Mitsubishi Electric WD-52525 Installation guide

Copyright © 2004 Mitsubishi Digital Electronics, Inc.
9351 Jeronimo Road, Irvine CA 92618-1904
2004
V26 Chassis
V26 Chassis
V26+ Chassis
V26++ Chassis
WD-52525
WD-52725
WD-52825
WD-62525
WD-62725
WD-62825
Digital Light Processing
Projection Television

1

I
Chapter 1 - Introduction
V26 Models ..................................................................................................................................... 1-1
HDMI & CableCARD ................................................................................................................. 1-2
RF Antenna Inputs ........................................................................................................................... 1-3
PVR (Personal Video Recorder) ....................................................................................................... 1-3
DLP Fundamentals ...................................................................................................................... 1-3
Light Path Changes ......................................................................................................................... 1-5
Servicing .......................................................................................................................................... 1-7
Chapter 2 - Disassembly
Front Disassembly........................................................................................................................... 2-1
Rear Disassembly ........................................................................................................................... 2-4
Accessing the Chassis .................................................................................................................... 2-5
Accessing PWB-POWER................................................................................................................ 2-6
Chassis Removal ............................................................................................................................. 2-6
Accessing & Disconnecting the Lamp Ballast.................................................................................. 2-7
Chapter 3 - Light Engine Replacement
Light Engine Assembly .................................................................................................................... 3-1
Airduct Removal............................................................................................................................... 3-2
Light Engine removal screws............................................................................................................ 3-2
Light Engine Removable Parts ......................................................................................................... 3-3
Installing the Replacement Light Engine .......................................................................................... 3-4
Chapter 4 - Service Adjustments
Option Menu .................................................................................................................................... 4-1
Service Adjustment Mode ................................................................................................................ 4-1
Internal Test Pattern ......................................................................................................................... 4-2
Service Adjustments ........................................................................................................................ 4-2
Position Adjustments ....................................................................................................................... 4-2
Mechanical Adjustments .................................................................................................................. 4-3
Required Disassembly ................................................................................................................. 4-3
Rotation Adjustment..................................................................................................................... 4-4
Keystone Adjustments ................................................................................................................. 4-6
Data Transfer & Data Reset ............................................................................................................. 4-7
Chapter 5 - Troubleshooting
Replaceable Components ................................................................................................................ 5-1
Normal Front Panel LED Indications ................................................................................................ 5-2
Abnormal Front Panel LED Indications............................................................................................. 5-2
Error Code Operational Check ......................................................................................................... 5-3
Lamp Troubleshooting Procedure ..................................................................................................... 5-4
POWER-PWB Troubleshooting ....................................................................................................... 5-4
Chapter 6 - Block Diagrams
Power Supply .................................................................................................................................. 6-2
Video Circuitry ................................................................................................................................. 6-3
Sound Circuitry ................................................................................................................................ 6-6
Control Circuitry ............................................................................................................................... 6-8
V26 Technical Training
Table of Contents

II

II

1-1
WD-52825
WD-52525 WD-52725
Chapter 1
Introduction
The new V26 Chassis types are all Integrated HD/Cable
Ready TVs. There are three V26 chassis types, V26,
V26+ and V26++. The specific models for each chas-
sis type are given in Table 1-1.
All of the models are table top models, but matching
bases are available for each model. The 52 inch model
for each chassis type is shown above, with it's matching
base.
All models feature:
Integrated HD/Cable Ready Circuitry
DLPTM Light Engine
CableCARDTM Slot
Memory Card Reader
HDMI Input
The V26+ models add:
Anti-Glare Diamond Shield
TV Guide On Screen ® (when available)
The 26++ models also include HD PVR (High Defini-
tion Personal Video Recorder) with a 120 GB Hard
Disc Drive.
Table 1-1: V26 Chassis Series Models
V26 Chassis
V26+ Chassis
V26++ Chassis
WD-52525
WD-52725
WD-52825
WD-62525
WD-62725
WD-62825

1-2
HDMI & CableCARD
The HDMI (High Definition Multimedia Interface)
video format is basically the DVI (Digital Visual Inter-
face) format. HDMI adds up to 8 channels of digital
sound transmission. It also includes an additional serial
bus that may be used for status and control purposes.
Although the HDMI format is similar to DVI, the con-
nectors are different. Figure 1-1 shows HDMI plug and
Figure 1-1: HDMI Connectors Figure 1-2
socket connectors. DVI to HDMI adaptors are avail-
able so DVI equipmeht can be connected to the TV..
The CableCARD feature is the basis for the new regu-
lation for Plug and Play Cable Standard. Figure 1-2
illustrates the typical CableCARD.
Both HDMI and CableCARD were described in detail
in the V25 Technical Description so it will not be re-
peated in this book.
Figure 1-3: Rear Panel Inputs and Outputs
CableCARD
Slot
HDMI
Input
ANT2
ANT1
A/V
Receiver VCR

