TOSHIBA 51HX84, 57HX84 Service Manual

FILE NO. 020-200410

DOCUMENT CREATED IN JAPAN, July, 2004

SERVICE MANUAL

Projection Television

N4PS Chassis

51HX84 57HX84

TABLE OF CONTENTS

CHAPTER 1 GENERAL ADJUSTMENTS

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

CRT ASSEMBLY REPLACEMENT AND MOUNTING ................................................................................................... 4

PICTURE TUBE COMPONENTS ADJUSTMENT .......................................................................................................... 6

REPLACEMENT OF THE CRT....................................................................................................................................... 9

SERVICE MODE .......................................................................................................................................................... 10

ELECTRICAL ADJUSTMENT ...................................................................................................................................... 12

CONVERGENCE ADJUSTMENT ................................................................................................................................ 16

SCREEN AND MIRROR ALIGNMENTS ...................................................................................................................... 19

CIRCUIT CHECKS ....................................................................................................................................................... 20

CHAPTER 2 SPECIFIC INFORMATIONS

SETTING & ADJUSTING DATA .................................................................................................................................... 21

LOCATION OF CONTROLS ......................................................................................................................................... 22

ADDING CHANNELS TO THE TV'S MEMORY ............................................................................................................ 24

MECHANICAL DISASSEMBLY .................................................................................................................................... 25

CHASSIS REPLACEMENT PARTS LIST ..................................................................................................................... 27

PC BOARDS BOTTOM VIEW ...................................................................................................................................... 36

TERMINAL VIEW OF TRANSISTORS ......................................................................................................................... 48

CIRCUIT BLOCK DIAGRAM ........................................................................................................................................ 51

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

APPENDIX:

CIRCUIT DIAGRAM

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 120V AC power source. The high voltage must not, under any circumstances, exceed (B) kV.

Refer to table-1 for high voltage (A), (B). (See SETTING & ADJUSTING DATA on page 21)

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; non-metallic control knobs, insulating covers, shields, isolation resistor-capacitor network etc.

4. Before returning the set to the customer, always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as antennas, terminals, screwheads, metal overlays, control shafts etc. to be sure the set is safe to operate without danger of electrical shock. Plug the AC line cord directly into a 120V AC outlet (do not use a line isolation transformer during this check). Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the following manner:

PRODUCT SAFETY NOTICE

2. This receiver is equipped with a Fail Safe (FS) circuit which prevents the receiver from producing an excessively high voltage even if the B+ voltage increases abnormally. Each time the receiver is serviced, the FS circuit must be checked to determine that the circuit is properly functioning, following the FS CIRCUIT CHECK procedure in this manual.

3. 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.

4. 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.

Connect a 1500 ohm 10 watt resistor, paralleled by a 0.15

F, AC type capacitor, between a known good earth ground (water pipe, conduit, etc.) and the exposed metallic parts, one at a time. Measure the AC voltage across the combination of 1500 ohm resistor and 0.15 µF capacitor. Re- verse the AC plug at the AC outlet and repeat AC voltage measurements for each exposed metallic part. Voltage measured must not exceed 0.675 volts rms. This corresponds to 0.45 milliamp. AC. Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately.

AC VOLTMETER

0.15 µF

Place this probe on

Good earth ground such as a water pipe, conduit, etc.

1500 ohm 10 watt

each exposed metallic part.

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.

CRT ASSEMBLY REPLACEMENT AND MOUNTING

CAUTION : DO NOT LOOSEN THE HEX HEAD BOLTS WITH SPRINGS (12 PCS), BECAUSE THOSE ARE FOR

SEALING OF CRT COOLANT.

Lens Assembly

Attention Serviceman

The Hex Head Bolts with Springs. (see sketch) used on CRT assembly, are NOT

Adjustment Screws DO NOT LOOSEN-FLUID LEAKAGE WILL OCCUR.

