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                   FILE NO. 030-200407




SERVICE MANUAL


Projection Television
                        WH4 Chassis

             43PH46P
             50PH46P




                 Published in Japan, Jun. 2004 (YC)
                                                       TABLE OF CONTENTS
CHAPTER 1 GENERAL ADJUSTMENTS

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

    CRT ASSEMBLY REPLACEMENT AND MOUNTING ............................................................................................. 4
    PICTURE TUBE COMPONENTS ADJUSTMENT .................................................................................................... 6

    SERVICE POSITION ................................................................................................................................................ 9

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

    DESIGN MODE ...................................................................................................................................................... 13
    ELECTRICAL ADJUSTMENT ................................................................................................................................ 14

    CONVERGENCE ADJUSTMENT .......................................................................................................................... 21

    SCREEN AND MIRROR ALIGNMENTS ................................................................................................................ 28

    CIRCUIT CHECKS ................................................................................................................................................. 29

CHAPTER 2 SPECIFIC INFORMATIONS
    SETTING & ADJUSTING DATA .............................................................................................................................. 30
    LOCATION OF CONTROLS ................................................................................................................................... 31

    MECHANICAL DISASSEMBLY .............................................................................................................................. 33
    CHASSIS AND CABINET REPLACEMENT PARTS LIST ...................................................................................... 34
    PC BOARDS BOTTOM VIEW ................................................................................................................................. 52

    TERMINAL VIEW OF TRANSISTORS ................................................................................................................... 62

    CIRCUIT BLOCK DIAGRAM .................................................................................................................................. 64
    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        2. The only source of X-RAY RADIATION in this TV receiver
    X-RAY RADIATION. To avoid such hazards, the high volt-             is the picture tube. For continued X-RAY RADIATION pro-
    age must not be above the specified limit. The nominal value       tection, the replacement tube must be exactly the same
    of the high voltage of this receiver is (A) kV at zero beam        type tube as specified in the parts list.
    current (minimum brightness) under a (C) V AC power source.     3. Some part in this receiver have special safety-related char-
    The high voltage must not, under any circumstances, ex-            acteristics for X-RAY RADIATION protection. For contin-
    ceed (B) kV.                                                       ued safety, parts replacement should be undertaken only
     Refer to table-1 for high voltage (A), (B) & AC voltage (C).      after referring to the PRODUCT SAFETY NOTICE below.
     (See SETTING & ADJUSTING DATA on page 30)
    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 read-
    ing 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.




                                                  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 char-
  acteristics 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-
                    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.




                   R        G   B
                                                          Attention Serviceman
                                                                     The Hex Head
                                                                     Bolts with
                                                                     Springs. (see
                                                                     sketch) used on
8 o'clock                                                            CRT assembly,
                                                                     are "NOT"
                                                        Adjustment Screws
                4 o'clock                               DO NOT LOOSEN-FLUID
                                                        LEAKAGE WILL OCCUR.


                                            4 Screws




Lens Assembly                                                                            4 Screws




CRT Assembly


CRT Anode Cap Assembly




S.V.M. Coil




CRT DRIVE Board                                                      CRT Mounting

                                                       Deflection Yoke and Conver Yoke



                                    Lens and Neck Components View




                                                 -4-
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.                                                                          Anode Cap
 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 An-
    ode Cap as illustrated.
                                                                       Silicon
CAUTION: Align the Anode cable as illustrated on page                  (On shaded area)
         4.                                                            TSE3843W #23960136

ADJUSTING PROCEDURE IN REPLACING CRT
 1. R.G.B. CUTOFF (SCREEN VR) ADJUSTMENT (page 6.)
 2. R.G.B. FOCUS ADJUSTMENT (page 6.)
 3. PICTURE TILT ADJUSTMENT (page 7.)
 4. USER CONVERGENCE CENTER CHECK
    (Refer to owner's manual.)
 5. CENTERING ADJUSTMENT (page 7.)
 6. CONVERGENCE ADJUSTMENT (page 21.)
 7. WHITE BALANCE ADJUSTMENT (page 14.)
 Adjustments are complete.
                                                                                                               2 ~ 5 mm




                                                                        15 ~ 25 mm




                                         SERVICING PRECAUTIONS
      Do not use a magnetized screw driver for screws              When replacing the anode cap assembly (CRT) or
      of Deflection Yoke and Velocity Modulation Coil to           anode lead assembly (F.B.T.), remove the anode
      avoid magnetization of electron gun.                         lead holder from old one and attach the holder
      Magnetization of electron gun will degrade basic             again to new anode lead.
      function and result in unbalance of right and left
      shift of user static convergence, and result in no
      variable quantity.                                                   Check the point of anode lead in a straight
                                                                           line, if it is winding, please revise it.




