Toshiba 46H84, 51H84, 57H84 Schematic

FILE NO. 020-200404
REVISED.1
SERVICE MANUAL
Projection Television
46H84 51H84
57H84 46H84C 51H84C 57H84C
DOCUMENT CREATED IN JAPAN, Oct., 2004
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 ................................................................................................................................ 15
SCREEN AND MIRROR ALIGNMENTS ...................................................................................................................... 18
CIRCUIT CHECKS ....................................................................................................................................................... 19
CHAPTER 2 SPECIFIC INFORMATIONS
SETTING & ADJUSTING DATA .................................................................................................................................... 20
LOCATION OF CONTROLS ......................................................................................................................................... 21
ADDING CHANNELS TO THE TV'S MEMORY ............................................................................................................ 23
MECHANICAL DISASSEMBLY .................................................................................................................................... 24
CHASSIS REPLACEMENT PARTS LIST ..................................................................................................................... 26
PC BOARDS BOTTOM VIEW ...................................................................................................................................... 36
TERMINAL VIEW OF TRANSISTORS ......................................................................................................................... 50
CIRCUIT BLOCK DIAGRAM ........................................................................................................................................ 53
SPECIFICATIONS .................................................................................................................................................... END
APPENDIX:
CIRCUIT DIAGRAM
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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 20)
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
µ
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.
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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
R
GB
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
4 Screws
CRT Assembly
S.V.M. Coil
CRT DRIVE Board
Deflection Yoke and Conver Yoke
Lens and Neck Components View
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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
4.
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 15.)
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
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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.
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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 16.)
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 16.)
9. Check whole quality of green line.
10
. Adjust R, B centering magnet so that the cross-bar pat-
tern center comes to screen center.
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LOCATION OF SCREEN AND FOCUS VR’S
R
G
B
SCREEN
COVER
Speaker grille
FOCUS
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REPLACEMENT OF THE CRT
Service parts are provided for each R, G and B. The contents of the parts are as follows.
RG B
46H84/57H84 HOKUTO
51H84 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
or
ANODE CAP
Cut here rubber boot and lead together to detach Lead Holder.
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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
S
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
Press
3) While pressing the MUTE button, press MENU button on TV set.
S
(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
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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 20)
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
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ADJUSTMENT
SPECIFICATION
ELECTRICAL ADJUSTMENT
10500k+0UV
Same spec is ap-
plied on dark area
and bright area.
1
+
-
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
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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
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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.)
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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.
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CONVERGENCE ADJUSTMENT
1. Receive NTSC signal.
2. Enter to the service mode. (See Page 10.)
RCUT 40H
3. Press "7" button to enter the convergence adjusting mode, and the internal net pattern will be displayed. Then, press "9" button to display veritcal stripes.
4. Select the point and the color by pressing following but­tons. (Cursor should be blinking.)
"2", "8", "4", "6" : To select point
"3" : To select color
5. Then press "5" button, and adjust the convergence by pressing following buttons. (Cursor should not be blingking.)
"2", "8", "4", "6" : To adjust convergence
"3" : To select color
6. Repeat from steps 3 to 4 until the convergence and the geometry become fine. (See Page 14.)
7. Press "7" button to memorize the adjusted data.
8. Message of "PLEASE PUSH TOUCH FOCUS" will be dis­played, and press TOUCH FOCUS button which is located on the front panel.
9. TOUCH FOCUS CALIBRATION will start.
10. Soon message of "CALIBRATION FINISHED" will be dis­played, and then a normal picture will be displayed.
11. Then push TOUCH FOCUS button again, and confirm that the convergence does not change.
EXPLANATION OF KEY-FUNCTION IN THE CONVER­GENCE ADJUSTMENT MODE
Load BACK UP DATA: 1 button Up : button Selet Green color: Left : button Blinking of cursor ON/OFF: 5 button Right: Adjust mode ON/OFF: 7 button Down: 8 button Vertical stripe ON/OFF 9 button Erase Green line: 0 button Erase Red line: 100 button Erase Blue line: ENT button
Note: The following message will appear while pressing
"1" button. ENTER: TO LOAD BACKUP DATA MUTE: TO LOAD INITIAL DATA EXIT: TO EXIT
BACKUP DATA sets in factory by performing CALIBRATION. BACKUP DATA updates by per­forming CALIBRATION again. INITIAL DATA uses the seed data on this model. Thus, it cannot updates. INITIAL DATA is not adjusted. There­fore, convergence data operates incorrectly. Nor­mally, BACKUP DATA operates as base data on this model. If BACKUP DATA is incorrectly oper­ated, INITIAL DATA is operated instead of BACK­UP DATA.
2 3
button
4
6
button
Note: If message of "TOUCH FOCUS ERROR" is displayed,
1) Check the connection between four sensors and Convergence Unit.
2) Check the geometry of internal net pattern. (See Page
14.)
If any problem cannnot be found, hardware might have problem.
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