Mitsubishi Electronics WS-65513, WS-48613, WS-55513, WS-48513 User Manual

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Projection Television Technical Training & Troubleshooting Manual

V23

ECHNICAL RAINING

T 2003

V23

WS-48513 WS-55513 WS-65513 WS-73513

V23+ V23++ V23+++

WS-48613 WS-65713 WS-55813 WS-55613 WS-73713 WS-65813 WS-65613

MITSUBISHI ELECTRIC

MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.

V23 Chassis Projection Television Technical Training & Troubleshooting Manual

ECHNICAL RAINING

T 2003

V23 CHASSIS

TECHNICAL TRAINING AND TROUBLESHOOTING MANUAL

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

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

Screen

Size

Introduction

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

Table 1: V23 Models

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 projection 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 features, 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

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

V23 Features

Feature Explaination

3rd Generation HDTV Receiver

NetCommand™ 3.0 Home Theater Control by Firewire or IR Five-Format Memory Card Reader For viewing JPEG digital photos and listening to

AMVP (Advanced Multimedia Video Processor) FireWire/IEEE1394 Digital 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.

Two-way Coaxial Speakers WS-55613 & WS-65613. Improved Audio.

ATSC and Unscrambled QAM Reception Greater Sensitivity

MP3 or WMA audio recordings. 8 Screen Formats, Improved Line Doubling and Noise Reduction

V23+ Features

(Additional Features)

Results in smaller electron beam.

V23++ Features

(Additional Features) 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.

V23+++ Features

(Additional Features) Contemporary Cabinet

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

High Gloss Black. Composite Back has Reduced Weight

Other Features

Table 2: Features

NetCommand 3.0

NetCommand allows most common home theater products to be connected and controlled by way of the TV's remote control by simply selecting onscreen 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 "plugand-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.

Figure 1: NetCommand Icons

When using IR, an IR blaster must be connected to the TV and placed in front of the device to be controlled. 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 software so that most common devices can be selected for immediate use. New for NetCommand 3.0 is the "Learning" feature. For devices that are not included in the IR Library, NetCommand can memorize 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 device using the IR blaster. This makes NetCommand almost 100% compatable with all other IR controlled devices.

Figure 2: FireWire Connection

Figure 3: IR Learning Menu

5 Format Memory Card Reader

BUTTON

FUNCTION

DEVICE

PAUSE

REW

STOP

FORMAT

Rotates slide 90° each time it is pressed

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 remote, the Memory Card Screen, Figure 4, will be automatically displayed.

For Slideshow, press PLAY. For Thumbnails, press GUIDE. To redisplay this menu or to setup, press DEVICE MENU.

For Playlist, press AUDIO

Figure 5: JPEG Thumbnails

Figure 6: Audio Playlist

Figure 4: Memory Card Screen

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.

VIDEO Switch from Audio Play List to JPEG Thumbnails (Figure 5) AUDIO Switch from JPEG Thumbnails to Audio Playlist (Figure 6)

PLAY Start the Slideshow or play audio

GUIDE Return to the Thumbnail menu or the Audio Playlist while in Play

Display the Media Setup Menu (Figure 7 )

Pauses or resumes playback Skips to the next slide or song Returns to the previous slide or song Stops slide show or play and returns to Memory Card Screen

Table 3: Remote Functions

Figure 7: Media Setup

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 cameras and Design Rules for Camera File Systems (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.

PerfectColor™

With conventional tint controls providing only a tradeoff between red and green, PerfectColor was developed to provide precise control over the 6 individual 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)

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 incompatible format.

For audio playback, the audio output from the TV to the A/V receiver is analog. Digital audio output is not available.

Magenta (31):

Red (31):

Yellow (31):

Green (31):

Cyan (31):

Blue (31):

A colorbar chart with slider controls is provided in the menu for easy reference. See Figure 8.

PerfectColor can also provide automatic color correction. Compared to conventional “Auto Color” systems, it can better sense and correct for color differences 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 exhibit 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.

G E L L

Y A

E E

E N T

R E

L U E

Figure 8: PerfectColor On-Screen Display

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 provide 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 system. The V23 chassis has digital audio outputs and IEEE1394 for more advanced connections with an external A/V receiver.

Figure 9: MonitorLink Input

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 display 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 applications. A comparison of the two interfaces, as applied to home theater, is provided in Table 4.

DVI… Technicians experienced with computer monitors may already be familiar with DVI and its features. However, because it is new to home theater, it will be covered here further.

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

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.

Acronyms

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

Table 5

Used with its optional copy protection scheme, DVI makes it possible to view full resolution signals without exposing the signal to copyright infringement. It is the digital equivalent of component DTV connections (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 designed 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.

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 complimentary 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.

Figure 10: Single-Link TMDS

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.

Extended Display Identification Data (EDID)

EDID is the VESA standard protocol used over the DDC so the display device can communicate identification 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

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 content 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 host know it is plugged in. When the host device 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 management 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 Figure 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 DVIA connector is shown because DVI-A is generally associated with adapting VGA connectors to DVI-I.

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 authorized display device can reverse the encryption afterwards.

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

Figure 12: DVI Receptacles

PIN SIGNAL PIN SIGNAL

1 TMDS Data 2- 16 Hot Plug Detect 2 TMDS Data 2+ 17 TMDS Data 03 TMDS 2&4 Shield 18 TMDS Data 0+ 4 TMDS Data 4- (NA) 19 TMDS 0&5 Shield 5 TMDS Data 4+ (NA) 20 TMDS Data 5- (NA) 6 DDC Clock 21 TMDS Data 5+ (NA) 7 DDC Data 22 TMDS Clock Shield 8 Analog Vertical Sync (NA) 23 TMDS Clock+

9 TMDS Data 1- 24 TMDS Clock10 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

(NA) Not used by MonitorLink

Table 6

MonitorLink DVI Connector

Some manufacturers use DVI-I connectors for DVID only. This is the arrangement used by MonitorLink. This configuration will not support analog connections. Therefore, any attempt to interface analog signals, no matter what form of DVIA or DVI-I cables or adaptors used, will not be successful. 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 circuitry used on the V23 Chassis. The circuitry will be similar in other models.

