Mitsubishi Electric WS-48513 Programming manual

MITSUBISHI ELECTRIC
MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.
T
2003
ECHNICAL
RAINING
Projection Television
Technical Training &
Troubleshooting Manual
WS-48613 WS-65713 WS-55813
WS-55613 WS-73713 WS-65813
WS-65613
V23
WS-48513
WS-55513
WS-65513
WS-73513
V23+ V23++ V23+++
V23
V23

T
2003
ECHNICAL
RAINING
V23 Chassis
Projection Television
Technical Training &
Troubleshooting Manual
Copyright © 2003, Mitsubishi Digital ElectronicsAmerica, Inc.
All Rights Reserved

I
Introduction ... New Technologies
Models ............................................................................................................... 1
Features ............................................................................................................... 2
NetCommand™ 3.0 ............................................................................................. 3
Five Format Memory Card Reader ....................................................................... 4
PerfectColor™ ...................................................................................................... 5
MonitorLink™ ....................................................................................................... 6
Service Code Chart ............................................................................................ 12
Chapter1 ... Disassembly and Service
Disassembly Procedures ................................................................................... 1-1
DM Replacement .............................................................................................. 1-2
PCB & Main Component Locations ................................................................... 1-4
Convergence Output IC Replacement .............................................................. 1-5
Composite Cabinet ............................................................................................ 1-6
Chapter 2 ... Alignment Procedures
Initial Setup ....................................................................................................... 2-1
Circuit Adjustment Mode ................................................................................... 2-3
ConvergenceAdjustment Mode ......................................................................... 2-5
Alignment Data Storage Locations .................................................................... 2-6
Chapter 3 ... Power Supply
Low Energy Power Supply ................................................................................ 3-1
Standard Standby Power Supply ....................................................................... 3-4
Time Shift Recording Power Supply .................................................................. 3-2
Switched Supplies ............................................................................................. 3-7
Troubleshooting................................................................................................. 3-8
Chapter 4 ... Control Circuitry
Basic uPC Requirements .................................................................................. 4-1
Reset Circuitry ................................................................................................... 4-2
Input Command Circuitry................................................................................... 4-3
Serial Data Lines ............................................................................................... 4-4
Parallel Input Lines ............................................................................................ 4-5
Parallel Outputs ................................................................................................. 4-7
V23 CHASSIS
TECHNICAL TRAINING AND TROUBLESHOOTING MANUAL
TABLE of CONTENTS

II
Chapter 5 ... Video/Color Circuitry
Overall Block Diagram ....................................................................................... 5-1
PCB-Terminal .................................................................................................... 5-2
PCB-Signal ........................................................................................................ 5-3
RGB CRT Drive & Protect Circuitry ................................................................... 5-4
Digital Signal Path ............................................................................................. 5-5
Monitor Out ....................................................................................................... 5-6
Chapter 6 ... Sync, Deflection and High Voltage
Overall Block Diagram ....................................................................................... 6-1
Sync Signal Path ............................................................................................... 6-2
Vertical Deflection ............................................................................................. 6-5
Horizontal Deflection ......................................................................................... 6-5
Deflection Loss Detection.................................................................................. 6-7
High Voltage & HV Regulation .......................................................................... 6-8
X-Ray Protect .................................................................................................... 6-9
Chapter 7... Convergence Circuitry
Overall Block Diagram ....................................................................................... 7-1
Waveform Generator and D/A Converter .......................................................... 7-2
LPF and Summing Amplifiers ............................................................................ 7-3
Convergence Output Circuitry ........................................................................... 7-4
Chapter 8 ... Sound Circuitry
Overall Block Diagram ....................................................................................... 8-1
Signal Path ........................................................................................................ 8-2
Chapter 9 ...Troubleshooting Tips
Using the Front Panel LED................................................................................ 9-1

