Mitsubishi Electric WD-52525 User manual

CAUTION:
Before servicing this chassis, it is important that the service person read the "SAFETY PRECAUTIONS" and
"PRODUCT SAFETY NOTICE" contained in this manual.
• Design specifications are subject to change without notice.
MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
9351 Jeronimo Road, Irvine, CA 92618-1904
Copyright © 2004 Mitsubishi Digital Electronics America, Inc.
All Rights Reserved
MITSUBISHI ELECTRIC
SerSer
SerSer
Servicevice
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ManualManual
ManualManual
Manual
2004
DIGITAL LIGHT PROCESSING™ PROJECTION TV
V26 CHASSIS
SPECIFICATIONS
• Power Input : AC 120V, 60Hz
•Power Usage : 275W
• Light Engine : DLP 0.85" 1280 x 720p
• Lamp : 120W VIP Type
• Channel Frequencies : Air - VHF 2 ~ 13 UHF 14 ~ 69
Analog Cable - 1 ~ 125
Digital Cable - 1 ~ 135
•Antenna Input : 2 RF 75Ω unbalanced
• Tuning :1 NTSC/ATSC/QAM64&256
1 CableCARD™ Slot
1 NTSC for PIP
• Cabinet Dimensions : [WD-52xxx] 37.2" x 49.6" x 17.4"
[WD-62xxx] 43.7" x 58.3" x 19.9"
• Weight : [WD-52xxx] 132.4 lbs
[WD-62xxx] 165.5 lbs
•Speakers (10Wx2) : 5" Coaxial x 2
• Input Level : VIDEO IN JACK (RCAType)
1.0Vp-p 75Ω unbalanced
AUDIO IN JACK (RCA Type)
500mV RMS full scale into 43kΩ,
unbalanced
: S-VIDEO IN JACK
(Y/C separate type)
Y:1.0 Vp-p C:0.286Vp-p(BURST)
75Ω unbalanced, 480i
: COMP / Y, Pr, Pb (RCA Type )
Y: 1.0 Vp-p Pr, Pb: 700mVp-p, 480i,
480p, 720p, 1080i
: DTV / Y(G), Pr(R), Pb(B), H, V (RCA
Type) Y: 1.0 Vp-p Pr, Pb: 700mVp-p,
75Ω, H, V: 3.0Vp-p, 480i, 480p,
720p, 1080i
:VGA / R,G,B,V,H (15 pin D) 640x480,
800x600, 1024x768, 720x1280,
60Hz
• Output Level : VIDEO OUT JACK (RCA Type)
1.0Vp-p 75Ω unbalanced
: AUDIO OUT JACK (RCA Type)
500mV RMS (+/-200mV)
full scale into 4.7kΩ, unbalanced
• Digital : IEEE-1394 I/O Jacks
Interface : AC-3 Digital Audio Output (RCA
Type) 1.5V RMS
: HDMITM
:MonitorLinkTM Control/RS-232C
: 4 Memory Card Reader Inputs
WD-52525
V26 V26+ V26++
WD-52525 WD-52725 WD-52825
WD-62525 WD-62725 WD-62825
MODELS

MODEL: WD-52525 / WD-52725 / WD-52825 / WD-62525 / WD-62725 / WD-62825
Page 3
INTRODUCTION ................................................................................................................................5
PRODUCT SAFETY NOTICE ...........................................................................................................5
SAFETY PRECAUTIONS ................................................................................................................. 6
DISASSEMBLY PROCEDURES ......................................................................................................... 7
Cabinet Front Disassembly ............................................................................................................. 7
Cabinet Rear Disassembly .............................................................................................................. 9
ELECTRICAL CHASSIS REPLACEMENT ........................................................................................ 10
OPTICAL ENGINE REPLACEMENT ................................................................................................. 13
DATA COPY PROCEDURE ............................................................................................................... 16
DIAMONDSHIELD™ REPLACEMENT .............................................................................................. 17
SERVICING THE LENTICULAR SCREEN AND FRESNEL LENS ..................................................... 18
INITIAL SETUP ................................................................................................................................ 20
FRONT PANEL LED DIAGNOSTICS ................................................................................................ 22
SERVICE ADJUSTMENTS ............................................................................................................... 24
Equipment .................................................................................................................................... 24
Circuit Adjustment Mode ............................................................................................................... 24
Adjustment Items and Initial Data Settings ................................................................................... 26
Electrical Adjustments .................................................................................................................. 27
Mechanical Adjustments ............................................................................................................... 27
REPLACEMENT PARTS .................................................................................................................. 30
SCREEN ASSEMBLY PARTS .......................................................................................................... 33
CIRCUITRY BLOCK DIAGRAMS ..................................................................................................... 35
PCB INTERCONNECT DIAGRAM
CONTENTS

