Mitsubishi Electric WS-55859 User manual

CAUTION:
Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTI NS" and
"PR DUCT SAFETY N TICE" contained in this manual.
 Weight and dimensions shown are approximate.
 Design specifications are subject to change without notice.
MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
9351 Jeronimo Road, Irvine, CA 92618-1904
Copyright © 2001 Mitsubishi Digital Electronics America, Inc.
All Rights Reserved
MITSUBISHI ELECTRIC
Service
Manual

PROJECTION TELEVISION
V19 / V19+ CHASSIS
SPECIFICATIONS
 Pow r Input : AC 120V, 60Hz
Pow r Usag : 300W
 Fr qu ncy : VHF 54 ~ 470MHz
Rang UHF 470 ~ 806MHz
Ant nna Input : VHF/UHF 75Ω unbalanced
2 - NTSC
1 - ATV/QAM
CRT Siz : [7 inches]
: [9 inches] WS-73909 only
High Voltag : 32.0kV (at 0A)
Sp ak r : [WS-55859]]
5" round type, full range 2 pcs. (8Ω 10W)
: [WS-65869]
6" round type, full range 2 pcs. (8Ω 10W)
: [WS-55909 / WS-65909 / WS-739090]
5" round type, full range 2 pcs. (8Ω 10W)
2" round type, tweeter 2 pcs. (8Ω 10W)
W ight : [WS-55859 250 lbs
: [WS-55909] 256 lbs
: [WS-65869] 326 lbs
: [WS-65909] 348 lbs
: [WS-73909] 405 lbs
Cabin t : [Model] (H)x(W)x(D)
Dim nsions : [WS-55859] 50.3"x50.6"x27.8"
: [WS-55909] 51.4"x46.9"x28.1"
: [WS-65869] 61.9"x59"x28.1"
: [WS-65909] 61.5"x58.2"x28.3"
: [WS-73909] 65.7"x65.2"x29.8"
 Input L v l : VIDE IN JACK (RCA Type)
1.0Vp-p 75Ω unbalanced
: AUDI IN JACK (RCA Type)
-4.7dBm 43kΩ unbalanced
: S-VIDE IN JACK
(Y/C separate type)
Y:1.0 Vp-p C:0.286Vp-p(BURST)
75Ω unbalanced
: C MP / Y, Cr, Cb (RCA Type)
Y: 1.0 Vp-p Cr, Cb: 700mVp-p
: ATV / Y(G), Pr(R), Pb(B), H, V
Y: 1.0Vp-p with sync 75Ω (BNC)
Pr, Pb: 700mV 75Ω
H, V: 3.0Vp-p 75Ω
:VGA / R,G,B,V,H (15 pin D)
 Output L v l : VIDE UT JACK (RCA Type)
1.0Vp-p 75Ω unbalanced
: AUDI UT JACK (RCA Type)
-4.7dBm 4.7kΩ unbalanced
 Digital Int rfac
: IEEE-1394 I/ Jacks
:AC-3 Digtal Audio utput
V19
MODELS
WS-55859
WS-65869
V19+
MODELS
WS-55909
WS-65909
WS-73909
WS-65869

MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
Pag 3
INTRODUCTION ................................................................................................................................5
PRODUCT SAFETY NOTICE ............................................................................................................. 5
SAFETY PRECAUTIONS ................................................................................................................... 6
DISASSEMBLY
Cabin t Disass mbly (Front Vi w) .............................................................................................. 7
WS-55859.............................................................................................................................. 7
WS-65869.............................................................................................................................. 8
WS-55909 / WS-65909 / WS-73909 ...................................................................................... 9
Cabin t Disass mbly (R ar Vi w) ............................................................................................. 10
WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909 ............................................. 10
SERVICING THE LENTICULAR SCREEN AND FRESNEL LENS
L nticular Scr n and Fr sn l L ns R moval......................................................................... 11
WS-55859............................................................................................................................ 11
WS-55909 / WS-65869 / WS-65909 / WS-73909 ................................................................. 12
L nticular Scr n and Fr sn l L ns Installation .................................................................... 13
SERVICING THE DIAMONDSHIELDSTM r
DiamondShield TM Removal & Installation ...................................................................................... 14
SERVICING PCBs
Chassis Removal .......................................................................................................................... 15
PCB Locations.............................................................................................................................. 16
Main Components Location ........................................................................................................... 16
DM Module Main Components Location ........................................................................................ 17
CRT REPLACEMENT
CRT Removal ................................................................................................................................18
CRT Installation ............................................................................................................................ 19
ELECTRICAL ADJUSTMENTS
Test Equipment ............................................................................................................................. 21
Initial Setup ................................................................................................................................... 22
LED Indicator Diagnostics ............................................................................................................. 23
Remote Control perational Mode ................................................................................................ 23
Circuit Adjustment Mode............................................................................................................... 24
n Screen Display Position Mode ................................................................................................ 25
Convergence Adjustment Mode ..................................................................................................... 25
E2PR M Replacement ................................................................................................................. 27
Adjustment Items List ................................................................................................................... 27
Adjustment Test Points ................................................................................................................. 30
Adjustment Procedures ................................................................................................................ 31
Audio Circuit ........................................................................................................................ 31
High Voltage Regulation ....................................................................................................... 32
Main/Sub Y Level ................................................................................................................. 32
Side by Side Sub Picture Tint .............................................................................................. 33
Side by Side Sub Picture Color ............................................................................................ 33
CRT Cutoff ........................................................................................................................... 34
White Balance (NTSC) ......................................................................................................... 34
White Balance (HD) ............................................................................................................. 35
Cb, Cr ffset ........................................................................................................................ 35
CONTENTS

MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
Pag 4
Black Level .......................................................................................................................... 36
Sub Contrast ....................................................................................................................... 36
Dynamic Focus Preset ........................................................................................................ 37
Lens Focus .......................................................................................................................... 37
Electrostatic Focus & Alignment Magnet Adjustment .......................................................... 38
n Screen Display Character Position ................................................................................. 38
Deflection/Convergence Geometry Presets .......................................................................... 39
Deflection Circuit Geometry Adjustments ............................................................................. 40
Convergence Circuit Geometry Adjustments ........................................................................ 41
Centering and Static Convergence ....................................................................................... 42
Coarse Convergence Adjustments ....................................................................................... 43
Fine Convergence Adjustments ............................................................................................ 44
CHIP PARTS REPLACEMENT ......................................................................................................... 45
REPLACEMENT PARTS
Parts rdering .............................................................................................................................. 46
Critical and Warranty Parts Designation........................................................................................ 46
Parts Tolerance Codes .................................................................................................................. 46
Quick Reference List .................................................................................................................... 47
Service Parts List .......................................................................................................................... 48
Screen Parts List .......................................................................................................................... 59
CIRCUITRY BLOCK DIAGRAMS
Standby Supplies Regulator .......................................................................................................... 61
Switched Supplies Regulator ........................................................................................................ 62
DM Power Supply ......................................................................................................................... 63
Video / Color A/V Switch Circuit ................................................................................................... 64
Video / Color Signal Path .............................................................................................................. 65
Sync Signal Path .......................................................................................................................... 66
Deflection / HV.............................................................................................................................. 67
X-Ray Protect ............................................................................................................................... 67
Sound Circuit ................................................................................................................................68
Convergence ................................................................................................................................. 69
Control Circuitry ............................................................................................................................ 70
S ction 2 .... Sch matic Diagrams
SCHEMATIC DIAGRAMS
verall Block Diagram ................................................................................................................... 1
PCB-MAIN ..................................................................................................................................... 2
PCB-P WER................................................................................................................................. 3
PCB-TERMINAL ............................................................................................................................ 4
PCB-SIGNAL-1 (MICR )................................................................................................................. 5
PCB-SIGNAL-2 (AV I/ ) .................................................................................................................. 6
PCB-SIGNAL-3 (VIDE / CHR MA) ............................................................................................... 7
PCB-3DYC ..................................................................................................................................... 8
PCBs-C NV GEN / JUNGLE..........................................................................................................9
PCBs - CRT / C NTR L / SVM / DBF / DM P WER .................................................................. 10
PCB-2HDW-1 ............................................................................................................................... 11
PCB-2HDW-2) .............................................................................................................................. 12
PCB-2HDW-3 ............................................................................................................................... 13
PCB LAYOUT DIAGRAMS ............................................................................................................... 14