1
Introduction
The V23 Chassis is carried in the Gold, Gold Plus,
Platinum and Diamond series models for 2003 and
2004. This full featured, integrated HDTV chassis
represents the latest technologies in CRT based pro-
jection television. A breakdown of V23 models is
shown in Table 1.
Features
Table 2 shows some of the major features by model
category. Some of the features are carried over from
previous years, some have been improved upon and
some are totally new. In addition to all the user fea-
tures, the V23 chassis includes many serviceability
features.
Carry Over Features
•IEEE1394, FireWire
•DTV Link
•VGA Input
•QuadField Focus
•TruFocus Lenses
•Gold Plated Jacks
•2 Piece Cabinets (65" & 73")
•Fine Pitch Lenticular Screen
•Anti-glare DiamondShield
Series Gold Gold Plus Platinum Diamond
Chassis V23 V23+ V23++ V23+++
48" W WS-48513 WS-48613
55" W WS-55513 WS-55613 WS-55813
65" W WS-65513 WS-65613 WS-65713 WS-65813
73" W WS-73513 WS-73713
Screen
Size
Table 1: V23 Models
Improved Features
•3rd Generation HDTV Receiver
•NetCommand 3.0 with IR Learning
•PerfectColor - All Inputs and Signal Types
•AMVP™ Improved Performance
•9" CRTs now available in a 65" Model
•Coaxial and 2-way speaker systems
•Contemporary cabinet in a 55" Model
New Features
•5 Format Memory Card Reader
•MonitorLink™ Input
•Low Energy Mode
Serviceability Features
•Modular design with "Light Box"
•Self Diagnostics
•Serviceable to Component or PCB level.
•ATSC Tuner/Decoder circuitry separated
from DM assembly.
•Reduction in number of stand-up PCBs.
•Service Adjustment Mode Data Reset.
This section will provide further explanation on the
following features that are either new or may have
the most impact on service:
1) NetCommand 3.0
2) 5 Format Memory Card Reader
3) PerfectColor
4) MonitorLink

2
Feature Explaination
ATSC and Unscrambled QAM Reception
Greater Sensitivity
NetCommand™ 3.0 Home Theater Control by Firewire or IR
Five-Format Memory Card Reader For viewing JPEG digital photos and listening to
MP3 or WMA audio recordings.
AMVP (Advanced Multimedia Video
Processor)
8 Screen Formats, Improved Line Doubling and
Noise Reduction
FireWire/IEEE1394Digital Home Networking Interface.
DTV-LINK Standard for future FireWire interfaces.
PerfectColor™ Individual Control of 6 Colors
Low Energy Mode Reduced Power Consumption in Standby
MonitorLink™ Input Digital Video Input
VGA Input 640x480 - 60HZ
QuadField Focus™ Magnetic Focus Assembly on CRT Neck.
Results in smaller electron beam.
Two-way Coaxial Speakers WS-55613 & WS-65613. Improved Audio.
Tru-Focus™ Lenses Improved and more uniform focus.
Two-way Speaker System 6" Woofer & 1.5" Tweeter for improved audio.
Gold Plated Jacks Gives high quality connections.
High Gloss Black.
Composite Back has Reduced Weight
Fine-Pitch Lenticular Screen Best Horizontal Resolution
Anti-glare DiamondShield™ Reduction in Reflections
9" CRT (WS-65813) Improved Brightness and Resolution
9" CRTs in all 73" Models Improved Brightness and Resolution
2 Piece Cabinet (65" & 73" Models) Simplifies Delivery
3rd Generation HDTV Receiver
V23 Features
V23+ Features
(Additional Features)
Other Features
Table 2: Features
Contemporary Cabinet
V23++ Features
(Additional Features)
V23+++ Features
(Additional Features)