MODEL: WD-52525 / WD-52725 / WD-52825 / WD-62525 / WD-62725 / WD-62825
Page 4

MODEL: WD-52525 / WD-52725 / WD-52825 / WD-62525 / WD-62725 / WD-62825
Page 5
INTRODUCTION
This service manual provides service instructions for PTV Models and Chassis:
V26 Chassis V26+ Chassis V26++ Chassis
WD-52525 WD-52725 WD-52825
WD-62525 WD-62725 WD-62825
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, Optical Engine, Lamp Ballast, etc..
4. Electrical adjustments.
5. Optical Adjustments.
6. Chip parts replacement procedures.
7. Simplified circuit path diagrams.
8. Overall PCB interconnect block diagram.
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 charac-
teristics 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.
Digital Light Processing, Digital Micromirror Device and DLP are trademarks of Texas Instruments.
CableCARD is a trademark of Cable Television Laboratories, Inc.
HDMI, the HDMI logo and High-Definition Multimedia Interface are trademarks or registered trademarks of HDMI Licensing LLC.

Page 6
MODEL: WD-52525 / WD-52725 / WD-52825 / WD-62525 / WD-62725 / WD-62825
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.
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 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 1Megohm. 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).
WARNING ... RISK OF EYE INJURY
Do not look into the light source, lens or mirror when operating the TV.

MODEL: WD-52525 / WD-52725 / WD-52825 / WD-62525 / WD-62725 / WD-62825
Page 7
CABINET DISASSEMBLY(FRONT VIEW)
WD-52525 / WD-62525 / WD-52725 / WD-62725
Front Cabinet Disassembly
1. Remove the SPEAKER-GRILLE by pulling forward.
2. Remove screws (a) to remove the COVER-FRONT.
3. Remove screws (b) on the rear of the upper back cover (4 across the top and 3 on each side).
4. Remove the 4 screws (c) holding the bottom of the Screen Assembly.
5. Unplug connector LN from the Control Panel.
6. Lift the Screen Assembly up slightly then pull towards the front to remove the assembly.
*Refer to the Parts List for Part Numbers
Reusable Wire Ties
Do not cut wire ties during disassembly, reusable
wire ties are used in these models. Lift the tab to re-
lease the wire tie. During reassembly, re-use wire ties to
ensure all wiring harnesses are properly bundled and
dressed.
Wire Tie
Lift Tab to Release

Page 8
MODEL: WD-52525 / WD-52725 / WD-52825 / WD-62525 / WD-62725 / WD-62825
CABINET DISASSEMBLY(FRONT VIEW)
WD-52825 /WD-62825
*Refer to the Parts List for Part Numbers
Front Cabinet Disassembly
1. Remove the SPEAKER-GRILLES by pulling forward.
2. Remove screws (a) to remove the COVER-FRONT.
3. Remove screws (b) to remove the GRILLE-BASE.
4. Remove screws (d) on the rear of the upper back cover (3 on each side and 4 across the top).
5. Remove the 4 screws (c) holding the bottom of the Screen Assembly.
6. Unplug connector LN from the Control Panel.
7. Lift the Screen Assembly up slightly then pull towards the front to remove the assembly
8. To disconnect the Card Reader and the Front Inputs:
• Unplug the Card Reader USB connector from the PCB-DM.
• Unplug the Front 1394 cable from the HDD Module (Hard Drive).
• Unplug the CC connector from the Front Inputs.

MODEL: WD-52525 / WD-52725 / WD-52825 / WD-62525 / WD-62725 / WD-62825
Page 9
CABINET DISASSEMBLY(REAR VIEW)
(a) (a)
(b)
(
b
)
(a) (a)
(b)
(
b
)
(b)
FILTER-COVER Removal
Remove 2 screws (d) to remove the Fil-
ter Cover.
COVER-BACK Removal
1) Remove 9 screws (a)
2) Remove 5 screws (b)
3) Remove 2 screws (c)
4) Pull the COVER-BACK
from the cabinet.
Rear Plate Removal
1) Remove 6 screws (a)
2 Remove10 screws (b)
3) Pull the Rear Plate from the
cabinet.
NOTE: To operate set with the Cover-Back and Rear Plate removed, re-install the Filter Cover and ensure the Exhaust Fan
is connected.

Page 10
MODEL: WD-52525 / WD-52725 / WD-52825 / WD-62525 / WD-62725 / WD-62825
ELECTRICAL CHASSIS REPLACEMENT
1) Remove the 4 black screws (a) securing the chassis shown in the two diagrams below.
2) Unplug the USB and 1394 connectors from the Card Reader.
NOTE: In the V26++ chassis the Card Reader 1394 connector plug into the Hard Drive Module.
3) Disconnect all cables to the front of the cabinet, the Optical Engine and the Lamp Ballast (see next page).
4) Carefully slide the chassis from the cabinet.
5) IMPORTANT: After Electrical Chassis replacement, perform the Data Copy Procedure (page 16).