Datasheet SK7.0L CA Datasheet (Philips)

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Page 1

Color Television Chassis

21SL7

SK7.0L

21SL7

Contents Page

1. Revision List 2

2. Technical Specifications and Connections 2

3. Precautions, Notes, and Abbreviation List 3

4. Mechanical Instructions 7

5. Service Modes, Error Codes, and Fault Finding 8

6. Alignments 9

7. Circuit Descriptions 21

8. IC Data Sheets 22

9. Block Diagrams PWB locations 27 Block Diagram Chassis 28

10. Circuit Diagrams and PWB Layouts Diagram PWB 21SL7 Schematic Overview Chassis CRT panel (B) 32 32

(A) 29 30-31

Copyright 2010 Koninklijke Philips Electronics N.V. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise without the prior permission of Philips.

Published by JA/JY 1064 BU TV Consumer Care, the Netherlands Subject to modification EN 3122 785 18950

2010-Apr-16

Page 2

EN 2 SK7.0L CA1.

Revision List

1. Revision List

Manual xxxx xxx xxxx.0

• First release.

2. Technical Specifications and Connections

Index of this chapter:

2.1 Technical Specifications

2.2 Directions for Use

2.3 Connection Overview

2.4 Chassis Overview

Note: Data below can deviate slightly from the actual situation, due to the different set executions.

2.1 Technical Specifications

For on-line product support please use the links in Table 2-1. Here is product information available, as well as getting started, user manuals, frequently asked questions and software & drivers.

Table 2-1 Described Model numbers

CTN Styling Published in:

21PT9460/55

21SL7 3122 785 18950

2.2 Directions for Use

You can download this information from the following websites:

http://www.philips.com/support http://www.p4c.philips.com

2.3.1 Connections

Figure 2-1 Rear and front connections

Monitor out cinch: Video CVBS - Out, Audio - Out

Ye - Video CVBS 1 V Wh - Audio L 0.5 V Rd - Audio R 0.5 V

AV in cinch: Video CVBS - In, Audio - In

Ye - Video CVBS 1 V Wh - Audio L 0.5 V Rd - Audio R 0.5 V

CVI in cinch: Video YPbPr - In

Gn - Video Y 1 V Bu - Video Pb 0.7 V Rd - Video Pr 0.7 V

/ 75 ohm kq

/10 kohm kq

RMS

/ 10 kohm kq

RMS

/ 75 ohm jq

/ 10 kohm jq

RMS

/ 10 kohm jq

RMS

/ 75 ohm jq

2.3 Connection Overview

Note: The following connector color abbreviations are used

(acc. to DIN/IEC 757): Bk= Black, Bu= Blue, Gn= Green, Gy= Grey, Rd= Red, Wh= White, and Ye= Yellow.

2.4 Chassis Overview

Refer to chapter 9. Block Diagrams for PWB/CBA locations.

Aerial - In

- - F-connector Coax, 75 ohm D

Front in cinch: Video CVBS - In, Audio - In

Ye - Video CVBS 1 V Wh - Audio L 0.5 V Rd - Audio R 0.5 V

/ 75 ohm jq

/ 10 kohm jq

RMS

/ 10 kohm jq

RMS

2010-Apr-16

Page 3

Precautions, Notes, and Abbreviation List

3. Precautions, Notes, and Abbreviation List

EN 3SK7.0L CA 3.

Index of this chapter:

3.1 Safety Instructions

3.2 Maintenance Instructions

3.3 Warnings

3.4 Notes

3.5 Abbreviation List

3.1 Safety Instructions

Safety regulations require the following during a repair:

• Connect the set to the Mains/AC Power via an isolation transformer (> 800 VA).

• Replace safety components, indicated by the symbol h, only by components identical to the original ones. Any other component substitution (other than original type) may increase risk of fire or electrical shock hazard.

• Wear safety goggles when you replace the CRT.

Safety regulations require that after a repair, the set must be returned in its original condition. Pay in particular attention to the following points:

• General repair instruction: as a strict precaution, we advise you to re-solder the solder connections through which the horizontal deflection current flows. In particular this is valid for the:

1. Pins of the line output transformer (LOT).

2. Fly-back capacitor(s).

3. S-correction capacitor(s).

4. Line output transistor.

5. Pins of the connector with wires to the deflection coil.

6. Other components through which the deflection current

flows.

Note: This re-soldering is advised to prevent bad connections due to metal fatigue in solder connections, and is therefore only necessary for television sets more than two years old.

• Route the wire trees and EHT cable correctly and secure them with the mounted cable clamps.

• Check the insulation of the Mains/AC Power lead for external damage.

• Check the strain relief of the Mains/AC Power cord for proper function, to prevent the cord from touching the CRT, hot components, or heat sinks.

• Check the electrical DC resistance between the Mains/AC Power plug and the secondary side (only for sets that have a Mains/AC Power isolated power supply):

1. Unplug the Mains/AC Power cord and connect a wire

between the two pins of the Mains/AC Power plug.

2. Set the Mains/AC Power switch to the "on" position

(keep the Mains/AC Power cord unplugged!).

3. Measure the resistance value between the pins of the

Mains/AC Power plug and the metal shielding of the tuner or the aerial connection on the set. The reading should be between 4.5 Mohm and 12 Mohm.

4. Switch "off" the set, and remove the wire between the

two pins of the Mains/AC Power plug.

• Check the cabinet for defects, to prevent touching of any inner parts by the customer.

3.2 Maintenance Instructions

We recommend a maintenance inspection carried out by qualified service personnel. The interval depends on the usage conditions:

• When a customer uses the set under normal circumstances, for example in a living room, the recommended interval is three to five years.

• When a customer uses the set in an environment with higher dust, grease, or moisture levels, for example in a kitchen, the recommended interval is one year.

• The maintenance inspection includes the following actions:

1. Perform the “general repair instruction” noted above.

2. Clean the power supply and deflection circuitry on the chassis.

3. Clean the picture tube panel and the neck of the picture tube.

3.3 Warnings

• In order to prevent damage to ICs and transistors, avoid all high voltage flashovers. In order to prevent damage to the picture tube, use the method shown in figure “Discharge picture tube”, to discharge the picture tube. Use a high voltage probe and a multi-meter (position V until the meter reading is 0 V (after approx. 30 s).

Figure 3-1 Discharge picture tube

• All ICs and many other semiconductors are susceptible to electrostatic discharges (ESD w). Careless handling during repair can reduce life drastically. Make sure that, during repair, you are connected with the same potential as the mass of the set by a wristband with resistance. Keep components and tools also at this same potential.

• Be careful during measurements in the high voltage section.

• Never replace modules or other components while the unit is switched "on".

• When you align the set, use plastic rather than metal tools. This will prevent any short circuits and prevents circuits from becoming unstable.