Single-link TMDS Data and Clock signals are applied 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 signals 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.

Figure 13: V23 Chassis DVI Input Block Diagram

VZ5/VZ6/V15

VZ7/VZ8/V16

V17

VZ9/V18/V19

V20/VK20

V21

K20/V22/V23

Chassis Option Menu Adjustment Mode Convergence Mode OSD Position

1-3-7-0 2-3-5-7 2-3-5-9 <6><5><4> Adjust Mode 1-2-7-0 1-2-5-7 1-2-5-9 <6><5><4> Adjust Mode 8-2-7-0 8-2-5-7 8-2-5-9 <6><5><4> Adjust Mode 0-1-7-0 0-1-5-7 0-1-5-9 <6><5><4> Adj. Mode/0-1-8-8 2-2-7-0 2-2-5-7 2-2-5-9 <6><5><4> Adjust Mode 2-1-7-0 2-1-5-7 2-1-5-9 <6><5><4> 2-1-8-8 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

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 Service Manual, this chapter will only provide a general 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.

1-1

The lightbox removal procedure for 48” V23 models 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).

3 Remove 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 external 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.

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.

The procedure is similar for all models. The 48” versions do not require the removal of the black plastic Back Cover. Refer to the Service Manual for specific 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:

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 PCBDTV-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.

1-2

Figure 1-2: Main Chassis Removal

TOP VIEWREAR VIEW TOP VIEW

Step 1 Step 2 Step 3

Figure 1-3: DM Replacement

1-3

Figure 1-4: PCB Locations

Figure 1-5: Main Component Locations

1-4

PCB-DTV Tuner DM PCB-MLINK PCB-Terminal PCB-Signal

IR Learning

NetCommand

DVI Decoder

A/V Inputs

Control uPC

NTSC Video

Convergence

Line Double

Enhancement)

(Corner Focus)

DM Interface IEEE1394 RS-232C Interface A/V Selection Tuning DTV Tuner Card Viewer 3D-Y/C VCJ & Demodulator OSD-Menus Interface Digital uPC Control Decoders Generator

PCB-Doubler PCB-SVM PCB-Power PCB-Main PCB-DBF

PIP-POP Scan Velocity Power Supplies Horizontal Defl. Dynamic Picture Format Modulation Audio Amp. Vertical Defl. Beam 3:2 Pull Down (Picture Edge Convergence Amps. High Voltage Forming

480i to 480p

Table 1-1: PCB Functions

PCB & Major Component Locations

PCB and major component locations are shown in Figures 1-4 and 1-5. The major circuit functions performed on each PCB is listed in Table 1-1.

Convergence IC Replacement

To maximize cooling efficiency, the Convergence Amplifier ICs, IC8C01 & IC8C02, are mounted as close to the back cover vents as possible. With the heat sink fins over the top of the IC, access for replacement is restricted. To simplify replacement use the following procedure to remove the heat sink.

1) Release the 2 spring clips from the rear (towards the front of the set) of the heat sink.

2) Remove the 3 mounting screws shown in Figure 1-6.

3) Remove the heat sink by gently prying the IC’s loose.

When reinstalling, please note:

• Overtightening the screws can strip the plastic threads in the chassis.

• Mounting clips should be firmly seated for proper heat transfer.

Figure 1-6: Convergence IC Removal

1-5

V23+++ Composite Cabinet Back

The WS-55813 and WS-65813 feature a unique cabinet similar to last year’s WS-65712. It has a composite cabinet back that offers several advantages.

• Rounded edges in the back have a modern appearance.

• Unit construction gives it high strength.

• Low Weight - The 55” version is about 50 lbs lighter and the 65” version is about 100 lbs lighter than comparable models!

The disassembly procedure for the cabinet front differs from conventional cabinets. Note how the Cosmetic Front Panel is removed. Refer to Figure 1-7.

1. Remove the Speaker Grille by pulling forward.

2. Remove 2 screws (a) securing the Cosmetic Front Panel.

3. Slide the Cosmetic Front Panel 1 inch to the right, then lift away from the TV.

4. Remove 6 screws (b) to remove the Board Front.

5. Unplug the LF connector.

6. Remove the 4 screws (c) securing the Screen Assembly.

7. Lift the Screen Assembly up and away from the cabinet.

Figure 1-7: V23+++ Cabinet Front Disassembly

1-6

Chapter 2

OPTION MENU

Alignment Procedures

With the exception of the Service Menu access codes, the general alignment procedures for the V23 chassis remains the same as previous HD chassis. A chart showing all recent Service Menu Access Codes is provided on page 12 of the Introduction. This chapter will give an overview of the following alignment procedures.

• Initial Setup - Option Menu

• Circuit Adjustment Mode

• Convergence Adjustment Mode

• Alignment Data Storage Locations

For specific alignments, refer to the Service Manual.

Initial Setup

Option Menu - Initial Setup

Prior to alignment, the procedures for initial setup should be followed so that all customer Main Menu and A/V settings are set to the factory defaults listed in Table 2-1 and Table 2-2.

Follow the steps below for the initial set-up:

1) Select the "MENU" display by pressing the "MENU" button once.

2) Press the number buttons "0", "3", "7", "0" in sequence to select the "OPTION MENU" display. See Figure 2-1.

3) Press the "ADJUST" button to select "INITIAL."

4) Press "ENTER." NOTE: At this time, all Main Menu and A/ V settings will be set to the factory default settings and channel 3 will be automatically selected.

(MENU-0-3-7-0)

Initial Power restore :OFF DTV Port :Auto

Figure 2-1: Option Menu

2-1

Audio

Edit Setup

Review

(v) Enabled

Video

(v) Enabled

Icon Position

(v) Enabled

Transport Menu

Energy Mode

Language

MAIN MENU DEFAULT SETTINGS

1/2/3

Compon.