4 Screws

CRT Assembly

S.V.M. Coil

CRT DRIVE Board

Deflection Yoke and Conver Yoke

Lens and Neck Components View

CRT Mounting

TO REMOVE CRT (Same procedure for R, G, B)

1. Remove CRT DRIVE Board, S. V. M. COIL and DEF. YOKE from CRT.

2. Remove Lens Assembly.

3. Detach CRT Anode Cap from CRT.

4. Remove CRT Assembly from CRT Mounting.

CRT REPLACEMENT (Same procedure for R, G, B) Reverse the removal procedures except the followings.

1. Anode Cable should be replaced with new one. See “SERVICING PRECAUTIONS” shown below.

2. Install silicon (T461B) to the CRT, replace the Anode cable and put enough silicon again on around the Anode Cap as illustrated.

Anode Cap

CAUTION: Align the Anode cable as illustrated on page

ADJUSTING PROCEDURE IN REPLACING CRT

1. R.G.B. FOCUS ADJUSTMENT (page 7.)

2. PICTURE TILT ADJUSTMENT (page 7.)

3. USER CONVERGENCE CENTER CHECK (See owner's manual.)

4. CENTERING ADJUSTMENT (page 7.)

5. CONVERGENCE ADJUSTMENT (page 16.)

6. WHITE BALANCE ADJUSTMENT (page 12.)

Adjustments are complete.

Silicon (On shaded area) TSE3843W #23960136

2 ~ 5 mm

15 ~ 25 mm

SERVICING PRECAUTIONS

Do not use a magnetized screw driver for screws of Deflection Yoke and Velocity Modulation Coil to avoid magnetization of electron gun. Magnetization of electron gun will degrade basic function and result in unbalance of right and left shift of user static convergence, and result in no variable quantity.

Screw for D.Y

Screw for SVM coil

When replacing the anode cap assembly (CRT) or anode lead assembly (F.B.T.), remove the anode lead holder from old one and attach the holder again to new anode lead.

Check the point of anode lead in a straight line, if it is winding, please revise it.

Anode lead holder

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

PICTURE TUBE COMPONENTS ADJUSTMENT

DESCRIPTION OF NECK COMPONENTS



 Deflection yoke and convergence yoke

The position on the neck is required most front (CRT funnel side) and the screw is fastened after rotating yoke adjusting picture tilt.

 Centering magnet

After adjusting picture tilt, picture position is finally fixed by this magnet. In order to get maximum margin of user convergence control for center of screen, this magnet have to be used for center convergence adjustment.



PREPARATION

Operate the receiver for at least 5 minutes.

R, G, B FOCUS ADJUSTMENT

1. Before adjusting the R, G, B FOCUS, remove the 4 screws of Lens Assembly which is fixed on the CRT Assembly. (See page 4.) Then turn around the Lens Assembly by 180 to adjust the fastening screw (Fig. a) and fasten the 4 screws to secure Lens Assembly.

2. Select the adjustment mode. (See page 10.)

3. Press “7” button to display the built-in cross-hatch.

4. Press “0” and “RTN” buttons to make the picture a single Red color.

100 button ................ to erase Red color

0 button .................... to erase Green color

RTN button .............. to erase Blue color.

5. Loosen the fasten screw and adjust Red lens focus to best focusing point of picture center. Then fasten the screw. (See Fig. a.)

Fig. a

6. Adjust FOCUS VR “R” of FOCUS PACK to find best focusing point of picture center.

7. Repeat steps 3 to 5 for Green and Blue colors.

TILT ADJUSTMENT

Rotate R, G, B deflection yoke so that picture becomes horizon, then fasten screw.

CENTERING ADJUSTMENT

1. Stretch a thread between two center of screen edge (top and bottom, left and right).

2. Receive NTSC. Then select SERVICE MODE. (See Page 10.)

3. Select CONVERGENCE ADJUSTING mode, and press "7" button to display the internal net pattern. Move Cursol and recognize horizontal line indicated Y:4. This line is vertical center. Push "9" button to display the vertical stripes, and recognaize horizontal center.

