Mitsubishi Electric WD-52526 User manual

• Design specifications are subject to change without notice.
MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
9351JeronimoRoad,Irvine,CA 92618-1904
Copyright © 2006 Mitsubishi Digital ElectronicsAmerica, Inc.
AllRightsReserved
CAUTION:
Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and
"PRODUCTSAFETYNOTICE" containedinthis manual.
SerSer
SerSer
Servicevice
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ManualManual
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Manual
20062006
20062006
2006
MITSUBISHIELECTRIC
LCDPROJECTIONHDTV
V28L CHASSIS
SPECIFICATIONS
• Power Input : AC 120V, 60Hz
•Power Usage : 295W
• LightEngine : 3 LCD (1280 x 720 pixels)
• Light Source : 110W
• Channel Range : Air VHF - 2~13, UHF - 14~69
Analog Cable - 1~125
Digital Cable - 1~135
•Antenna Input : RF 75Ω unbalanced
• Tuning : 1NTSC/ATSC/QAM
• Cabinet Dimensions : [WD-52526]
34"(H) x 49.6"(w) x 17.8"(D)
: [WD-62526]
40.5"(H) x 58.3"(W) x 19.9"(D)
• Weight : [WD-52526]
110 lbs
: [WD-62526]
133 lbs
•Speakers (8 Ohms 10W)
: 2-5 ½ x 2 ¼ inch
• Input Level : VIDEOINJACK(RCAType)
1.0Vp-p 75W unbalanced
: AUDIOIN JACK(RCAType)
-4.7dBm 43kW unbalanced
: S-VIDEOIN JACK
(Y/C separate type)
Y:1.0 Vp-p C:0.286Vp-p(BURST)
75W unbalanced
: COMP/Y,Cr,Cb (RCAType)
Y: 1.0 Vp-p Cr, Cb: 700mVp-p
• Output Level : VIDEOOUTJACK (RCAType)
1.0Vp-p 75W unbalanced
: AUDIOOUT JACK (RCAType)
-4.7dBm 4.7kW unbalanced
• Digital : AC-3 Digital Audio Output
(RCAType)
: HDMITM
: Lead-Free solder PWBs
.
WD-52327 V28L Chassis
WD-52526
WD-62526
WD-52526
Pb Solder
Pb Solder
WD-52327
WD-52526

MODEL: WD-52526 / WD-62526
Page 3
INTRODUCTION ................................................................................................................................5
PRODUCT SAFETY NOTICE ...........................................................................................................5
SAFETY PRECAUTIONS .................................................................................................................6
DISASSEMBLY .................................................................................................................................7
FrontCabinetComponents .............................................................................................................7
ChassisRemoval ............................................................................................................................8
Chassis Disassembly / Accessing PWBs..................................................................................... 12
LightEngineReplacement ............................................................................................................ 17
SERVICINGTHE LENTICULAR LENS AND FRESNEL SCREEN..................................................... 22
Removalofthe LenticularScreen and FresnelLens ...................................................................... 22
Installationof the Lenticular Screen and Fresnel Lens................................................................... 24
ADJUSTMENTS ...............................................................................................................................25
Option Menu& Defaults ................................................................................................................ 25
LEDIndicator Diagnostics............................................................................................................. 26
ErrorCodesOperationalCheck..................................................................................................... 27
ServiceAdjustmentMode .................................................................................................... 28
ServiceAdjustmentModeOperation .................................................................................... 28
Transferringdata .................................................................................................................. 29
LightEngineAdjustment ............................................................................................................... 30
TestSignal activation ........................................................................................................... 30
Preliminary .......................................................................................................................... 30
TrapezodialDistortionAdjustment ........................................................................................ 31
RotationAdjustment.............................................................................................................31
Hortizontal & Vertical Position.............................................................................................. 32
TROUBLESHOOTING ...................................................................................................................... 33
MICRO/ TERMINAL PWBs ................................................................................................. 33
POWER-PWB ..................................................................................................................... 33
OPTICALENGINE ............................................................................................................... 34
Protect Lines ....................................................................................................................... 35
USINGLEAD FREE SOLDER .......................................................................................................... 36
CHIPPARTSREPLACEMENT ......................................................................................................... 37
REPLACEMENTPARTS .................................................................................................................. 38
PartsOrdering .............................................................................................................................. 38
Criticaland WarrantyParts Designation........................................................................................38
PartsToleranceCodes.................................................................................................................. 38
QuickReference List .................................................................................................................... 39
SERVICE PARTS LIST .................................................................................................................... 40
SCREENASSEMBLY PARTSLIST.................................................................................................. 48
CIRCUITRYBLOCK DIAGRAMS ..................................................................................................... 49
MainPower Supply ....................................................................................................................... 49
Lamp Ballast DC Supply............................................................................................................... 50
FansPower Supply....................................................................................................................... 50
CONTENTS

MODEL: WD-52526 / WD-62526
Page 4
PowerDistribution......................................................................................................................... 51
AnalogVideo Signal Path ............................................................................................................. 52
Digital Video Signal Path .............................................................................................................. 53
SoundSignal Path ........................................................................................................................ 54
CommandInputCircuitry............................................................................................................... 55
SerialData Control Lines .............................................................................................................. 55
LampControlCircuitry .................................................................................................................. 56
ShutterControl.............................................................................................................................. 56
Lamp, Engine and Fan’s Protect circuitry ..................................................................................... 57
SCHEMATICDIAGRAMS .....................................................................................................................

