Toshiba 21CZ8DE Schematic

SERVICE MANUAL

Color Television

21CZ8DE

FILE NO. 060-200564

S5ES series

The above model is classified as green product(s) (*1), as indicated by the underlined serial number(s). This Service Manual describes replacement parts for green product(s). When repairing any green product(s), use the parts described in this manual and lead-free solder (*2). For (*1) and (*2), see the next page.

Published in Singapore, September 2005 GREEN© TOSHIBA SINGAPORE PTE LTD

TABLE OF CONTENTS

CHAPTER 1 GENERAL ADJUSTMENTS

SAFETY INSTRUCTIONS ............................................................................................................................................. 3

SET-UP ADJUSTMENT ................................................................................................................................................. 4

SERVICE MODE ........................................................................................................................................................... 6

DESIGN MODE ............................................................................................................................................................. 9

ELECTRICAL ADJUSTMENTS ................................................................................................................................... 10

CIRCUIT CHECK ......................................................................................................................................................... 11

CHAPTER 2 SPECIFIC INFORMATIONS

SETTING & ADJUSTING DATA ................................................................................................................................... 12

NAMES AND FUNCTIONS OF CONTROLS .............................................................................................................. 13

PROGRAMMING CHANNEL MEMORY...................................................................................................................... 14

PROCEDURES TO SET HOTEL MODE ..................................................................................................................... 16

CHASSIS AND CABINET REPLACEMENT PARTS LIST ........................................................................................... 17

PC BOARDS BOTTOM VIEW...................................................................................................................................... 23

TERMINAL VIEW OF TRANSISTORS ........................................................................................................................ 26

CIRCUIT BLOCK DIAGRAM ....................................................................................................................................... 28

SPECIFICATIONS .................................................................................................................................................... END

APPENDIX:

CIRCUIT DIAGRAM

(*1)

The EC is actively promoting the WEEE & RoHS Directives that define standards for recycling and reuse of Waste Electrical and Electronic Equipment and for the Restriction of the use of certain Hazardous Substances. From July 1, 2006, the RoHS Directive will prohibit any marketing of new products containing lead.

Increasing attention is given to issues related to the global environmental. Toshiba Corporation recognizes environmental protection as a key management tasks, and is doing its utmost to enhance and improve the quality and scope of its environmental activities. In line with this, Toshiba proactively promotes Green Procurement, and seeks to purchase and use products, parts and materials that have low environmental impacts.

Green procurement of parts is not only confined to manufacture. The same green parts used in manufacture must also be used as replacement parts.

(*2)

This product is manufactured using lead-free solder as a part of a movement within the CE industry at large to be environmentally responsible. Lead-free solder must be used in the servicing and repair of this product.

GREEN PRODUCT PROCUREMENT

LEAD-FREE SOLDER

WARNING

This product is manufactured using lead free solder.

DO NOT USE LEAD BASED SOLDER TO REPAIR THIS PRODUCT!

The melting temperature of lead-free solder is higher than that of leaded solder by 86˚F to 104˚F (30˚C to 40˚C). Use of a soldering iron designed for lead-based solders to repair product made with lead-free solder may result in damage to the component and or PCB being soldered. Great care should be made to ensure high-quality soldering when servicing this product – especially when soldering large components, through-hole pins, and on PCBs – as the level of heat required to melt lead-free solder is high.

– 2 –

CHAPTER 1 GENERAL ADJUSTMENTS

SAFETY INSTRUCTIONS

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU-

TION” AND “PRODUCT SAFETY NOTICE” INSTRUCTIONS BELOW.

X-RAY RADIATION PRECAUTION

1. Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid such hazards, the high voltage must not be above the specified limit. The nominal value of the high voltage of this receiver is (A) kV at zero beam current (minimum brightness) under a (C) V AC power source. The high voltage must not, under any circumstances, exceed (B) kV.