3
NetCommand 3.0
NetCommand allows most common
home theater products to be connected
and controlled by way of the TV's re-
mote control by simply selecting on-
screen icons. See Figure 1.
The control interface can be by one of
two means.
•IEEE1394/Firewire
•Infrared (IR Blaster)
The 3rd generation of NetCommand offers additional
functionality and a simplier user interface.
When using the Firewire, NetCommand is "plug-
and-play." For the end user, it makes all digital video,
audio and control connections with one cable (Fig-
ure 2).
All other configuration is automatic. For control, the
industry standard sofware supported includes:
•AV/C - Includes common functions such as
Stop, Play, FF, RWD, etc.
•HAVi - Includes AV/C but also allows a
higher level of sofware communication for a
more interactive interface.
When using IR, an IR blaster must be connected to
the TV and placed in front of the device to be con-
trolled. The TV must then be configured so the
proper IR codes will be used.
Like previous versions of NetCommand,
an "IR Library" is loaded in the TV's soft-
ware so that most common devices can
be selected for immediate use. New for
NetCommand 3.0 is the "Learning" fea-
ture. For devices that are not included in
the IR Library, NetCommand can memo-
rize the IR code from that devices remote.
A series of menus walks the customer
through the learning process. Once
loaded, the TV can then control the de-
vice using the IR blaster. This makes
NetCommand almost 100% compatable
with all other IR controlled devices.
Figure 1: NetCommand Icons
Figure 2: FireWire Connection
Figure 3: IR Learning Menu

4
5 Format Memory Card Reader
Digital music and photography can now be enjoyed
in the home theater environment thanks to the
memory card reader featured in the V23 chassis.
When the user inserts a memory card into any one
of the four card reader slots on the front of the set,
NetCommand will take control, allowing a slide
show or giving a music play list.
The memory card formats supported are:
•Memory Stick™
•MultiMedia Card™
•SD (Secure Digital)
•SmartMedia™
•CompactFlash®
When a memory card is inserted into the correct slot,
an LED next to the slot will light up. Then, after the
slot is selected using the DEVICE button on the re-
mote, the Memory Card Screen, Figure 4, will be
automatically displayed.
An overview of remote push buttons and their func-
tions is given in Table 3. Other remote functions are
explained within the menus. Full instructions are
included in the Owner's Guide.
For Slideshow, press PLAY.
For Thumbnails, press GUIDE.
To redisplay this menu or to
setup, press DEVICE MENU.
For Playlist, press AUDIO
Figure 4: Memory Card Screen
Figure 5: JPEG Thumbnails
Figure 6: Audio Playlist
Figure 7: Media Setup
BUTTON
FUNCTION
VIDEO Switch from Audio Play List to JPEG Thumbnails (Figure 5)
AUDIO Switch from JPEG Thumbnails to Audio Playlist (Figure 6)
DEVICE
MENU Display the Media Setup Menu (Figure 7 )
PLAY Start the Slideshow or play audio
GUIDE Return to the Thumbnail menu or the Audio Playlist while in Play
PAUSE
Pauses or resumes playback
FF
Skips to the next slide or song
REW
Returns to the previous slide or song
STOP
Stops slide show or play and returns to Memory Card Screen
FORMAT
Rotates slide 90° each time it is pressed
Table 3: Remote Functions

5
Compatibility
Users having difficulties with the memory card reader
should be aware of the following requirements:
For JPEG Pictures up to 128mb:
1. Still images recorded using the Exchangable
Image File Format (EXIF) for digital still cam-
eras and Design Rules for Camera File Sys-
tems (DCF).
2. Standard digital images with a maximum size
of 5-megapixels (2560x1920).
3. File name maximum of 50 characters ending
with a .jpg extension.
For MP3 or WMA7 Audio files:
1. Files recorded with sampling rates of 32 KHz,
44.1 KHz or 48KHz.
2. Files recorded with fixed bit rates.
3. File names with .jpg or .wma extensions.
NOTES:
Images opened and resaved on a computer may
not playback or may not be able to display a
picture in the thumbnail list. This is because
the computer may change the file to an incom-
patible format.
For audio playback, the audio output from the
TV to the A/V receiver is analog. Digital au-
dio output is not available.
PerfectColor™
With conventional tint controls providing only a
tradeoff between red and green, PerfectColor was
developed to provide precise control over the 6 in-
dividual primary and secondary colors.
Introduced in the V20 Chassis, PerfectColor was
initially limited to 480i composite video sources only.
For the V22 and V23 chassis, PerfectColor can be
setup individually for each and every Input and is
compatible with all video source formats. (480i,
480p, 1080i)
A colorbar chart with slider controls is provided in
the menu for easy reference. See Figure 8.
PerfectColor can also provide automatic color cor-
rection. Compared to conventional “Auto Color”
systems, it can better sense and correct for color dif-
ferences when changing channels. It is specifically
designed for the customer that watches a wide range
of channels where no one setting can be used.
NOTE: Improperly set, PerfectColor can ex-
hibit a wide variety of color symptoms. These
symptoms will not affect the on-screen menus
or a black and white picture. In such instances,
be sure to check the PerfectColor settings prior
to troubleshooting.
Y
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W
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Y
A
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G
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N
M
A
G
E
N
T
A
R
E
D
B
L
U
E
Magenta (31):
Red (31):
Yellow (31):
Green (31):
Cyan (31):
Blue (31):
Figure 8: PerfectColor On-Screen Display