MODEL: WD-52526 / WD-62526
Page 5
INTRODUCTION
Thisservice manualprovides service instructions for LCD Projection TV ModelsWD-52526 and WD-62526, using
chassis V28L.
Thisservice manualincludes:
1. Assembly and disassembly instructions for the front and rear cabinet components.
2. Servicingof the Lenticular Screenand FresnelLens.
3. Servicing down to major components, chassis, PWBs, Light Engine, Lamp Ballast, etc..
4. Adjustments.
5. LeadFree Soldering.
6. Chippartsreplacement procedures.
7. Simplified circuit path diagrams.
The parts list section of this service manual includes:
1. Cabinetand screen parts.
2. Electrical parts.
Block diagrams of the above listed models are included in this service manual for better understanding of the circuitry.
PRODUCT SAFETY NOTICE
Manyelectrical and mechanical parts in television receivers have special safety related characteristics. These charac-
teristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by
usingreplacement componentsrated for higher voltage, wattage, etc.
Replacementparts 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 type in
the parts list of this service manual. Therefore, the replacement for any safety part should be identical in value
and characteristics.
Pb Solder
The PWBs used in the V28L chassis are constructed using Lead-Free solder. When servicing
use only recommended Lead-Free solder (refer to page 36).
HDMIis a trademark of HDMI Licensing, LLC.

Page 6
MODEL: WD-52526 / WD-62526
SAFETY PRECAUTIONS
NOTICE: Observe all cautions and safety related notes located inside the receiver cabinet and on the
receiverchassis.
WARNING:
1. Operationof this receiver outside the cabinetor withthe coverremoved presentsa shock hazard
fromthe receiver's power supplies. Work onthe receiver should not beattempted by anyone who is
notthoroughly familiar withthe precautionsnecessary when workingon highvoltage equipment.
2. Whenservice is required, observe theoriginal leaddress. Extraprecaution shouldbe taken to
assure correct lead dress in the high voltage area. Where a short-circuit has occurred, replace those
componentsthatindicateevidence of overheating.
Leakage current check
Before returning the receiver to the customer, it is recommended that leakage current be measured according to the
followingmethods.
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.), particularly 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 be a minimum of 1Meg Ohm. Any resistance below this value indicates an
abnormalconditionand requires correctiveaction.
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 devicesof thereceiver intheir operatingpositions, measurethe leakagecurrent for both
positions of switch S2. Repeat the current measurements of items 1 and 2 after the receiver has
reached thermal stabilization. The leakage current must not exceed 0.5 milliampere (mA).
WARNING ... RISK OF EYE INJURY
Do not look into the light source, lens or mirror when operating the TV

MODEL: WD-52526 / WD-62526
Page 7
SPEAKER GRILLE Removal
Pullthe SPEAKER-GRILLE away from the cabinet to remove.
SCREEN-ASSY Removal
1) Remove 10 screws (a) from the upper cabinet rear cover (3 screws on each side and 4 screws across the
top).
2) Remove screws (b) along the bottom of the SCREEN-ASSY (8 screws on 52 inch models, and 12 screws
on 62 inch models),
3) Unplugthe LLconnector to the front CONTROL-PANEL.
4) Lift the SCREEN-ASSY up slightly and then pull away from the cabinet.
CABINET FRONT DISASSEMBLY

Page 8
MODEL: WD-52526 / WD-62526
BACK-COVER Removal
1) Remove9 screws (a)
2) Remove13 screws (b)
3) Pull the COVER-BACK from the cabinet.
CHASSIS REMOVAL
Metal Support Plate Removal
Remove4 screws (a) to remove the metal support plate,
(a)

MODEL: WD-52526 / WD-62526
Page 9
Chassis Mounting Screws Removal
Remove the two chassis mounting screws (b).
(b)
(b)
Release Cable Clamps & Disconnect CE Connector
Cable
Clamp Cable
Clamp
Cable
Clamp CE
Connector

Page 10
MODEL: WD-52526 / WD-62526
On the right side of the chassis (from the rear):
1) ReleasetheAC Cord from it’smounting.
2) Unplug ES1 connector to the speakers.
Chassis removal from the Cabinet
Carefully rotate the chassis clockwise to slide it from the cabinet.
AC Cord ES1 Connector

MODEL: WD-52526 / WD-62526
Page 11
Complete Chassis Removal
Tocompletely removethe chassisfrom thecabinet, the folowing connectors must be unplugged.
• PL plug to the Ballast (on the left side of the chassis).
• KA plug from the PWB-RISER (right side of chassis).
• FB, FC and J8F01 at the PWB-FORMAT(right side of chassis).
PL
KA J8F01
FB
FC

