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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 châassis, 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
COLOUR TELEVISION
APRIL 2002
No. 0108
C28W440N
CL28W440AN
C28WF540N
C32WF540N
Data
contained
within
this
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.
Service
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Table of Contents
Related Manuals for Hitachi C28W440N
Summary of Contents for Hitachi C28W440N
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Page 1: Service Manual
No. 0108 C28W440N CL28W440AN C28WF540N C32WF540N 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: Table Of Contents
1. INTRODUCTION ______________________________________________ 6 2. SMALL SIGNAL PART WITH TDA8885 ____________________________ 6 2.1. Vision IF amplifier __________________________________________________6 2.2. Video Switches _____________________________________________________7 2.3. Sound Circuit ______________________________________________________7 2.4. Synchronisation circuit ______________________________________________7 2.5. Chroma and Luminance processing ____________________________________8 2.6. Colour Decoder_____________________________________________________8 2.7. PICTURE IMPROVEMENT FEATURES ______________________________9 2.8. - Page 3 16.2. UV1315, UV1316_________________________________________________17 16.2.1. General description of UV1315: _________________________________________ 17 16.2.2. Features of UV1315: __________________________________________________ 17 16.2.3. General description of UV1316: _________________________________________ 18 16.2.4. Features of UV1316: __________________________________________________ 18 16.3. TEA6415C: _____________________________________________________18 16.3.1. General Description: __________________________________________________ 18 16.3.2. Features: ____________________________________________________________ 18 16.4.
- Page 4 16.18. SDA9488x_______________________________________________________34 16.18.1. Features __________________________________________________________ 34 16.19. TDA9885i_______________________________________________________35 17. CHASSIS MANUAL ADJUSTMENTS PROCEDURE __________ 18. CIRCUIT DESCRIPTION 19. ASSEMBLY DIAGRAM 20 . SCHEMATIC DIAGRAMS 21. PARTS LISTS...
- Page 5 DO NOT CHANGE ANY MODULE UNLESS THE SET IS SWITCHED OFF The mains supply part of the switch mode power supply’ s transformer is live. Use an isolating transformer. The receiver complies with the safety requirements. SAFETY PRECAUTIONS: The service of this TV set must be carried out by qualified persons only. Components marked with the warning symbol on the circuit diagram are critical for safety and must only be replaced with an identical component.
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Page 6: Introduction
INTRODUCTION This is a 110° chassis capable of driving 28-29”,32”,33” tubes at appropriate currents. The chassis have, Frequency Controlled Tuning (PLL), and control system for multi-standard (Pal,Secam,BG,DK,L/L’ ,I/I’ ,NTSC,M,N ) TV receivers with on-screen-display (OSD) for all relevant control functions. The system is based on the ‘ one-chip’ I C bus controlled video processing/deflection IC TDA8885 which also controls sound. -
Page 7: Video Switches
control circuit of the IF-PLL demodulator and can be read via the I²C bus. For fast search tuning systems the window of the AFC can be increased with a factor 3. The setting is realised with the AFW bit. The AGC-detector operates on top sync and top white-level. The demodulation polarity is switched via the I 2 C-bus. -
Page 8: Chroma And Luminance Processing
stop at very weak input signals. The first PLL has a very high statically steepness so that the phase of the picture is independent of the line frequency. The horizontal drive signal is generated by an internal VCO, which is running at a frequency of 25 MHz. This oscillator is stabilised to that frequency by using the 12 MHz frequency of the crystal oscillator as a reference. -
Page 9: Picture Improvement Features
frequency as a reference. Under bad-signal conditions (e.g. VCR-playback in feature mode), it may occur that the colour killer is activated although the colour PLL is still in lock. When this killing action is not wanted it is possible to overrule the colour killer by forcing the colour decoder to the required standard and to activate the FCO-bit (Forced Colour On) in subaddress 21H. -
Page 10: East - West Output Stage