Refer to table-1 for high voltage (A), (B) & AC voltage (C). (See SETTING & ADJUSTING DATA on page 12)

Each time a receiver requires servicing, the high voltage should be checked following the HIGH VOLTAGE CHECK procedure in this manual. It is recommended that the reading of the high voltage be recorded as a part of the service record. It is important to use an accurate and reliable high voltage meter.

SAFETY PRECAUTION

WARNING : Service should not be attempted by anyone unfamiliar with the necessary precautions on this receiver. The following

are the necessary precautions to be observed before servicing this chassis.

1. An isolation transformer should be connected in the power line between the receiver and the AC line before any service is performed on the receiver.

2. Always discharge the picture tube anode to the CRT conductive coating before handling the picture tube. The picture tube is highly evacuated and if broken, glass fragments will be violently expelled. Use shatter proof goggles and keep picture tube away from the unprotected body while handling.

3. When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in place, such as; nonmetallic control knobs, insulating covers, shields, isolation resistor-capacitor network etc.

2. The only source of X-RAY RADIATION in this TV receiver is the picture tube. For continued X-RAY RADIATION protection, the replacement tube must be exactly the same type tube as specified in the parts list.

3. Some part in this receiver have special safety-related characteristics for X-RAY RADIATION protection. For continued safety, parts replacement should be undertaken only after referring to the PRODUCT SAFETY NOTICE below.

GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These characteristics are often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this manual and its supplements; electrical components having such features are identified by the international hazard symbols on the schematic diagram and the parts list. Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement parts which do not have the same safety characteristics as specified in the parts list may create shock, fire, X-ray radiation or other hazards.

– 3 –

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU- TION” AND “PRODUCT SAFETY NOTICE” ON PAGE 3 OF THIS MANUAL.

R The following adjustments should be made when a complete realignment is required or a new picture tube is installed.

Perform the adjustments in order as follows :

1. Color Purity

2. Convergence

3. White Balance Note: The PURITY/CONVERGENCE MAGNET assembly and rubber wedges need mechanical positioning.

Refer to figure 1.

GENERAL ADJUSTMENTS

There are no adjustment of purity and convergence in some picture tube (Unified with purity magnet)

COLOR PURITY ADJUSTMENT NOTE : Before attempting any purity adjustments, the

1. Demagnetize the picture tube and cabinet using a degauss-

2. Set the brightness and contrast to maximum.

3. Use a green raster from a signal generator.

4. Loosen the clamp screw holding the yoke and slide the

SPECIFIC INFORMATIONS

Mounting position of the purity magnet assembly should fit to same position as old one because slightly difference to the position depend on a kind of tube.

receiver should be operated for at least fifteen minutes.

ing coil.

yoke backward or forward to provide vertical green belt (zone) in the picture screen.

SET-UP ADJUSTMENT

5. Remove the Rubber Wedges.

6. Rotate and spread the tabs of the purity magnet (See figure 2.) around the neck of the picture tube until the green belt is in the center of the screen. At the same time, enter the raster vertically.

7. Slowly move the yoke forward or backward until a uniform green screen is obtained. Tighten the clamp screw of the yoke temporarily.

8. Check the purity of the red and blue raster.

GLASS CLOTH TAPES

DEFLECTION YOKE

29.1mm(28", 29") 25mm(25") 19mm(19", 20", 21") 14mm(13", 14")

PURITY/ CONVERGENCE MAGNET ASS'Y

Figure 1.

TEMPORARY MOUNTING

RUBBER WEDGE

ADHESIVE

DEFLECTION YOKE

– 4 –

CONVERGENCE ADJUSTMENTS

NOTE: Before attempting any convergence adjustments, the

receiver should be operated for at least fifteen minutes.

R CENTER CONVERGENCE ADJUSTMENT

1. Use the cross-dot pattern from a signal generator.

2. Set the brightness and contrast for well defined pattern.

3. Adjust two tabs of the 4-Pole Magnets to change the angle between them (See figure 2.) and superimpose red and blue vertical lines in the center area of the picture screen.