1/2

1/2/3

1~4

Bass

Center

SETUP

Clock Setting Manual Volume 30%

Time 12:00 AM Bass 50% Antenna A Antenna B Input DTV Input 1 Input 2 Input 3 Component 1 Component 2 Antenna DTV VGA MonLink Card 1 Card 2 Card 3 Card 4

As above V-Violence Ant-A, Ant-B, Ant-DTV, ComFlash Program not Rated MemStick, SmartMed, MMC& SD Movie Rating PG Video Mute On Input-1, Input-2, Input-3, Comp-1, V-Chip Time Black Enhancement On Comp-2, Input DTV, VGA, Start Time 12:00 AM MonLink, Cards 1…4 Stop Time 12:00 AM Color Balance Manual

Standard Lock by Time Off

English Lock Time NA

ANTENNA

Antenna ANT A Front Button Lock Off PIP Position Lower Right Memorize Channels Air POP Position Right Half Channel Ch-3 A/V Memory Reset Ant-A PIP/POP Format 2 Window Memory Deleted Format Stretched

Day Monday Treble 50%

Analog Captions With Mute Surround Off Background Gray Listen to Stereo Digital Captions With Mute Level Sound Off Digital Settings TV Speakers On Appearance Default Audio 2 Out Main Digital Channel Guide Off

V-CHIP Off Brightness 50% TV Rating TV-PG Sharpness 50% FV-Fantasy Violence D-Sexual Dialog L-Adult Language S-Sexual Situation

On PerfectColor™ Centered

Unlock Time NA Source Ant A Ch 3

AUDIO/VIDEO SETTINGS

TIME

CAPTIONS

V-CHIP LOCK

Lock By Time

Balance 50%

Contrast 100%

Color 50% Tint 50% Color Temp. High Video Noise Standard Image Type Video VSM Sharpness On

Advanced

PIP/POP

Table 2-1: Main Menu Factory Defaults

A/V RESET DEFAULT SETTINGS (By Input)

A/V Memory Ant A/B Ant DTV Inp-DTV

Contrast Max. Max. Max. Max. Max. Max. Max. Max. Max. Brightness Center Center Center Center Center Center Center Center Center Sharpness Center Center Center Center Center N/A Center Center Center Color Center Center Center Center Center Center Center Center Center Tint Center Center Center Center Center Center Center Center Center Color Temp. High High High High High High High High High Video Noise Standard N/A Standard Standard Standard N/A N/A Standard N/A Image Type Video N/A Video Video Video N/A N/A Video N/A VSM Sharpness On On On On On On On On On

Treble Center Center Center Center Center Center Center Center Center Balance Center Center Center Center Center Center Center Center Center Surround OFF OFF OFF OFF OFF OFF OFF OFF OFF Listen To Stereo English N/A N/A N/A N/A N/A N/A N/A Level Sound OFF OFF OFF OFF OFF OFF OFF OFF OFF

INPUTS

VGA

1394

MonLink

Card

Table 2-2: A/V Default Settings

2-2

Circuit Adjustment Mode

Most of the adjustments can only be performed using the remote hand unit. See Figure 2-2. Many of the adjustments must be performed in both the 480i and 1080i modes. Video/Color adjustments must be performed in the 480i and 1080i modes, and data must be preset in the 480P (DVD) and VGA modes.

Note: Set the Remote Operational Mode to “NetCommand”. (Hold the “Power” button and press “9-3-5” in sequence.) This slows the remote’s response and makes adjustments easier. When adjustments are complete, set

the Remote to its’ original Operational Mode. (Hold the “Power” button and press

“0-0-0” in sequence)

Activating the Circuit Adjustment Mode

The current signal source determines if the activated Adjustment Mode is 480i or 1080i.

1. Select the signal source (480i or 1080i).

2. Press the "MENU" button on the remote

control so the Main Menu is displayed.

3. Press the number buttons "0", "3", "5", "7"

in sequence. The screen will change to the

Circuit Adjustment Mode. See Figure 2-3. Note: Repeat steps 2 and 3 if the circuit adjustment mode does not appear on screen.

Figure 2-2: Remote Control

CHASSIS V23

FUNCTION DECODER 1

ADJ ITEM 22 SCNT 16 480i SIGNAL

ABBREV. DATA

Figure 2-3: Circuit Adjustment Mode

2-3

Selection of adjustment Functions and

CRT-VC

CRT-JNGL

DECODER 2

DECODER 1

DOUBLER

Adjustment Items

To select an adjustment item in the circuit adjustment mode, first select the adjustment function that includes the specific adjustment item to be selected. Then select the adjustment item. Refer to the following pages for the listing of adjustment functions and adjustment items.

Adjustment Functions

Figure 2-4: Adjustment Functions

1) Press the "AUDIO" button on the remote hand unit to select an adjustment function. Each time the button is pressed, the Function changes in the sequence shown in Figure 2-4.

2) Press the “VIDEO” button to select a specific Adjustment Item. The Item number increases each time the “VIDEO” button is pressed.

Changing Data

After selecting an adjustment Item, use the “ADJUST UP/DOWN” buttons to change data.

• Press “ADJUST DOWN” to decrease the data value.

• Press “ADJUST UP” to increase the data value.

Saving Adjustment Data

Press “ENTER” to save adjustment data in memory. The character display turns red for approximately one second in this step.

Note: If the circuit adjustment mode is terminated without pressing “ENTER”, changes in adjustment data are not saved.

Terminating the Circuit Adjustment Mode

Press the “MENU” button on the remote hand unit twice to terminate the adjustment mode.

Note: The circuit adjustment mode can also be terminated by turning the power OFF.

Toggle Between Reception Modes

Pressing “3” when in the Adjustment Mode, CRTVC Function toggles between 480i, 480p, 1080i and VGA. However, data changes are not automatically saved. Press “ENTER” to save data before press- ing “3”.