During switch-off of the TV receiver, the black current control circuit generates a fixed beam current. This current ensures that the picture tube capacitance is discharged. During the switch-off period the vertical deflection can be placed in an overseen position so that the discharge is not visible on the screen. -
Page 11: Video Switch Tea6415C
(1). Enough margin is available to tune down to 45.25 MHz. (2). Enough margin is available to tune up to 863.25 MHz. Noise Gain Typical Max. Min. Typical Max. 52dB Low band : 5dB All channels : 38dB 44dB Gain Taper (of f- air channels) : Mid band : 5dB High band... -
Page 12: Vertical Output Stage With Stv 9379
VERTICAL OUTPUT STAGE WITH STV 9379 The IC TDA9379FA is the vertical deflection booster circuit. Two supply voltages, +14V and –14V are needed to scan the inputs VERT+ and VERT-, respectively. And a third supply voltage, +60V for the flyback limiting are needed. The vertical deflection coil is connected in series between the output and feedback to the input. -
Page 13: Memory
Memory 12.4. • Up to 128 Kilobyte on Chip Program ROM • Eight 16-bit data pointer registers (DPTR) • 256-bytes on-chip Processor Internal RAM (IRAM) • 128bytes extended stack memory. • Display RAM and TXT/VPS/PDC/WSS-Acquisition-Buffer directly accessible via MOVX • UP to 16KByte on Chip Extended RAM (XRAM) consisting of; - 1 Kilobyte on-chip ACQ-buffer-RAM (access via MOVX) - 1 Kilobyte on-chip extended-RAM (XRAM, access via MOVX) for user software - 3 Kilobyte Display Memory... -
Page 14: 13. Serial Access Cmos 8K (1024*8) Eeprom St24C08
13. SERIAL ACCESS CMOS 8K (1024*8) EEPROM ST24C08 The ST24C08 is a 8Kbit electrically erasable programmable memory (EEPROM), organised as 4 blocks of 256*8 bits. The memory is compatible with the I²C standard, two wire serial interface, which uses a bi-directional data bus and serial clock. -
Page 15: General Description
GENERAL DESCRIPTION 16.1.1. The TDA 8885 is I² C-bus controlled singlechip TV processor, which is intended to be applied in PAL/NTSC and multi-standard television receivers. IC contains integrated sound band-pass trap circuits, a switchable group delay correction circuit and a multi-standard colour decoder which needs only one (12 MHz) reference crystal for all standards. -
Page 16: Pin Description
Pin Description 16.1.3. IF input 1 IF input 2 overvoltage protection input vertical sawtooth capacitor reference current input ground tuner AGC output SIF input 1 SIF input 2 narrow-band PLL filter AGC sound IF QSS out internally connected half tone (contrast reduction) low-power start-up IF-PLL loop filter IF video output... -
Page 17: Uv1315, Uv1316
SYMBOL PARAMETER MIN. TYP. MAX. UNIT Supply supply voltage supply current Input voltages video IF amplifier sensitivity (RMS value) i(VIF)(rms) sound IF amplifier sensitivity (RMS value) i(SIF)(rms) external CVBS/Y input (peak-to-peak value) i(CVBS/Y)(p-p) external chroma input voltage i(CHROMA)(p-p) (burst amplitude)(peak-to-peak value) RGB inputs (peak-to-peak value) i(RGB)(p-p) luminance input signal (peak-to-peak value) -
Page 18: General Description Of Uv1316
General Description of UV1316: 16.2.3. 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. -
Page 19: Tda7265
• Cascadable with another TEA6415C (Internal address can be changed by pin 7 voltage) • 8 inputs (CVBS, RGB, Mac, CHROMA, … ) • 6 Outputs • Possibility of MAC or chroma signal for each input by switching off the clamp with an external resistor bridge •... -
Page 20: Features
Features 16.4.1 Wide supply voltage range (up to 50V ABS Max.) • Split supply • High output power: 25+25 W @ TDA = 10%, R = 8ohm, V = ±20V • No pop at turn-on / off • Mute (pop free) •... -
Page 21: Hct 32
74HCT32 ( For audio switching in multiple audio input models ) 16.6. The 74HC/HCT32 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC. The 74HC/HCT32 provide the 2-input OR function.Used for audio switching purposes. -
Page 22: General Features
MC44608 16.7. General Description: 16.7.1. The MC44608 is a high performance voltage mode controller designed for off–line converters. This high voltage circuit that integrates the start–up current source and the oscillator capacitor, requires few external components while offering a high flexibility and reliability. The device also features a very high efficiency stand–by management consisting of an effective Pulsed Mode operation. - Page 23 SDA5555: ( controller ) 16.8. General Description: 16.8.1. • Feature selection via special function register • Simultaneous reception of TTX, VPS, PDC, and WSS (line 23) • Supply Voltage 2.5 and 3.3 V PINNING Comb Filter Standard Selection 1 Low Level : 0V High Level : 3.3 V Key 2 Low Level : 0V...
