Toshiba 21S04 Schematic

SERVICE MANUAL

FILE NO. 050-200003

21S04B, 21S04D

21S04F, 21S04I

21S04N

PRINTED IN U. K

COLOUR TELEVISION

1. Precautions

1-1 Safety Precautions

1. Be sure that all of the built-in protective devices are replaced. Restore any missing protective shields.

2. When reinstalling the chassis and its assemblies, be sure to restore all protective devices, including: nonmetallic control knobs and compartment covers.

3. Make sure that there are no cabinet openings through which people—particularly children—might insert fingers and contact dangerous voltages. Such openings include the spacing between the picture tube and the cabinet mask, excessively wide cabinet ventilation slots, and improperly fitted back covers.

If the measured resistance is less than 1.0 megohm or greater than 5.2 megohms, an abnormality exists that must be corrected before the unit is returned to the customer.

4. Leakage Current Hot Check (Figure 1-1): Warning: Do not use an isolation transformer during this test. Use a leakagecurrent tester or a metering system that complies with American National Standards Institute (ANIS C101.1, Leakage Current for Appliances), and Underwriters Laboratories (UL Publication UL1410, 59.7).

5. With the unit completely reassembled, plug the AC line cord directly into the power outlet. With the unit’s AC switch first in the ON position and then OFF, measure the current between a known earth ground (metal water pipe, conduit, etc.) and all exposed metal parts, including: antennas, handle brackets, metal cabinets, screwheads and control shafts. The current measured should not exceed 0.5 milliamp. Reverse the powerplug prongs in the AC outlet and repeat the test.

Fig. 1-1 AC Leakage Test

6. Antenna Cold Check: With the unit’s AC plug disconnected from the AC source, connect an electrical jumper across the two AC prongs. Connect one lead of the ohmmeter to an AC prong. Connect the other lead to the coaxial connector.

7. X-ray Limits: The picture tube is especially designed to prohibit X-ray emissions. To ensure continued X-ray protection, replace the picture tube only with one that is the same type as the original. Carefully reinstall the picture tube shields and mounting hardware; these also provide X-ray protection.

8. High Voltage Limits: High voltage must be measured each time servicing is done on the B+, horizontal deflection or high voltage circuits. Correct operation of the X-ray protection circuits must be reconfirmed whenever they are serviced.

(X-ray protection circuits also may be called

“horizontal disable” or “hold-down”.)

Heed the high voltage limits. These include the X–ray Protection Specifications Label, and the Product Safety and X-ray Warning Note on the service data schematic.

Precautions

1-1

LEAKAGE CURRENT

TESTER

DEVICE UNDER

TEST

TEST ALL

EXPOSED METAL

SURFACES

2-WIRE CORD

ALSO TEST WITH

PLUG REVERSED (USING AC ADAPTER PLUG AS REQUIRED)

EARTH

GROUND

(READING SHOULD

NOT BE ABOVE

0.5mA)

Follow these safety, servicing and ESD precautions to prevent damage and protect against potential hazards such as electrical shock and X-rays.

1-1 Safety Precautions (Continued)

9. High voltage is maintained within specified

limits by close-tolerance, safety-related components and adjustments. If the high voltage exceeds the specified limits, check each of the special components.

10. Design Alteration Warning:

Never alter or add to the mechanical or electrical design of this unit. Example: Do not add auxiliary audio or video connectors. Such alterations might create a safety hazard. Also, any design changes or additions will void the manufacturer’s warranty.

11. Hot Chassis Warning:

Some TV receiver chassis are electrically connected directly to one conductor of the AC power cord. If an isolation transformer is not used, these units may be safely serviced only if the AC power plug is inserted so that the chassis is connected to the ground side of the AC source.

To confirm that the AC power plug is inserted correctly, do the following: Using an AC voltmeter, measure the voltage between the chassis and a known earth ground. If the reading is greater than 1.0V, remove the AC power plug, reverse its polarity and reinsert. Re-measure the voltage between the chassis and ground.