1-3
Figure 1-3 shows the Rear Panel location of the HDMI
input socket and the CableCARD Slot.
RF Antenna Inputs
Note in Figure 1-3 there are only two RFAntenna In-
puts, instead of three. Signal input to ANT 1 is ampli-
fied and directed to both the Sub and Main Tuners.
The Main Tuner can process either NTSC or ATSC
(HD) signals. The Sub Tuner processes only NTSC
signals, mainly as a sub picture source.
TheANT 2 input connects directly through the Antenna
Relay, to the Main Tuner. Figure 1-4 is a simplified sche-
matic of the RF Antenna Splitter. The OOB (Out of
Band) Tuner is used when cable information and On
Screen Channel Guides are available.
PVR (Personal Video Recorder)
This feature is only available on V26++ models. It uti-
lizes a 120 GB Hard Drive (HDD) to record digital sig-
nals from either the Antenna Inputs or 1394 Inputs:
SD digital channels
HD digital channels
1394 digital signals.
It can also record analog 480i signals from the:
Antenna Inputs
External Composite Video Inputs
External S-Video Inputs
Analog 480i signals are converted to digital and then
MPEG-2 compressed before recording on the HDD.
The PVR also features "TV Pause" and up to 30 min-
utes of the current program is recorded. This enable a
rewind feature for up to 30 minutes and the TV Pause
feature..
DLP Fundamentals
Although the basic principles have not changed, a quick
review of Digital Light Processing system may be in
order. Figure 1-5 illustrates the Overall DLP Sys-
tem.
A light source is directed through a RGB Color Filter
wheel. and is directed to the reflective surface on a
DMD IC (Digital Micromirror Device). Light from

1-4
DMD
Color
Filter
Lens
Lamp
Figure 1-5: Overall DLP Color System
the DMD is directed through a Projection lens to the
Projection Screen.
Figure 1-6 shows a close up of a DMD IC. What ap-
pears to be a single mirror on the IC is actually close to
one million individual mirrors, refer to Figure 1-7.
Figure 1-8 shows that the tilt of each mirror is controlled
by changing tilt to either ±10 degrees. The tilt of the
mirror determines if the light from the mirror passes
through the Projection Lens to the screen (light pixel), or
to a light absorber (dark pixel), refer to Figure 1-9. Figure 1-6: Digital Micromirror Device
Figure 1-7: Micro Mirrors
-10 +10
Figure 1-8: ±10 Degree Mirror Tilt

1-5
Although the basic fundamentals still apply, the Light En-
gine has been improved and is much smaller than in pre-
vious models. Also the light path from the Projection
Lens to the screen has been changed.
Figure 1-9: Light Pixel / Dark Pixel
Light Path Changes
Figure 1-10 illustrates the Light Path in V26 models.
The light from the Light Engine Projection Lens is now
directed toward a small mirror in the front of the cabi-
net.

1-6
From the small mirror the light is reflected to the con-
ventional large mirror and then to the projection screen.
In previous DLP models the small mirror was not used.
Figure 1-11 shows the V26 Light Engine. Although not
evident in Figure 1-11, it is much smaller that the En-
gine in previous models. The Engine is supported by an

1-7
AdjusterAssembly which includes the picture rotation
adjustment screw.
Figure 1-12 illustrates the front and back sides of the
small mirror. The position of the small mirror is con-
trolled by the adjustments on the back side of the mir-
ror. These adjustments control Horizontal and Vertical
Keystone distortion.
In nearly all cases no adjustments are required during
servicing. The only time adjustments may be required
are when the Chassis or Light Engine has been replaced.
NOTE: Warranty payment for adjustments
is only valid if the Chassis or Light Engine
has been replaced.
Servicing
Servicing the V26 series of models is Down to Major
Component Replacement Level Only. The major
components in V26 models are the:
Chassis
Light Engine
Lamp Ballast
Hard Drive (V26++ only)
Figure 1-13 shows the location of the three main ma-
jor components used on all models.
Sub Assemblies can be ordered separately, such as:
Card Reader
Cooling Fans
Front Panel PWBs