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Page 24: Tda9181
24 IR-input Low Level : 0V High Level : 3.3 V 25 Data output Low Level : 0V High Level : 3.3 V 26 Clock signal output Low Level : 0V High Level : 3.3 V 27 Stand-By Mode selection Low Level : 0V High Level : 3.3 V 28 Not used... -
Page 25: General Features
Pin#: Pin-1 = Cý n=Chrominance input signal Pin-2 = INPSEL=input switch select input Pin-3 =Y/CVBS2=luminance or CVBS input signal 2 Pin-4 = Digital GND Pin-5= VDD=digital supply voltage Pin-6=VCC=analog supply voltage Pin-7 =SC=sandcastle input signal Pin-8 =FSCSEL=color subcarrier select input Pin-9 = FSC=color subcarrier input signal Pin-10 =SYS2=standart select 2 input Pin-11 = SYS1=standart select 1 input... -
Page 26: Applications
Applications 16.10.2. Circuits for safe protective separation against electrical shock according to safety class II (reinforced isolation): For appl. class I – IV at mains voltage ? 300 V For appl. class I – III at mains voltage ? 600 V according to VDE 0884, table 2, suitable for: Switch-mode power supplies, line receiver, computer peripheral interface, microprocessor system interfaces. -
Page 27: Tda1308
PINNING PIN VALUE 1. Write protect enable (Ground) : 0V 2. Not connected (Ground) : 0V 3. Chip enable input (Ground) : 0V 4. Ground : 0V 5. Serial data address input/output : Input LOW voltage : Min : -0.3V, Max : 0.3*Vcc Input HIGH voltage: Min : 0.7*Vcc, Max : Vcc+1 6. -
Page 28: General Description
• Clock function with four year calendar • Universal timer with alarm and overflow indication • 24 or 12 hour format • 32.768 kHz or 50 Hz time base • Serial input/output bus (I • Automatic word address incrementing • Programmable alarm, timer and interrupt function •... -
Page 29: Safety Features
-Improved Regulation Block Dynamic Behaviour -Synchronisation Capability -Internally Trimmed Reference Current Source Safety Features: 16.14.2. -Overvoltage Protection: Output Overvoltage Detection -Undervoltage Protection: Protection Against Open Loop -Effective Zero Current Detection -Accurate and Adjustable Maximum On–Time Limitation -Overcurrent Protection -ESD Protection on Each Pin LIMITS: 16.14.3. -
Page 30: Pinning
PINNING 16.15.2. Pin1 : Output Stage Supply Pin2 : Output Pin3 : GND or Negative Supply Pin4 : Flyback Supply Pin5 : Supply Voltage Pin6 : Inverting Input Pin7 : Non-inverting Input MSP34XX : 16.16. MSP3411D Multistandard Sound Processor Family with Virtual Dolby Surround 1. - Page 31 Source Select I2S bus interface consists of five pins: I2S_DA_IN1… 2 for input four channels (two channels per line) per sampling cycle (32Khz). I2DA_OUT, for output, two channels per sampling cycle (32KHz). I2S_CL, for timing of the transmission of I2S serial data, 1.024Mhz. I2S_WS, for the word strobe line defining the left and right sample.