4. Turn the both tabs at the same time keeping the angle constant to superimpose red and blue horizontal lines at the center of the screen.

5. Adjust two tabs of 6-Pole Magnets to superimpose red/ blue line and green one. Adjusting the angle affects the vertical lines and rotating both magnets affects the horizontal lines.

6. Repeat adjustments 3, 4, 5 keeping in mind red, green and blue movement, because 4-Pole Magnets and 6-Pole Magnets have mutual interaction and make dot movement complex.

6-POLE MAGNETS

4-POLE MAGNETS

R CIRCUMFERENCE CONVERGENCE ADJUSTMENT

1. Loosen the clamping screw of deflection yoke slightly to allow the yoke to tilt.

2. Temporarily put a wedge as shown in figure 1. (Do not remove cover paper on adhesive part of the wedge.)

3. Tilt front of the deflection yoke up or down to obtain better convergence in circumference. (See figure 3.) Push the mounted wedge into the space between picture tube and the yoke to fix the yoke temporarily.

4. Put other wedge into bottom space and remove the cover paper to stick.

5. Tilt front of the yoke right or left to obtain better convergence in circumference. (See figure 3.)

6. Keep the yoke position and put another wedge in either upper space. Remove cover paper and stick the wedge on picture tube to fix the yoke.

7. Detach the temporarily mounted wedge and put it in another upper space. Stick it on picture tube to fix the yoke.

8. After fixing three wedges, recheck overall convergence. Tighten the screw firmly to fix the yoke and check the yoke is firm.

9. Stick three adhesive tapes on wedges as shown in figure

ADJUST THE ANGLE (VERTICAL LINES)

FIXED

GENERAL ADJUSTMENTS

ROTATE TWO TABS AT THE SAME TIME (HORIZONTAL LINES)

PURITY MAGNETS

CONVERGENCE MAGNET ASSEMBLY ADJUSTMENT OF MAGNETS

Figure 2.

BLU RED

BLU

RED

4-POLE MAGNETS MOVEMENT

BGR

R G B

RGB

RED/BLU

GRN

Center Convergence by Convergence Magnets

B G R

RED/BLU GRN

6-POLE MAGNETS MOVEMENT

B G R

BGR

RGB

R G B

SPECIFIC INFORMATIONS

INCLINE THE YOKE UP (OR DOWN)

Circumference Convergence by DEF Yoke

Figure 3. Dot Movement Pattern

INCLINE THE YOKE RIGHT (OR LEFT)

– 5 –

1. ENTERING TO SERVICE MODE

1) Press o button once on Remote Control.

SERVICE MODE

2) Press o button again to keep pressing.

3) While pressing the o button, press MENU button on TV.

GENERAL ADJUSTMENTS

2. DISPLAYING THE ADJUSTMENT MENU

1) Press MENU button on TV.

Service mode

3. KEY FUNCTION IN THE SERVICE MODE

The following key entry during display of adjustment menu provides special functions.

A single horizontal line ON/OFF: - / - - button (on remote control) Test signal ON/OFF : a button (on TV or remote control) Selection of the adjustment items : Channel s/t (on TV or remote control) Change of the data value : Volume ; +/– (on TV or remote control) Adjustment menu mode ON/OFF : MENU button (on TV) Initialization of the memory (QA10) : CALL + Channel button on TV (s) Reset the count of operating protect

circuit to “00”: CALL + Channel button on TV (t)

“VG2” alignment : 0 button “BCUT” selection : 1 button

“GCUT”selection : 2 button “SCNT” selection : 4 button “COLC” selection : 5 button “TNTC” selection : 6 button “SBY” selection : 7 button

Self diagnostic display ON/OFF : 9 button

Press

Adjustment mode

Item

Data

(Service mode display)

Item

Data

Color thickness correction note: Displayed differently as shown below, depending

on the setting of the receiving color system. COLP (PAL) COLC (NTSC) COLS (SECAM)

CAUTION : Never try to perform initialization unless you have changed the memory IC.