Page 12
MODEL: WD-525276 / WD-62526
Chassis Disassembly / Accessing PWBs
Note: Although not individually indicated, unplug the required connectors in each
disassemblystep.
REMOVE
Chassis Top Cover
(Fig. 1)
REMOVE
PWB-POWER
(Fig. 3)
REMOVE
Assy PWB-TERMINAL
(Fig. 2)
REMOVE
Chassis Top Shield
(Fig. 3)
REMOVE
Chassis Rear Shield
(Fig. 4)
REMOVE
PWBs MICRO / FMT/ RISER
(Figs. 5 & 6)
REMOVE
PWB-DM
(Fig. 7)
Chassis Sequence of Disassembly

MODEL: WD-525276 / WD-62526
Page 13
Assy PWB- TERMINAL Removal (Figure 2)
1) Remove7 screws (a)to remove
theTERMINAL-INLAY.
2) Remove3 screws (b)to remove
theAssyPWB-TERMINAL.
Figure1:ChassisCoverRemoval
Chassis Cover Removal (Figure 1)
1) Removethe 4 screws (a).
2) Lift the Cover from the chassis.
Figure 2: ASSY PWB-TERMINAL Removal

Page 14
MODEL: WD-525276 / WD-62526
PWB-POWER Removal (Figure 3)
1) Removefourscrews (b).
2) Disconnect all connectors to PWB-POWER.
3) Lift PWB-POWER from the chassis.
Figure 3: PWB-POWER and Chassis Upper Shield
Chassis Upper Shield Removal (Figure 3)
1) Removesevenscrews (c).
2) Lift the Shield from the chassis.

MODEL: WD-525276 / WD-62526
Page 15
Figure 4: Chassis Rear Shield Removal
Chassis Rear Shield Removal (Figure 4)
1) Removesevenscrews (c).
2) Removenut(c1).
3) Pull off Chassis Rear Shield.
PWB-MICRO Removal
Referring to Figure 5.
1) Removethree screws (d).
2) UnplugPWB-MICRO from PWB-RISER
andremove from the chassis.
Figure 5: PWB-MICRO Mounting Screws

Page 16
MODEL: WD-525276 / WD-62526
Figure 6: PWBs RISER and FORMAT Removal
Figure 7: PWB-DM Removal
PWB-DM Removal (Figure 7)
1) Removethree screws (g) holding the PWB-
MICROSupport Bracket.
2) Removethe Support Bracket.
3) Removethe five screws(h).
4) Remove the PWB-DM from the chassis.
PWB-RISER and PWB-FORMAT Removal
Referring to Figure 6.
1) Removeone screw (e).
2) Unplug and remove PWBs RISER
andFORMAT.

MODEL: WD-525276 / WD-62526
Page 17
Light Engine Replacement
Light Engine and Associated Components
The exploded view below shows the the Light Engine and those components attached directly to the Engine. When
replacingthe Light Engine, these components must be removed from the original Light Engine.
NOTE: To replace the Lamp Bal-
lasttheLightEnginemustremoved
fromthecabinet but doesn’t need
becompletely disassembled.

Page 18
MODEL: WD-525276 / WD-62526
Light Engine Replacement
Preliminary
Referto the chassisremoval procedure and remove theBACK-COVER and Metal Support Plate(page 8)
Light Engine Removal Procedure
The following steps describe how to remove the Light
Engine from the cabinet and those parts that are not
includedin a replacemantEngine
2) Removefixing screws(1) & (2) to remove
theSLIDE-LOCK-MATE
3a) Loosen [A-1] & [A-2] so that they do not
touch [A-3]. (4MMAllen wrench)
3b) Loosen lock nuts (1) and (2). (8MM open
endwrench)
3c) Turn [A-3] CCW so the [A-3] bolt clears the
EnginePlate. (5MMAllenwrench)
1) Remove(3)* screws (a)from Filter CoverHolder
(a)
(a)
(a)
Light Engine (Rear View)

MODEL: WD-525276 / WD-62526
Page 19
5) Removetwo screws (c) fromFan Plateand remove
Fan Plate
6) Disconnect all connectors
Light Engine Replacement
9) Remove4 screws(f) fromthe Lamp Fan.
(c) (c)
4) Removeone screw (b) securing engine plate and base
(b)
7) RemoveDVI cable and(2) connectors
8) Removewiring from three wiring clamps (d).
(d)
(d) (d)
(f) (f)
(f)
(f)

Page 20
MODEL: WD-52526 / WD-62526
11 Loosen (2) screws (h) to remove Ballast Cable
12) Disconnectall connectors from Interface PWB and
remove(2) screws (k) from Bracket
10) Remove(4) screws (g) from LampFan Bracket
13)Remove(4) screws(n)from IntakeCover
14) Removefour screws (a), (b), (c)and (d) to separate
Light Engine from Engine plate Screw(c)
(g)
(g)
(g)
(g)
(h)
(h)
(k) (k)
(n) (n)
(n) (n)
(c)
(a) (b)