3.4 Notes

3.4.1 General

• Measure the voltages and waveforms with regard to the chassis (= tuner) ground (H), or hot ground (I), depending on the tested area of circuitry. The voltages and waveforms shown in the diagrams are indicative. Measure them in the Service Default Mode (see chapter 5) with a color bar signal and stereo sound (L: 3 kHz, R: 1 kHz unless stated otherwise) and picture carrier at 475.25 MHz for PAL, or

61.25 MHz for NTSC (channel 3).

• Where necessary, measure the waveforms and voltages with (D) and without (E) aerial signal. Measure the voltages in the power supply section both in normal operation (G) and in stand-by (F). These values are indicated by means of the appropriate symbols.

• The semiconductors indicated in the circuit diagram and in the parts lists, are interchangeable per position with the semiconductors in the unit, irrespective of the type indication on these semiconductors.

• Manufactured under license from Dolby Laboratories. “Dolby”, “Pro Logic” and the “double-D symbol”, are trademarks of Dolby Laboratories.

). Discharge

E_06532_007.eps

250304

2010-Apr-16

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EN 4 SK7.0L CA3.

Precautions, Notes, and Abbreviation List

3.4.2 Schematic Notes

• All resistor values are in ohms, and the value multiplier is often used to indicate the decimal point location (e.g. 2K2 indicates 2.2 kohm).

• Resistor values with no multiplier may be indicated with either an "E" or an "R" (e.g. 220E or 220R indicates 220 ohm).

• All capacitor values are given in micro-farads (μ= x10 nano-farads (n= x10

-9

), or pico-farads (p= x10

• Capacitor values may also use the value multiplier as the decimal point indication (e.g. 2p2 indicates 2.2 pF).

• An "asterisk" (*) indicates component usage varies. Refer to the diversity tables for the correct values.

• The correct component values are listed in the Spare Parts List. Therefore, always check this list when there is any doubt.

3.4.3 Lead-free Soldering

Due to lead-free technology some rules have to be respected by the workshop during a repair:

• Use only lead-free soldering tin Philips SAC305 with order code 0622 149 00106. If lead-free solder paste is required, please contact the manufacturer of your soldering equipment. In general, use of solder paste within workshops should be avoided because paste is not easy to store and to handle.

• Use only adequate solder tools applicable for lead-free soldering tin. The solder tool must be able: – To reach a solder-tip temperature of at least 400°C. – To stabilize the adjusted temperature at the solder-tip. – To exchange solder-tips for different applications.

• Adjust your solder tool so that a temperature of around 360°C - 380°C is reached and stabilized at the solder joint. Heating time of the solder-joint should not exceed ~ 4 sec. Avoid temperatures above 400°C, otherwise wear-out of tips will increase drastically and flux-fluid will be destroyed. To avoid wear-out of tips, switch “off” unused equipment or reduce heat.

• Mix of lead-free soldering tin/parts with leaded soldering tin/parts is possible but PHILIPS recommends strongly to avoid mixed regimes. If this cannot be avoided, carefully clear the solder-joint from old tin and re-solder with new tin.

3.4.4 Alternative BOM identification

The third digit in the serial number (example: AG2B0335000001) indicates the number of the alternative B.O.M. (Bill Of Materials) that has been used for producing the specific TV set. In general, it is possible that the same TV model on the market is produced with e.g. two different types of displays, coming from two different suppliers. This will then result in sets which have the same CTN (Commercial Type Number; e.g. 28PW9515/12) but which have a different B.O.M. number. By looking at the third digit of the serial number, one can identify which B.O.M. is used for the TV set he is working with. If the third digit of the serial number contains the number “1” (example: AG1B033500001), then the TV set has been manufactured according to B.O.M. number 1. If the third digit is a “2” (example: AG2B0335000001), then the set has been produced according to B.O.M. no. 2. This is important for ordering the correct spare parts! For the third digit, the numbers 1...9 and the characters A...Z can be used, so in total: 9 plus 26= 35 different B.O.M.s can be indicated by the third digit of the serial number.

Identification: The bottom line of a type plate gives a 14-digit serial number. Digits 1 and 2 refer to the production center (e.g. AG is Bruges), digit 3 refers to the B.O.M. code, digit 4 refers to the Service version change code, digits 5 and 6 refer to the production year, and digits 7 and 8 refer to production week (in

2010-Apr-16

-12

example below it is 2006 week 17). The 6 last digits contain the serial number.

MODEL :

PROD.NO:

-6

32PF9968/10

AG 1A0617 000001

MADE IN BELGIUM

220-240V 50/60Hz

VHF+S+H+UHF

BJ3.0E LA

128W

E_06532_024.eps

260308

Figure 3-2 Serial number (example)

3.4.5 Board Level Repair (BLR) or Component Level Repair (CLR)

If a board is defective, consult your repair procedure to decide if the board has to be exchanged or if it should be repaired on component level. If your repair procedure says the board should be exchanged completely, do not solder on the defective board. Otherwise, it cannot be returned to the O.E.M. supplier for back charging!

3.4.6 Practical Service Precautions

• It makes sense to avoid exposure to electrical shock.

While some sources are expected to have a possible dangerous impact, others of quite high potential are of limited current and are sometimes held in less regard.

• Always respect voltages. While some may not be

dangerous in themselves, they can cause unexpected reactions that are best avoided. Before reaching into a powered TV set, it is best to test the high voltage insulation. It is easy to do, and is a good service precaution.

3.5 Abbreviation List

0/6/12 SCART switch control signal on A/V

board. 0 = loop through (AUX to TV), 6 = play 16 : 9 format, 12 = play 4 : 3 format

AARA Automatic Aspect Ratio Adaptation:

ACI Automatic Channel Installation:

ADC Analogue to Digital Converter AFC Automatic Frequency Control: control

AGC Automatic Gain Control: algorithm that

AM Amplitude Modulation AP Asia Pacific AR Aspect Ratio: 4 by 3 or 16 by 9 ASF Auto Screen Fit: algorithm that adapts

ATSC Advanced Television Systems

ATV See Auto TV Auto TV A hardware and software control

AV External Audio Video AVC Audio Video Controller

algorithm that adapts aspect ratio to remove horizontal black bars; keeps the original aspect ratio

algorithm that installs TV channels directly from a cable network by means of a predefined TXT page

signal used to tune to the correct frequency

controls the video input of the feature box

aspect ratio to remove horizontal black bars without discarding video information

Committee, the digital TV standard in the USA

system that measures picture content, and adapts image parameters in a dynamic way

Page 5

Precautions, Notes, and Abbreviation List

EN 5SK7.0L CA 3.