6
MonitorLink™
MonitorLink is a new digital interface introduced in
Mitsubishi's 2003-2004 model line, including the
V23 chassis.
MonitorLink provides a proprietary connection for
Mitsubishi's HD-5000, Monitor/Receiver, allowing
Mitsubishi's upgradeability promise to be fulfilled
using a digital, rather than analog, interface.
While MonitorLink is a proprietary connection, it
uses industry standard technologies that may pro-
vide even more versatility.
•RS-232C - Provides device communication
and control.
•Audio - Standard analog stereo connections.
•DVI - (Digital Visual Interface) Provides a
digital video connection.
RS-232C… The RS-232C connection interfaces
communications and control between the receiver/
controller and display. Commands such as Power
On, Input, Mute, etc., make the system operate as
one via the customer's remote control.
Audio… Analog Left and Right Audio connectors
are provided for the set's internal audio/speaker sys-
tem. The V23 chassis has digital audio outputs and
IEEE1394 for more advanced connections with an
external A/V receiver.
DVI… Technicians experienced with computer
monitors may already be familiar with DVI and its
features. However, because it is new to home the-
ater, it will be covered here further.
Digital Visual Interface (DVI)
DVI was originally designed by the Digital Display
Working Group (DDWG) to provide a universally
accepted digital connection between a PC and a dis-
play device.
At first glance, another digital interface would seem
unnecessary with the presence of IEEE1394,
Firewire. However, differences between IEEE1394
and DVI make them each suitable for different ap-
plications. A comparison of the two interfaces, as
applied to home theater, is provided in Table 4.
Simply stated, 1394's bi-directional, compressed
data, and AV control capabilities make it suited for
recording and networking between various devices.
DVI's high speed, full bandwidth capabilities make
it most suitable to connect a display device.
IEEE1394 DVI
Bi-directional interface (Record and Playback) One direction interface (One way to a display)
Networkable between multiple devices Single point-to-point.
Distributes Compressed Data (MPEG2) Uncompressed Data (High bit rate HDTV)
Supports A/V Commands (AV/C & HAVi) No AV Control capability
Copy Protection (5C) Copy Protection (HDCP)
Table 4
Figure 9: MonitorLink Input