12. Some TV chassis are designed to operate with

85 volts AC between chassis and ground, regardless of the AC plug polarity. These units can be safely serviced only if an isolation transformer inserted between the receiver and the power source.

13. Some TV chassis have a secondary ground

system in addition to the main chassis ground. This secondary ground system is not isolated from the AC power line. The two ground systems are electrically separated by insulating material that must not be defeated or altered.

14. Components, parts and wiring that appear to

have overheated or that are otherwise damaged should be replaced with parts that meet the original specifications. Always determine the cause of damage or overheating, and correct any potential hazards.

15. Observe the original lead dress, especially near the following areas: Antenna wiring, sharp edges, and especially the AC and high voltage power supplies. Always inspect for pinched, out-of-place, or frayed wiring. Do not change the spacing between components and the printed circuit board. Check the AC power cord for damage. Make sure that leads and components do not touch thermally hot parts.

16. Picture Tube Implosion Warning: The picture tube in this receiver employs “integral implosion” protection. To ensure continued implosion protection, make sure that the replacement picture tube is the same as the original.

17. Do not remove, install or handle the picture tube without first putting on shatterproof goggles equipped with side shields. Never handle the picture tube by its neck. Some “in-line” picture tubes are equipped with a permanently attached deflection yoke; do not try to remove such “permanently attached” yokes from the picture tube.

18. Product Safety Notice: Some electrical and mechanical parts have special safety-related characteristics which might not be obvious from visual inspection. These safety features and the protection they give might be lost if the replacement component differs from the original—even if the replacement is rated for higher voltage, wattage, etc.

Components that are critical for safety are indicated in the circuit diagram by shading, ( ) or ( ). Use replacement components that have the same ratings, especially for flame resistance and dielectric strength specifications. A replacement part that does not have the same safety characteristics as the original might create shock, fire or other hazards.

Precautions

1-2

1-2 Servicing Precautions

1. Servicing precautions are printed on the cabinet. Follow them.

2. Always unplug the unit’s AC power cord from the AC power source before attempting to: (a) Remove or reinstall any component or assembly, (b) Disconnect an electrical plug or connector, (c) Connect a test component in parallel with an electrolytic capacitor.

3. Some components are raised above the printed circuit board for safety. An insulation tube or tape is sometimes used. The internal wiring is sometimes clamped to prevent contact with thermally hot components. Reinstall all such elements to their original position.

4. After servicing, always check that the screws, components and wiring have been correctly reinstalled. Make sure that the portion around the serviced part has not been damaged.

5. Check the insulation between the blades of the AC plug and accessible conductive parts (examples: metal panels, input terminals and earphone jacks).

6. Insulation Checking Procedure: Disconnect the power cord from the AC source and turn the power switch ON. Connect an insulation resistance meter (500V) to the blades of the AC plug.

The insulation resistance between each blade of the AC plug and accessible conductive parts (see above) should be greater than 1 megohm.

7. Never defeat any of the B+ voltage interlocks. Do not apply AC power to the unit (or any of its assemblies) unless all solid-state heat sinks are correctly installed.

8. Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the positive lead; always remove the instrument’s ground lead last.

Precautions

1-3

Warning1: First read the “Safety Precautions” section of this manual. If some unforeseen circumstance creates a conflict between

the servicing and safety precautions, always follow the safety precautions.

Warning2: An electrolytic capacitor installed with the wrong polarity might explode.

1. Some semiconductor (“solid state”) devices are easily damaged by static electricity. Such components are called Electrostatically Sensitive Devices (ESDs); examples include integrated circuits and some field-effect transistors. The following techniques will reduce the occurrence of component damage caused by static electricity.

2. Immediately before handling any semicon ductor components or assemblies, drain the electrostatic charge from your body by touching a known earth ground. Alternatively, wear a discharging wrist-strap device. (Be sure to remove it prior to applying power— this is an electric shock precaution.)