- Page 32 Loudspeaker / Headphone channel with volume, balance, bass, treble, loudness AVC: Automatic Volume Correction Subwoofer output with programmable low-pass and complementary high-pass filter 5-band graphic equalizer for loudspeaker channel Spatial effect for loudspeaker channel; processing of all deemphasis filtering Four Stereo SCART (line) inputs, one Mono input; two Stereo SCART outputs Complete SCART in/out switching matrix Two I²S inputs;...
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Page 33: Lm358N
12. I²C Bus address select Volume capacitor AUX 13. Digital control output 0 Scart output 1, left 14. Digital control output 1 Scart output 1, right 15. Not connected Reference ground 1 high voltage part 16. Not connected Scart output 2, left 17. -
Page 34: Sda9488X
Wide bandwidth (unity gain): 1 MHz (temperature compensated) Wide power supply range: — Single supply: 3V to 32V ± ± — or dual supplies: 1.5V to Very low supply current drain (500 µA) — essentially independent of supply voltage Low input offset voltage: 2 mV Input common-mode voltage range includes ground Differential input voltage range equal to the power supply voltage Large output voltage swing: 0V to V... -
Page 35: Tda9885I
– Up to 12 pictures of 1/36th size (11 still and 1 moving) – Up to 6 pictures of 1/16th size (5 still and 1 moving) – Up to 3 pictures of 1/9th size (2 still and 1 moving) – Jointline free display –... - Page 36 • 4 MHz reference frequency input [signal from Phase-Locked Loop (PLL) tuning system] or operating as crystal oscillator • VIF Automatic Gain Control (AGC) detector for gain control, operating as peak sync detector for negative modulated signals and as a peak white detector for positive modulated signals •...
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Page 37: 17. Chassis Manual Adjustments Procedure
CVBS video output AGND analog ground VPLL VIF-PLL for loop filter supply voltage (+5 V) AFC output output 2 (open-collector) SIF1 SIF differential input 1 SIF2 SIF differential input 2 17. CHASSIS MANUAL ADJUSTMENTS PROCEDURE In order to enter the service menu, first enter the installation menu ( blue button on the remote control ) and then press the digits 4, 7, 2 and 5 respectively. - Page 38 ADJUST 31 16:9 EW Width ADJUST 32 16:9 EW Parabola Width ADJUST 33 16:9 EW Upper Corner Parabola ADJUST 34 16:9 EW Trapezium ADJUST 35 16:9 Horizontal Parallelogram ADJUST 36 16:9 Bow ADJUST 37 16:9 EW Lower Corner Parabola ADJUST 38 Cinema Vertical Zoom ADJUST 39 Cinema Vertical Scroll...
- Page 39 ADJUST 00 = White Point RED ADJUST 01 = White Point GREEN ADJUST 02 = White Point BLUE These adjustments’ factory settings are 026, 026, 030 respectively. AGC ADJUSTMENT: ADJUST 03 = AGC In order to do AGC adjustment, enter a 60dBmV RF signal level from channel C-12. Connect a digital voltmeter to pin 1 of the tuner.
- Page 40 Cinema mode for 4:3 CRTs Subtitle mode for 4:3 CRTs Zoom mode for 4:3 CRTs 4: 3 mode for 16:9 CRTs 16: 9 mode for 16:9 CRTs...
- Page 41 Cinema mode for 16: 9 CRTs Subtitle mode for 16: 9 CRTs Zoom mode for 16: 9 CRTs 4:3 VERTICAL ZOOM ADJUSTMENT: ADJUST 10 = Vertical Zoom Enter a PAL B/G circle test pattern via RF. Change vertical zoom till you see the upper and lower limit of the circle as close to the upper and lower limit of the picture tube as possible.