– 6 –

4. SELECTING THE ADJUSTING ITEMS

1) Every pressing of CH s button in the service mode changes the adjustment items in the order of table-2. (t button for reverse order)

Refer to table-2 for preset data of adjustment mode. (See SETTING & ADJUSTING DATA on page 12)

5. ADJUSTING THE DATA

1) Pressing of ; +/– button will change the value of data in the range from 00H to FFH. The variable range depends on the adjusting item.

6. EXIT FROM SERVICE MODE

1) Pressing POWER button to turn off the TV once.

R INITIALIZATION OF MEMORY DATA OF QA02

After replacing QA10, the following initialization is required.

1. Enter the service mode, then select any register item.

2. Press and hold the CALL button on the remote control, then press the CH s button on the TV. The initialization of QA10 has been completed.

3. Check the picture carefully. If necessary, adjust any adjustment item above. Perform “ASM function” on the owner’s manual.

CAUTION: Never attempt to initialize the data unless QA02 has been replaced.

GENERAL ADJUSTMENTS

– 7 –

7. SELF DIAGNOSTIC FUNCTION

1) Press “9” button on the remote control during display of adjustment menu in the service mode. The diagnosis will begin to check if interface among IC’s are executed properly.

2) During diagnosis, the following displays are shown.

MICON : 23

S/W : E

2 3

EEP : V00

POWER : 000

GENERAL ADJUSTMENTS

BLOCK : UV V1 V2 V3

1 Part number of microprocessor (QA51) 2 Software type:

“ ECMVT A01” --------- Software for Asian models. “ ERFAP R01” --------- Software for Russian models. “ ERFAP P01” --------- Software for Middle East models.

3 Software version 4 Memory IC data version 5 Protection circuit operation count 6 BLOCK

UV : TV reception mode V1 : VIDEO 1 input mode (a1)

V2 : VIDEO 2 input mode (a2)

V3 : VIDEO 3 input mode (a3)

* * * * * *

* * * * *

V 1.00

Indicated color of mode now selected : Green and Red Indicated color of other modes : White

Green : Normal Red : The microprocessor operates to provide judgement

of no video signal.

OTHERS : (1) In case that power indicator is blinking with

interval of 0.5 seconds; it means protecting circuit (Current limiter) is operating, and circuit components may possibly be damaged. Check related components.

(2) In case that power indicator is blinking with

interval of 1 second; Protecting circuit does not operate, but a part of Bus line does not operate normally. Check Bus line.

– 8 –

1. ENTERING TO DESIGN MODE

1) When in Service mode (see

page 6), press CALL button on the remote control once.

DESIGN MODE

2) While pressing CALL button again and press MENU button on the TV.

3) Press MENU button on TV.

S D

(Design mode) (Adjustment mode)

When QA10 is initialized, items “OPT” ,“OPT1” and “OPT2” of DESIGN MODE are set to the data of the representative model of this chassis family. Therefore, because ON-SCREEN specification remains in the state of the representative of model. This model is required to reset the data of items “OPT” ,“OPT1” and “OPT2” according to current on-serviced model .

2. SELECTING THE ADJUSTING ITEMS

Every pressing of CH t button in the design mode changes the adjustment items in the order of table-3. (s button for reverse order)

Refer to table-3 for data of design mode. (See SETTING & ADJUSTING DATA on page 12)

3. ADJUSTING THE DATA

Pressing of ; -/+ buttons will change the value of data.

