VESTEL 11AK37 Manuale utente

SERVICE MANUAL

VESTEL CHASSIS 11AK37

MODEL

CONTENTS

SAFETY PRECAUTIONS: ................................................................................................................................... 2

TV set switched off .......................................................................................................................................... 2

Measu ements ................................................................................................................................................ 2

PERI-TV SOCKET ............................................................................................................................................... 2

SCART 1 2

SCART 2 2

1. INTRODUCTION ............................................................................................................................................. 2

2.SMALL SIGNAL PART WITH STV2248 ........................................................................................................... 3

2.1 Vision IF amplifie ................................................................................................................................... 3

2.2 QSS Sound ci cuit (QSS ve sions) ......................................................................................................... 3

2.3 FM demodulato and audio amplifie (mono ve sions) ......................................................................... 3

2.4 Video switch ............................................................................................................................................ 3

2.5 Synch onisation ci cuit ............................................................................................................................ 3

2.6 Ch oma and luminance p ocessing ...................................................................................................... 4

2.7 RGB output ci cuit ................................................................................................................................... 4

2.8 µ-Cont olle ............................................................................................................................................. 4

3. TUNER ............................................................................................................................................................ 5

4- MULTISTANDARD SOUND PROCESSOR .................................................................................................... 5

5. SOUND OUTPUT STAGE TDA7269A ............................................................................................................. 5

6. VERTICAL OUTPUT STAGE WITH STV9306 ............................................................................................. 5-6

7. VIDEO OUTPUT AMPLIFIER STV5112 ........................................................................................................... 6

8. POWER SUPPLY (SMPS) ............................................................................................................................... 6

9. POWER FACTOR CORRECTION .................................................................................................................. 6

10. SERIAL ACCESS CMOS 8K EEPROM 24C08 ............................................................................................. 6

11. CLASS AB STEREO HEADPHONE DRIVER TDA1308 ................................................................................ 6

12. CLASS AB MONO SUBWOOFER DRIVER TDA7261 ................................................................................... 6

13. SAW FILTERS ............................................................................................................................................... 6

14. IC DESCRIPTIONS AND INTERNAL BLOCK DIAGRAM .............................................................................. 6

 ST92195 ....................................................................................................................................................... 7

 STV224X ................................................................................................................................................... 7-8

 UV1315, UV1316, UV1336 ...................................................................................................................... 8-9

 TDA7269A .................................................................................................................................................. 10

 STV9306 ..................................................................................................................................................... 10

 STV5112 ..................................................................................................................................................... 11

 MC44608 .................................................................................................................................................... 11

 MSP 34XXG ................................................................................................................................................ 12

 24C08 ................................................................................................................................................... 12-13

 TDA1308 .................................................................................................................................................... 13

 TDA7261 .................................................................................................................................................... 13

 SAW FILTERS ............................................................................................................................................. 14

15.CIRCUIT DESCCIRIPTION ................................................................................................................... 15-19

16.AK37 CHASSIS MANUAL ADJUSTMENT PROCEDURE ...................................................................... 20-22

17.OPTION SETTING ................................................................................................................................. 23-25

18.TUNER SETTING ........................................................................................................................................ 26

19.GENERAL BLOCK DIAGRAM of CHASSIS 11AK37 .................................................................................... 27

20.AK37 / TITANIUM - Languages G oups ....................................................................................................... 28

21.AK37 PROJECT BLOCK DIAGRAMS .......................................................................................................... 29

21.1 BLOCK DIAGRAM ................................................................................................................................. 30

21.2 SMPS BLOCK DIAGRAM ....................................................................................................................... 31

21.3 MICRO CONTROLLER BLOCK DIAGRAM ........................................................................................... 32

21.4 VIDEO BLOCK DIAGRAM ...................................................................................................................... 33

21.5 STEREO BLOCK DIAGRAM .................................................................................................................. 34

21.6 SCART BLOCK DIAGRAM ..................................................................................................................... 35

21.7 DEFLECTIOAN BLOCK DIAGRAM ........................................................................................................ 36

21.8 BASE BOADR BLOCK DIAGRAM .......................................................................................................... 37