AVIP Audio Video Input Processor B/G Monochrome TV system. Sound

carrier distance is 5.5 MHz BLR Board-Level Repair BTSC Broadcast Television Standard

Committee. Multiplex FM stereo sound

system, originating from the USA and

used e.g. in LATAM and AP-NTSC

countries B-TXT Blue TeleteXT C Centre channel (audio) CEC Consumer Electronics Control bus:

remote control bus on HDMI

connections CL Constant Level: audio output to

connect with an external amplifier CLR Component Level Repair ComPair Computer aided rePair CP Connected Planet / Copy Protection CSM Customer Service Mode CTI Color Transient Improvement:

manipulates steepness of chroma

transients CVBS Composite Video Blanking and

Synchronization DAC Digital to Analogue Converter DBE Dynamic Bass Enhancement: extra

low frequency amplification DDC See “E-DDC” D/K Monochrome TV system. Sound

carrier distance is 6.5 MHz DFI Dynamic Frame Insertion DFU Directions For Use: owner's manual DMR Digital Media Reader: card reader DMSD Digital Multi Standard Decoding DNM Digital Natural Motion DNR Digital Noise Reduction: noise

reduction feature of the set DRAM Dynamic RAM DRM Digital Rights Management DSP Digital Signal Processing DST Dealer Service Tool: special remote

control designed for service

technicians DTCP Digital Transmission Content

Protection; A protocol for protecting

digital audio/video content that is

traversing a high speed serial bus,

such as IEEE-1394 DVB-C Digital Video Broadcast - Cable DVB-T Digital Video Broadcast - Terrestrial DVD Digital Versatile Disc DVI(-d) Digital Visual Interface (d= digital only) E-DDC Enhanced Display Data Channel

(VESA standard for communication

channel and display). Using E-DDC,

the video source can read the EDID

information form the display. EDID Extended Display Identification Data

(VESA standard) EEPROM Electrically Erasable and

Programmable Read Only Memory EMI Electro Magnetic Interference EPLD Erasable Programmable Logic Device EU Europe EXT EXTernal (source), entering the set by

SCART or by cinches (jacks) FDS Full Dual Screen (same as FDW) FDW Full Dual Window (same as FDS) FLASH FLASH memory FM Field Memory or Frequency

Modulation FPGA Field-Programmable Gate Array FTV Flat TeleVision Gb/s Giga bits per second

G-TXT Green TeleteXT H H_sync to the module HD High Definition HDD Hard Disk Drive HDCP High-bandwidth Digital Content

Protection: A “key” encoded into the HDMI/DVI signal that prevents video data piracy. If a source is HDCP coded and connected via HDMI/DVI without the proper HDCP decoding, the picture is put into a “snow vision” mode or changed to a low resolution. For normal content distribution the source and the display device must be enabled for HDCP “software key”

decoding. HDMI High Definition Multimedia Interface HP HeadPhone I Monochrome TV system. Sound

C Inter IC bus

D Inter IC Data bus

S Inter IC Sound bus

carrier distance is 6.0 MHz

IF Intermediate Frequency IR Infra Red IRQ Interrupt Request ITU-656 The ITU Radio communication Sector

(ITU-R) is a standards body

subcommittee of the International

Telecommunication Union relating to

radio communication. ITU-656 (a.k.a.

SDI), is a digitized video format used

for broadcast grade video.

Uncompressed digital component or

digital composite signals can be used.

The SDI signal is self-synchronizing,

uses 8 bit or 10 bit data words, and has

a maximum data rate of 270 Mbit/s,

with a minimum bandwidth of 135

MHz. ITV Institutional TeleVision; TV sets for

hotels, hospitals etc. LS Last Status; The settings last chosen

by the customer and read and stored

in RAM or in the NVM. They are called

at start-up of the set to configure it

according to the customer's

preferences LATAM Latin America LCD Liquid Crystal Display LED Light Emitting Diode L/L' Monochrome TV system. Sound

carrier distance is 6.5 MHz. L' is Band

I, L is all bands except for Band I LPL LG.Philips LCD (supplier) LS Loudspeaker LVDS Low Voltage Differential Signalling Mbps Mega bits per second M/N Monochrome TV system. Sound

carrier distance is 4.5 MHz MIPS Microprocessor without Interlocked

Pipeline-Stages; A RISC-based

microprocessor MOP Matrix Output Processor MOSFET Metal Oxide Silicon Field Effect

Transistor, switching device MPEG Motion Pictures Experts Group MPIF Multi Platform InterFace MUTE MUTE Line NC Not Connected NICAM Near Instantaneous Compounded

Audio Multiplexing. This is a digital

sound system, mainly used in Europe. NTC Negative Temperature Coefficient,

non-linear resistor

2010-Apr-16

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EN 6 SK7.0L CA3.

Precautions, Notes, and Abbreviation List

NTSC National Television Standard

Committee. Color system mainly used in North America and Japan. Color carrier NTSC M/N= 3.579545 MHz, NTSC 4.43= 4.433619 MHz (this is a VCR norm, it is not transmitted off-air)

NVM Non-Volatile Memory: IC containing

TV related data such as alignments O/C Open Circuit OSD On Screen Display OTC On screen display Teletext and

Control; also called Artistic (SAA5800) P50 Project 50: communication protocol

between TV and peripherals PAL Phase Alternating Line. Color system

mainly used in West Europe (color

carrier= 4.433619 MHz) and South

America (color carrier PAL M=

3.575612 MHz and PAL N= 3.582056

MHz) PCB Printed Circuit Board (same as “PWB”) PCM Pulse Code Modulation PDP Plasma Display Panel PFC Power Factor Corrector (or Pre-

conditioner) PIP Picture In Picture PLL Phase Locked Loop. Used for e.g.

FST tuning systems. The customer

can give directly the desired frequency POD Point Of Deployment: a removable

CAM module, implementing the CA

system for a host (e.g. a TV-set) POR Power On Reset, signal to reset the uP PTC Positive Temperature Coefficient,

non-linear resistor PWB Printed Wiring Board (same as “PCB”) PWM Pulse Width Modulation QRC Quasi Resonant Converter QTNR Quality Temporal Noise Reduction QVCP Quality Video Composition Processor RAM Random Access Memory RGB Red, Green, and Blue. The primary

color signals for TV. By mixing levels

of R, G, and B, all colors (Y/C) are

reproduced. RC Remote Control RC5 / RC6 Signal protocol from the remote

control receiver RESET RESET signal ROM Read Only Memory RSDS Reduced Swing Differential Signalling

data interface R-TXT Red TeleteXT SAM Service Alignment Mode S/C Short Circuit SCART Syndicat des Constructeurs

d'Appareils Radiorécepteurs et

SCL Serial Clock I

Téléviseurs

SCL-F CLock Signal on Fast I SD Standard Definition SDA Serial Data I SDA-F DAta Signal on Fast I

C bus

C bus SDI Serial Digital Interface, see “ITU-656” SDRAM Synchronous DRAM SECAM SEequence Couleur Avec Mémoire.