NEW FEATURE… Service Mode Reset

To reset items in the Service Mode to their original factory adjusted values:

1) Press MENU-0-3-5-7 to enter the Service Mode.

2) Press “0-1-2-3,” in sequence to Reset to the Factory settings.

On Screen Display Position Adjustment Mode Activation

1) Select 480i or 1080i source.

2) Press MENU-0-3-8-8

2-4

Convergence Adjustment Mode

SD COARSE GREEN

0 HSTA

ITEM

ABREV

DATA

The Convergence mode is used to perform raster geometry correction and convergence adjustments.

These adjustments must be made in both the SD (NTSC 480i) and HD (1080i) modes.

Note: Before activating the Convergence

mode, turn “Video Mute” Off. The internal crosshatch pattern will not be displayed with “Video Mute” On, only a blue background is displayed.

Convergence Mode Activation

1. Press MENU-0-3-5-9

2. When the Convergence Mode is activated, this display appears on a Green Crosshatch. See Figure 2-5.

MODE FUNCTION SUB-FUNCTION

SD or HD

3. Activating the HD mode when no HD

signal is available

• Press the “DEVICE” button.

• Use the “UP-DOWN-RIGHT-LEFT” direction buttons to select ANT-DTV, then press “ENTER”.

• Press “MENU-0-3-9-5” in sequence to activate the Coarse Green HD Convergence mode.

Convergence Mode Functions

In the Convergence Mode there are three main Functions (Categories).

• Pressing “6” activates CONV MISC

• Pressing “5” activates COARSE CONV

• Pressing “4” activates FINE CONV

CONV MISC (Press 6) This mode is used to preset data values controlling the Convergence Generator, and to perform the HV Regulation adjustment.

1) Use the VIDEO button to select an item.

2) Use the ADJUST buttons to change data.

NO.

Figure 2-5: Convergence Mode

Selecting the HD or SD Mode

1. Select the Signal Source before entering the Convergence Mode, either an NTSC or HD source.

2. Enter the Convergence Mode

• If the signal source is NTSC, the SD mode is activated.

• If the signal source is HD, the HD mode is

activated.

NOTE: When Item “1 HVOL” is selected the screen goes black except for the data display. This occurs since a black screen is required when making the HV Regulation adjustment.

COARSE CONV (Press 5) There are four Sub Functions in the Coarse mode, COARSE GREEN, COARSE RED, COARSE BLUE and DF.

• COARSE GREEN .... used to make Coarse

Raster Geometry Adjustments.

• COARSE RED ... used to make Coarse Red Convergence Adjustments.

• COARSE BLUE ... used to make Coarse Blue Convergence Adjustments.

• DF ... used to preset data values controlling the Dynamic Beam Focus circuit drive signal.

2-5

1) Use AUDIO button to select a Sub

V23

CONV FINE

GREEN

V13

H-4

VERTICAL

HORIZ.

Function

2) Use the VIDEO button to select an Adjustment Item.

3) Use the ADJUST buttons to change data.

FINE CONV (Press 4) This mode is used to perform Fine Raster Correction, and Fine Red and Blue Convergence Adjustments. There are three Sub Adjustment Functions, selected with the AUDIO button:

• FINE GREEN .... a Green Crosshatch is

displayed, to make Fine Raster Corrections.

• FINE RED .... a White Crosshatch is dis-

played, to make Fine Red Convergence Adjustments.

• FINE BLUE .... a White Crosshatch is

displayed, to make Fine Blue Convergence Adjustments.

Figure 2-6: Fine Convergence Mode

In the Fine mode a Cursor is added to the Crosshatch. See Figure 2-6. The ENTER button toggles the Cursor between two modes:

• MOVE (blinking Cursor) .... use the AD-

JUST buttons to select any of 64 points on the Crosshatch.

• ADJUST (Non blinking Cursor) .... the

ADJUST buttons adjust the active color at the current Cursor position, horizontally or vertically.

The on-screen display changes in the Fine mode, as shown in Figure 2-7. The display shows the vertical and horizontal data for the current Cursor Position, and the horizontal and vertical coordinates for that position.

Saving Data and Exiting the Convergence Mode

Press MENU twice to exit the Convergence mode. Data is automatically saved at this time.

DATA

Figure 2-7: Fine Convergence

Alignment Data Storage Locations

Data accessed in the Convergence Adjustment Mode is stored in IC8D01 located on the PCB-Signal. Replacement PCB’s are supplied pre-aligned so that only fine adjustments should be necessary after replacement. All other service alignment data is stored on the PCB-E2P located on the DM assembly. When replacing the DM assembly, retaining the original PCB-E2P will minimize the need for any realignment.

2-6

Chapter 3

Power Supply

From the above diagram, it is apparent that the V23 Chassis has four Power Supply Operational Modes.

1) Low Energy Mode

2) Standard Standby Supply Mode.

3) Time Shift Recording Mode.

4) Conventional PTV On Mode.

Low Energy Mode

When the Low Energy Mode is activated the TV uses less than 3 Watts while the set is Off. The Low Power Standby Supply generates a 9VS supply. Three additional supplies are derived from the 9VS supply, 5VS,

3.3V-ES and 3.3VS-1.

These supplies furnish power for the PTV Control Circuitry. This is the only circuitry active in the Low Energy Mode when the PTV is Off.

In the Low Energy Mode the set is booted up each time the TV is switched On. When switched On, the LED will flash for approximately one minute before the TV powers On.

Low Energy Mode Activation

The Low Energy Mode is activated from the user's Onscreen Menus. To activate the Low Energy Mode:

1) Press "MENU".

2) Select the Setup Menu (Shown in Figure 3-1).

3) Use the Remote Direction Keys to activate, or deactivate the Low Energy Mode.

Low Energy Standby Regulator

Figure 3-2 illustrates the Low Energy Mode Regulator Circuitry. IC9A10 is the same is the same type of regulator used in the V20.