22. CIRCUIT DIAGRAMS .................................................................................................................................. 38

22.1 SMPS CIRCUIT DIAGRAM .................................................................................................................... 38

22.2 MICRO CONTROLLER CIRCUIT DIAGRAM ......................................................................................... 39

22.3 VIDEO CIRCUIT DIAGRAM ................................................................................................................... 40

22.4 STEREO CIRCUIT DIAGRAM ............................................................................................................... 41

22.5 SCART CIRCUIT DIAGRAM .................................................................................................................. 42

22.6 BASE BOARD CIRCUIT DIAGRAM ....................................................................................................... 43

22.7 CRT BOARD CIRCUIT DIAGRAM ......................................................................................................... 44

DO NOT CHANGE ANY MODULE UNLESS THE SET IS SWITCH OFF

The mains supply side of the switch mode power supply transformer is live.

Use an isolating transformer.

The receivers fulfill completely the safety requirements.

Safety precautions

Servicing of this TV should only be carried out by a qualified person. Components marked with the warning symbol

on the circuit diagram are critical for safety and must only be replaced with an identical component.

- ower resistor and fusable resistors must be mounted in an identical manner to the original component.

TV Set switched off

Make short-circuit between HV-CRT clip and CRT ground layer.

Short C809 before changing IC800 end IC801 or other components in primary side of SM S part.

Measurements

Voltage readings and oscilloscope traces are measured under following conditions.

Antenna signals level is 60dB at the color bar pattern from the TV pattern generator.(100% white,75% colour saturation)

Brightness, contrast, and color are adjusted for normal picture perfomance.

Mains supply, 220VAC, 50Hz.

PERI-TV SOCKET

SCART 1 PINING SCART 2 PINING

1 Audio right output 0.5Vrms / 1K 1 Audio right output 0.5Vrms / 1K

2 Audio right input 0.5Vrms / 10K 2 Audio right input 0.5Vrms / 10K

3 Audio left output 0.5Vrms / 1K 3 Audio left output 0.5Vrms / 1K

4 Ground AF 4 Ground AF

5 Ground Blue 5 Ground Blue

6 Audio left input 0.5Vrms / 10K 6 Audio left input 0.5Vrms / 10K

7 Blue input 0.7Vpp / 75ohm 7 Blue input

8 AV switching input 0-12VDC /10K 8 AV switching input 0-12VDC /10K

9 Ground Green 9 Ground Green

10 - 10 -

11 Green input 0.7Vpp / 75ohm 11 -

12 - 12 -

13 Ground Red 13 Ground Red

14 Ground Blanking 14 Ground Blanking

15 Red input 0.7Vpp / 75ohm 15 -

16 Blanking input 0-0.4VDC, 1-3VDC / 75ohm 16 -

17 Ground CVBS output 17 Ground CVBS output

18 Ground CVBS input 18 Ground CVBS input

19 CVBS output 1Vpp / 75ohm 19 CVBS output 1Vpp / 75ohm

20 CVBS input 1Vpp / 75ohm 20 CVBS input 1Vpp / 75ohm

21 Ground 21 Ground

1. INTRODUCTION

11AK37 is a 110° chassis capable of driving 25, 28, 29, 33 4:3 and 28, 32 16:9 tubes at the appropriate currents.

The chassis is capable of operating in AL, SECAM and NTSC standards and multiple transmission standards as B/G,

D/K, I/I, and L/L´. standards. The sound system is capable of giving 12 watts RMS output into a load of 8 ohms.

One page, 7 page SIM LETEXT, TO TEXT, FASTTEXT and US Closed Caption is also provided. The chassis is

equipped with a double-deck 42 pin scart connector for AV input/output, front-AV input, one back-AV output, one SVHS,

one headphone and one subwoofer.

2. SMALL SIGNAL PART WITH STV2248:

STV2248 video processor is essential for realizing all small signal functions for a color TV receiver.