3. After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum foil to prevent accumulation of electrostatic charge.

4. Do not use freon-propelled chemicals. These can generate electrical charges that damage ESDs.

5. Use only a grounded-tip soldering iron when soldering or unsoldering ESDs.

6. Use only an anti-static solder removal device. Many solder removal devices are not rated as “anti-static”; these can accumulate sufficient electrical charge to damage ESDs.

7. Do not remove a replacement ESD from its protective package until you are ready to install it. Most replacement ESDs are packaged with leads that are electrically shorted together by conductive foam, aluminum foil or other conductive materials.

8. Immediately before removing the protective material from the leads of a replacement ESD, touch the protective material to the chassis or circuit assembly into which the device will be installed.

9. Minimize body motions when handling unpackaged replacement ESDs. Motions such as brushing clothes together, or lifting a foot from a carpeted floor can generate enough static electricity to damage an ESD.

Precautions

1-4

1-3 Precautions for Electrostatically Sensitive Devices (ESDs)

Reference Information

2-1

2. Reference Information

2-1 Tables of Abbreviations and Acronyms

A Ah Å dB dBm

°C °F °K F G GHz g H Hz h ips kWh kg kHz kΩ km km/h kV kVA kW I MHz

Ampere Ampere-hour Angstrom Decibel Decibel Referenced to One Milliwatt Degree Celsius Degree Fahrenheit degree Kelvin Farad Gauss Gigahertz Gram Henry Hertz Hour Inches Per Second Kilowatt-hour Kilogram Kilohertz Kilohm Kilometer Kilometer Per Hour Kilovolt Kilovolt-ampere Kilowatt Liter Megahertz

MV MW MΩ m µA µF µH µm µs µW mA mg mH mI mm ms mV nF

Ω

pF Ib rpm rps s V VA W Wh

Megavolt Megawatt Megohm Meter Microampere Microfarad Microhenry Micrometer Microsecond Microwatt Milliampere Milligram Millihenry Milliliter Millimeter Millisecond Millivolt Nanofarad Ohm Picofarad Pound Revolutions Per Minute Revolutions Per Second Second (Time) Volt Volt-ampere Watt Watt-hour

Table 2-1 Abbreviations

Reference Information

2-2

Table 2-2 Table of Acronyms

ABL AC ACC AF AFC AFT AGC AM ANSI APC APC A/V AVC BAL BPF B-Y CATV CB CCD CCTV Ch CRT CW DC DVM EIA ESD ESD FBP FBT FF FM FS GND G-Y H HF HI-FI IC IC IF

Automatic Brightness Limiter Alternating Current Automatic Chroma Control Audio Frequency Automatic Frequency Control Automatic Fine Tuning Automatic Gain Control Amplitude Modulation American National Standards Institute Automatic Phase Control Automatic Picture Control Audio-Video Automatic Volume Control Balance Bandpass Filter Blue-Y Community Antenna Television (Cable TV) Citizens Band Charge Coupled Device Closed Circuit Television Channel Cathode Ray Tube Continuous Wave Direct Current Digital Volt Meter Electronics Industries Association Electrostatic Discharge Electrostatically Sensitive Device Feedback Pulse Flyback Transformer Flip-Flop Frequency Modulation Fail Safe Ground Green-Y High High-Frequency High Fidelity Inductance-Capacitance Integrated Circuit Intermediate Frequency

I/O L L LED LF MOSFET MTS NAB NEC NTSC OSD PCB PLL PWM QIF R RC RF R-Y SAP SAW SIF SMPS S/N SW TP TTL TV UHF UL UV VCD VCO VCXO VHF VIF VR VTR VTVM TR

Input/output Left Low Light Emitting Diode Low Frequency Metal-Oxide-Semiconductor-Field-Effect-Tr Multi-channel Television Sound National Association of Broadcasters National Electric Code National Television Systems Committee On Screen Display Printed Circuit Board Phase-Locked Loop Pulse Width Modulation Quadrature Intermediate Frequency Right Resistor & Capacitor Radio Frequency Red-Y Second Audio Program Surface Acoustic Wave(Filter) Sound Intermediate Frequency Switching Mode Power Supply Signal/Noise Switch Test Point Transistor Transistor Logic Television Ultra High Frequency Underwriters Laboratories Ultraviolet Variable-Capacitance Diode Voltage Controlled Oscillator Voltage Controlled Crystal Oscillator Very High Frequency Video Intermediate Frequency Variable Resistor Video Tape Recorder Vacuum Tube Voltmeter Transistor