7
Used with its optional copy protection scheme, DVI
makes it possible to view full resolution signals with-
out exposing the signal to copyright infringement.
It is the digital equivalent of component DTV con-
nections (Y,Pr,Pb) that can be configured for use in
a copy protected environment.
The DVI standard supports the following…
•Analog only interface (DVI-A)
•Digital only interface (DVI-D)
•Analog or Digital interface (DVI-I)
•Transition Minimized Differential Signaling
(TMDS)
•Display Data Channel (DDC)
•Extended Display Identification Data
(EDID)
•High-bandwidth Digital Content Protection
(HDCP)
•Hot Plug Detect (HPD)
•Digital Monitor Power Management
(DMPM)
A glossary of acronyms is provided in Table 5.
DVI-A, DVI-D, DVI-I
DVI can provide an analog link, DVI-A, or a digital
link, DVI-D. The integrated link, DVI-I, was de-
signed to support either. Each link has its own type
connector, covered later in this article. MonitorLink
uses digital only DVI, so the focus of the remainder
of this discussion will concentrate on the digital link.
DDC Display Data Channel
DDWG Digital Display Working Group
DMPM Digital Monitor Power Management
DVI-A Digital Visual Interface - Analog
DVI-D Digital Visual Interface - Digital
DVI-I Digital Visual Interface - Integrated (Digital or Analog)
EDID Extended Display Identification Data
HDCP High-bandwidth Digital Content Protection
TMDS Transistion Minimized Differential Signaling
VESA Video Electronics Standards Association
Acronyms
Table 5
Transition Minimized Differential Signaling
(TMDS)
TMDS is a method used to transmit digital data that
reduces the number of bit transitions (high to low or
low to high) occurring in the serial bit stream. To
reduce the transitions, it uses an advanced formula
(algorithm) that converts 8 bit data into 10 bit data.
Differential circuitry is then used to output compli-
mentary signals. The results are…
•Reduced Electromagnetic Interference
(EMI).
•Faster transfer rates with reduced errors.
•Ability to use twisted pair wire vs. coax.
A TMDS link consists of a TMDS Transmitter that
encodes and sends a data stream to a TMDS Receiver,
see Figure 10. Three sets of twisted pair wires carry
the Red, Green and Blue data. An additional twisted
pair carries the timing clock signal.
Because the bandwidth over copper wire is limited
to about 165 MHz, DVI can use up to two TMDS
links, or 6 channels sharing the same clock. DVI
with a dual-link TMDS has a bandwidth that is
doubled.
1080i HDTV, with a pixel rate of 1920 X 1080 at
30Hz can be supported by a DVI interface operating
in the single-link mode.

8
Display Data Channel (DDC)
The VESA standard Display Data Channel, shown
in Figure 10, is part of the DVI specification. It is
an I2C bus used for data communications between
the two devices. The data can include information
specifying the type of display device connected and
can also be used to support copy protection.
Figure 10: Single-Link TMDS
Extended Display Identification Data (EDID)
EDID is the VESA standard protocol used over the
DDC so the display device can communicate identi-
fication about itself to the host device. The data,
stored in memory in the display device, can include
its resolution, sync timing and refresh rates, etc. It
is part of the plug and play package.
Figure 11: HDCP

9
High-bandwidth Digital Content Protection
(HDCP)
HDCP is a system designed to protect the outputs of
a DVI device from being copied. The protection can
be applied in various ways.
•Unrestricted copies
•Limited number of copies
•Limited use of copies
•No copies
Since this is a optional element of DVI, both the host
device and the receiving device must be properly
equipped to function and provide the protected link
between them. There are three parts within the con-
tent protection scheme.
•Authentication… The host and receiver
exchange data to confirm the receiver is
authorized to receive the protected data.
•Encryption/Decryption… After the host
has verified the receiver, "keys" are provided
that will allow the receiver to decrypt the
data sent.
•Renewability… Each receiver is given both
a secret code and a non-secret identification
number. If the host determines the secret
keys have been tampered with, the receiver
is denied authentication.
The authentication process occurs over the DDC I2C
bus shown in Figure 11. After authentication, the
encrypted video data is applied to the TMDS encoder.
The encrypted data sent over the DVI interface is
then immune to "eavesdropping." Only the autho-
rized display device can reverse the encryption af-
terwards.
Hot Plug Detect (HPD)
Another part of the plug and play package is the
VESA standard Hot Plug Detect. A dedicated pin
on the DVI connector is used by the display to let
the host know it is plugged in. When the host de-
vice detects a High condition greater than 2.4 VDC
(typically 5.0 VDC), it will read the EDID and start
operation. If the potential falls below 2.0 VDC the
TMDS transmitter is stopped.
Digital Monitor Power Management (DMPM)
DMPM allows several different levels of power man-
agement by detecting the presence of EDID and/or
TMDS activity. One pin on the DVI connector is
provided so the host can supply a 5 V source. The
display has the option to use this supply to keep the
DDC capable while the monitor is off.
DVI Connectors
There two types of DVI receptacles shown in Fig-
ure 12, DVI-D and DVI-I. Pin assignments are de-
tailed in Table 6. It should be noted, the additional
pins, C1-C5, arranged in the + shape on the DVI-I
receptacle, are provided for analog signals. No DVI-
A connector is shown because DVI-A is generally
associated with adapting VGA connectors to DVI-I.
Figure 12: DVI Receptacles