3-1

Figure 3-1: User Setup Menu

A 132 kHz internal Oscillator drives an internal Output FET. The signal from the FET at pin 5 of IC9A10, drives transformer T9A10. Signal from pin 10 of T9A10 is rectified, generating the 9VS supply.

The signal from pin 2 of the transformer is rectified and takes two paths:

1) To pin 1 of IC9A10, adding to an internally generated 6.3V supply.

2) Through R9A18 to the Standard Standby Regulator circuit, serving as a start-up voltage source.

For regulation a sample of the 9VS supply is fed back to pin 4 of IC9A10, via D9A14 and PC9A20.

Regulation

IC9A10 does not regulate by controlling the PWM of the oscillator signal. Under normal load, some of the 132 kHz cycles are removed and not applied to the FET. Under light loads, more of the cycles are removed, and during heavy loads few, if any cycles are removed. This is illustrated in Figure 3-3.

3-2

Low Energy Power Distribution

Figure 3-4 shows the Low Energy Mode Power Distribution. As stated earlier, the Low Energy 9VS is the source for the 5VS, 3.3V-ES and 3.3VS-1. The 5VS and 3.3VS-1 supplies power to the IC7A00 the PTV Control µPC.

The 3.3V-ES supplies power to the PTV Control circuit E2PROM, now located on the PCB-TERMINAL.

The 9VS supply also provides power for the Antenna Relay in the RF Switch.

3-3

Standard Standby Supply

The Standard Standby Regulator circuit is shown in Figure 3-5.

• When oscillation starts, the signal from pin 2 of T9A20 is rectified by D9A22 and added to the start-up voltage to maintain oscillation.

Start-up

The Start-up Voltage Supply is from R9A18 in the Low Energy Mode circuit, refer to Figure 3-2. The SUB- POWER command from the Control Circuitry activates the Standby Supply.

When SUB-POWER goes High:

• Q9A09 conducts, activating a Photo Coupler in PC9A20.

• The Photo Coupler turns Q9A12 On, supplying start-up voltage to pin 4 of IC9A20.

Regulation

The secondary 12VS supply is monitored for regulation. A sample of the 12VS is compared to a reference in IC9A21. A correction voltage from IC9A21 controls a second Optical Coupler in PC9A20.

The output of the Optical Coupler is applied to pin 5 of IC9A20, controlling the PWM of the oscillator's signal.

3-4

Standard Standby Supplies

Two Standby supplies are generated directly from T9A20, 12VS and 6VS. Both of these supplies are directed to the DM module, and are denoted as 12VDM and 6V-DM.

A 30VS supply is derived from the 12VS source using voltage doubler circuitry, comprised of D9A31, D9A32, C9A32 and C9A27. The resulting 30VS is the source for a 28V-DM supply.

Standby Power Distribution

Figure 3-6 illustrates the Standby Power Distribution. As mentioned earlier, the 12VS is source for 12VDM,and through the Voltage Doubler circuitry is the source for 30VS and 28-DM supplies. The 12VS is also directed to Horizontal Drive Circuitry and is the Start-up voltage source for the Switched Supply Regulator.

In addition to being the 6V-DM source, the 6VS supply supplies power for CRT Protect circuitry, and is the source for the 3.3V-1 and 5V-2 supplies.

Time Shift Recording Power

Supplies.

The Time Shift Record Supplies are switched supplies derived from the Standby 12VS supply. They are activated during Time Shift Recording and when the PTV is switched On. The Time Shift Power Supply circuit is shown if Figure 3-7.

The supply is activated by the PON-1 command from the Control Circuitry. When Off, the PON-1 line is low, holding Q921 On, which holds Q9A20 Off by pulling its Gate low.

3-5

When PON-1 goes High, Q9A21 turns Off, allowing Q9A20 to turn On. With Q9A20 conducting, the 12V supply is generated from the 12VS supply. The 12V supply enables IC9A22 and the 5V-1 supply is generated.

Time Shift Supply Power Distribution

Figure 3-8 illustrates the Power Distribution for the Time Shift supplies. The 5V-1 supply is used by the MLink, 3DYC and Signal Select circuitry. It is also the source for the 3.3V-2 supply, which is directed to the Conver-

3-6

gence Generator, 3DYC and Signal Select circuitry, and to IC2E65. IC2E65 generates 2.5 Volts for 3DYC.

The 12V supply provides power for Tuners and CRT Protect circuitry. It also is the source of four additional DC Supplies:

• 9V-1 for the Signal Select circuitry

• 5V-DECOD for the NTSC Decoders.

• 9V-2 for CRT Drive, MCS, Signal Select and Doubler circuitry.

• 5V-DAC for the Convergence DAC circuits.

Switched Supplies Regulator

Figure 3-9 shows the Switched Supplies Regulator. When the TV is switched On, both the PON-1 and PON-2 lines go High. When PON-2 goes High Q9A51 conducts:

1) Closing relay K9A50, shorting out current limiting resistor R9A02, refer to Figure 3-2.

2) Activating a Photo Coupler in PC9A50.

The Photo Coupler turns Q9A56 On, and start up voltage from the Standby Regulator is applied to pin 4 of IC9A50.

Signal from pin 3 of T9A50 is rectified by D9A44 and added to the start up voltage to maintain oscillation.

Regulation

Regulation is achieved by monitoring the 110V secondary supply, and through IC9A51 and PC9A50 a correction voltage is fed back to pin 1 of IC9A50. The voltage at pin 1 determines the PWM (duty cycle) of

3-7

the oscillator drive to the FET. The PWM is automatically changed to maintain a constant 110V source.

Five supplies are directly generated by signal from T9A50, 210V, 110V, 17V, +24V and -24V.

Troubleshooting

The most common symptom due to Power Supply problems is "The TV Will Not Turn On". The Flow Chart in Figure 3-11 may be of some help in isolating the cause of a "Won't Turn On Problem".