2.1 Vision IF amplifier

The vision IF amplifier can demodulate signals with positive and negative modulation. The LL demodulator is

completely alignment-free. Although the VCO (Toko-coil) of the LL circuit is external, yet the frequency is fixed to the

required value by the original manufacturer thus the Toko-coil does not need to be adjusted manually. The setting of the

various frequencies (38.9 or 45.75 MHz) can be made via changing the coil itself

2.2 QSS Sound circuit (QSS versions)

The sound IF amplifier is similar to the vision IF amplifier and has an external AGC de-coupling capacitor. The single

reference QSS mixer is realised by a multiplier. In this multiplier the SIF signal is converted to the inter-carrier frequency

by mixing it with the regenerated picture carrier from the VCO. The mixer output signal is supplied to the output via a

high-pass filter for attenuation of the residual video signals. With this system a high performance hi-fi stereo sound

processing can be achieved. The AM sound demodulator is realised by a multiplier. The modulated sound IF signal is

multiplied in phase with the limited SIF signal. The demodulator output signal is supplied to the output via a low-pass

filter for attenuation of the carrier harmonics. The AM signal is supplied to the output via the volume control.

The AM demodulated signal results from multiplying the input signal by itself, it is available on AM/FM output.

2.3 FM demodulator and audio amplifier (mono versions)

The FM demodulator is realized as narrow-band LL with external loop filter, which provides the necessary selectivity

without using an external band-pass filter. To obtain a good selectivity a linear phase detector and constant input signal

amplitude are required. For this reason the inter-carrier signal is internally supplied to the demodulator via a gain

controlled amplifier and AGC circuit. The nominal frequency of the demodulator is tuned to the required frequency

(4.5/5.5/6.0/6.5 MHz) by means of a calibration circuit that uses the clock frequency of the µ-controller/Teletext decoder

as a reference. The setting to the wanted frequency is realized by means of the software. It can be read whether the LL

frequency is inside or outside the window and whether the LL is in lock or not. With this information it is possible to

make an automatic search system for the incoming sound frequency. This is realized by means of a software loop that

alternate the demodulator to various frequencies, then select the frequency on which a lock condition has been found.

De-emphasis output signal amplitude is independent of the TV standard and has the same value for a frequency deviation

of ±25 kHz at the 4.5 MHz standard and for a deviation of ±50 kHz for the other standards. When the IF circuit is

switched to positive modulation the internal signal on de-emphasis pin is automatically muted. The audio control circuit

contains an audio switch and volume control. In the mono inter-carrier sound versions the Automatic Volume Leveling

(AVL) function can be activated. The pin to which the external capacitor has to be connected depends on the IC version.

2.4 Video switching

The video processor (STV2248C) has three CVBS inputs and two RGB inputs. The first CVBS input is used for external

CVBS from SCART 1, the second is used for either CVBS or Y/C from either SCART2 or BAV/FAV or SVHS, and the

third one is used for internal video. The selection between both external video inputs signals is realized by means of

software and hardware switches.

2.5 Synchronization circuit

The video processor (STV224X) performs the horizontal and vertical processing. The external horizontal deflection circuit

is controlled via the Horizontal output pulse (HOUT). The vertical scanning is performed through an external ramp

generator and a vertical power amplifier IC controlled by the Vertical output pulse (VOUT).

The main components of the deflection circuit are:

 LL1: the first phase locked loop that locks the internal line frequency reference on the

CVBS input signal. It is composed of an integrated VCO (12 MHz) that requires the chroma reference frequency

(4.43MHz or 3.58MHz crystal oscillator reference signal), a divider by 768, a line decoder, and a phase comparator.

 LL2: The second phase locked loop that controls the phase of the horizontal output

(Compensation of horizontal deflection transistor storage time variation). Also the horizontal position adjustment is

also performed in LL2.

 A vertical pulse extractor.

 A vertical countdown system to generate all vertical windows (vertical synchronization window, frame blanking pulses,

50/60Hz identification window...).

 Automatic identification of 50/60Hz scanning.

 LL1 time constant control.

 Noise detector, video identification circuits, and horizontal coincidence detector.

 Vertical output stage including de-interlace function, vertical position control.

 Vertical amplitude control voltage output (combined with chroma reference output and Xtal 1 indication).

