tone correction, blue and green
stretch
5.2 Multistandard Sound Processor (MSP) Features
The MSP receives the analog Sound IF signal from the tuner and converts it to digital
with its internal SIF-AD converter. The MSP is able to demodulate all TV sound
standards worldwide including the digital NICAM system. TV stereo sound standards
that are unavailable for a specific VCTP version are processed in analog mono sound of
the standard. In that case, stereo or bilingual processing will not be possible.
x Sound IF input
x Worldwide FM/AM-mono sound demodulation
x FM stereo sound demodulation (A2, EIA-J)
x BTSC/SAP demodulation with DBX
x NICAM demodulation
x FM radio & RDS/RBDS demodulation
x Automatic standard detection
x automatic volume correction (AVC)
x Automatic sound select
x Baseband processing for loudspeaker channel:
volume, bass, treble, loudness, balance
-spatial effect (e.g. pseudo stereo)
-Micronas AROUND
-Micronas BASS
-SRS WOW (optional)
-SRS TruSurround XT (optional)
-delayline for lipsync function (shared memory)
-Virtual Dolby Surround (optional)
x 1 I2S input for external ATSC/DVD decoder
x 1 I2S interface for audio delayline
x 1 SPDIF output
x Audio i/o switches
-4 analog stereo line inputs and 2 analog stereo line outputs (configurable 5
analog stereo line inputs and 1 analog stereo line output)
-1 analog stereo loudspeaker output
-1 analog subwoofer output
-1 analog stereo headphone output
5.3 Video Features
The TVT is a Teletext decoder for decoding World System Teletext data, as well as
Video Programming System (VPS), Program Delivery Control (PDC), and Wide-Screen
Signalling (WSS) data used for PALplus transmissions (line 23). The device also
supports Closed Caption acquisition and decoding.
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.
The controller with dedicated hardware does most of the internal TTX acquisition
processing, transfers data to/from external memory interface, and receives/transmits
data via I2C-bus interface. In combination with dedicated hardware, the slicer stores
TTX data in a VBI buffer of 1 KB. The microcontroller firmware performs all the
acquisition tasks (hamming and parity checks, page search, and evaluation of header
control bits) once per field. Additionally, the firmware can provide high-end Teletext
features like Packet-26 handling, FLOF/TOP and list-pages. The interface-to-user
software is optimised for minimal overhead. TVT is realised in deep submicron
technology with 1.8 V supply voltage and 3.3 V I/O (TTL compatible).
x 16 analog video inputs (4xCVBS/Y/C + 3xRGB/YCrCb/YPrPb)
x Video input switch matrix
x 3 analog video outputs (integrated Y+C adder)
x 24-bit RGB/H/V/clk input (e.g. ext. DVI decoder) or 656 8bit input
x 656 8bit input/output (e. g. for external high-end up conversion by FRCA)
x Multi-standard color decoder PAL/NTSC/SECAM including all substandards
x 2D adaptive comb filter for PAL/NTSC with vertical peaking
x 3D-comb filter for PAL/NTSC (Optional)
x Macrovision compliant multi-standard sync processing
x Trilevel sync slicer for HDTV
x Macrovision detection
x High-quality soft mixer controlled by Fast Blank (alpha blending)
x Fastblank monitor via I2C
x Noise measurement
x Letterbox detection (auto-wide)
x Split screen (OSD and video side by side) and AV PIP
5.4 Controller Features
The TVT is a Teletext decoder for decoding World System Teletext data, as well as
Video Programming System (VPS), Program Delivery Control (PDC), and Wide-Screen
Signalling (WSS) data used for PALplus transmissions (line 23). The device also
supports Closed Caption acquisition and decoding.
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.
x High performance 8-bit microcontroller, 8051 instruction set compatible
x 81 MHz system clock, two machine cycles per instruction
x On-chip debug support (OCDS)
x Up to 512 kByte in system program Flash
x 256 byte on-chip program RAM
x 128 byte on-chip extended stack RAM
x 4-level, 24-input interrupt controller
x Patch module for 16 ROM locations
x Two 16-bit reloadable timers
x Capture compare timer for infrared decoding
x Watchdog timer
x Uart
x Real time clock
x PWM units (2 channels 14-bit, 6 channels 8-bit)
x 8-bit ADC (4 channels)
x I2C bus master/slave interface
x 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
customer-defined onscreen displays.
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.
In combination with dedicated hardware, the slicer stores TTX data in a VBI buffer of 1
KB. The microcontroller firmware performs all the acquisition tasks (hamming and parity
checks, page search, and evaluation of header control bits) once per field. Additionally,
the firmware can provide high-end Teletext features like Packet-26 handling, FLOF/TOP
and list-pages. The interface-to-user software is optimised for minimal overhead.
5.6 Port Allocation
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.
The alignment-free DRX 396xA does not need special external components. All control
functions and status registers are accessible via I2C bus interface.