10
PIN SIGNAL PIN SIGNAL
1TMDS Data 2- 16 Hot Plug Detect
2TMDS Data 2+ 17 TMDS Data 0-
3TMDS 2&4 Shield 18 TMDS Data 0+
4TMDS Data 4- (NA) 19 TMDS 0&5 Shield
5TMDS Data 4+ (NA) 20 TMDS Data 5- (NA)
6DDC Clock 21 TMDS Data 5+ (NA)
7DDC Data 22 TMDS Clock Shield
8Analog Vertical Sync (NA) 23 TMDS Clock+
9TMDS Data 1- 24 TMDS Clock-
10 TMDS Data 1+ C1 Analog Red (NA)
11 TMDS 1&3 Shield C2 Analog Green (NA)
12 TMDS Data 3- (NA) C3 Analog Blue (NA)
13 TMDS Data 3+ (NA) C4 Analog Horizontal Sync (NA)
14 +5.0 VDC C5 Analog Ground (NA)
15 Ground
Table 6
(NA) Not used by MonitorLink
MonitorLink DVI Connector
Some manufacturers use DVI-I connectors for DVI-
D only. This is the arrangement used by
MonitorLink. This configuration will not support
analog connections. Therefore, any attempt to in-
terface analog signals, no matter what form of DVI-
A or DVI-I cables or adaptors used, will not be suc-
cessful. Looking at the pin assignments in Table 6,
it should become obvious, the DVI-I connector used
by MonitorLink is a digital only, single-link TMDS
interface.
NOTE: V23 models are compliant with HDCP
and EIA861 standards for standard, extended
and high definition (480i, 480p, 1080i) video.
The DVI input is not intended for use with
personal computers or devices outputing video
signals with computer resolution.
DVI Input Block Diagram
Figure 13 is a block diagram of the DVI input cir-
cuitry used on the V23 Chassis. The circuitry will
be similar in other models.
Single-link TMDS Data and Clock signals are ap-
plied directly to IC2D00. Vcc for the EEPROM,
IC7AAA, is supplied by the host device via the DVI
connector, pin 14. At the same time, this potential is
fed back to pin 16 for Hot Plug Detection. The host
device communicates over the DDC bus directly with
the EEPROM to retrieve the EDID. IC2D02 is used
to convert the 5V I2C to 3.3V logic for compatibility
with IC2D00 where HDCP data is exchanged.
IC2D00 decodes and outputs analog RGB/H/V sig-
nals for selection by the TV input select circuitry.
Firewire is a trademark of Apple Computer, Inc.
DVI is a trademark of the Digital Display Working Group.
VESA, DDC and EDID are trademarks of the Video Electronics Standard
Association.
TMDS is a trademark of Silicone Image, Inc.
HDCP is a trademark of Digital Content Protection, LLC.

11
Figure 13: V23 Chassis DVI Input Block Diagram

12
Chassis Option Menu Adjustment Mode Convergence Mode OSD Position
VZ5/VZ6/V15
1-3-7-0 2-3-5-7 2-3-5-9 <6><5><4> Adjust Mode
VZ7/VZ8/V16
1-2-7-0 1-2-5-7 1-2-5-9 <6><5><4> Adjust Mode
V17
8-2-7-0 8-2-5-7 8-2-5-9 <6><5><4> Adjust Mode
VZ9/V18/V19
0-1-7-0 0-1-5-7 0-1-5-9 <6><5><4> Adj. Mode/0-1-8-8
V20/VK20
2-2-7-0 2-2-5-7 2-2-5-9 <6><5><4> Adjust Mode
V21
2-1-7-0 2-1-5-7 2-1-5-9 <6><5><4> 2-1-8-8
K20/V22/V23
0-3-7-0 0-3-5-7 0-3-5-9 <6><5><4> Adj. Mode/0-3-8-8
Service Menu Access Codes