Color system mainly used in France and East Europe. Color carriers=

4.406250 MHz and 4.250000 MHz SIF Sound Intermediate Frequency SMPS Switched Mode Power Supply SoC System on Chip SOG Sync On Green SOPS Self Oscillating Power Supply

SPI Serial Peripheral Interface bus; a 4-

wire synchronous serial data link

standard S/PDIF Sony Philips Digital InterFace SRAM Static RAM SRP Service Reference Protocol SSB Small Signal Board STBY STand-BY SVGA 800 × 600 (4:3) SVHS Super Video Home System SW Software SWAN Spatial temporal Weighted Averaging

Noise reduction SXGA 1280 × 1024 TFT Thin Film Transistor THD Total Harmonic Distortion TMDS Transmission Minimized Differential

Signalling TXT TeleteXT TXT-DW Dual Window with TeleteXT UI User Interface uP Microprocessor UXGA 1 600 × 1 200 (4:3) V V-sync to the module VESA Video Electronics Standards

Association VGA 640 × 480 (4:3) VL Variable Level out: processed audio

output toward external amplifier VSB Vestigial Side Band; modulation

method WYSIWYR What You See Is What You Record:

record selection that follows main

picture and sound WXGA 1280 × 768 (15:9) XTAL Quartz crystal XGA 1024 × 768 (4:3) Y Luminance signal Y/C Luminance (Y) and Chrominance (C)

signal YPbPr Component video. Luminance and

scaled color difference signals (B-Y

and R-Y) YUV Component video

2010-Apr-16

Page 7

4. Mechanical Instructions

Mechanical Instructions

EN 7SK7.0L CA 4.

Index of this chapter:

4.1 Set Disassembly

4.2 Set Re-assembly

Note: Figures below can deviate slightly from the actual situation, due to the different set executions.

4.1 Set Disassembly

Follow the disassemble instructions in described order.

4.1.1 Rear Cover Removal

Warning: disconnect the mains power cord before you remove

the rear cover.

1. Remove all the fixation screws of the rear cover.

2. Now, pull the rear cover backwards and remove it.

4.2 Set Re-assembly

To re-assemble the whole set, do all processes in reverse order. Be sure that, before the rear cover is mounted:

• The mains cord is positioned correctly in its guiding brackets (make sure that the strain reliefs are replaced in its correct position and that it will function correctly!).

• All wires/cables are returned in their original positions.

Figure 4-1 Set Disassembly SL7 styling

2010-Apr-16

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EN 8 SK7.0L CA5.

Service Modes, Error Codes, and Fault Finding

5. Service Modes, Error Codes, and Fault Finding

Index of this chapter:

5.1 Test Points

5.2 Service Modes

5.3 Error Codes

5.4 Fault Finding

5.1 Test Points

See chapter 9 Blockdiagrams.

Perform measurements under the following conditions:

• Service Default Mode.

• Video: color bar signal.

• Audio: 3 kHz left, 1 kHz right.

5.2 Service Modes

This chassis does not contain a specific Service Mode. Service and Alignment of the TV set can be done via the Factory Mode by the service technician, see chapter 6.

5.3 Error Codes

Not applicable.

5.4 Fault Finding

5.4.7 Picture with Horizontal Bright Line and Sound

Check both supply voltages of vertical IC301 and relevant circuitry on correctness and the vertical synchronizing signal.

5.4.8 Remote Control Malfunction

Check the supply voltage of IR receiver. The normal value should be 5.15 V. If this is correct check front control panels soldering connections. If can't be solved, check the remote control, crystal or transmitting diode of the remote control are in good condition.

5.4.9 No Sound

Check power supply of sound IC (IC401) and relevant circuitry. Check as well the BTSC board (if present), check the power supply of IC801 and relevant output signal pins 21 and 27 of this IC. Do not exclude IC801 and/or IC401 to be defective. If needed replace the speakers.

5.4.10 Poor Sound Quality

Check the sound system after searching the channel which should set at NTSC or AUTO. If still has problem, check accompany board circuit on chassis good or not.

5.4.1 Power on Failure

Check whether the power supply is working properly and whether the values of voltages normal. If those are correct, check line transistor and transformer are working properly or check fore or back line for defects.

5.4.2 Horizontal Deflection Transistor Defective: No Picture, No Sound.

To find the fault for a defect horizontal deflection transistor please check the following items:

• Over voltage to breakdown.

• Over current to burn.

• Horizontal frequency too low.

• Horizontal drive inefficient.

5.4.3 Picture Interference

• Check if the signal line contact is good.

• Change Tuner if is necessary.

5.4.4 Cannot find any TV program

Checking method: Check the closed circuit from tuner to picture decoder IC to detect whether there are defective components.

5.4.5 No Good Picture or Double Image

Check the correctness of the signal from IF to Q102 and relevant circuit. In this case the problem can be Q102 and/or SAW201.

5.4.6 Picture not or incorrect Colored

• Check the circuit from IC201 to R.G.B. three gun circuit.

• Check the IC soldering and relevant circuitry on physical

damage or check for defective capacitors.

2010-Apr-16

Page 9

6. Alignments

Alignments

EN 9SK7.0L CA 6.

Index of this chapter:

6.1 General Alignment Conditions

6.2 Software Alignments

6.3 Factory mode Settings

6.1 General Alignment Conditions

6.1.1 Default Alignment Settings

Perform all electrical adjustments under the following conditions:

• Power supply voltage: 230 V

• Connect the set to the mains via an isolation transformer with low internal resistance.

• Allow the set to warm up for approximately 20 to 30 minutes.

• Measure voltages and waveforms in relation to chassis ground (with the exception of the voltages on the primary side of the power supply). Caution: never use heatsinks as ground.

• Test probe: 100: 1, Ri > 10 Mohm, Ci < 3.5 pF.

• Use an isolated trimmer/screwdriver to perform alignments.

/ 50 Hz (± 10%).

6.2 Software Alignments

Put the set in its MENU mode (factory mode) as follows (see also figure “Factory Mode” on the next page):

• Press the keys [i+], “smart sound” and “smart picture” to enter the factory menu.

• Press the keys [i+] again and “ADJUST” appear on screen.

• Press the number keys to enter the adjust page, press B / y to choose the items that to be adjusted, Press z /A to adjust its value.

• Press [i+] to quit factory mode.

The different alignment parameters are described further on.

2. Press key “0” and adjust “HPH” to set picture horizontal centre to CRT horizontal centre.

6.2.5 Vertical & YUV/RGB Horizontal Adjust (Key 0)

1. Provide a 50 Hz cross hatch signal, set TV to standard mode. Adjust VSL so that half picture of the pane cross appears. The picture’s vertical line and kinescope are in superposition.

2. Adjust VSI to obtain picture’s vertical re-display ratio more than 90%.

3. Provide a 60 Hz cross hatch signal, do step 1 and 2 again to adjust.

4. If necessary, fine adjust above items.

6.2.1 Rf AGC Voltage Adjust

1. Provide a 571.25 MHz, 60 dB half color bar signal.

2. Enter factory service mode and press key 3.

3. Measure tuner AGC point voltage, adjust AGC item till the voltage is 2.4 V, or till picture noise just disappears (typical value is at 27).

6.2.2 Focus Fine Adjust

1. Provide a cross-hatch pattern signal.

2. Set state to “Rich” mode.

3. Adjust flyback transformers “Focus” knob till picture is clear.

6.2.3 Screen Voltage Adjust (Key 0)

1. Set picture to “AV Standard” mode, without signal input.

2. Press the keys [i+], “Smart sound” and “Smart picture” to enter the factory menu. Press key “3” to enter page 3. When select “VG2” item, there will be a horizontal line or “in high” “out of high” is displayed on the screen.