Pag 5
MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
INTRODUCTION
This service manual provides service instructions for PTV Models WS-55859 and WS-65869 which use the V19
chassis, and PTV Models WS-55909, WS-65909 and WS-73909 which use the V19+ chassis. Service personnel
should read this manual thoroughly before servicing these chassis.
This service manual includes:
1. Assembly and disassembly instructions for the front and rear cabinet components.
2. Servicing of the Lenticular Screen and Fresnel Lens.
3. Servicing printed circuit boards (PCBs).
4. CRT replacement procedure.
5. Electrical adjustments.
6. Chip parts replacement procedures.
7. Circuit path diagrams.
The parts list section of this service manual includes:
1. Cabinet and screen parts.
2. Electrical parts.
Schematic and block diagrams of the above listed models are included in this service manual for better under-
standing of the circuitry. PCB drawings are also included for easy location of parts and test points.
PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in television receivers have special safety related characteristics. These
characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be
obtained by using replacement components rated for higher voltage, wattage, etc.
Replacement parts which have special safety characteristics are identified in this service manual.
Electrical components having such features are identified by shading on the schematic diagram and by bold
typ in the parts list of this service manual. Th r plac m nt for any saf ty part should b id ntical in valu
and charact ristics.

Pag 6
MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
SAFETY PRECAUTIONS
NOTICE: bserve all cautions and safety related notes located inside the receiver cabinet and on the
receiver chassis.
WARNING:
1. peration of this receiver outside the cabinet or with the cover removed presents a shock hazard
from the receiver's power supplies. Work on the receiver should not be attempted by anyone who is
not thoroughly familiar with the precautions necessary when working on high voltage equipment.
2. Do not install, remove or handle the picture tubes in any manner unless shatterproof goggles are
worn. People not so equipped should be kept away while the picture tube is being handled. Keep
the picture tube away from the body while handling.
3. When service is required, observe the original lead dress. Extra precaution should be taken to
assure correct lead dress in the high voltage area. Where a short-circuit has occurred, replace those
components that indicate evidence of overheating.
X-Radiation warning
The surface of the cathode ray tubes (CRTs) may generate X-Radiation, so take proper precautions when servic-
ing. It is recommended that a lead apron be used for shielding while handling the CRT. Use this method if
possible.
When replacing the CRTs, use only the designated replacement part since it is a critical component with regard to
X-Radiation. High voltage must be set as prescribed under the section titled Electrical Adjustments.
L akag curr nt ch ck
Before returning the receiver to the customer, it is recommended that leakage current be measured according to
the following methods.
1. Cold Check
With the alternating current (AC) plug removed from the AC source, place a jumper across the two AC plug
prongs. Connect one lead of an ohm meter to the AC plug and touch the other lead to each exposed metal
part (i.e. antennas, handle bracket, metal cabinet, screw heads, metal overlay, control shafts, etc.), particu-
larly any exposed metal part that has a return path to the chassis. The resistance of the exposed metal parts
having a return path to the chassis should b a minimum of 1M ga Ohm. Any resistance below this value
indicates an abnormal condition and requires corrective action.
2. Hot Check ...Use the circuit shown below to perform the hot check test.
1. Keep switch S1 open and connect the receiver to the measuring circuit. Immediately after
connection, and with the switching devices of the receiver in their operating positions, measure
the leakage current for both positions of switch S2.
2. Close switch S1, energizing the receiver. Immediately after closing switch S1, and with the
switching devices of the receiver in their operating positions, measure the leakage current for both
positions of switch S2. Repeat the current measurements of items 1 and 2 after the receiver has
reached thermal stabilization. Th l akag curr nt must not xc d 0.5 milliamp r (mA).

Pag 7
MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
CABINET DISASSEMBLY (FRONT VIEW)
WS-55859
*R f r to th Parts List for Part Numb rs
1a. Front Cabinet Disassembly
1. Remove the Speaker Grille by pulling forward.
2. Remove the Board Front by removing 4 screws (a).
3. Remove the 4 screws (b) holding the Screen Assembly.
4. Lift the Screen Assembly up and away from the cabinet.

Pag 8
MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
CABINET DISASSEMBLY (FRONT VIEW)
WS-65869
*R f r to th Parts List for Part Numb rs
1b. Front Cabinet Disassembly
1. Remove the Speaker Grille by pulling forward.
2. Remove the Board Front by removing screws (b)
3. Remove the Control Panel by removing two screws (a).
4. Remove the four screws (b) holding the Screen Assembly.
5. Lift the Screen Assembly up and away from the cabinet.