Press

ITEM

DATA

GENERAL ADJUSTMENTS

– 9 –

ELECTRICAL ADJUSTMENTS

ITEM

FOCUS VR ADJ

SUB-BRIGHTNESS (BRTC)

GENERAL ADJUSTMENTS

HORIZONTAL POSITION ADJUSTMENT (HPOS)

VERTICAL POSITION ADJUSTMENT (VPOS)

ADJUSTMENT PROCEDURE

1. Enter the service mode, then input AV1 black cross-bar pattern with signal generator.

2. Adjust the FOCUS control (on T461) for well defined scanning lines on the picture screen.

1. Input AV1 “5 steps pattern” with video signal generator.

2. Set CONTRAST to minimum and BRIGHTNESS to center by adjusting user controls.

3. Enter Service mode and press CH s/t to select BRTC.

4. Press ; –/+ buttons to adjust BRTC until step 0 and step 1 has the same blackness.

5. Exit service mode and press h button to set picture mode to DYNAMIC.

1. Enter the service mode, input AV1 black or white cross-bar signal with signal generator.

2. Select either HPOS (Horizontal picture phase) or VPOS (Vertical picture phase) with CH s/t buttons, and adjust horizontal or vertical picture position in the center of screen with ; –/+ buttons.

VERTICAL AMPLITUDE ADJUSTMENT (HIT)

1. Enter the service mode, input AV1 black or white cross-hatch signal with signal generator.

2. Select HIT (Vertical amplitude) with CH s/t buttons, and adjust vertical amplitude with ; –/+ buttons so that vertical amplitude lacks a little.

3. Adjust vertical amplitude with ; –/+ buttons so that the first bar on crosshatch signal touches edge of screen.

The first

– 10 –

ITEM

ADJUSTMENT PROCEDURE

WHITE BALANCE ADJUSTMENT

SCREEN VOLTAGE ADJUSTMENT (SCREEN VR) of FBT

• DRIVE ADJUSTMENT (GDRV) (BDRV) (RDRV)

• CUTOFF ADJUSTMENT (GCUT) (BCUT)

1. Select AV1 (with no input).

2. Enter Service mode and press “0” button.

3. Adjust Screen VR until OSD “HBC” toggle between 1 & 0.

4. Press “0” button again to exit.

5. Input AV1 “5 steps pattern” with video signal generator.

6. Press h button to set picture mode to DYNAMIC.

X To correct white balance in high light area

(steps 3 and 4) select GDRV, BDRV and RDRV with ; – /+buttons.

X To correct white balance in low light area

(steps 1 and 2), select GCUT and BCUT.

CIRCUIT CHECK

HIGH VOLTAGE CHECK CAUTION: There is no HIGH VOLTAGE ADJUSTMENT on this chassis. Checking should be done following the steps below.

1. Connect an accurate high voltage meter to the second anode of the picture tube.

2. Turn on the receiver. Set the BRIGHTNESS and CONTRAST controls to minimum (zero beam current).

3. High voltage must be measured below (B) kV.

GENERAL ADJUSTMENTS

Refer to table-1 for high voltage (B). (See SETTING & ADJUSTING DATA on page 12)

4. Vary the BRIGHTNESS control to both extremes to be sure the high voltage does not exceed the limit under any conditions.

– 11 –

CHAPTER 2 SPECIFIC INFORMATIONS

SETTING & ADJUSTING DATA

SAFETY INSTRUCTIONS

HIGH VOLTAGE AT MAX BEAM CURRENT: (A) 30.0 kV MAX HIGH VOLTAGE: (B) 32.0 kV AC VOLTAGE (C) 110-240 V

Table-1

SERVICE MODE

ADJUSTING ITEMS AND DATAS IN THE SERVICE MODE:

21"