3. Adjust flyback transformers “Screen” knob till “OK” is displayed on screen, or untill the horizontal line just can be seen.

6.2.4 Horizontal Adjustment

1. Provide a 50 Hz monoscope pattern. – Press the keys [i+], “Smart sound” and “Smart picture”

to enter the factory menu.

2010-Apr-16

Page 10

EN 10 SK7.0L CA6.

6.3 Factory mode Settings

1ޔHow to enter and exit service mode: Enter "factory service mode" 㧦press "Display", "Sound mode" and "PP" in turn. Enter "design service mode" : aer entering "factory service mode", select "SC"item, then press "8", "9" keys. Exit service mode: press"DISPLAY"key to exit service mode.

2ޔIn service mode, pressing digital keys directly can enter the corresponding page, pressing "MENU"key can enter the next page. Pressing "UP"and"DOWN"keys can select the items to adjust, pressing"LEFT"and"RIGHT"keys can adjust the values. 3ޔBUS OPEN mode: In service mode, pressing"MUTE" key can enter "BUS OPEN" mode, which is useful for white balance adjustment using AUTO WHITE BALANCE EQUIPMENT or mass data wrien into EEPROM IC. Pressing"MUTE" can exit "BUS OPEN" mode. 4ޔFACTORY mode: In service mode, pressing"A/CH"key can enter "FACTORY MODE", which is useful for aging in producon lines. Pressing "8" key and "9" key again can exit "FACTORY MODE"

Alignments

UOC TOP Service Item Description

Table 0 Gemometric Service seng 50Hz/60Hz

Service setting

OSD Display String

Description

Value (Min…Max) /Item list

Horizontal shi HSH Horizontal shi 0..63 32 EW width EWW East West Width 0..63 32

Vercal slope VSL

Vercal slope.This will switch screen to half blank.

0..63 32

Vercal shi VSH Vercal shi 0..63 32 Vercal amplitude VAM Vercal amplitude 0..63 32 S-correcon SC S-correcon 0..63 32

Table 1 Geometric Service seng 1 50Hz/60Hz.

Service setting

OSD Display String

Description

Value (Min…Max) /Item list

EW parabola/width PW East West Parabola Width 0..63 32 EW trapezium TC East West Trapezium 0..63 32 Upper Corner

Parabola

Lower Corner Parabola

Horizontal parallelogram

UCP East West Upper Corner Parabola 0..63 32

LCP East West lower Corner Parabola 0..63 32

HPAR Horizontal parallelogram 0..63 32

Horizontal bow HBOW Horizontal bow 0..63 32

Default

2010-Apr-16

Page 11

Table 2

Service setting

Black level oﬀset C

OSD Display String

BLOC

Description

Black level oﬀset Course

Alignments

EN 11SK7.0L CA 6.

Value (Min…Max) /Item list

0..63 7

Default

Black level oﬀset R

Black level oﬀset G

Black level oﬀset B

BLOR Black level oﬀset Red 0..63 32

BLOG Black level oﬀset Green 0..63 32

BLOB Black level oﬀset Blue 0..63 32

White point R WPR White point Red 0..63 32 White point G WPG White point Green 0..63 32 White point B WPB White point BLUE 0..63 32

Table 3

OSD

Service setting

Display String

AGC Take over AGC

Description

AGC Take over. Also used as TOP when an internal AGC tuner is used.

Value (Min…Max) /Item list

0..63 32

Sub-brightness SUB-BRI Sub brightness 0..63 0 brightness of white

balance

contrast of white balance

WBT

WCT

In TV or YUV,brightness of white balance

In TV or YUV,brightness of white contrast

0..63 32

VG2 VG2 VG2 Adjust 0..63 32 Out of factory BOX Out of factory 0..㧝 0

Default

2010-Apr-16

Page 12

EN 12 SK7.0L CA6.

Alignments

Table 4 Gemometric Service seng 2

Service setting

OSD Display String

Description

Value (Min…Max) /Item list

Speech treble S-TR Speech treble 0..63 24 Speech bass S-BA Speech bass 0..63 42 Music treble M-TR Music treble 0..63 42 Music bass M-BA Music bass 0..63 48 Theatre treble T-TR Theatre treble 0..63 32 Theatre bass T-BA Theatre bass 0..63 48 AV curve oﬀset

compare to TV

AV-OF AV curve oﬀset compare to TV -31..32 0

Volume curve V-05 The volume seng for OSD 5 0..81 5 Volume curve V-10 The volume seng for OSD 10 0..81 15 Volume curve V-20 The volume seng for OSD 20 0..81 25 Volume curve V-30 The volume seng for OSD 30 0..81 35 Volume curve V-40 The volume seng for OSD 40 0..81 55 Volume curve V-50 The volume seng for OSD 50 0..81 65 Volume curve V-63 The volume seng for OSD 63 0..81 81

Default

Table 5

Service setting

OSD Display String

Description

Value (Min…Max) /Item list

So brightness S-BRI So brightness 0..63 32 So colour S-COL So colour 0..63 20 So contrast S-CON So contrast 0..63 20 So sharpness S-SHA So sharpness 0..63 25 Natural brightness N-BRI Natural brightness 0..63 32 Natural colour N-COL Natural colour 0..63 25 Natural contrast N-CON Natural contrast 0..63 21 Natural sharpness N-SHA Natural sharpness 0..63 32 Rich brightness R-BRI Rich brightness 0..63 38 Rich colour R-COL Rich colour 0..63 30 Rich contrast R-CON Rich contrast 0..63 50 Rich sharpness R-SHA Rich sharpness 0..63 20

Default

2010-Apr-16

Page 13

Alignments

EN 13SK7.0L CA 6.

Table 6

Service setting

OSD Display String

Description

Value (Min…Max) /Item list

0:58.75M 1:45.75M

IFA, IFB, IFC IF IF select

2:38.9M 3:38,00M 4:33.40M 5:33.90M

AGC Speed A SPD AGC speed adjust 0..3 1

Blue screen B B Blue screen

Video mute V-M switch source whether blanking

0:No signal is snowﬂake 1:No signal is blue screen

0:No black blanking 1:blanking

0:MUTE low

mute pin type M-MODE mute pin type

DEMUTE high 1:MUTE high DEMUTE low

AV POC SETTING A-POC AV POC SETTING

0:POC=0 1:POC by IFI seng

0:POC by LOCK or SL seng

TV POC SETTING T-POC TV POC SETTING

1:POC by LOCK or IFI seng 2:POC by LOCK or IFI or SL seng

Default

0:AV by IFI seng,TV by IFI

bule scree condion BULE bule scree condion

or SL seng

1:Program seng

0:Program seng

switch oﬀ condion OFF switch oﬀ condion

1:AV by IFI seng,TV by IFI

and SL seng

VG2-MODE VG2-MODE

0:Light line adjust mode 1:Character adjust mode

0..1 0

VSD-Bri VSD-Bri VG2 brightness adjust 0..63 32 CC-DELAY DELAY CCD delay 0..127 2

2010-Apr-16

Page 14

EN 14 SK7.0L CA6.

