Mitsubishi WD-62526, WD-52526 Service Manual

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MITSUBISHI ELECTRIC

ManualManual

Manual

ManualManual

LCD PROJECTION HDTV V28L CHASSIS

V28L Chassis

WD-52327

WD-52526

CAUTION:

Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and "PRODUCT SAFETY NOTICE" contained in this manual.

SPECIFICATIONS

• Power Input : AC 120V, 60Hz

• Power Usage : 295W

• Light Engine : 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 : 1 NTSC/A TSC/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

• Input Level : VIDEO IN JACK (RCA T ype)

• Output Level : VIDEO OUT JACK (RCA T ype)

• Digital : AC-3 Digital Audio Output

WD-52526 WD-62526

Pb Solder

1.0Vp-p 75W unbalanced

: AUDIO IN JACK (RCA T ype)

-4.7dBm 43kW unbalanced : S-VIDEO IN JACK

(Y/C separate type) Y:1.0 Vp-p C:0.286Vp-p(BURST) 75W unbalanced

: COMP / Y , Cr, Cb (RCA T ype)

Y: 1.0 Vp-p Cr, Cb: 700mVp-p

1.0Vp-p 75W unbalanced

: AUDIO OUT JACK (RCA T ype)

-4.7dBm 4.7kW unbalanced

(RCA T ype)

: HDMI

• Speakers (8 Ohms 10W)

: 2-5 ½ x 2 ¼ inch

• Design specifications are subject to change without notice.

MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.

9351 Jeronimo Road, Irvine, CA 92618-1904

Pb Solder

: Lead-Free solder PWBs

MODEL: WD-52526 / WD-62526

CONTENTS

INTRODUCTION ................................................................................................................................5

PRODUCT SAFETY NOTICE ...........................................................................................................5

SAFETY PRECAUTIONS .................................................................................................................6

DISASSEMBLY .................................................................................................................................7

Front Cabinet Components .............................................................................................................7

Chassis Removal ............................................................................................................................8

Chassis Disassembly / Accessing PWBs.....................................................................................12

Light Engine Replacement ............................................................................................................17

SERVICING THE LENTICULAR LENS AND FRESNEL SCREEN..................................................... 22

Removal of the Lenticular Screen and Fresnel Lens ...................................................................... 22

Installation of the Lenticular Screen and Fresnel Lens................................................................... 24

ADJUSTMENTS ............................................................................................................................... 25

Option Menu & Defaults ................................................................................................................25

LED Indicator Diagnostics.............................................................................................................26

Error Codes Operational Check..................................................................................................... 27

Service Adjustment Mode .................................................................................................... 28

Service Adjustment Mode Operation ....................................................................................28

Transferring data ..................................................................................................................29

Light Engine Adjustment ............................................................................................................... 30

T est Signal activation ........................................................................................................... 30

Preliminary .......................................................................................................................... 30

Trapezodial Distortion Adjustment........................................................................................ 31

Rotation Adjustment.............................................................................................................31

Hortizontal & V ertical Position.............................................................................................. 32

TROUBLESHOOTING ...................................................................................................................... 33

MICRO / TERMINAL PWBs ................................................................................................. 33

POWER-PWB ..................................................................................................................... 33

OPTICAL ENGINE ............................................................................................................... 34

Protect Lines .......................................................................................................................35

USING LEAD FREE SOLDER .......................................................................................................... 36

CHIP P ARTS REPLACEMENT ......................................................................................................... 37

REPLACEMENT P ARTS .................................................................................................................. 38

Parts Ordering .............................................................................................................................. 38

Critical and Warranty Parts Designation........................................................................................ 38

Parts T olerance Codes.................................................................................................................. 38

Quick Reference List ...........................................................................................................

SERVICE PARTS LIST .................................................................................................................... 40

SCREEN ASSEMBL Y PARTS LIST.................................................................................................. 48

CIRCUITRY BLOCK DIAGRAMS ..................................................................................................... 49

Main Power Supply....................................................................................................................... 49

Lamp Ballast DC Supply............................................................................................................... 50

Fans Power Supply....................................................................................................................... 50

......... 39

Page 3

MODEL: WD-52526 / WD-62526

Power Distribution......................................................................................................................... 51

Analog Video Signal Path .............................................................................................................52

Digital Video Signal Path ..............................................................................................................53

Sound Signal Path ........................................................................................................................ 54

Command Input Circuitry............................................................................................................... 55

Serial Data Control Lines ..............................................................................................................55

Lamp Control Circuitry ..................................................................................................................56

Shutter Control.............................................................................................................................. 56

Lamp, Engine and Fan’s Protect circuitry ..................................................................................... 57

SCHEMA TIC DIAGRAMS .....................................................................................................................