Table 2 - 3 IC Line - Up

DESCRIPTION

Video Processor Multistandard Sound Processor MICOM, TTX(MTP)

EEPROM Audio AMP

RGB Drive AMP Hybrid IC

100Hz Horizontal Pulse AMP Vertical IC

Horizontal Drive IC

E/W Drive IC

SPS Controllor Bridge Diode

Photo Coupler 5V Controlled Regulator

Rectifier Diode

3.3V Regulator 6V Regulator 8V Controlled Regulator

3.3V Regulator MICOM Reset IC

IIC Level Shifter

Main Tuner with IF Block Sub Tuner with IF Block

Reference Information

2-3

2-2 IC Line Up

LOC. NO

IC201S

IC601 IC901 IC902

IC602

HIC201 HIC202 HIC203

HIC204 HIC401

IC301

Q402 Q401

D414

IC401

Q404

IC801S

D801S

PC801S

IC802

D805 D806

D807

D802 IC201 IC804

IC803 IC903

IC904

Q909

Q910

TU01S TU02S

BOARD

MAIN

SPEC

VDP3112B

MSP3411G

SDA555X

KS24L161

TDA7297

DRGB001

DDRI001

LA7845

KSC2073-H2

KSD5703

FMP-3FU

KA393 IRF620

3S1265R

RBV606 PC123Y

KA78R05

FML-G12S

FMG-G2CS KA78RM33

KA7806

KA78R08

KA78RM33 KIA7025AP

2N7000

TCLS3101PD09A9(S)

TCPN3081PD09A(S)

REMARK

Refer to Table 2-3-1 Refer to Table 2-3-2

Refer to Table 2-3-3

VM Option

Option

HC401

HC801

VDPY

Refer to Table 2-3-4 Refer to Table 2-3-5

2-4

Table 2 - 3 IC Line - Up

DESCRIPTION

Trans Switching Trans FBT

Video Output AMP R.G.B Drive

Push-Pull (VM)

TR-Power (TILT)

OP-AMP (TILT) OP-AMP TR-Power

Video Switching IC with Adder Output High-end Picture-In Picture IC

3.3V Regulator

LOC. NO

T801S T444S

IC501 IC502 IC503

QF04

QF05 QG02

QG03

ICG01 ICH01

QH01

ICS01

ICP01 ICP02

SPEC

AA26-00046A

FUJ-29B001

TDA6111Q

2SC2344 2SA1011

KSA940

KSD2073-H2

KA4558 KA4558

2SC4636RB

TEA6425

SDA9489X

EZ1086CM

REMARK

Refer to Table 2-3-6 Refer to Table 2-3-7

Option

Option Option

Option

BOARD

MAIN

CRT

DOUBLE

FOCUS V-S/W

PIP

Reference Information

2-5

SPEC

VDP3108B VDP3112B VDP3120B VDP3130Y VDP3140D

FUNCTION

50Hz Basic 50Hz, 2H Comb Filtr 50Hz, 2H Comb Filter, Horizontal Scaler 50Hz, 2H Comb Filter, DVD Input 100Hz

REMARK

Table 2-3-1 VIDEO IC (IC201S)

SPEC

MSP3400D MSP3410D MSP3411G

FUNCTION

Multistandard, A2 Stereo Multistandard, A2 Stereo, Nicam Multistandard, A2 Stereo, Nicam, Vitual Dolby

REMARK

SPEC

TDA7297

FUNCTION

15W x 2CH, 10W x 2CH

REMARK

SPEC

TCLS3101PD09A(S) TCPS3001PD09D(S) TCPS3001PD09E(S)

FUNCTION

CS with LNA Function CS CS

REMARK

Main

India

SPEC

TCPS3000PC09B(S)

FUNCTION

REMARK

Sub

TCPS3001PD09A(S) is out-of-date, TCPS3001PD09D(S) which is up-to-date has the same function.

