Hitachi L26A01 Bedienungsanleitung

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

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