Toshiba 29SF6SH Schematic

FILE NO. 070-200310

SERVICE MANUAL

COLOUR TELEVISION

D3ES Chassis

29SF6SH

May, 2003

CHAPTER 1 GENERAL ADJUSTMENTS

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

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

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

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

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

CIRCUIT CHECK .................................................................................................................................................... 14

GENERAL ADJUSTMENTS

CHAPTER 2 SPECIFIC INFORMATIONS

SETTING & ADJUSTING DATA .............................................................................................................................. 15

LOCATION OF CONTROLS ................................................................................................................................... 16

PROGRAMMING CHANNEL MEMORY................................................................................................................. 18

CHASSIS AND CABINET REPLACEMENT PARTS LIST ......................................................................................20

PC BOARDS BOTTOM VIEW................................................................................................................................. 29

TERMINAL VIEW OF TRANSISTORS ................................................................................................................... 33

CIRCUIT BLOCK DIAGRAM .................................................................................................................................. 36

SPECIFIC INFORMATIONS

SPECIFICATIONS ............................................................................................................................................... End

APPENDIX:

CIRCUIT DIAGRAM

– 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 15)

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 SERVICE MANUAL.

SET-UP ADJUSTMENT (FOR FLAT TUBE)

■ 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.

COLOR PURITY ADUSTMENT

(1)Let the screen face in the installing direction or toward the east (when it is to be moved), bring up the service mode

GENERAL ADJUSTMENTS

screen after demagnetizing (front, left, right, and top) with the degaussing coil, receive white signals by pressing the [TV/VIDEO] button, and then the receiver should be operated for more than 40 minutes.

(2)Perform rough adjustment of the central convergence with the P/C magnet according to the adjustment item.

(3)Receive built-in green signals, loosen set screws on the deflection yoke, remove rubber wedges, and shift the deflection

yoke to toward front.

(4)Move alternately the two 2-pole magnets of the P/C magnets so that the green raster can come to the center of the

screen.

Figure 1.

2-pole purity magnet

(27": Magnet is fixed with deflection yoke.)

SPECIFIC INFORMATIONS

Green Belt

Sub-4-pole convergence magnet (32" : 34") Sub-4-pole convergence magnet (to be installed on deflection yoke for 30", 32”)

Main 4-pole convergence magnet (30" : 32") 6-pole convergence magnet (34") 6-pole convergence magnet (30" : 32") Main 4-pole convergence magnet (34")

P/C magnet installing position A

• 30"=26.5 mm

• 32"=30.5 mm or 32.5 mm

• 34"=37 mm

• 34"=39 mm

(5)Receive built-in red and blue signals, check that there is no inclination of the single color raster toward one side, and if

each color tilts to a great extent, make adjustment with the 2-pole magnet so that the 3 colors will come to the center evenly.

(6)Receive the green raster, shift the deflection yoke from a

foremost position (hitting against the picture tube) to a

Shift deflection yoke

(7) Perform marking of each point

(6)

(8)

on the tape of picture tube

backward position horizontally, stop the deflection yoke at a position where it begins to become a green raster, and perform accurate marking on the picture tube.

(7)Shift the deflection yoke further backward, and perform

Picture tube

CRT-D board

accurate marking at a position where the green raster begins to being luck.

(8)Fix the deflection yoke at a position 60% forward within

the range marked in items (6) and (7) above.

CONVERGENCE ADJUSTMENTS

100 60 0%

Fix the deflection yoke at a position 60% forward from a point between (6) and (7)

P/C Mag

* Adjust the convergence magnet to get vest convergence in the the order to (1) ~ (5).

■ CENTER CONVERGENCE:

(1)Receive the white crosshatch or dot pattern from the service signal generator.

(2)Use the 2 pieces of main 4-pole magnets of P/C magnets, change the open angle, and align the red and blue vertical

lines on the screen center.

(3)Freeze the open angle of the main 4-pole magnets, turn them simultaneously, and align the horizontal lines.

(4)Take the same steps for items (2) and (3) above and align red/blue with green on the screen center using two 6-pole

magnets.

– 4 –

(5)Adjust the sub-4-pole magnets only in case there is any deviation of Xv bow-shaped convergence. (To be usually set at

the initial position)

Align both sides with the sub-4-pole magnets and minimize the deviation of blue and red with the main 4-pole magnets.

blue

blue red

red

Main 4-pole magnet

red/blue

green

6-pole magnet

■ CIRCUMFERENCE CONVERGENCE:

Perform correction in the following manner.

blue

green red

(Parts code:23 948 274) TC-S

blue

green

red

S N

Blue color or blue mark

*Insert the correction piece between the picture tube and the deflection yoke.