6.2 Features
x Multistandard QSS IF processing with a single SAW
x Highly reduced amount of external components (no tank circuit, no
potentiometers, no SAW switching)
x Programmable IF frequency (38.9 MHz, 45.75 MHz, 32.9 MHz, 58.75 MHz,
36.125 MHz etc.)
x Digital IF processing for the following standards: B/G, D/K, I, L/L’, and M/N
x Standard specific digital post filtering
x Standard specific digital video/audio splitting
x Standard specific digital picture carrier recovery:
-Alignment-free
-Quartz-stable and accurate
-Stable frequency lock at 100% modulation and overmodulation up to
150%
-Quartz-accurate AFC information
x Programmable standard specific digital group delay equalization
x Automatically frequency-adjusted Nyquist slope, therefore optimum picture and
sound performance over complete lock in frequency range
x Standard-specific digital AGC and delayed tuner AGC with programmable tuner
take-over point
x Fast AGC due to linear structure
x Adaptive back porch control, therefore fast positive modulation AGC
x No sound traps needed at video output
x SIF output with standard-dependent pre-filtering and amplitude-controlled output
level
x Optimal sound SNR due to carrier recovery without quadrature distortions
x FM radio capability without external components and with standard TV tuner
x Prepared for digital TV (DVB-C, DVB-T, ATSC)
x I2C bus interface
7. SERIAL 64K I2C EEPROM M24C64WBN6
7.1 General Description
M24C64WBN6 is a 64 Kbit Electrically Erasable PROM. These I2C-compatible
electrically erasable programmable memory (EEPROM) devices are organized as
8192x8 bits. It supports 400kHz Protocol I2C uses a two-wire serial interface,
comprising a bi-directional data line and a clock line.
The M24C64WBN6 is available in the standard 8-pin (Vcc, WC, SDA (I2C data), SCL
(I2C clock), Vss,E0,E1,E2). WC pin is critcal pin. If WP is high, writing is not possible to
EEPROM. If WP is low, writing is possible to EEPROM.
7.2 Features
x Two-Wire I2C Serial Interface Supports 400kHz Protocol
x Single Supply Voltage:
– 4.5 to 5.5V for M24Cxx
– 2.5 to 5.5V for M24Cxx-W
– 1.8 to 5.5V for M24Cxx-R
x Write Control Input
x BYTE and PAGE WRITE (up to 32 Bytes)
x RANDOM and SEQUENTIAL READ Modes
x Self-Timed Programming Cycle
x Automatic Address Incrementing
x Enhanced ESD/Latch-Up Protection
x More than 1 Million Erase/Write Cycles
x 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. The device is fabricated in a 1 mm CMOS process and has
been primarily developed for portable digital audio applications. It gets its input from two
analog audio outputs (DACA_L and DACA_R) of MSP 34x0G. The gain of the output is
adjustable by the feedback resistor between the inputs and outputs.
8.2 Features
x Wide temperature range
x No switch ON/OFF clicks
x Excellent power supply ripple rejection
x Low power consumption
x Short-circuit resistant
x High performance
x High signal-to-noise ratio
x High slew rate
x Low distortion
x Large output voltage swing.
x Power supply maximum 60 mW to 32 (THD<0.1%)
x 5V single supply
x SNR 110 dB
x Power supply ripple rejection
x 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
9.2 Pin configuration:
1 Input
2 Input - ground
3 Chip carrier - ground
4 Output
5 Output
9.3 Frequency response:
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. The LM1117 is available in an adjustable version, which can set the
output voltage from 1.25V to 13.8V with only two external resistors. In addition, it is also
available in five fixed voltages, 1.8V, 2.5V, 2.85V, 3.3V, and 5V. The LM1117 offers
current limiting and thermal shutdown. Its circuit includes a zener trimmed bandgap
reference to as-sure output voltage accuracy to within ±1%. The LM1117 series is
available in SOT- 223, TO-220, and TO-252 D-PAK packages. A minimum of 10μF
tantalum capacitor is required at the output to improve the transient response and
stability.
10.1.2. Features
x Available in 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable Versions
x Space Saving SOT-223 Package
x Current Limiting and Thermal Protection
x Output Current 800mA
x Line Regulation 0.2% (Max)
x Load Regulation 0.4% (Max)
x Temperature Range
x LM1117 0°C to 125°C
x LM1117I -40°C to 125°C
10.1.3. Applications
x 2.85V Model for SCSI-2 Active Termination
x Post Regulator for Switching DC/DC Converter
x High Efficiency Linear Regulators 15
x 32” TFT TV Service Manual
x Battery Charger
x Battery Powered Instrumentation
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. It's low dropout voltage and fast
transient response make it ideal for low voltage microprocessor applications. Internal
current and thermal limiting provides protection against any overload condition
that would create excessive junction temperature.
10.2.2. Features
x Low Dropout Voltage 500mV at 1.5A Output Current
x Fast Transient Response
x 0.015% Line Regulation
x 0.1% Load Regulation
x Current Limiting and Thermal Protecion.
x Adjustable or Fixed Output Voltage(1.8, 2.5, 2.85, 3.0, 3.3, 3.45, 5.0V)
x Surface Mount Package SOT-223 & TO-263 (D2 Package)
x 100% Thermal Limit Burn-in
10.2.3. Applications
x Battery Charger
Adjustable Power Supplies
x
Constant Current Regulators
x
Portable Instrumentation
x
High Efficiency Linear Power Supplies
x
x High Efficiency "Green" Computer Systems
SMPS Post-Regulator
x
Power PC Supplies
x
x 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. Current mode operation provides fast transient response and eases loop
stabilisation. Fault condition protection includes cycle-by-cycle current limiting and
thermal shutdown. Adjustable soft-start reduces the stress on the input source at turnon. In shutdown mode the regulator draws 20μA of supply current. The MP1593
requires a minimum number of readily available external components to complete a 3A
step down DC to DC converter solution.
Loading...