Table 2-3-2 SOUND IC (IC601)

Table 2-3-3 SOUND AMP (IC602)

Table 2-3-4 1’st TUNER (TU01S)

Table 2-3-5 2’nd TUNER (TU02S)

Note

Reference Information

2-6

SPEC

FUJ-29B001

FUH-29A001B

FUNCTION

29” 21”

REMARK

Table 2-3-6 TRANS

SPEC

AA26-00046A AA26-00044C

FUNCTION

29” 21”

REMARK

Table 2-3-7 TRANS FLYBACK (FBT)

Specifications

3-1

3. Specifications

Specifications are subject to change.

Television

System

Antena Input

Power

Consumption

Requirements

Frequency

Sound

Output

Effect

Jacks

Front

(AV2)

Back

PAL/SECAM-B/G,D/K,L,I, NTSC-M

100W (Applied When 29” Flat) 220V Only Free Voltage 50/60Hz 15W x 2CH

10W x 2CH 5W x 2CH

Vitual Dolby Turbo Sound Pseudo Stereo RCA Input

S-VHS Head-Phone

2Scart Input/Output

DVD Input(YPbPr) AV2 Monitor Audio Output

S-VHS

75ohms, Coaxial Cable

Not Present R815

Option

AV1 : Scart I/O, RGB Input,

RF Out

AV2 : Scart I/O, Monitor Out

Option

Option Option

P PF PT

PW MT

Function

NICAM 2 TUNER PIP 2 TUNER PIP, NICAM, TTX 2 TUNER PIP, A2 STEREO, TTX 2 TUNER PIP, A2 STEREO 2 TUNER MULTI PIP, A2 STEREO, NICAM, TTX A2 STEREO, TTX 1 TUNER PIP, A2 STEREO, TTX

NOTE

“NICAM” means that

A2 STEREO + NICAM

Specifications for Model Name (Ex. CS29A6??8X/HAC)

29 Inch

21 Inch

Alignment and Adjustments

4-1

4. Alignment and Adjustments

4-1 General Alignment Instructions

1. Usually, a color TV-VCR needs only slight touch-up adjustment upon installation. Check the basic characteristics such as height, horizontal and vertical sync and focus.

2. Observe the picture for good black and white details. There should be objectionable color shading; if color shading is present, demagnetize, perform purity and convergence adjustments described below.

3. Use the specified test equipment or its equivalent.

4. Correct impedance matching is essential.

5. Avoid overload. Excessive signal from a sweep generator might overload the front-end of the TV. When inserting signal markers, do not allow the marker generator to distort test results.

6. Connect the TV only to an AC power source with voltage and frequency as specified on the backcover nameplate.

7. Do not attempt to connect or disconnect any wires while the TV is turned on. Make sure that the power cord is disconnected before replacing any parts.

8. To protect against shock hazard, use an isolation transformer.

4-2 Automatic Degaussing

A degaussing coil is mounted around the picture tube, so that external degaussing after moving the TV should be unnecessary. But the receiver must be properly degaussed upon installation.

The degaussing coil operates for about 1 second after the power is switched ON. If the set is moved or turned in a different direction, the power should be OFF for at least 10 minutes.

If the chassis or parts of the cabinet become magnetized, poor color purity will result. If this happens, use an external degaussing coil. Slowly move the degaussing coil around the faceplate of the picture tube and the sides and front of the receiver. Slowly withdraw the coil to a distance of about 6 feet before turning power OFF.

If color shading persists, perform the following Color purity and Convergence adjustments.

4-3 High voltage Check

CAUTION : There is no high voltage adjustment on this chassis. The B+ power supply should be +135 volts (with full color- bar input and normal picture level).