Pag 9
MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
CABINET DISASSEMBLY (FRONT VIEW)
WS-55909 / WS-65909 / WS-73909
*R f r to th Parts List for Part Numb rs
1c. Front Cabinet Disassembly
1. Remove the Speaker Grille by pulling forward.
2. Remove 2 screws (a) to remove the Control Panel.
3. Remove the Board Front by removing 4 screws (b).
4. Remove the 4 screws (c) holding the Screen Assembly.
5. Lift the Screen Assembly up and away from the cabinet.

Pag 10
MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
CABINET DISASSEMBLY (REAR VIEW)
WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
*R f r to th Parts List for Part Numb rs
2b. Rear Cabinet Disassembly
1. Remove screws (a) holding the Back Board.
2. Remove the 4 screws (b) holding each Board Shelf.
3. Remove the 4 screws (c) securing the Light Box Assembly.
4. Slide the Light Box out the rear of the Cabinet.

Pag 11
MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
SERVICING THE LENTICULAR SCREEN AND FRESNEL LENS
CAUTION: W ar glov s when handling the Lenticular Screen and Fresnel Lens.
This prevents cuts and finger prints. Do not plac Fr sn l L ns in th sun.
This may cause fire and heat related injuries.
WS-55859
1a. L nticular Scr n and Fr sn l L ns R moval
1. Remove the screen assembly shown in the Cabinet Disassembly procedure.
2. Remove the screws (a) securing the Screen Holder.
3. Slide the Lenticular Screen and Fresnel Lens from the Screen Frame.
Not : When separating the Lenticular Screen from the Fresnel Lens, use caution
while prying the Screen and Lens apart. Use a slot type screw drive, and
remove the pressure sensitive double sided tape.

Pag 12
MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
SERVICING THE LENTICULAR SCREEN AND FRESNEL LENS
CAUTION: W ar glov s when handling the Lenticular Screen and Fresnel Lens.
This prevents cuts and finger prints. Do not plac Fr sn l L ns in th sun.
This may cause fire and heat related injuries.
WS-55909 / WS-65869 / WS-65909 / WS-73909
1b. L nticular Scr n and Fr sn l L ns R moval
1. Remove the screen assembly shown in the Cabinet Disassembly procedure.
2. Remove the Screen Frame top section by removing 4 screws (a).
3. Carefully grasp the Lenticular Screen and Fresnel Lens combination and pull upward and out
of the Screen Frame Assembly.
Not : When separating the Lenticular Screen from the Fresnel Lens, use caution
while prying the Screen and Lens apart. Use a slot type screw drive, and
remove the pressure sensitive double sided tape.

Pag 13
MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
SERVICING THE LENTICULAR SCREEN AND FRESNEL LENS
2. L nticular Scr n and Fr sn l L ns Installation.
Not : Store the Lenticular Screen and Fresnel Lens in a cool dry place. High humidity may
deform the Lenticular Screen and Fresnel Lens.
1. Apply double coated tape (Part # LENS-TAPE) along the top front edge of the Fresnel Lens
as shown below. Refer to the Table below for proper tape length.
2. Place the Fresnel Lens on top of the Lenticular Screen and apply pressure at the top edge
to bond them together as shown below.
Mod l Scr n
Siz
Tap
L ngth
WS-55859 55" 47.8"
WS-55909 55" 47.8"
WS-65869 65" 56.5"
WS-65909 65" 56.5"
WS-73909 73" 63.5"

Pag 14
MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
SERVICING THE DIAMONDSHIELD
1. DiamondShi ld R moval Proc dur
The location of the DiamondShieldTM molding clips varies between models, top and bottom, or sides. Use
the appropriate disassembly procedure given below.
Not : Wear gloves when handling the DiamondShield to prevent finger prints.
1. Gently insert a small screwdriver between the
DiamondShield and one end of the clip to
pry the clip loose.
2. Remove both clips by pulling them toward you.
3. Carefully insert a small screwdriver into the
gap at the top/center point of the Shield and
pull the Shield slightly away from the unit.
Place your hands at the points shown and
gently bow the Shield toward you and remove
from the unit. Then re-install the two clips.
Top & Bottom Molding Clips Sid Molding Clips
1. Gently insert a small screwdriver between the
DiamondShield and one end of the clip to
pry the clip loose.
2. Remove both clips by pulling them toward you.
3. Carefully insert a small screwdriver into the
gap at the side/center point of the Shield and
pull the Shield slightly away from the unit.
Place your hands at the points shown and
gently bow the Shield toward you and remove
from the unit. Then re-install the two clips.
2. DiamondShi ld Installation Proc dur
*(See the Parts List for DiamondShield part numbers)
To install the DiamondShieldTM, reverse the above Removal Procedure.