1-8
CHASSIS LIGHT ENGINE LAMP BALLAST
Figure 1-13: Major Components

2-1
Servicing the V26 models consists mainly of replacing
major components. These disassembly procedures are
geared to accessing and replacing these major compo-
nents:
Light Engine
Chassis
Lamp Ballast
PWB-POWER (Optional)
To order any of the major components, T/A(Technical
Advisory) authorizations is required.
Front Disassembly
Front Disassembly is not required for accessing or re-
moval of the Chassis, but is required for Light Engine
replacement and to perform mechanical adjustments.
One new component used in the V26 and V25 models
is a reusable Wire Tie, shown in Figure 2-1. Do Not
cut the Wire Tie during disassembly. Lift the tab to re-
lease the Wire Tie lock.
Figure 2-1: Re-usable Wire Tie
LIFT TAB
Chapter 2
Disassembly

2-2
There are two basic Front Disassembly procedures, one
for V26 and V26+ models, and one for the V26++
models. Figure 2-2 illustrates Front Disasssembly for
the V26 and V26+ models
1) Pull off the Speaker Grille.
2) Remove four screws (a) securing the COVER-
FRONT.
3) Remove 10 screws (b) from the Upper Rear
Cover.
 3 screw on each side
 4 screws across the top
4) Remove 6 screws (c) at the bottom of the
ScreenAssembly.
5) Unplug the LN connector from the Control
Panel.
6) Lift the screen assembly slightly and then pull
away from the cabinet.
WD-52525/WD-62525
WD-52725/WD-62725

2-3
The front Cabinet Disassembly for the V26++ models
is illustrated in Figure 2-3.
1) Pull off both Speaker Grilles.
2) To remove the COVER-FRONT, remove 4
screws (a).
3) Remove 7 screws (b), to remove the GRILLE-
BASE.
4) To remove the Screen Assembly:
 Unplug the LN connector.
 Remove 6 screws (c) from the bottom of
the Screen Assembly.
 Remove 10 screws (d) from the upper rear
cover.
 To remove the Screen Assembly, lift
upward and then away from the cabinet.
WD-52825/WD-62825

2-4
Rear Disassembly
The Rear Cabinet Disassembly is basically the same for
all models. Figure 2-4 illustrates the COVER-BACK
removal.
1) Remove 2 screws (d) to remove the Filter
Cover.
2) Remove screws from the COVER-BACK,
9 screws (a), 6 screws (b) and 2 screws (c).
3) Pull the COVER-BACK from the cabinet.
Figure 2-5 shows the Rear Plate removal procedure.
1) Remove 6 screws (a) at the sides of the Rear
Plate.
2) Remove 10 screws (b).
3) Lay the Rear Plate on the floor behind the set,
Figure 2-6.
Figure 2-5: Rear Plate Removal
(a)
(a)
(b)
(b)
(a)
(a)
(b)
(b)
(b)

2-5
Accessing the Chassis
1) Remove the 4 screws (a), ( Figure 2-7)
2) Unplug the USB and 1394 from the Card
Reader, Figure 2-8.
NOTE: In the V26++ models, the 1394
connector plugs into the Hard Drive Module.
3) Carefully slide the chassis toward the rear of the
cabinet.
Figure 2-6: Rear Plate Removed

2-6
Accessing PWB-POWER
1) Carefully rotate & slide the chassis from the
cabinet to access the front of the chassis.
Figure 2-10: PWB-POWER, Shield Removed
2) Remove 8 screws (a), Figure 2-9
3) Remove PWB-POWER shield, Figure 2-10
Chassis Removal
After removing the screws and cables shown in Figure 2-7:
1) Disconnect all cables to the front of the cabinet and the Light Engine.
2) Disconnect the cables to the Lamp Ballast (see the following procedure).
(a)
Figure 2-9: PWB-POWER Shield Removal

2-7
Remove the Right Rear Support Bracket
1) Remove the 3 screws (a) holding the rear right
support bracket, Figure 2-13.
2) Lift the upper cabinet slightly to remove the
support backet.
(a)
Figure 2-13: Rear Right Support Removal
Lift upper cabinet
slightly to remove
support.
Acccessing & Disconnecting the Lamp Ballast
Remove the Lamp Ballast Shield
1) Remove the 4 screws, Figure 2-14.
2) Remove the Ballast Shield
Unplug the connectors to the Lamp Ballast
Refer to Figure 2-15.
4 Screws
Figure 2-14: Ballast Shield Removal
Unplug
Connectors
Figure 2-15: Unplug Ballast Connectors