Hitachi L26A01 User manual

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.
SERVICE MANUAL
MANUEL D'ENTRETIEN
WARTUNGSHANDBUCH
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.
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
Colour Television
December 2007
No. 0245
L26A01
L32A01
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
11.Service Menu Settings
12. Block Diagrams
13.Troubleshooting Guide
14.Connectors
15.ReplacementParts
16.AssemblyDrawings
17.SchematicDiagrams
18.PCBLayoutDiagrams
Contents
L32A01A
L32A01B

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 8Ωspeakers
Supported peripherals are:
1 RF input VHF1, VHF3, UHF @ 75Ohm
1 FAV input
3SCART sockets
1 SVHS input
1 Stereo Headphone input
1YPbPr
1 PC input
2HDMI 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
x2 x 20W Output at VDD = 24V into a 4load
xTHD+N = 0.06% at 1W, 8
x93% Efficiency at 20W
xLow Noise (190μV Typical)
xSwitching Frequency Up to 1MHz
x9.5V to 24V Operation from a Single Supply
xIntegrated Startup and Shutdown Pop Elimination Circuit
xThermal and Short Circuit Protection
xIntegrated 180mSwitches
xMute/Standby Modes (Sleep)
xThermally Enhanced 20-Pin TSSOP Package with Exposed Pad

3.3 Applications
xSurround Sound DVD Systems
xTelevisions
xFlat Panel Monitors
xMultimedia Computers
xHome 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:
xHigh-performance 8-bit microcontroller, 8051 compatible
xUp to 512 kByte in system program Flash
xWST, PDC, VPS, and WSS acquisition
xClosed caption and V-chip acquisition
xUp to 10 page on chip teletext memory
xUp to 1000 pages with internal memory
xUp to 30 GPIO
Audio:
xMultistandard TV-sound demodulation:
-All A2/NICAM standards
-BTSC/SAP with DBX
-EIA-J
xBaseband 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:
xCVBS, S-VHS, YCrCb and RGB inputs
xHDTV YPrPb and RGB inputs
xITU656 input
xLinedoubling with vertical detail enhancement (without internal memory)
xState of the art motion adaptive up conversion (with internal memory)
x4H adaptive comb filter for PAL/NTSC (without internal memory)
x3D comb filter for PAL/NTSC (with internal memory) (Optional)
xInternal SDR RAM interface
xPowerful horizontal and vertical scaling inclusive
xNonlinear horizontal scaling “panorama vision”
xpicture adaptive image improvements (DCE, LSE, CTI, SCE, NCE)

xnon-linear colorspace enhancement (NCE) with 32 programmable slopes and
sections per RGB component (blue stretch, static black stretch, gamma
correction).
xDynamic contrast enhancement (DCE) (histogram based black stretch with peak
black and activity detection and contrast adaption)
xLuma sharpness enhancement (LSE)
xColour transient improvement (CTI)
xSelective 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.
xSound IF input
xWorldwide FM/AM-mono sound demodulation
xFM stereo sound demodulation (A2, EIA-J)
xBTSC/SAP demodulation with DBX
xNICAM demodulation
xFM radio & RDS/RBDS demodulation
xAutomatic standard detection
xautomatic volume correction (AVC)
xAutomatic sound select
xBaseband 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)
x1 I2S input for external ATSC/DVD decoder
x1 I2S interface for audio delayline
x1 SPDIF output
xAudio 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).
x16 analog video inputs (4xCVBS/Y/C + 3xRGB/YCrCb/YPrPb)
xVideo input switch matrix
x3 analog video outputs (integrated Y+C adder)
x24-bit RGB/H/V/clk input (e.g. ext. DVI decoder) or 656 8bit input
x656 8bit input/output (e. g. for external high-end up conversion by FRCA)
xMulti-standard color decoder PAL/NTSC/SECAM including all substandards
x2D adaptive comb filter for PAL/NTSC with vertical peaking
x3D-comb filter for PAL/NTSC (Optional)
xMacrovision compliant multi-standard sync processing
xTrilevel sync slicer for HDTV
xMacrovision detection
xHigh-quality soft mixer controlled by Fast Blank (alpha blending)
xFastblank monitor via I2C
xNoise measurement
xLetterbox detection (auto-wide)
xSplit 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.
xHigh performance 8-bit microcontroller, 8051 instruction set compatible
x81 MHz system clock, two machine cycles per instruction
xOn-chip debug support (OCDS)
xUp to 512 kByte in system program Flash
x256 byte on-chip program RAM
x128 byte on-chip extended stack RAM

x4-level, 24-input interrupt controller
xPatch module for 16 ROM locations
xTwo 16-bit reloadable timers
xCapture compare timer for infrared decoding
xWatchdog timer
xUart
xReal time clock
xPWM units (2 channels 14-bit, 6 channels 8-bit)
x8-bit ADC (4 channels)
xI2C bus master/slave interface
xUp 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
xMultistandard QSS IF processing with a single SAW
xHighly reduced amount of external components (no tank circuit, no
potentiometers, no SAW switching)

xProgrammable IF frequency (38.9 MHz, 45.75 MHz, 32.9 MHz, 58.75 MHz,
36.125 MHz etc.)
xDigital IF processing for the following standards: B/G, D/K, I, L/L’, and M/N
xStandard specific digital post filtering
xStandard specific digital video/audio splitting
xStandard 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
xProgrammable standard specific digital group delay equalization
xAutomatically frequency-adjusted Nyquist slope, therefore optimum picture and
sound performance over complete lock in frequency range
xStandard-specific digital AGC and delayed tuner AGC with programmable tuner
take-over point
xFast AGC due to linear structure
xAdaptive back porch control, therefore fast positive modulation AGC
xNo sound traps needed at video output
xSIF output with standard-dependent pre-filtering and amplitude-controlled output
level
xOptimal sound SNR due to carrier recovery without quadrature distortions
xFM radio capability without external components and with standard TV tuner
xPrepared for digital TV (DVB-C, DVB-T, ATSC)
xI2C 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 (I2Cdata), SCL
(I2Cclock), 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
xTwo-Wire I2C Serial Interface Supports 400kHz Protocol
xSingle 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
xWrite Control Input
xBYTE and PAGE WRITE (up to 32 Bytes)

xRANDOM and SEQUENTIAL READ Modes
xSelf-Timed Programming Cycle
xAutomatic Address Incrementing
xEnhanced ESD/Latch-Up Protection
xMore than 1 Million Erase/Write Cycles
xMore 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
xWide temperature range
xNo switch ON/OFF clicks
xExcellent power supply ripple rejection
xLow power consumption
xShort-circuit resistant
xHigh performance
xHigh signal-to-noise ratio

xHigh slew rate
xLow distortion
xLarge output voltage swing.
xPower supply maximum 60 mW to 32(THD<0.1%)
x5V single supply
xSNR 110 dB
xPower supply ripple rejection
xTypically 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