                           Screw for
                           D.Y                                                       Anode lead holder

                     Screw for SVM coi




                                                            -5-
    WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY RADIATION PRECAUTION", "SAFETY PRE-
    CAUTION" AND "PRODUCT SAFETY NOTICE" ON PAGE 3 OF THIS MANUAL.


                        PICTURE TUBE COMPONENTS ADJUSTMENT
ADJUSTING PROCEDURE IN REPLACING CRT                            RGB FOCUS ADJUSTMENT
        Cutoff                    User convergence center check 1. Call-up the adjustment mode (see page 10)
                                                                 2. Press a button on the remote controller in order to display
                                  Centering (PAL)                   the internally-generated cross-hatch (See TEST SIGNAL
       Lens focus
                                                                    SELECTION on page 11.)
                                  Convergence adjustment         3. Expose only RED by covering the GREEN and BLUE
     Electrical focus
                                  (PAL/NTSC)                        lenses with caps.
                                                                 4. Loosen the RED lens fixing screws (refer to Fig. a), and
        Yoke horizontal            White balance                    adjust the RED lens focus to obtain the sharpest point
                                                                    while observing the middle and peripheral sections of the
                                  Sub bright adjustment             screen.


                                  End

DESCRIPTION OF NECK COMPONENTS

                              1
                          2
                                                                                                     Fig. a

                                                                      5. Use the focus VR of "R" of the focus pack in order to adjust
                                                                         the electric focus in the middle and peripheral sections of
                S.V.M. COIL                                              the screen to its sharpest level.
                                                                      6. Check the RED focus of the whole screen and if necessary
1 Deflection yoke and convergence yoke.
                                                                         repeat steps 4 and 5.
  The position on the neck is required most front (CRT fun-
                                                                      7. Fix the RED lens by tightening its fixing screws.
  nel side) and the screw is fastened after rotating yoke
                                                                      8. Expose only GREEN by covering the RED and BLUE
  adjusting picture tilt.
                                                                         lenses with caps.
2 Centering magnet
                                                                      9. Display the internally-generated cross-hatch signal.
  After adjusting picture tilt, picture position is finally fixed
                                                                     10. Adjust the GREEN lens focus on the left border of the
  by this magnet.
                                                                         screen to its sharpest level, then check the focus on the
  In order to get maximum margin of user convergence con-
                                                                         right border, and if it is at its sharpest level, fix it in that
  trol for center of screen, this magnet have to be used for
                                                                         position by tightening the lens screws.
  center convergence adjustment.

   PREPARATION                                                            (1) If the horizontal line toward the right border is red-
       Operate the receiver for at least 5 minutes.                           flared, turn the lens screw slightly right in order to
                                                                              balance it with the left border. (After adjustment, the
R, G, B CUTOFF (SCREEN VR) ADJUSTMENT                                         left border tends to be slightly green-flared, and the
 1. Adjust before replace the screen assembly.                                right border tends to be slightly red-flared.)
 2. Set user control to reset position.                                   (2) If the horizontal line toward the right border is green-
              CONTRAST  Max                                                   flared, turn the lens screw slightly left in order to
            ( BRIGHTNESS, COLOR, TINT  Center.              )                 balance it with the left border. (After adjustment, the
 3. Call up the adjustment mode display, then select the                      left border tends to be slightly red-flared, and the
    item RCUT.                                                                right border tends to be slightly green-flared.)
 4. Adjust the data of items RCUT, GCUT, and BCUT to
    "40H".                                                           Note: The aim of the above-described adjustment procedure
 5. Press the     button on Remote. (Y-MUTE : ON)
                                                                           for the Green lens focus is to obtain the best lens focus
 6. Gradually rotate R, G and B screen volume of FOCUS
                                                                           after 2 - 3 hours of warming up taking into account the
    PAC clockwise or counterclockwise until the raster
    appears slightly on the CRT through the each lens, and                 focus drift; it applies if the warming up time before the
    leave them.                                                            adjustment is less than 30 minutes. (The horizontal line
    (Lookin to the lens in order to check the raster.)                     in the screen middle section tends to be slightly red-
 7. Press the     button on Remote. (Return to Normal                      flared.)
    Picture)



                                                                    -6-
In case of warming up of more than 2 hours under a condition          Note: Keep in mind that only the BLUE electric focus is ad-
that the large anode current is running through the projection              justed with the black cross-hatch.
tube so that for example the all-white pattern appears, adjust
to obtain the sharpest focus while observing the whole screen         20. Check the BLUE focus of the whole screen and if neces-
like in the RED case.                                                     sary repeat steps 17 and 19.
                                                                      21. Fix the BLUE lens by tightening its fixing screws.
11. Press a button on the remote controller in order to display
    the internally-generated black cross-hatch. (See TEST
    SIGNAL SELECTION on page 11.)                                     TILT ADJUSTMENT
                                                                      Rotate R, G, B deflection yoke so that picture becomes hori-
                                                                      zon, then fasten screw.