2.6 Chroma and luminance processing

The chroma decoder is able to demodulate AL, NTSC and SECAM signals.

The decoder dedicated to AL and NTSC sub-carrier is based on a synchronous demodulator, and an Xtal LL locked on

the phase reference signal (burst).

The SECAM demodulation is based on a LL with automatic calibration loop.

The color standard identification is based on the burst recognition.

Automatic and forced modes can be selected through the I 2C bus.

NTSC tint, and auto flesh are controlled through I 2C bus.

Xtal LL can handle up to 3 crystals to work in AL M, AL N and NTSC M for South America.

ACC an ACC overload control the chroma sub-carrier amplitude within 26dB range. Both

ACC s are based on digital systems and do not need external capacitor.

All chroma filters are fully integrated and tuned via a LL locked on Xtal VCO signal.

A second LL is used for accurate fine-tuning of the SECAM bell filter. This tuning is achieved during the frame blanking.

An external capacitor memorizes the bell filter tuning voltage.

A base-band chroma delay-line rebuilds the missing color line in SECAM and removes transmission phase errors in AL.

The base-band chroma delay line is clocked with 6MHz signal provided by the horizontal scanning VCO.

The luminance processor is composed of a chroma trap filter, a luminance delay line, a peaking function with noise

coring feature, a black stretch circuit.

Trap filter and luminance delay lines are achieved with the use of bi-quad integrated filters, auto-aligned via a master

filter phase locked loop.

2.7 RGB output circuit

The video processor performs the R, G, B processing.

There are three sources:

1. Y,U,V inputs (coming from luma part (Y output), and chroma decoder outputs (R-Y, B-Y outputs).

2. External R,G,B inputs from SCART (converted internally in Y,U,V), with also the possibility to input YUV signals from

a DVD player, (YUV specification is Y=0.7 V , U= 0.7 V , V = 0.7V for 100% color bar).

3. Internal R,G,B inputs (for OSD and Teletext display)

The main functions of the video part are:

 Y,U,V inputs with integrated clamp loop, allowing a DC link with YUV outputs,

 External RGB inputs (RGB to YUV conversion), or direct YUV inputs,

 Y,U,V switches,

 Contrast, saturation, brightness controls,

 YUV to RGB matrix,

 OSD RGB input stages (with contrast control),

 RGB switches,

 A R function,

 DC adjustment of red and green channels,

 Drive adjustments (R, G, B gain),

 Digital automatic cut-off loop control,

 Manual cut-off capability with I 2C adjustments,

 Half tone, oversize blanking, external insertion detection, blue screen,

 Blanking control and RGB output stages.

2.8 µ-Controller

The ST92195 is the micro-controller, which is required for a color TV receiver. ST92195D1 is the version with one page

Teletext and ST92195D7 is the one with 7 page Teletext. The IC has the supply voltages of 5 V and they are mounted in

SDI package with 56 pins.

µ-Controller has the following features

 Display of the program number, channel number, TV Standard, analogue values, sleep timer, parental control and mute

is done by OSD

 Single LED for standby and on mode indication

 System configuration with service mode

 3 level logic output for SECAM and Tuner band switching

3. TUNER

Either a LL or a VST tuner is used as a tuner.

UV1316 (VHF/UHF) is used as a LL tuner. For only AL M/N, NTSC M applications UV 1336 is used as the LL tuner.

UV 1315 (VHF/UHF) is used as a VST Tuner.

Channel coverage of UV1316

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Noise Typical Max. Gain Min. Typical Max.

Low band : 5dB 9dB All channels : 38dB 44dB 52dB

Mid band : 5dB 9dB Gain Taper (of-air channels) : 8dB

High band : 6dB 9dB

Channel Coverage UV1336

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(2). Enough margin is available to tune up to 863.25 MHz.

Noise Typ. Max. Gain Min. Typ. Max.