Bonded surface

(Insertion position of correction piece)

Adjust VR 1 and minimize the deviation of YH. *Only 27", 30" and 32".

Red

green

blue

green

Red

Xv bow-shaped deviation of convergence

blue

green

red

Sub-4-pole magnet

• Adjust coils and minimize deviation (The 27” unit has coils underneath it)

■ 30", 27", 32"

blue

green

red

(Parts code:23 948 464)

N S

Bonded surface

GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

Red

green

blue

green

Red

Adjust VR 2 (YHC) and minimize the deviation of YH.

Red

blue

green

blue

Red

blue

Red

green

Red

blue

Adjust VR 3 (YV) and minimize the deviation of YV.

Red

green

blue

green

Red

blue

green

blue

red

green

blue

red

blue

green

Red

green

blue

green

Red

blue

VR3

VR2 VR1

■ 34"

YV YHC

27" (Part No. 23 947 371) 32", 30" (Part No. 23 947 121) 34" (Part No. 23 993 080)

Perform correction by inserting the

correction piece into the clearance of terminal board coils of the deflection yoke.

Note:

Perform insertion by turning the

metal side to the terminal board side of the deflection yoke.

– 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 set.

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.

SPECIFIC INFORMATIONS

A single horizontal line ON/OFF: - / - - button (on Remote) or a button (on TV) Test signal selection : a button (on Remote) Selection of the adjustment items : Channel s/t (on TV or Remote) Change of the data value : Volume ; +/– (on TV or Remote) Adjustment menu mode ON/OFF : MENU button (on TV) Initialization of the memory (QA02) : CALL + Channel button on TV (s) Reset the count of operating protect

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

“RCUT” selection : 1 button “GCUT” selection : 2 button “BCUT” selection : 3 button “CNTX” (or “SCNT”) selection : 4 button “COLC” selection : 5 button “TNTC” selection : 6 button

Test audio signal ON/OFF (1kHz) : 8 button Self diagnostic display ON/OFF : 9 button

Press

Adjustment mode

Item

Data

Item

Data

(Service mode display)

Color thickness correction note: Displayed differently as shown below, de-

pending 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.

The key function marked with are not usable to control in the Test signal for some model.

– 6 –

4. SELECTING THE ADJUSTING ITEMS

1) Every pressing of CHANNEL 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 15)

5. ADJUSTING THE DATA

1) Pressing of VOLUME ; +/– 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.

■ INITIALIZATION OF MEMORY DATA OF QA02

After replacing QA02, 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, then press the CHANNEL s button on the TV. The initialization of QA02 has

been complated.

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

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

7. TEST SIGNAL SELECTION

1) Every pressing of a button on the Remote Control changes the built-in test patterns on screen as described below in

SERVICE MODE.

GENERAL ADJUSTMENTS

Signal off

NTSC signals (14 patterns)

PAL signals (14 patterns)

Signals Picture

• Red raster

• Green raster

• Blue raster

• All Black

• All White

• Black & White

• Black cross-bar

• White cross-bar

• Black cross-bar

on green raster

• Black cross-hatch

• White cross-hatch

• Black cross-dot

• White cross-dot

SPECIFIC INFORMATIONS

• H signal (white)

• H signal (black)

The signals marked with are not usable to display in the Test signal for some model.

– 7 –

8. SELF DIAGNOSTIC FUNCTION

1) Press “9” button on 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.

Indicated color of mode now selected : Green and Red

2390****



POWER : 00



BUS LINE : OK



BUS CONT : OK



BLOCK : UV V1 V2 V3



QV01

GENERAL ADJUSTMENTS

 Part number of microcomputer (QA01)  Operation number of protecting circuit ----“00” is nor-

mal. When indication is other than “00”, overcurrent apts to flow, and circuit parts may possibly be damaged.

 BUS LINE CHECK ----“OK” is normal.

“SDA1-GND” ------------- SDA-GND short circuit. “SCL1-GND” -------------- SCL-GND short circuit. “SCL1-SDA1” ------------- SCL-SDA short circuit.

 BUS CONT ----“OK” is normal.

When indication shows “Q uuu NG”, the device with

SPECIFIC INFORMATIONS

the number may possibly be damaged.