4. Perform VCEN adjustment. (See page 17.)

5. Adjust G centering magnet so that the cross-bar pattern center comes to screen center.

6. Perform HEIGHT adjustment .

7. Perform VERT. LINEARITY adjustment.

8. Perform WIDTH adjustment. (See page 17.)

9. Check whole quality of green line.

. Adjust R, B centering magnet so that the cross-bar pat-

tern center comes to screen center.

LOCATION OF SCREEN AND FOCUS VR’S

SCREEN

COVER

Speaker grille

FOCUS

REPLACEMENT OF THE CRT

Service parts are provided for each R, G and B. The contents of the parts are as follows.

RG B

57HX84 HOKUTO

51HX84 HITACHI 2334122

REPLACEMENT OF HIGH VOLTAGE CABLE

ANODE LEAD

RUBBER BOOT

LEAD HOLDER

Z450 TPA5011

Fig. a

2334118

2334119

2334123

1. When replacing Anode Lead or Anode Cap with new one, remove Lead Holder from old lead as shown in figure below, and put it on new lead. Do not throw away Lead Holder.

NOTE : THE LEAD HOLDER IS ATTACHED TO TPA5011

(Z450), BUT IS NOT ATTACHED TO ANODE LEAD AND ANODE CAP. RUBBER BOOT IS ATTACHED TO ANODE LEAD AND ANODE CAP.

2. Detaching Lead Holder

RUBBER BOOT

LOCK LEAD HOLDER

Fig. b

2334120

2334124

OLD ANODE LEAD

ANODE CAP

Cut here rubber boot and lead together to detach Lead Holder.

SERVICE MODE

1. ENTERING TO SERVICE MODE

1) Press MUTE button twice on Remote Control.

MUTE

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.

2) Press MUTE button again to keep pressing.

Adjustment mode

Press

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

(Service mode display)

Item

Data

Screen adjustment mode ON/OFF: TV (ANT)/VIDEO button (on TV) Selection of the adjustment items : Channel / (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) : RECALL+Channel button on TV ( ) Initialization of the self diagnostic data: RECALL+Channel button on TV ( )

“RCUT” selection : 1 button “GCUT” selection : 2 button “BCUT” selection : 3 button “SCNT” selection : 4 button “COLC” selection : 5 button Convergence adj : 7 button Self diagnostic display : 9 button

4. SELECTING THE ADJUSTING ITEMS

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

Refer to table-2 for preset data of adjustment mode. (See SETTING & ADJUSTING DATA on page 21)

5. ADJUSTING THE DATA

1) Pressing of VOLUME or 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 RECALL button on the Remote, then press the CHANNEL button on the TV. The initialization of QA02 has been complated.

3. Check the picture carefully. If necessary, adjust any adjustment item above. Perform “Programming Channel Memory” on the owner's manual.

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

7. 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.

SELF CHECK NO. 23 * * * * * * POWER : 000 BUS LINE : OK BUS CONT : OK BLOCK : MAIN SUB SET ID : 01 EEP VER : 02 OPT1 : 05 OPT2 : 70 HDMI NO * * * * * * * * ERR CODE :

Part number of microprocessor (QA01)

Operation number of protection circuit (current limiter) . . . . “000” is normal.

BUS line check “OK” ................... Normal

“SCL-GND” or “NG” ........... SCL-GND short circuit

“SDA-GND” or “NG” ........... SDA-GND short circuit

“SCL-SDA” or “NG” ............ SCL-SDA short circuit

BUS line ACK (acknowledge) check

“OK” ..................... Normal

Display of Location Number . . . . NG

(Display example) “QA02 NG”, “H001 NG”, “Q501 NG” etc. Note: The indication of failure place is only one place though failure places are plural. When

repair of a failure place finishes, the next failure place is indicated. (The order of priority of indication is left side.)