Power Distributions

Figure 3-10 shows the Switched Supplies Power Distribution. The 110V supplies power to DBF, Horizontal Drive, HV and SVM circuitry.

The +24 source supplies power to the Vertical Output, X-Protect and Convergence circuitry. It also generates the 12V-MAIN supply that is dedicated to HV Drive and Deflection Loss circuitry.

The -24V supply is used in the Convergence circuitry, and is the source for the -20V supply used in the CRT Drive circuitry. The 210V supply is also used in the CRT Drive circuits.

If the LED flashes:

• For 1 minute before the TV turns On:

This is normal, it takes about 1 minute for the circuitry to Boot Up. Boot Up occurs the first time the TV is plugged, and if in the Low Energy mode when the Power button is pressed.

• Flashes Continuously

It indicates the TV µPC is not functioning.

• Flashes-Stops-Flashes-Stops-etc.

It indicates a loss of communication between the TV µPC and the DM µPC.

3-8

If the LED does not flash:

• Check that the DM board is seated properly.

• Check that there is Standby 9VS (Fig. 3-2).

• Check that the SUB-POWER command line does not go High (Fig. 3-5).

• Chirping sound - check the Standby Regulator, IC9A20 (Fig.3-5).

• If it Turns On then Off

-Check the ±24V fuses

-Check Horizontal Deflection Circuitry.

3-9

3-10

Chapter 4

Control Circuitry

As in the two earlier integrated HDTV chassis, V19 and V21, the V23 uses two Microprocessors in the Control circuitry.

1) TV µPC … controlling the analog circuitry.

2) DM µPC … controlling the digital circuitry.

The two µPCs constantly communicate with each other. User commands are input to the TV µPC. Digital commands are forwarded from the TV µPC to the DM µPC. The TV µPC generates Control commands from two sources.:

1) User commands from the front panel or remote control

2) Commands from the DM µPC.

Even though circuitry is becoming more complex, the same basic requirements must be met for a µPC to operate.

Basic µPC Requirements

Figure 4-1 illustrates the four basic requirements for the TV µPC operation in the V23.

1) DC Supply … 3.3V-ES and 5VS.

2) Ground Returns … pins 8, 9 and 14.

3) Timing Signal … 15 mHz Clock Oscillator

4) Reset circuitry … sets the µPC to its nominal starting point

There is similar circuitry for the DM µPC. Since the DM Module is considered a replaceable component

4-1

we are not showing the details of the DM circuitry. Fig- ure 4-1 shows only the DC supplies and Reset signal going to the DM module.

Reset Circuitry

Figure 4-2 illustrates the Reset circuitry in more detail. The normal and Reset logic are shown in the diagram.

IC7C70 is the Reset IC. A Low from pin 1 resets the TV µPC. IC7C70 is a Watch Dog type of Reset IC that monitors the µPC’s operation. It has an internal counter that is continually reset by pulses from the µPC, input at pin 4 of the IC. If the µPC locks up, no pulses are generated. The counter reaches its maximum count and a reset pulse is output at pin 1 to reset the µPC.

4-2

Both the µPCs have the ability to reset each other if communication is lost. IC7C30 serves as a Reset interface between the two µPCs and the front panel Reset button. If the TV µPC gets no response from the DM, it outputs a High at pin 73 of IC7A00. The High is routed through IC7C30 and drives the DM-RESET input at pin 15 of the TC connector High.

Conversely, if the DM µPC gets no response from IC7A00, the DM outputs a Low at pin 18 of the VC connector. The Low, through IC7C30 activates a TV Reset pulse from IC7C70.

When the front panel recessed Reset button is pressed, both µPCs are reset through IC7C30.

IC7A00 also outputs reset pulses for the Convergence Generator, Audio Control, 3DYC and MLink circuitry.

Input Command Circuitry

Figure 4-3 illustrates the Command Input circuit. It is basically the same as that in the V19 and V21 so an in depth description is only necessary on those parts that are different.

The front panel Buttons are in a conventional resistive ladder configuration. Pressing a button changes the voltage at the KSC0 or KSC1 input of the µPC. The command is identified by the change in voltage at the KSC input.

There are differences in the Remote input circuitry due to the Remote Learning feature of the V23. As in previous models there are two Remote Preamps:

1) A conventional Mitsubishi Preamp.

2) A wideband Preamp amplifying the IR signals of most manufacturers.

4-3

IR signals from a Mitsubishi Remote are directed to the RMC input of IC7A00. The signals are filtered, processed and directed over the IR-IN-BUSY line to the SYS-5 µPC on PCB-DTV TUNER. If the SYS-5 circuitry is busy, it holds the IR-IN-BUSY line Low until it is clear to receive data.

If it is a Mitsubishi command the SYS-5 µPC directs it to the DM Module. The signal is processed and routed

back to the TV µPC over the DM-RXD line. If the commands are for a System 5 component they are directed to the SYS-5 IR Blaster Outputs.

Other manufacturers IR signals are amplified by the Wide Band Preamp, directed through IC7C50 to the Repeater IR Blaster Outputs. If IR signals are being output at that time the IR-OUT-EN line disables IC7C50 until the current IR output has ended.

4-4

Note that the output of the Wide Band Preamp (IR-IN) is also directed to the SYS-5 µPC. This connection was not used in the V19 and V21. It enables the Learning feature. The signals from the units Remote are memorized by the SYS-5 circuitry.

Serial Data Lines

Figure 4-4 shows the Serial Data lines and indicates what circuits they control. ICs IC7B00~IC7B03 are level shift ICs, changing the 3.3V data and clock lines from IC7A00 to 5V lines.

In previous sets the TV Control circuitry used two E2PROM Memory ICs, one on the PCB-SIGNAL and one on the PCB-TERMINAL. Due to the changes in design only one E2PROM is required, and for factory alignment purposes it is located on PCB-TERMINAL.

In the V23 the DTV Tuner and Modulator are separate from the DM Module. The DTV Tuner is controlled by the TDAT and TCLK lines from the DM Module. The DM Module also controls the MLink (DVI) circuitry, through the DVI-RXD and DVI-TXD lines.