Alignments

Table 7

Service setting

OSD Display String

Description

Value (Min…Max) /Item list

BTSC-MODE MODE BTSC mode select 0..2 0

SAP SEND LO OR HI SAP-LH SAP SEND LO OR HI

STEREO SENS LO OR HI

STEREO-LH STEREO SENS LO OR HI

SAP Level 1 or 2 SAP1-2 SAP Level 1 or 2

SIF or BASE BAND mode

SIF-BASE SIF or BASE BAND mode

0:SAP low 1:SAP high

0:STEREO low 1:STEREO high

0:SAP level 1 1:SAP level 2

0:SIF mode 1:BASE BAND mode

BTSC-DETECT DETECT BTSC detect me for switch source 50

Table 8

OSD

Service setting

Display

Description

String

Bass and treble BAS-TRE

Bass and treble present in sound menu

DSK register DSK Dynamic skin control on/oﬀ

Value (Min…Max) /Item list

0:Oﬀ 1:On

Disco Gain DISG register DISG 0x4a bit 6 0/1 0 Coring of SVM

output sigle

Cap bank switch for DCXO

COF Register COFF 0x48 bit 7 0/1 0

DCXO NTSC DCXO_CAP seng 0..3 2

PAL-M Cap bank switch

PM-DCXO PAL-M DCXO_CAP seng 0..3 2

for DCXO

PAL-N Cap bank switch

PN-DCXO PAL-N DCXO_CAP seng 0..3 2

for DCXO

0:AKB seng 0,have CCC

AKB AKB AKB register seng

funcon 1:AKB seng 1

OSD Positon O-V50 OSD vercal positon for 50HZ 0..63 35 OSD Positon O-V60 OSD vercal positon for 60HZ 0..63 35 OSD Positon O-HOR OSD Horizontal positon 10..50 36

0..2

PCB Logic LOGIC PCB Logic

0:3P67SN 1:5P67SN 2:3P69SN

Init NVM INIT Init NVM 0/1 0

Default

2010-Apr-16

Page 15

Table 9

Alignments

EN 15SK7.0L CA 6.

OSD

Service setting

Display

Description

String

AV1 AV1 AV1 present for AV status

SIDE SIDE SIDE present for AV status

AV2 AV2 AV2 present for AV status

S-VIDEO S-V S-VIDEO present for AV status

YUV YUV YUV present for AV status

Le sound output MONO TV MONO select

Value (Min…Max) /Item list

0:Oﬀ 1:On

0:stereo 1:mono

0:power on

Standby remember R-POWER Standby remember

1:power oﬀ

2:power remember

Vercal linearity 5VLIN Vercal linearity for 50 Hz 0..63 32 Vercal linearity 6VLIN Vercal linearity for 60 Hz 0..63 32 VCS 5VSCR Vercal scroll for 50 Hz 0..63 32 VCS 6VSCR Vercal scroll for 60 Hz 0..63 32 VX or VA seng

when 16:9 nide

ZOOM 16

4:3 ZOOM N

Expand 4:3 ZOOM EX

VX-VAM=0,Seng VX register VX-VAM=1,Seng VA register

0..63 0

0..63 25

0..63 51

Default

Table 10

Service setting

OSD Display String

Description

Value (Min…Max) /Item list

Max-brightness MAX-BRI Max-brightness 0..63 63 Sub-contrast SUB-CON Sub-contrast 0..63 0 Max-contrast MAX-CON Max-contrast 0..63 63 Max-colour MAX-COL Max-colour 0..63 63 No signal EWW N-EWW No signal EWW -32..+31 0

0..1

Black stretch depth DEP Black stretch depth

0:15 IRE

1:30 IRE

0:normal

Color temp of so S-C Color temp of so

1:cold

2:warm

2010-Apr-16

Default

Page 16

EN 16 SK7.0L CA6.

Alignments

0:normal

Color temp of nature N-C Color temp of nature

1:cold 2:warm

0:normal

Color temp of rich R-C Color temp of rich

1:cold 2:warm

4:3 expand switch 4:3 4:3 expand present state

16:9 switch 16:9 16:9 present state

VX VX-VAM

VX or VAM acve for VX 16:9 VX NORMAL and VX EXPAND

0:Oﬀ 1:On

0:VX 1:VAM

Table 11

Service setting

OSD Display String

Description

Value (Min…Max) /Item list

Peak white PWL Peak white liming 0..63 15 Cathode HDOL Cathode 0..15 12 Oﬀset IF

demodulator

OIF

Blue stretch BLUE-S Blue stretch

Correcon for DC oﬀset in the IF-PLL

0..63 32

0:Oﬀ 1:On

0:FBC=0,FBC1=0

FBC-FBC1 register FBC-FBC1

1:FBC=1,FBC1=0 2:FBC=0,FBC1=1

0..3 0

3:FBC=1,FBC1=1

YD0-YD3 register P-YD In PAL,Lighteness delay 0..15 9 YD0-YD3 register N-YD In NTSC,Lighteness delay 0..15 8 YD0-YD3 register A-YD In AV,Lighteness delay 0..15 10

DMPH register DMPH DMPH register

0:Oﬀ 1:On

CBAF0-CBAF1 register CBAF0-1 Frequency select of BASS 0..3 0 CTRF0-CTRF1register CTRF0-1 Frequency select of TREBLE 0..3 0

CB REGISTER CB CB register

0: Fsc 1: 1.1*Fsc

Default

2010-Apr-16

0:MAT=0,MUS=0,MTXF=0 1:MAT=1,MUS=0,MTXF=0

2:MAT=0,MUS=1,MTXF=0 MAT,MUS,MTXFregist er

MATRIX

3:MAT=1,MUS=1,MTXF=0

4:MAT=0,MUS=0,MTXF=1

0..7 0

5:MAT=1,MUS=0,MTXF=1

6:MAT=0,MUS=1,MTXF=1

7:MAT=1,MUS=1,MTXF=1

FMWB register FMWB FMWB register 3 HCO register HCO 0:HCO=0,1:HCO=1 0..1 0

Page 17

Alignments

EN 17SK7.0L CA 6.

Table 12

OSD

Service setting

Display String

AGN AGN

Description

Gain for FM demodulator AGN=0:normal AGN=1:+6db,

Value (Min…Max) /Item list

0:PAL AGN=0,NTSC AGN=0 1:PAL AGN=0,NTSC AGN=1 2:PAL AGN=1,NTSC AGN=0 3:PAL AGN=1,NTSC AGN=1

0:normal

AGNE1;AGNE0 AGNE

Extra gain seng for FM demodulaor

1:+3.8db 2:-6db

3:-3db

0:100k

FMWS1;FMWS0 FMWS

Window selecon for FM demodulator

1:225k 2:450k

3:900k

BPB2 BPB2

bypass sound bandpass ﬁlter secon 2

FFI FFI Fast ﬁlter IF-PLL

0:acved 1:bypassed

0:Normal 1:increased

0:oﬀ

COR1 COR2 OF AV A-COR COR1 COR2 register seng

1:0-20 2:0-40

3:0-100

0:oﬀ

COR1 COR2 OF TV T-COR COR1 COR2 register seng

1:0-20 2:0-40

3:0-100

0:In AV,FOA=1,FOB=1.In

FOA FOB SETTING FOA-FOB FOA and FOB seng

TV,FOA=0,FOB=0. 1:FOA=0,FOB=1.