Sync. signal check Green display ..... Normal

Red display ........ NG

MAIN ........ Main sync

SUB .......... Sub sync (when turn on the PIP)

ID code for TV Set Version of "EEP" Data for "OPT" Part number of HDMI microprocessor HDMI error code

ADJUSTMENT

SPECIFICATION

ELECTRICAL ADJUSTMENT

10500k+0UV

Same spec is ap-

plied on dark area

and bright area.

5TH

BAR SUNK

SIGNAL

White luster signal

(Valuable input level)

CHANNEL 3

SUB-BRIGHT

SIGNAL

5th bar sunk

PROCESS INSTRUCTIONS

ADJUSTING

1. Heart run minimum 15minutes.

2. Go into screen adjustment mode.

ITEM

SCREEN ADJUST

Adjust Focus pack Screen VR of Red, Green, and Blue by looking directly into each

CRT and adjusting each screen VR until CRT is just lit on left side of CRT.

area.

BLUE DRIVE, RED BIAS and BLUE BIAS.

Adjust RED DRIVE, BLUE DRIVE for bright area, and adjust RED BIAS and BLUE

BIAS for dark area.

1. Adjust white luster level to get 4.3cd/m2 on dark area, and get 264.3cd/m2 on bright

2. Using the data up and down keys, cycle through the adjustments for RED DRIVE,

WHITE BARANCE

ADJUSTMENT

3. Continue to make adjustments color temperature to spec on each area.

1. Receive channel 3 Sub-Bright pattern.

2. Go into BRTC of service mode.

3. Press DATA UP/DOWN to adjust Sub-Bright level to spec.

SUB-BRIGHT

ADJUSTMENT

G Dot cross (NTSC)

B Dot cross (NTSC)

Electrical Focus : R Dot cross (NTSC)

• User Adjustment : SPORTS (CONTRAST MAX, BRIGHTNESS CENTER)

• Adjust after Centering Magnet adjusts.

• Signal : Lens Focus : R Dot cross (NTSC)

ADJUSTMENT METHOD

(Condition)

G Dot cross (NTSC)

B Dot cross (NTSC)

1) Rough Adjust the lens focus and electrical focus of each color(R, G, B).

(Adjustment)

1. Common Items

Adjust Green electrical focus VR on focus pack (Z410) for best center focus.

1) Receive green single color by shielding jig.

2) Receive the Dot Cross pattern.

3) Adjust Green electrical focus.

2. Green Adjustment

Red flare width : 1mm

If the focus blur on screen center and circumference, adjust the electrical focus is best point on all of screen.

Receive the Dot Cross pattern. Adjust Green lens for best center focus.

Green lens focus adjustment target

Dot-cross has red flare (red flare width :1mm)

4) Adjust Green lens focus.

5) Repeat (3)~(4),and adjust best focus point.

ITEM

FOCUS ADJUSTMENT (1/2)

Focus Adjustment

Adjust Red electrical focus VR on focus pack (Z410) for best center focus.

Receive the Dot Cross pattern. Adjust Red lens for best center focus.

1) Receive Red single color by shielding jig.

2) Receive the Dot Cross pattern.

3) Adjust Red electrical focus.

4) Adjust Red lens focus.

ADJUSTMENT METHOD

3. Red Adjustment

ITEM

FOCUS ADJUSTMENT (2/2)

Focus Adjustment

5) Repeat (3)~(4),and adjust best focus point.

1) Receive Blue single color by shielding jig.

2) Receive the Dot Cross pattern.

4. Blue Adjustment

3) Adjust Blue electrical focus.

Adjust Blue electrical focus VR on focus pack (Z410) for best center focus.

(The Brightness is minimum point of Blue.)

Receive the Dot Cross pattern. Adjust the Blue lens for best center focus.

After easy lens adjustment, turn to right side lens focus screw,

and so dot-cross has flare.

Next turn left focus screw, so flare disappears in Dot-Cross and Dot-Cross become blur.

This point is blue lens focus adjustment target. (flare disappear and become blur)

4) Adjust Blue lens focus.

+ 32 hidden pages