- Page 42 4:3 S-CORRECTION ADJUSTMENT: ADJUST 15 = 4 : 3 S-Correction Enter a PAL B/G circle test pattern via RF. Change S-correction till the middle part of the circle is as round as possible. 4:3 VERTICAL SHIFT ADJUSTMENT: ADJUST 16 = 4 : 3 Vertical Shift Enter a PAL B/G test pattern via RF.
- Page 43 Enter a PAL B/G test pattern via RF. Change TILT till horizontal and vertical lines at the corners of both sides of picture frame become vertical and parallel to vertical corner sides of picture tube. Check and readjust TILT item if the adjustment becomes improper after some other geometric adjustments are done.
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Page 44: Circuit Description
CIRCUIT DESCRIPTION (Refer to the Schematic Diagrams while reading this description) A) POWER SUPPLY The chassis incorporates a Motorola switch mode power supply using a MC44608 regulator controller IC. The circuit provides power to the receiver in both stand-by and normal operation modes. The DC voltages required at various parts of the chassis are provided by an SMPS transformer controlled by the IC MC44608, which is designed for driving, controlling and protecting switching transistor of SMPS. -
Page 45: Voltage Regulation
The VCC at pin 6 of IC106 operates between 6,6V and 13V in normal operation, when this voltage exceeds 15V then the IC output is disabled. VOLTAGE REGULATION After initial start up, the secondary voltages of TR101 are established. These voltages then need to be regulated to the required levels. - Page 46 200mA current source is flowing out of the pin 3 during the start–up phase and during the switching phase in case of the Pulsed Mode of operation. A resistor can be inserted between the sense resistor and the pin 3. Thus a programmable peak current detection can be performed during the SMPS stand–by mode.
- Page 47 MODE TRANSITION This chassis automatically selects stand-by mode when switched on.(For some special models this case is changed by software, according to the customer requests, such that TV selects the mode which was selected when the TV is turned off, whether directly power-off or first stand-by then power-off) The concept IC MC44608 is designed to detect the transitions between the stand-by and normal mode and to manage each mode in an optimal way.
- Page 48 SMPS SWITCH OFF When the mains is switched OFF, so long as the electrolytic bulk capacitor provides energy to the SMPS the controller remains in the switching phase. Then the peak current reaches its maximum peak value, the switching frequency decreases and all the secondary voltages are reduced.
- Page 49 to the standards and the micro controller uses these values to set the central frequency of the required channel. This mode is quicker than frequency mode. Frequency tuning is a new feature to this chassis. It takes the advantages of both VST and PLL tuning. As in PLL mode the tuning process is controlled via I²C bus, however the channels are not predefined in the software by a table, on the contrary these are scanned as in VST tuning mode but here the frequency changes, not the voltage.
- Page 50 VIDEO PATH In this chassis the TDA 8885 video-processor (IC200) is used. The filtered IF signals are processed and sent as CVBS signal to the video switch IC (IC201). In IC201, according to the software and user control, the output CVBS signal is selected whether from the tuner, SCARTS, BAV, BAV or SVHS (or if exists DVD, DVB or else).
- Page 51 inverted for this IC, is fed from pin63/64 of IC200. The outputs of IC600 are used for vertical deflection. B.C.L CIRCUIT (BEAM CURRENT LIMITER) Beam current limiting is employed to protect the circuitry in the receiver, the CRT and to prevent excessive X-ray radiation in fault conditions. The current drawn by the CRT is monitored by the current drawn through the winding of the fly-back transformer that produces the EHT for the CRT anode.
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Page 53: Schematic Diagrams
Audio Circuit... - Page 54 SVM Circuit...
- Page 56 +200V Deflection Circuit...
- Page 57 Dynamic Focus...
- Page 58 IF and Video...
- Page 59 Jack...
- Page 60 Micro-Controller...
- Page 61 SMPS...
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Page 62: Parts Lists
THE UPDATED PARTS LIST FOR THIS MODEL IS AVAILABLE ON ESTA... - Page 63 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...