Pag 15
MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
Main Chassis R moval
Chassis and DM Modul R moval
The chassis and DM Module can be removed as a single unit.
1. Undo the cable wire ties to the Front Panel, Speakers, CRTs, etc.
2. Remove 3 screws (a) securing the Main Chassis.
3. Unlatch the two chassis locks on the front of the chassis.
4. Slide the Chassis and DM Module out the rear of the unit.
5. Tilt upward to access the bottom of the main chassis.
NOTE: If the chassis cannot be removed with the DM Module, due to insufficient cable length:
1. Perform Step 1 through 3 above.
2. Remove 3 screws (b).
3. Slide the chassis only out the rear of the unit.

Pag 16
MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
PCB Locations
Main Compon nts Location

Pag 17
MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
DM
POWER
SUPPLY
ATV
TUNER
DE-
MODULATOR
E2P
MODULE
FLASH CARD SLOT
COVER
DM Modul Main Compon nts Location

Pag 18
MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
CRT REPLACEMENT
1. R moval of th CRT
Caution! High voltage should be completely discharged prior to CRT removal.
Since The CRTs receive high voltage from the HV Block, discharge
by shorting the open end of the respective high voltage cable to
chassis ground.
Not : Refer to the Cabinet Disassembly Procedures when performing steps 1 through 4.
1. Remove the Speaker Grille, Front Board, and Screen Assy.
2. Remove the Back Board.
3. Remove the Anode Lead Wire from the CR Block.
4. Remove the PCB-CRT.
5. Remove 4 hex-screws "a" retaining the ptical Unit. [Figure 5-1]
6. Remove 4 screws "b" retaining the Lens.
Not : DO NOT loos n th RED scr ws. Doing so will break the seal between the
C-Element and the # 6 Lens, causing leakage of the CRT Coolant.
7. Remove 4 screws "c" retaining the CRT. [Figure 5-2]
8. Remove the Deflection Yoke from the neck of the CRT. [Figure 5-7]
Figur 5-2
Figur 5-1
Not : The 4 spring-loaded screws shown
in Fig 5-2 and labeled as "D N T
REM VE", should not be loosened
under any circumstance. Doing so
will break the seal between the
CRT and the CRT-Spacer, causing
leakage of the CRT Coolant.

Pag 19
MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
2. Installation of th CRT
Not : The replacement CRT is supplied as an assembly comprised of the CRT and the
Inner Lens with the space between them filled with ethylene glycol. Care should
be taken during handling and installation to prevent shock from disrupting the seal
or alignment between the CRT and Inner Lens. [Figure 5-3]
Not : The CRT fixing screws should not be loosened nor should they be removed. [Figure 5-4]
1. Carefully position the replacement CRT and fasten in place using 4 screws "d". [Figure 5-6]
Figur 5-6
Figur 5-5
Figur 5-4
Figur 5-3

Pag 20
MODELS: WS-55859 / WS-55909 / WS-65869 / WS-65909 / WS-73909
2. Install the Deflection Yoke on the CRT neck. [Figure 5-7]
3. Install the Lens that was removed in steps 8 and 9 of Removal f The CRT. [ Figures 5-1 and 5-2 ]
a) Position the Lens so that the Label faces the direction shown in Figure 5-8.
b) Install the mounting screws. [Figure 5-1]
4. Connect the PCB-CRT.
5. Insert the ptical Unit into the Light Box Assembly.
6. Insert the Anode Lead Wire into the Flyback Transformer.
7. Re-clamp the Lead Wire in its original position.
Adjustm nt proc dur s aft r r placing th CRT(s)
 CRT Cut ff / White Balance Adjustment
 Static Convergence Adjustment
 Dynamic Convergence Adjustment
Figur 5-7
Figur 5-8