1-1
Chapter 1
Disassembly and Service
Figure 1-1: Lightbox Removal - 48” Models
With 11 different models, mechanical features and
disassembly procedures vary in the V23. Since all
features and disassembly procedures are in the Ser-
vice Manual, this chapter will only provide a gen-
eral discussion.
The V23 has the following mechanical features:
•Removable Lightbox
•Two piece cabinet (65” & 73” models)
•Customer Removable DiamondShield™
•Composite Cabinet Back (V23+++)
Lightbox
Like previous Mitsubishi projection TV chassis, the
V23 is based on a modular design that allows the
“lightbox” to be removed for service. Even without
the front control panel, card reader or front inputs, it
is still fully functional by use of the remote control.
This allows easier access to test points, etc. And,
when “shop service” becomes necessary, this design
has several more benefits.
•No lifting of heavy, bulky cabinets
•No cabinet or screen damage.
•Less customer inconvenience.

1-2
The lightbox removal procedure for 48” V23 mod-
els is shown in Figure 1-1.
1. Remove the Back Board by removing 7
screws (a), 2 screws (b) and 8 screws (c).
2. Remove the Back Cover by removing 8
screws (d).
3Remove 4 screws (e) to remove the Board
Slide.
4. Remove 8 screws (f) to remove the Board
Shelves.
5. Remove screw (g) holding the chassis.
6. Remove 4 screws (h) securing the Light Box
Assembly.
7. Be certain that all cables and connectors
between the Light Box Assembly and exter-
nal items are disconnected (e.g. speaker
plugs, etc.), including the USB and IEE1394
connectors from the Card Reader to the DM.
8. Slide the Light Box Assembly from the
cabinet.
The procedure is similar for all models. The 48” ver-
sions do not require the removal of the black plastic
Back Cover. Refer to the Service Manual for spe-
cific disassembly instructions on all models.
NOTE: When V19, V21 and V23 models are
first plugged in, the front panel LED will flash
for about 1 minute indicating the “boot time”
required before the Power On command will
be recognized. In addition, V23 models have
a “Energy Mode,” If set to Low, the 1 minute
boot time does not start until after the Power
on command is given. If the lightbox is being
serviced without the front panel, no indication
of these requirements will be present.
Although not required, for the reasons noted, it is
usually better to have the front panel connected when
servicing the lightbox. If this is not possible, the
following power up sequence should be used:
1) Apply AC power.
2) Press the remote Power button once.
3) Wait 90 seconds.
4) If no response, press the Power button again.
5) Wait 90 seconds.
Main Chassis Removal
Refer to Figure 1-2 to remove the Main Chassis.
1. Undo the cable wire ties to the Front Panel,
Speakers, CRTs, etc.
2. Unplug the Card Reader USB and 1394
cables from the DM module.
2. Remove screw (a) securing the Main Chassis
[and screws (b) in models WS-55813 and
WS-65813] .
3. Release the Chassis Locks on each side of
the chassis.
4. Slide the Chassis out the rear of the unit.
5. Tilt upward to access the bottom of the main
chassis.
DM Replacement
Refer to Figure 1-3 to replace the DM assembly.
1. Unplug the Card Reader USB and 1394
cables from the DM module, and refer to the
Chassis Removal Procedure to slide the
chassis towards the rear of the set.
2. Remove screws (a), to remove the DM Rear
Panel, Step 1.
3. Remove screws (a) and (b) to remove the
DM Module Cover, Step 2.
3. Remove the E2P module from the original
DM and plug it into the replacement DM.
5. Plug the DM module securely into the PCB-
DTV-TUNER.
6. Check operation before installing the DM
Cover, Step 3.
• Insert insulation (cardboard) between the
Demodulator Ground Spring and the
DM.
• Plug the set in and check the operation.
• If O.K., unplug the set and install the
DM Cover.