Low band : 6dB 9dB All Channels : 38dB 44dB 50dB

Mid band : 6dB 10dB Gain Taper : 8dB

High band : 6dB 11dB (off-air channels)

4. MULTISTANDARD SOUND PROCESSOR

The MS 34xxG is designed to perform demodulation of FM or AM-Mono TV sound. Three kinds of MS s are used:

MS 3400G,MS 3410G and MS 3411G. The MS 3400G is fully pin and software-compatible to the MS 3410G,

but is not able to decode NICAM. It is also compatible to the MS 3411G,sound processor IC with virtual dolby sound.

5. SOUND OUTPUT STAGETDA7269A

The TDA7269A is a class AB dual Audio power amplifier, specially designed for high quality sound applications as

Hi-Fi music centers and TV sets. It is supplied by ±12VDC coming from two separate windings in the SM S transformer.

It gives 2x14W(THD=10%) output power into an 8ohm load.

6. VERTICAL OUTPUT STAGE WITH STV9306

The STV9306 is a fully I2C controlled vertical deflection IC designed for use in 110°, 4/3 or 16/9 CRT applications.

It integrates both the vertical deflection and E/W correction circuitries necessary in design of a 110° chassis.

7. VIDEO OUTPUT AMPLI IER STV5112

The STV5112 consists of three monolithic video output amplifiers. The amplifier can be seen as an operational

amplifier with negative feedback. The advantage of negative feedback is that the amplifier characteristics do not play

an important role up to certain frequencies. The internal flash diodes protect the amplifiers against flash over in the

picture tube. The only protections required at the cathode outputs are a flash resistor and a spark gap.

Furthermore, the device has a high voltage power supply (VDD) and a low voltage one (VCC).

8. POWER SUPPLY (SMPS)

The DC voltages required at various parts of the chassis are provided by an SM S transformer controlled by the

IC MC44608 which is designed for driving, controlling and protecting switching transistor of SM S. The transformer

produces 150V for FBT input, ±12V for audio output IC, +5V and +8V for ST92195.

9. POWER ACTOR CORRECTION

assive components are used for the solution of power factor correction.

10. SERIAL ACCESS CMOS 8K EEPROM 24C08

The 24C08 is a 8Kbit electrically erasable programmable memory (EE ROM), organized as 4 blocks of 256*08 bits.

The memory is compatible with the I²C standard, two wire serial interface which uses a bi-directional data bus and serial

clock.

11. CLASS AB STEREO HEADPHONE DRIVER TDA1308

The TDA1308 is an integrated class AB stereo headphone driver contained in a DI 8 plastic package.

12. CLASS AB MONO SUBWOO ER DRIVER TDA7261

The TDA7261 is a class AB dual Audio power amplifier, specially designed for high quality sound applications in mono

TV chassis. It is supplied by ±12VDC.

13. SAW ILTERS

Saw filter type Model

G1975M AL B/G MONO

K2966M AL SECAM B/G/D/K/I MONO

J1981 AL-I MONO

K2958M AL-SECAM B/G-D/K (38) MONO

K2962M AL-SECAM B/G/D/K/I/L/L MONO

L9653M SECAM L/L AM MONO (AUDIO IF)

G3967M AL-SECAM B/G STEREO (VIDEO IF)

G9353M AL-SECAM B/G STEREO (AUDIO IF)

K3958M AL-SECAM B/G/D/K/I/L/L STEREO (VIDEO IF)

K9356M AL-SECAM B/G/D/K/I STEREO (AUDIO IF)

K9656M AL-SECAM B/G/D/K/I/L/L STEREO (AUDIO IF)

K3958M AL I NICAM (VIDEO IF)

K9356M AL I NICAM (AUDIO IF)

M1962M AL M/N NTSC M MONO

M3953M AL M/N NTSC M STEREO (VIDEO IF)

M9370M AL M/N NTSC M STEREO (AUDIO IF)

IC DESCRIPTIONS AND INTERNAL BLOCK DIAGRAM

 ST92195

 STV224X

 TUNER (UV1315, UV1316, UV1336)

 TDA7269A

 STV9306

 STV5112

 MC44608

 MS 34XXG

 24C08

 TDA1308

 SAW FILTERS

G1975M, K2966M, K2962M, L9653M, G3962M, G9353M, K3958M, K9356M, K9656M, K6263K, K9652M,

M1962M, M3953M, M9370M

ST92195

The ST92195 is a member of the ST9+ family of micro-controllers, completely developed and produced by

SGS-THOMSON Microelectronics using a proprietary n-well HCMOS process. The nucleus of the ST92195 is the

advanced Core, which includes the Central rocessing Unit (C U), the ALU, the Register File and the interrupt controller.