Page 4

MODEL: WD-52526 / WD-62526

INTRODUCTION

This service manual provides service instructions for LCD Projection TV Models WD-52526 and WD-62526, using chassis V28L.

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 down to major components, chassis, PWBs, Light Engine, Lamp Ballast, etc..

4. Adjustments.

5. Lead Free Soldering.

6. Chip parts replacement procedures.

7. Simplified circuit path diagrams.

The parts list section of this service manual includes:

1. Cabinet and 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

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 type in

the parts list of this service manual. Therefore, the replacement for any safety part should be identical in value

and characteristics.

The PWBs used in the V28L chassis are constructed using Lead-Free solder . When servicing

Pb Solder

use only recommended Lead-Free solder (refer to page 36).

HDMI is a trademark of HDMI Licensing, LLC.

Page 5

MODEL: WD-52526 / WD-62526

SAFETY PRECAUTIONS

NOTICE: Observe all cautions and safety related notes located inside the receiver cabinet and on the

receiver chassis.

WARNING:

1. Operation 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. 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.

WARNING ... RISK OF EYE INJUR Y Do not look into the light source, lens or mirror when operating the TV

Leakage current check

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 shaf ts, 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 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. The leakage current must not exceed 0.5 milliampere (mA).

Page 6

MODEL: WD-52526 / WD-62526

CABINET FRONT DISASSEMBLY

SPEAKER GRILLE Removal

Pull the 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 ) Unplug the LL connector to the front CONTROL-PANEL. 4 ) Lift the SCREEN-ASSY up slightly and then pull away from the cabinet.

Page 7

CHASSIS REMOVAL

BACK-COVER Removal

1 ) Remove 9 screws (a) 2 ) Remove 13 screws (b) 3 ) Pull the COVER-BACK from the cabinet.

MODEL: WD-52526 / WD-62526

Metal Support Plate Removal

Remove 4 screws (a) to remove the metal support plate,

(a)

Page 8

MODEL: WD-52526 / WD-62526

Chassis Mounting Screws Removal

Remove the two chassis mounting screws (b).

(b)

Release Cable Clamps & Disconnect CE Connector

Cable

Clamp

Connector

Cable

Clamp

(b)

Cable

Clamp

Page 9

MODEL: WD-52526 / WD-62526

On the right side of the chassis (from the rear):

1 ) Release the AC Cord from it’s mounting. 2 ) Unplug ES1 connector to the speakers.

AC Cord

Chassis removal from the Cabinet

Carefully rotate the chassis clockwise to slide it from the cabinet.

ES1 Connector

Page 10

MODEL: WD-52526 / WD-62526

Complete Chassis Removal

T o completely remove the chassis from the cabinet, 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-FORMA T (right side of chassis).

Page 11

J8F01

MODEL: WD-525276 / WD-62526

Chassis Disassembly / Accessing PWBs

Note: Although not individually indicated, unplug the required connectors in each

disassembly step.

Chassis Sequence of Disassembly

REMOVE

Chassis Top Cover

(Fig . 1 )

REMOVE

Assy PWB-TERMINAL

(Fig . 2 )

REMOVE

PWB-POWER

(Fig . 3 )

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)

Page 12

MODEL: WD-525276 / WD-62526

Chassis Cover Removal (Figure 1)

1 ) Remove the 4 screws (a). 2 ) Lift the Cover from the chassis.

Figure 1: Chassis Cover Removal

Assy PWB- TERMINAL Removal (Figure 2)

1 ) Remove 7 screws (a) to remove

the TERMINAL-INLA Y. 2 ) Remove 3 screws (b) to remove

the Assy PWB-TERMINAL.

Figure 2: ASSY PWB-TERMINAL Removal

Page 13

MODEL: WD-525276 / WD-62526

PWB-POWER Removal (Figure 3)

1) Remove four screws (b). 2 ) Disconnect all connectors to PWB-POWER. 3 ) Lift PWB-POWER from the chassis.

Chassis Upper Shield Removal (Figure 3)

1) Remove seven screws (c). 2 ) Lift the Shield from the chassis.

Figure 3: PWB-POWER and Chassis Upper Shield

Page 14

Chassis Rear Shield Removal (Figure 4)

1) Remove seven screws (c).

2) Remove nut (c1). 3 ) Pull off Chassis Rear Shield.