SPECIFIC INFORMATIONS

Item

BCUT B CUTOFF (B/W) 20H GCUT G CUTOFF (B/W) 20H RDRV R DRIVE 20H GDRV G DRIVE 20H BDRV B DRIVE 20H BRTC SUB BRIGHT CENTER 24H COLC SUB COLOR CENTER NTSC 1EH TNTC SUB TINT CENTER 1EH COLP SUB COLOR CENTER PAL 1DH COLS SUB COLOR CENTER SECAM 1DH SCNT SUB CONTRAST TV 00H SBY SECAM B-Y BLACK OFFSET 01H VPOS 50Hz V-POSITION 1CH HIT HEIGHT 25H VLIN V-LINEARITY 24H HPOS H-POSITION 2BH WID EW WIDTH 31H PARA EW PARABOLA 17H TRAP EW TRAPEZIUM 26H TCNR EW UPPER PARABOLA 15H BCNR EW LOWER PARABOLA 15H HPLL HBOW HORIZONTAL BOW 20H XCAL CRYSTAL CALIBRATION 30H RAGC AGC TAKE-OVER 12H CTR1 CONTROL 1 07H

HORIZONTAL PARALLELOGRAM

Adjustment Reference Data

22H

Adjust Data

← ← ← ← ← ← ← ← ← ← ← ← ← ← ← ← ← ← ← ← ← ← ← ← ← ←

Table-2

– 12 –

NAMES AND FUNCTIONS OF CONTROLS

TV Front and Remote control

SPECIFIC INFORMATIONS

– 13 –

PROGRAMMING CHANNEL MEMORY

SPECIFIC INFORMATIONS

Preset the channels automatically (ASM function)

Use remote control for this operation. The buttons on the TV with similar name may also be use.

Select the starting position for channel to be preset.

Press the Number buttons (-/--, 0~9) or CH s/t.

Set the correct broadcast system for your region. Press

MENU and then ; -/+ to highlight the “ SET UP”

icon.

SETUP

ENGLISH

LANGUAGE COLOR MODE SOUND MODE SKIP BLUE SCREEN TEXT

SELECT / ADJUST –/+ BACK

Confirm “COLOR MODE” is set to “AU TO” and “SOUND MODE” is set to proper system. If not, press

CH s/t to select “COLOR MODE” or “SOUND MODE” and press ; -/+ to set each proper system.

AUTO

FAST

B/G OFF

To use the SEARCH function

Press MENU and then ; -/+ to highlight

the “ TUNING” icon.

TUNING MFT AFT ASM SEARCH POSITION MEMORY

SELECT / MENU –/+ BACK

Press CH s/t to select “SEARCH”. Press ; -/+ to

start searching. Pressing “–” searches for channels at lower frequencies while pressing “+” searches for channels at higher frequencies. While searching, pressing the opposite direction button, + and respectively, will cancel SEARCH function.

TUNING MFT AFT ASM SEARCH POSITION MEMORY

SELECT / ADJUST –/+ BACK

P001

SEARCH VHF H P001

STOP

Press MENU and then ; -/+ to highlight

the “ TUNING” icon. Select “ASM”, then press ; + to start the search. When the TV screen returns to the start position, the procedure is complete.

TUNING MFT AFT ASM SEARCH POSITION MEMORY

SELECT / ADJUST –/+ BACK

OFF

P001

Presetting channel

• First, use the ASM (Automatic Search Memory) function to preset all active channels in your area automatically. Then, arrange the preset channels with the SEARCH, SKIP and MFT (Manual Fine Tuning) functions so that you can tune into only desired channels.

• Use the SEARCH function if desired channels cannot be preset with the ASM or if you would like to preset channels to specific position numbers one by one.

Repeat this process until you can get the desired channel.

When the desired channel is shown, press CH t to

select “POSITION”. Press the ; -/+ buttons repeatedly until the position number to be preset is shown.

TUNING MFT AFT ASM SEARCH POSITION MEMORY

SELECT / ADJUST –/+ BACK

Press CH s/t to select “MEMORY”, then press ; +

to memorize the channel at the current position.

TUNING MFT AFT ASM SEARCH POSITION MEMORY

SELECT / ADJUST –/+ BACK

OFF

P002

OFF

P002

– 14 –

When you program other channels, repeat steps 2 to

+ 32 hidden pages