BLOCK

UV : TV reception mode V1 : VIDEO 1 input mode (a1) V2 : VIDEO 2 input mode (a2) V3 : VIDEO 3 input mode (a3)

Indicated color of other modes : White

Green : Normal Red : The microcomputer operates to provide judgement

of no video signal. The red color is still indicated though the signal is input, failure may exist in input signal line including QV01.

QV01 : In case of indication green ---Normal

In case of indication red with input signal---Failure may exist in output line including QV01.

The items marked with are not usable to display in the SELF DIAGNOSTIC FUNCTION for some model.

– 8 –

1. ENTERING TO DESIGN MODE

1) Select the Service mode.

DESIGN MODE

2) While pressing Remote and press MENU button on TV.

o(or CALL) button on

3) Press MENU button on TV.

S D

(Design mode) (Adjustment mode)

When QA02 is initialized, items “OPT1”, “OPT2” and “OPT3” 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 “OPT1”, “OPT2” and “OPT3”.

2. SELECTING THE ADJUSTING ITEMS

Every pressing of CHANNEL 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 15)

3. ADJUSTING THE DATA

Pressing of VOLUME s or t button will change the value of data.

Press

ITEM

DATA

GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

– 9 –

ELECTRICAL ADJUSTMENTS

ITEM ADJUSTMENT PROCEDURE

FOCUS VR ADJ

SUB-BRIGHTNESS (BRTC)

GENERAL ADJUSTMENTS

SPECIFIC INFORMATIONS

Note: Constrict the picture height

until the vertical retrace line appears adjusting the item HIT (HEIGHT).

HORIZONTAL POSITION ADJUSTMENT (HPOS)

VERTICAL POSITION ADJUSTMENT (VPOS)

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

2. Press the TV/VIDEO button on the Remote until the black cross-bar pattern appears on the screen.

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

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

2. Set the TV in service mode to get white cross-bar of inside pattern.

3. Select BRTC (brightness correction), and adjust the ; – /+ button to reduce the value so that white portion of inside pattern slightly light.

4. Adjust ; – /+ button to increase the data value of BRTC, and set it just before the difference between the belt of vertical retrace and the border of black portion of inside pattern is visible. After that, return vertical height and contrast.

1. Set the TV in service mode, and get black or white cross-bar signal with VIDEO button on remote hand unit.

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

Belt of vertical retrace

VERTICAL AMPLITUDE ADJUSTMENT (HIT)

1. Set the TV in service mode, and get black or white cross-hatch signal with VIDEO button on remote hand unit.

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

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

The first

– 10 –

ITEM ADJUSTMENT PROCEDURE

WHITE BALANCE ADJUSTMENT

CUTOFF ADJUSTMENT

•

(RCUT) (GCUT) (BCUT)

DRIVE ADJUSTMENT

•

(GDRV) (BDRV)

NOTE: It is released built-in test pattern by changing the adjustment item for some model.

In this case, select the adjustment item with channel st button first and then select the built-in test pattern with -/- - button.

1. Set Contrast to 40, and brightness to +20 by picture control.

2. Set the TV in service mode, and get the inside W/B adjusting signal with VIDEO

button.

3. Select RCUT, GCUT and BCUT with CHANNEL s, t buttons, to set individual

values to Initial reference data, and to set GDRV and BDRV to Initial reference data with VOLUME ; – /+ buttons (See page 19).

4. Press -/- - button on the remote control and rotate Screen VR to get one slight

horizontal line on screen. Note: Every pressing of -/- - button provides Horizontal line picture and Normal picture alternately.

5. Press -/- - button to release horizontal line picture, and select the two other colors

which did not light in the above step with CHANNEL s, t buttons. Then tap VOL- UME ; – /+ buttons so that three colors slightly light in the same level.

X To correct white balance in light area,

select GDRV and BDRV with CHANNEL s, t buttons to adjust.

X To correct white balance in dark area,

perform fine adjustment of RCUT, GCUT and BCUT.

GENERAL ADJUSTMENTS

Light area check

(to show white)

Dark area check

(to show black)

SPECIFIC INFORMATIONS

– 11 –

+ 25 hidden pages

Toshiba 29SF6SH Schematic

TABLE OF CONTENTS

CHAPTER 1 GENERAL ADJUSTMENTS

SAFETY INSTRUCTIONS

SERVICE MODE

DESIGN MODE

ELECTRICAL ADJUSTMENTS