1. Connect a digital voltmeter to the second anode of the picture tube.

2. Turn on the TV. Set the Brightness and Contrast controls to minimum (zero beam current).

3. Adjust the Brightness and contrast controls to both extremes. Ensure that the high voltage does not exceed 32 KV under any conditions.

Alignment and Adjustments

4-2

4-5 SCREEN Adjustment

1. Input Toshiba Pattern

2. Enter “Service Mode”.(Refer to “Service Mode”)

3. Select “G2-Adjust”.

4. Set the values as below.

4-4 Dynamic Focus Adjustment

1. A dynamic focus adjustment should be done after replacing the CRT PCB, FBT or CRT.

2. Input a crosshatch pattern.

3. Enter “ STANDARD “ in video mode.

4. Turn the Dynamic focus VR fully clockwise (maximum).( )

5. Turn the Static focus VR fully counterclockwise (maximum).( )

6. Slowly turn the static focus VR counterclockwise. Adjust until the vertical line in the middle of the screen has maximum clarity.( )

7. Slowly turn the dynamic focus VR (clockwise) and adjust the 3rd horizontal line for maximum clarity.( )

8. Repeat 4-7, if necessary.

29 Inch

IBRM = 220 WDRV = 35 CDL = 220 COLR G B = 150 150 150

21 Inch

IBRM = 220 WDRV = 35 CDL = 165 COL = 70

STATIC FOCUS VR

DYNAMIC FOCUS VR

SCREEN

Alignment and Adjustments

4-3

5. Turn the SCREEN VR until “MRCR G B” and “MRWDG” are green and those value are about 100. (The incorrect SCREEN Voltage may result that “MRCR G B” and “MRWDG” should be red)

When you do not have Toshiba Pattern, follow this method.

1. Set the TV on the condition that AV mode no signal(black)

2. Enter the “Menu” and set the mode to blue screen off.

3. Enter the “Service Mode”.

4. Select “ G2-Adjust”.

5. Set the values as below.

IBRM = 220

WDRV = 35 CDL = 220 COLR G B = 150 150 150

6. Turn the SCREEN VR until the value of “ MRCR G B” is about 120. Do not mind that

the “OSD” Color is red.

n After completing G2-Adjust, follow this procedure.

¨ Enter the “Video Adjust 1”. ¡ Choose any item in menu. (ex. Select “Red Cutoff”) ¬ Change the value of item you select, and recover the value.

For example, when the value of “Red Cutoff” is 127, change the value to 128 and restore the value to 127.

If you do not follow this procedure, the picture may be abnormal. For example, when the TV set is on, the picture becames brighter gradually.

Note 1.

Alignment and Adjustments

4-4

4-6 E2PROM (IC902) Replacement

1. When IC902 is replaced, all adjustment data revert to the initial values. So, all adjustment values when servicing should be readjusted.

2. After IC902 is replaced, connect the AC power supply cord.

3. Turn the power switch ON.

4. In stand-by, warm up the TV for at least 10 seconds.

5. Power on the TV.

4-7 White Balance Adjustment

n Equipment : Color-Analyzer (CA-100) n Input Signal : Pattern signal (Toshiba pattern)

1. Select STANDARD from the menu.

2. Input an 100% White pattern.

3. Enter the “Service Mode”. (Refer to “4-8 Service Mode”)

4. Warm up the TV set at least for 30 minutes.

5. Input a Toshiba pattern signal.

6. Enter the “Video Adjust1”.

- Adjust “Sub Contrast” so that Y (luminance) becomes 40 ft ± 3.

- Use “Red Drive” and “ Blue Drive” to adjust High-Light (x : 290, y : 300)

- Adjust “Sub Bright” so that Y (luminance) becomes 1.3ft ± 0.3.

- Use “Red Cutoff” and “Blue Cutoff” to adjust Low-Light (x : 290, y : 300).

7. Adjust CA-100 so that the final adjustment value can be fixed.

8. Use the Channel Up/Down (s/t) buttons to move the cursor on the adjustment modes.

9. Use the Volume +/- buttons to change the adjustment value.

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