2:FOA=1,FOB=0

DSG TV-DSG In TV,DSG register 0..1 1 DSG AV-DSG In AV,DSG register 0..1 1 menu le posion MENU-H menu posion adjust 36 DGLS REGISTER

SETTING

DSGLS DSGL Sregister

0:+0db 1:+6db

Default

2010-Apr-16

Page 18

EN 18 SK7.0L CA6.

Alignments

Table 13

OSD

Service setting

Display

Description

String

Slicing level SSL

Slicing level FSL

AAS1;AAS0 AAS

Slicing level horizontal sync

seperator

Force slicing level for vercal

sync

Black area to switch of the black

strenth

SOC0;SOC1 SOC So clipping level

HBL HBL RGB blank mode

WBF WBF Timing of wide blanking

WBR WBR Timing of wide blanking

brightness of black balance

contrast of black balance

CT In TV or YUV,Contrast of black balance 0..63 32

In TV or YUV,Brightness of black

balance

Value (Min…Max) /Item list

0:50% 1:30%

0:dependent on noise detector 1:ﬁxed

0 slicing level of 60%

0:10% 1:12% 2:6%

3:8%

0:0% 1:5% 2:10%

3:oﬀ

0:normal 1:wide

0:3.5us 1:5.9us

0:7.8us 1:10.2us

0..63 32

Default

2010-Apr-16

Table 14

Service setting

OSD Display String

Description

Value (Min…Max) /Item list

NVM version C0 Char0 48..255 NVM version C1 Char1 48..255 NVM version C2 Char2 48..255 NVM version Y Year 8..10 8 NVM version M Month 0..12 7 NVM version D Day 0..31 8

X-ray protect

XDT XDT

0:Hardware protect.1:Soware

0/1 0

protect

XDT SW ACTIVE XDT-OFFON XDT protect avail

0:Oﬀ 1:On

SW detect mes XDT-TIME XDT protect detect mes 0..255 10

Default

Page 19

Alignments

EN 19SK7.0L CA 6.

STB SETTING STB In power oﬀ,STB register seng

EVG register EVG Field protect funcon

0:STB=0 1:STB=1

0:Oﬀ 1:On

0:color sensivity -34dB

CHSE1 CHSE0 register CHSE

If CHSE ON seng on,CHSE value of strong signal

1:color sensivity -37dB 2:color sensivity -41dB 3:color sensivity -46dB

Auto low signal idenfy

CHSE ON Auto low signal idenfy

OSD err protect PRO OSD err protect

1:On low signal is -46dB 0:Oﬀ

0:Oﬀ 1:On

OSD err mes PRO1 OSD err mes 0

Table 15

Service setting

Black level oﬀset R of YUV NORMAL

Black level oﬀset G of YUV NORMAL

Black level oﬀset B of YUV NORMAL

White point R of YUV NORMAL

White point G of YUV NORMAL

White point B of YUV NORMAL

Black level oﬀset R of YUV NORMAL

OSD Display

Description

String

Y-BR

Y-BG

Y-BB

Black level oﬀset R of YUV NORMAL

Black level oﬀset G of YUV NORMAL

Black level oﬀset B of YUV NORMAL

Y-WR White point R of YUV NORMAL -32..+31 0

Y-WG White point G of YUV NORMAL -32..+31 0

Y-WB White point B of YUV NORMAL -32..+31 0

Y-C-BR

Black level oﬀset R of YUV NORMAL

Value (Min…Max) /Item list

-32..+31

-32..+31 0

Default

Black level oﬀset G of YUV COOL

Black level oﬀset B of YUV COOL

White point R of YUV COOL

White point G of YUV COOL

White point B of YUV COOL

Y-C-BG

Y-C-BB

Black level oﬀset G of YUV COOL

Black level oﬀset B of YUV COOL

-32..+31 0

Y-C-WR White point R of YUV COOL -32..+31 0

Y-C-WG White point G of YUV COOL -32..+31 0

Y-C-WB White point B of YUV COOL -32..+31 0

2010-Apr-16

Page 20

EN 20 SK7.0L CA6.

Alignments

Black level oﬀset R of YUV WARM

Black level oﬀset G of YUV WARM

Black level oﬀset B of YUV WARM

Table 16

Service setting

White point R of YUV WARM

White point G of YUV WARM

White point B of YUV WARM

Black level oﬀset R of TV COOL

Black level oﬀset G of TV COOL

Black level oﬀset B of TV COOL

White point R of TV COOL

White point G of TV COOL

White point B of TV COOL

Black level oﬀset R of TV WARM

Black level oﬀset G of TV WARM

Black level oﬀset B of TV WARM

White point R of TV WARM

White point G of TV WARM

White point B of TV WARM

Y-W-BR

Y-W-BG

Y-W-BB

OSD Display String

Black level oﬀset R of YUV WARM

Black level oﬀset G of YUV WARM

Black level oﬀset B of YUV WARM

Description

-32..+31 0

Value (Min…Max) /Item list

Y-W-WR White point R of YUV WARM -32..+31

Y-W-WG White point G of YUV WARM -32..+31

Y-W-WB White point B of YUV WARM -32..+31

T-C-BR

T-C-BG

T-C-BB

Black level oﬀset R of TV COOL

Black level oﬀset G of TV COOL

Black level oﬀset B of TV COOL

-32..+31

T-C-WR White point R of TV COOL -32..+31

T-C-WG White point G of TV COOL -32..+31

T-C-WB White point B of TV COOL -32..+31

T-W-BR

T-W-BG

T-W-BB

Black level oﬀset R of TV WARM

Black level oﬀset G of TV WARM

Black level oﬀset B of TV WARM

-32..+31

T-W-WR White point R of TV WARM -32..+31

T-W-WG White point G of TV WARM -32..+31

T-W-WB White point B of TV WARM -32..+31

Default

2010-Apr-16

Page 21

7. Circuit Descriptions

Circuit Descriptions

EN 21SK7.0L CA 7.

Index of this chapter:

7.1 Introduction

7.2 The various circuits

7.1 Introduction

The SK7.0L CA is a CRT TV based on the 3P67SN platform. In this chapter, only a general description of the various circuits is given. For more detailed information, see the circuit diagrams in this manual.

7.2 The various circuits

7.2.1 Tuner

The function of the tuner is to select the channel to be received and suppress the interference of neighboring channels, to amplify the high frequency signal, to improve the receiving sensitivity and SNR, and to generate a PIF signal through frequency conversion.