The Core has independent memory and register buses to add to the efficiency of the code. A set of on-chip peripherals

form a complete sys-tem for TV set and VCR applications:

 Voltage Synthesis

 V S/WSS Slicer

 Teletext Slicer

 Teletext Display RAM

 OSD

Additional peripherals include a watchdog timer, a serial peripheral interface (S I), a 16-bit timer and an A/D converter.

STV224X Video processor:

The STV2246/2247/2248 are fully bus controlled ICs for TV including IF, SIF, luma, chroma and deflection processing.

Used with a vertical frame booster (TDA1771 or TDA8174 for 90° chassis, STV9306 for 110° chassis), they allow the

design of multi-standard (BGDKIMNLL, AL/ SECAM/NTSC) sets with very few external components and no manual

adjustments.

UV1315, UV1316, UV1336

General description of UV1315

The UV1315 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.

Features of UV1315

 Member of the UV1300 family small sized UHF/VHF tuners

 Systems CCIR:B/G, H, L, L, I and I; OIRT:D/K

 Voltage synthesized tuning (VST)

 Off-air channels, S-cable channels and Hyper-band

 Standardized mechanical dimensions and pinning

PINNING PIN VALUE

1. Gain control voltage (AGC) : 4.0V, Max:4.5V

2. Tuning voltage

3. High band switch : 5V, Min:4.75V, Max:5.5V

4. Mid band switch : 5V, Min:4.75V, Max:5.5V

5. Low band switch : 5V, Min:4.75V, Max:5.5V

6. Supply voltage : 5V, Min:4.75V, Max:5.5V

7. Not connected

8. Not connected

9. Not connected

10. Symmetrical IF output 1

11. Symmetrical IF output 2

Band switching table:

+,*+%$1' 9

9

0,'%$1' 9 9

99

/2:%$1' 9 9

3,1 3,1 3,1

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.

Features of UV1316

 Member of the UV1300 family small sized UHF/VHF tuners

 Systems CCIR: B/G, H, L, L, I and I; OIRT: D/K

 Digitally controlled ( LL) tuning via I²C-bus

 Off-air channels, S-cable channels and Hyper-band

 World standardized mechanical dimensions and world standard pinning

 Complies to CENELEC EN55020 and EN55013

PINNING PIN VALUE

1. Gain control voltage (AGC) : 4.0V, Max:4.5V

2. Tuning voltage

3. I²C-bus address select : Max:5.5V

4. I²C-bus serial clock : Min:-0.3V, Max:5.5V

5. I²C-bus serial data : Min:-0.3V, Max:5.5V

6. Not connected

7. LL supply voltage : 5.0V, Min:4.75V, Max:5.5V

8. ADC input

9. Tuner supply voltage : 33V, Min:30V, Max:35V

10.Symmetrical IF output 1

11.Symmetrical IF output 2

General description of UV1336

UV1336 series is developed for reception of channels broadcast in accordance with the M, N standard.

Features of UV1336

 Global standard pinning

 Integrated Mixer-Oscillator & LL function

 Conforms to CIS R 13, FCC and DOC (Canada) regulations

 Low power consumption

 Both phono connector and F connector are available

PINNING PIN VALUE

1. Gain control voltage : 4.0V, Max:4.5V

2. Tuning voltage

3. Address select : Max:5.5V

4. Serial clock : Min:-0.3V, Max:5.5V

5. Serial data : Min:-0.3V, Max:5.5V

6. Not connected

7. Supply voltage : 5.0V, Min:4.75V, Max:5.5V

8. ADC input (optional)

9. Tuning supply voltage : 33V, Min:30V, Max:35V

10.Ground

11. IF output

Indice

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