Figure 4-4 also shows that the DM Module receives and processes the signals from the Card Reader.

µPC Parallel Inputs

The parallel inputs to the µPC are status inputs or signals inputs required for control purposes.

AC-OFF Input

Informs the µPC if AC Power is lost. The monitoring circuit is shown in Figure 4-5. Samples of the input AC are applied to the base of Q9A10. D9A16 removes the negative half of the sine waves. The remaining positive half cycles keep Q9A10 conducting. With Q9A10 conducting PC9A10 conducts, turning Q7A20 On. The conduction of Q7A20 holds the AC-OFF input to IC7A00 Low.

If AC power is lost, Q9A10, PC9A10 and Q7A20 all quit conducting, allowing pin 20 of IC7A00 to go High. This informs the Control circuitry power has been lost. The µPC responds by rapidly storing all user programming and service adjustments to memory. It also outputs a High on the Power Good line, informing the DM of the power loss.

4-5

SHORT Detect

IC7A00 Additional Inputs

Pin #

Name

Source

100

CV-IN-MAIN

Main Video (CCD, V-chip,etc)

The short Detect circuitry is shown in Figure 4-6 and is the same as in the V19 and V21 chassis. If a short occurs in the + or – 24V supplies, pin 46 on IC7A00 goes Low indicating a short and the TV shuts Off. With

-24V shorted, the 12VS supply turns Q9A53 On, pulling the SHORT line Low. If +24V is shorted D9A54 is forward biased and the short line goes Low.

X-RAY Protect

Refer to Figure 4-7, the X-Ray input is at pin 47 of IC7A00, and is normally High. The X-Ray Protect circuit monitors:

• Excessive HV

• Excess CRT Beam Current

• Excess HV circuit Current

If any of the preceeding occurs, the X-Ray line goes Low, and the TV shuts Off.

The monitoring circuits for X-ray Protect are described in the detail in the Deflection and HV Section. Other parallel inputs to the µPC, are listed in Table 4-1.

6 SD-SUB Sub Tuner Sync Detector

7 SD-MAIN Main Tuner Sync Detector 62 H-SYNC-IN ASIC Horizontal Sync 64 V-SYNC-IN ASIC Vertical Sync 92 AFT1 Main Tuner AFT voltage. 93 AFT2 Sub Tuner AFT voltage 94 VBLK Deflection Loss Detect circuit 97 CV-IN-SUB Sub Video (CCD, V-chip,etc)

Table 4-1: µPC Inputs

4-6

Additional IC7A00 Outputs

Pin #

Name

Purpose

42 BLNK-CRT Blanks CRTs during Input &Channel changes.

SUB POWER

Activates/Deactivates the Economy Mode

49 PON-2 Power ON: (Defl, Conv, HV, etc. circuitry) 50 PON-1 Power ON: Signal Processing circuitry) 51 BWC Band Width Control for Doubler Output 52 56 F31K Decreases H-Defl DC supply for 31.5 kHz. 57 DEFL-MUTE Decreases H-Defl DC supply during freq. change. 71 BLK-EN Enables OSD Insertion 76 MUTE SUB Mutes Sub Picture Audio Output 80 MUTE SPKR Mutes the TV's Speakers 82 POWERGOOD Informs the DM that the DC Power is ok 86 MUTE MON Mutes Monitor Out Audio

Sets the Free Run Horizontal Frequency

Table 4-2: µPC Outputs

Parallel Outputs

Most of the parallel outputs are listed in Table 4-2. Most of them have been used before and need no explanation. However, the function of two items should be described.

BWC (Band Width Control)

This line is directed to the Doubler circuitry, and automatically becomes active when the signal source is NTSC. The Doubler circuit is designed to produce the best possible picture for an HDTV signal. Due to this design, artifacts may appear in the picture when the signal source is NTSC.

With an NTSC source, the BWC line automatically goes High. The High reduces some of the high frequency output from the Doubler, removing the unwanted artifacts.

BLK-EN

Figure 4-8 illustrates the BLK-EN circuitry. The BLK-EN selects the path for the OSD insertion timing signal (DM-BLK). The OSD signals and the DM-BLK timing signal are generated in the DM Module.

directs the signal to the VCJ, and IC2V03 directs the signal to the Doubler circuit. The path of the DM-BLK signal is determined by BLK-EN from the TV µPC.

BLK-EN is applied directly to the OE (Output Enable) input of IC2V03, and is inverted by Q2X04 and applied to the OE input of IC2V02. IC2V02 and IC2V03 are enabled when their OE input GOES Low.

When EN-BLK is High, IC2V02 is enabled and the DM-BLK is directed to the VCJ. When EN-BLK is Low, DM-BLK is directed to the Doubler. DM-BLK is needed in Doubler, even though the OSD insertion for a DM signal occurs in the DM Module.

If the source signal is not from the DTV Tuner or a 1394 input, the OSD signal is inserted in the main signal in the VCJ IC2V01. The Timing Signal (DM-BLK) is applied to the inputs of IC2V02 and ICSVO3. IC2V02

4-7

The PerfectColor feature is performed in the Doubler circuit, therefore all signal sources must pass through the Doubler. With DM signal sources, any OSD is already inserted in the signal before it goes to the Doubler. The PerfectColor circuitry can cause incorrect color in the OSD. The DM-BLK signal is directed to the Doubler when the source is Digital, momentarily disabling the PerfectColor during the OSD.

Flash Circuit

Figure 4-9 shows the Flash Circuit in the V23. This circuit is not controlled by the µPCs, but can be consid-

ered a status sensor. It prevents a momentary flash on the screen:

• When the TV is switched Off (PON-1 goes Low)

• If AC power is lost. (AC-OFF goes High)

• If the +24V supply is lost (Q7C11 conducts)

If any of the above occurs, drive to the HV circuit is removed to prevent any flash on the screen. The Flash line goes High, turns On Q2V41, which removes HV Drive.