7.2.2 IF Channel

The IF Channel mainly ensures the sensitivity and selectivity of the complete TV set. The IF AMP integrated in the UOCIII is made up of a three-stage dual-differential amplifier with a gain value above 70 dB, a SNR of 55 dB and a bandwidth of 7 MHz. The video demodulation circuit is made from the built-in PLL Sync Detector. The spectrum of the demodulation carrier is unitary and it is not affected by the content of the video signal. The tuner features stable receptivity while the signal output from the video detector features high fidelity. The built-in PLL circuit of the UOCIII generates a 38.0 MHz or 38.9 MHz demodulation reference signal for the sync detector to demodulate the video signal; this is called “PLL sync demodulation”.

7.2.3 Sound Channel

An external ceramic filter is used to select the second SIF signal for the sound channel of UOCIII from the signal output of the video detector. The audio signal is obtained after limiting amplification and demodulation by the intermediate frequency detector for the SIF signal, and then the audio signal is fed to the BTSC stereo/SAP decoder TDA9850. From that it is output to the audio amplifier TFA9842, which drives the speakers to provide the sound. The intermediate frequency detector and volume-control attenuator that are built in the UOCIII are set and adjusted via the CPU.

7.2.6 BTSC stereo/SAP decoder

Input Level Adjustment

The composite input signal is fed to the input level adjustment stage. The control range is from -3.5 to +4.0 dB in steps of

0.5 dB. The maximum input signal voltage is 2 V (RMS).

Stereo Decoder

The output signal of the level adjustment stage is coupled to a low-pass filter which suppresses the baseband noise above 125 kHz. The composite signal is then fed into a pilot detector/ pilot cancellation circuit and into the MPX demodulator. The main L + R signal passes a 75 ms fixed de-emphasis filter and is fed into the dematrix circuit. The decoded sub-signal L - R is sent to the stereo/SAP switch. To generate the pilot signal the stereo demodulator uses a PLL circuit including a ceramic resonator. The stereo channel separation is adjusted by an automatic procedure to be performed during set production. The stereo identification can be read by the I different pilot thresholds (data STS = 1; STS = 0) can be selected via the I

SAP Demodulator

The composite signal is fed from the output of the input level adjustment stage to the SAP demodulator circuit through a 5fH band-pass filter. The demodulator level is automatically controlled. The SAP demodulator includes an internal field strength detector that mutes the SAP output in the event of insufficient signal conditions. The SAP identification signal can be read by the I

Noise Detector

The composite input noise increases with decreasing antenna signal. This makes it necessary to switch stereo or SAP off at certain thresholds. These thresholds can be set via the I bus. With ST0 to ST3 the stereo threshold can be selected and with SP0 to SP3 the SAP threshold. A hysteresis can be achieved via software by making the threshold dependent of the identification bits STP and SAPP.

Mode Selection

The stereo/SAP switch feeds either the L - R signal or the SAP demodulator output signal via the internal dbx noise reduction circuit to the dematrix/switching circuit. Different switch modes provided at the output pins OUTR and OUTL are available.

dbx Decoder

The dbx circuit includes all blocks required for the noise reduction system in accordance with the BTSC system specification. The output signal is fed through a 73 ms fixed deemphasis circuit to the dematrix block.

C-bus.

C-bus. Two

C-

7.2.4 CRT Drive Circuit

In the driver circuit, both the voltage and current of the R/G/B signal are amplified, after which the CRT drive circuit modulates the cathode beam current of the CRT. The R/G/B signal input into the driver circuit is of negative polarity.

7.2.5 Power Supply Circuit

The function of the power supply circuit is to supply various stabilized operating voltages and to provide protections against excessive voltages and currents.

SAP Output

Independent of the stereo/SAP switch, the SAP signal is also available at pin SAP. At SAP, the SAP signal is not dbx decoded. The capacitor at SDE provides a recommended deemphasis (150 ms) at SAP.

Integrated Filters

The filter functions necessary for stereo and SAP demodulation and part of the dbx filter circuits are provided on-chip using transconductor circuits. The required filter accuracy is attained by an automatic filter alignment circuit.

2010-Apr-16

Page 22

EN 22 SK7.0L CA8.

8. IC Data Sheets

This section shows the internal block diagrams and pin layouts of ICs that are drawn as “black boxes” in the electrical diagrams.

8.1 PSU, W6553A, (IC601)

IC Data Sheets

2010-Apr-16

Figure 8-1 Block Diagram and Pin Configuration

H_17210_039.eps

120607

Page 23

8.2 PSU, IP421, (IC602)

8.3 Input switching, 4052, (IC451)

IC Data Sheets

H_17210_039.eps

120607

Figure 8-2 Block Diagram and Pin Configuration

EN 23SK7.0L CA 8.

Block Diagram

Pin Configuration

Figure 8-3 Block Diagram and Pin Configuration

H_17210_041.eps

120607

2010-Apr-16

Page 24

EN 24 SK7.0L CA8.

8.4 Control, 24C08 (IC101)

IC Data Sheets

Pin Configuration

Figure 8-4 Block Diagram

H_17210_035.eps

120607

2010-Apr-16

Figure 8-5 Pin Configuration

H_17210_036.eps

120607

Page 25

8.5 Control, TDA12165x (IC201)

Pinning

IC Data Sheets

EN 25SK7.0L CA 8.

Figure 8-6 Block Diagram

2010-Apr-16

Page 26

EN 26 SK7.0L CA8.

IC Data Sheets

Pin Configuration

2010-Apr-16

Figure 8-9 Pin Configuration

Figure 8-7 Pin Configuration

Page 27

9. Block Diagrams

PWB locations

Block Diagrams

EN 27SK7.0L CA 9.

&57 3$1(/

0$,1

&+$66,6

3$1(/

32:(5 6833/<

/,1( '()/(&7,21

)5$0( '()/(&7,21

781(5 ,)

$9 ,2

2010-Apr-16

$8',2  9,'(2

9,'(2 ,) 6281' ,)

&38 &21752/

$8',2 $03/,),(5

Page 28

Block Diagram Chassis

Block Diagrams

EN 28SK7.0L CA 9.

2010-Apr-16

Page 29

Circuit Diagrams and PWB Layouts

10. Circuit Diagrams and PWB Layouts

21SL7 Schematic Overview Chassis

EN 29SK7.0L CA 10.

2010-Apr-16

Page 30

Circuit Diagrams and PWB Layouts

21SL7 Layout Mono Carrier (Top Side)

EN 30SK7.0L CA 10.

2010-Apr-16

Page 31

Circuit Diagrams and PWB Layouts

21SL7 Layout Mono Carrier (Bottom Side)

EN 31SK7.0L CA 10.

2010-Apr-16

Page 32

Circuit Diagrams and PWB Layouts

CRT panel

NOT AVAILABLE AT TIME OF PUBLISHING

EN 32SK7.0L CA 10.

2010-Apr-16

10000_043_090121.eps

090121