MODEL: WD-525276 / WD-62526

Figure 4: Chassis Rear Shield Removal

PWB-MICRO Removal Referring to Figure 5.

1 ) Remove three screws (d). 2 ) Unplug PWB-MICRO from PWB-RISER

and remove from the chassis.

Page 15

Figure 5: PWB-MICRO Mounting Screws

MODEL: WD-525276 / WD-62526

PWB-RISER and PWB-FORMA T Removal Referring to Figure 6.

1) Remove one screw (e). 2 ) Unplug and remove PWBs RISER

and FORMA T .

PWB-DM Removal (Figure 7)

1 ) Remove three screws (g) holding the PWB-

MICRO Support Bracket. 2 ) Remove the Support Bracket. 3 ) Remove the five screws (h). 4 ) Remove the PWB-DM from the chassis.

Figure 6: PWBs RISER and FORMA T Removal

Page 16

Figure 7: PWB-DM Removal

MODEL: WD-525276 / WD-62526

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 replacing the Light Engine, these components must be removed from the original Light Engine.

Page 17

NOTE: To replace the Lamp Bal-

last the Light Engine must removed from the cabinet but doesn’t need be completely disassembled.

MODEL: WD-525276 / WD-62526

Light Engine Replacement

Preliminary

Refer to the chassis removal procedure and remove the BACK-COVER and Metal Support Plate (page 8)

1 ) Remove (3)* screws (a) from Filter Cover Holder

Light Engine Removal Procedure

The following steps describe how to remove the Light Engine from the cabinet and those parts that are not included in a replacemant Engine

(a)

Light Engine (Rear View)

2 ) Remove fixing screws (1) & (2) to remove

the SLIDE-LOCK-MATE

3a) Loosen [A-1] & [A-2] so that they do not

touch [A-3]. (4MM Allen wrench)

3b ) Loosen lock nuts (1) and (2). (8MM open

end wrench)

3c) Turn [A-3] CCW so the [A-3] bolt clears the

Engine Plate. (5MM Allen wrench)

Page 18

MODEL: WD-525276 / WD-62526

Light Engine Replacement

4 ) Remove one screw (b) securing engine plate and base

5 ) Remove two screws (c) from Fan Plate and remove

Fan Plate

6 ) Disconnect all connectors

(b)

(c)

7 ) Remove DVI cable and (2) connectors

(c)

8 ) Remove wiring from three wiring clamps (d).

(d)

Page 19

9 ) Remove 4 screws (f) from the Lamp Fan.

(f)

MODEL: WD-52526 / WD-62526

10 ) Remove (4) screws (g) from Lamp Fan Bracket

(g)

12 ) Disconnect all connectors from Interface PWB and

remove (2) screws (k) from Bracket

(g)

1 1 Loosen (2) screws (h) to remove Ballast Cable

(h)

13) Remove (4) screws (n) from Intake Cover

(n)

(k)

14 ) Remove four screws (a), (b), (c) and (d) to separate

Light Engine from Engine plate Screw (c)

(a)

(b)

(n)

(c)

Page 20

Screw (d)

MODEL: WD-52526 / WD-62526

15) Lift the Engine from Engine plate leaving the Lamp Duct fan, Lamp Duct Intake and Ballast.

(d)

INSTALLATION

1) Reverse the above steps. 2 ) Copy White Balance Data to PWB-FMT (refer to page 29). 3 ) Refer to the Adjustment Section and perform Trapezodial Distortion, Rotation and

Position adjustments as necessary.

Page 21

MODEL: WD-52526 / WD-62526

SERVICING THE LENTICULAR SCREEN AND FRESNEL LENS

CAUTION: Wear gloves when handling the Lenticular Screen and Fresnel Lens.

This prevents cuts and finger prints. Do not place Fresnel Lens in the sun. This may cause fire and heat related injuries.

Lenticular Screen and Fresnel Lens Removal

1. Remove the screen assembly as shown in the Cabinet Disassembly procedure.

2. Remove the four screws (a) to remove the bottom of the SCREEN-FRAME-BOTTOM . (Figure 1)

3. From the front of the screen assembly, slide the BEZEL out the bottom of the Screen Frame. (Figure 2)

4. From the rear of the screen assembly, carefully slide the Lenticular Screen and Fresnel Lens combination from the Screen Frame. (Figure 3)

Note: When separating the Lenticular Screen from the Fresnel Lens, use caution

while prying the Screen and Lens apart. Use a slot type screw driver, and remove the pressure sensitive double sided tape.

Figure 1: SCREEN-FRAME-BOTTOM Removal (Rear View)

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