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




12. Use the focus VR of "G" of the focus pack in order to ad-
    just the electric focus in the middle section of the screen
    to its sharpest level.

Note: Normally the most clearly visible point of the scanning
                                                                      2.   Select the adjustment mode. (See page 10.)
      line is the sharpest point of the Green focus, however as
                                                                      3.   Press a button on the Remote Control to display the black
      the characteristics vary depending on the projection tube,
                                                                           cross-hatch.
      the sharpest focus points of the vertical and horizontal
      lines may not match each other, thus when you turn the
      focus VR, if the picture tends to be tremendously unstable
      (rolls horizontally or vertically), adjust the balance of the
      vertical and horizontal lines to its best position.

13. Check the GREEN focus of the whole screen and if
    necessary repeat steps 10 and 11.
14. Fix the GREEN lens by tightening up its fixing screws.
15. Expose only BLUE by covering the RED and GREEN
    lenses with caps.
16. Press a button on the remote controller in order to display
    the internally-generated cross-hatch (See TEST SIGNAL
    SELECTION on page 11.)
17. Loosen the BLUE lens fixing screws (refer to Fig. a), and         4.   Adjust G centering magnet so that the cross-hatch pat-
    adjust the BLUE lens focus while observing the middle                  tern center comes to screen center.
    and peripheral screen sections.                                   5.   Perform HEIGHT adjustment . (See page 14.)
18. Press a button on the remote controller in order to display       6.   Perform WIDTH adjustment. (See page 14.)
    the internally-generated black cross-hatch (See TEST SIG-         7.   Check whole quality of green line.
    NAL SELECTION on page 11.)                                        8.   Adjust R, B centering magnet so that the cross-hatch pat-
19. Use the focus VR of "B" of the focus pack in order to adjust           tern center comes to screen center.
    the focus in the middle section of the screen to its sharpest
    level.
    (The point of the Blue focus becomes sharpest when the
    brightness level of BLUE is lowest, the cross-hatch is
    clearly visible.)




                                                               -7-
LOCATION OF SCREEN AND FOCUS VR'S
To remove the Speaker grille and Front panel.




                                                                    R G B




                                                                                       SCREEN VR's

                                                                                       FOCUS VR's

          Speaker grille




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

                                                     NOTE : THE LEAD HOLDER IS ATTACHED TO
                RUBBER BOOT                                 TPA5011AH (Z450), BUT IS NOT ATTACHED
                                                            TO ANODE LEAD AND ANODE CAP.
                                                            RUBBER BOOT IS ATTACHED TO ANODE
              LEAD HOLDER                                   AND LEAD ANODE CAP.

                                                     2. Detaching Lead Holder
                                                                                                  OLD
                                                                              RUBBER BOOT         ANODE LEAD
                                                                                                      or
                                                                                                  ANODE CAP




                   Fig. a                                  LOCK      LEAD HOLDER          Cut here rubber boot
                                                                                          and lead together to
                                    Z450 TPA5007                                          detach Lead Holder.
                                                                              Fig. b




                                                   -8-
 WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY RADIATION PRECAUTION", "SAFETY PRE-
 CAUTION" AND "PRODUCT SAFETY NOTICE" ON PAGE 3 OF THIS MANUAL.



                                               SERVICE POSITION
In order to assure the performance, processed wires shall be replaced after the repair work.
Work procedures are as follows:
1. Remove the back board.
2. Remove lead wires.
3. Draw out the chassis.
4. Rest the chassis against the back cabinet, chassis as shown bellow.

After repair work finished, replace it in the opposite procedure.




                                                            -9-
                                               SERVICE MODE

1. ENTERING TO SERVICE MODE
   1) Press o button once on                 2) Press o button again to         3) While pressing the o button,
      Remote Control.                           keep pressing.                     press MENU button on TV set.

                                                                                            Item              S
                                                                                            Data


          or Sound Mute

                                                                                           (Service mode display)


2. DISPLAYING THE ADJUSTMENT MENU
   1)  Press MENU button on TV.
           Service mode                          Adjustment mode

                                                                            Item
                     S             Press                                    Data

                                   Press




3. KEY FUNCTION IN THE SERVICE MODE
   The following key entry during display of adjustment menu provides special functions.

   Screen adjustment mode ON/OFF:            -/-- ( ) button (on Remote)
   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 ; +/



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