4-8

Chapter 5

Video/Color Circuitry

The above block diagram illustrates the Video/Color circuitry in the V23 chassis. Although initially it looks the same as in the V21, there are differences. The A/V Switch circuitry still selects main and sub picture signals from NTSC signal sources. Although it’s not apparent from the Block Diagram, the NTSC Decoders, Component Switch ICs, and the Doubler circuitry are different.

Note that all main picture sources, including the DTV Tuner, are processed by the Doubler circuitry. In the V21, 480p and DM signals only were processed by the

Doubler circuitry when a display other than Standard format was selected, or when PIP/POP was activated. The new improved Color Management (ColorPerfectTM) circuitry is in the Doubler circuitry and it now processes all signal sources. Therefore all signals must pass through the Doubler. Two additional signal sources are shown in the Block Diagram, MLink (DVI) Input, and a Memory Card Reader located in the front of the TV.

Also the diagram indicates that the Sub Picture source can only be from a NTSC source, an External Component Input or the DTV input.

5-1

PCB-TERMINAL Video Path

Figure 5-1 illustrates the Video Signal Path on the PCBTERMINAL. The AV-Switch circuitry has not changed, IC2L00 and IC2K00 are the same ICs used in the V21 chassis.

The 3DYC Motion Adaptive Come Filter provides a clean separation of luminance (Y) and chroma (C) signals.

The Main and Sub Decoders are new, generic #TA12440AF. Their functions include:

• Converting NTSC to YPbPr.

• Sync Separation

• Detecting signal format (480i, 480p, etc.)

• Converting RGB to YPbPr.

The Component Switch ICs are also new, generic # MM1519XQ. There are two Component Switch ICs on PCB-TERMINAL, and a third one on PCB-SIGNAL, not shown in Figure 5-1.

IC2A00 selects the Main and Sub picture sources from:

• Main Decoder output

• External Comp-1 Input

• External Comp-2 input

IC2B00 selects the Main and Sub picture sources from:

• The outputs of IC2A00

• The External DTV Inputs

• The VGA Input

The VGA Input cannot be selected as the Sub picture source.

5-2

The Sub picture signals from IC2B00 are directed to IC2G00, the Sub Decoder. Switch circuitry in IC2G00 selects Sub picture signals from IC2B00 or the AVSW(2), IC2K00.

or the MLINK signal from the MLINK Decoder, or the RGB signal from the DM Module. The output of IC2H01 is applied to the Main Picture inputs to the Doubler circuit.

As in previous chassis, the main and sub selected YPbPr signal are direct to the PCB-SIGNAL.

PCB-SIGNAL Video Path

Figure 5-2 shows the PCB-SIGNAL Video Signal Path. Sub picture signals from PCB-TERMINAL are routed directly to the Sub YPbPr inputs of PCB-DOUBLER.

The main picture signals from PCB-TERMINAL are routed to COMP SW-3, IC2H01. IC2H01 selects the main signal from the PCB-TERMINAL main outputs,

Note that the OSD RGB signals from the DM Module are also directed the VCJ, IC2V01.

On-Screen Display (OSD) signals are generated in the DM Module, and when the signal source is not the DM, OSD is inserted in the main picture in the VCJ. If the source is from the DM, the DTV Tuner or 1394 inputs, OSD insertion occurs in the DM module.

The diagram also shows that Convergence OSD signals are applied to the VCJ and inserted in the VCJ.

5-3

The outputs of the Doubler circuit, ASIC-Y, ASIC-Pb and ASIC-Pr are directed to the VCJ. The signals are processed in the VCJ and CRT RGB drive signals are output at pins 64, 63, and 62.

CRT Drive & Protect Circuitry

Figure 5-3 shows the CRT Drive circuitry. Since it is the same as that in the V21, no explanation is necessary. The CRT Protection circuitry is also the same as the V21, but a review may be in order.

When Q2W03 conducts, it turn On Q2W05, Q2W08 and Q2W11. The conduction of the three transistors removes RGB drive to the CRTS.

The conduction of Q2W03 is controlled from two sources:

1) The BLANK-CRT command from the µPC, momentarily blanking the CRTs during channel or input selection changes.

2) The VBLNK line. The logic on the VBLNK line is controlled by Deflection Loss Detection circuitry.

A High on VBLNK blanks the CRTs. The Deflection Loss Detection circuitry is discussed in detail in the Section on Deflection and HV.

5-4

Digital Signal Path

The basic Digital Signal path was shown in Figure 5-2. Figure 5-4 shows the Digital Path in more detail. Digi-

tal signal sources are the DTV/AQM Tuner, 1394 Inputs and the front panel Card Reader. There are two 1394 inputs at the rear of the DM module. A third 1394 input is on the front of the Card Reader. The Card Reader serves as a feed through for the 1394 signals and does not process these signals at all.

The I.F. signal from the DTV/QAM Tuner is directed to PCB-DEMODULATOR. The I.F. signal passes through two SAW filters, and two I.F. amp ICs, SF5200, IC5252, SF5201 and IC5253, in that order.

The (+) and (-) I.F. signals from IC5253 are directed to pin 69 and 68 of the Demodulator, IC52A0. The out-

put of the Demodulator is the Transport data stream used to modulate the carrier at the station.

The Transport Data Stream (TODATA) is directed to the Digital Module. The signal is processed by the circuitry in the DM, and results in analog RGB signals output at pins 8, 4, and 6 of the VA connector.

Signals from the 1394 inputs are processed in the DM Digital Signal Processing circuitry and are output as analog RGB signals at VA connector.

Signals from the Card Reader are send to the DM over a USB cable. The DM also processes these signals and outputs the resulting analog RGB signals.

5-5

Monitor Out Circuit

Figure 5-5 shows that the Monitor Output signal source is limited to an NTSC source, or the DM Module. The NTSC Y and C signals from the 3DYC Comb Filter, are directed back to IC2L00. IC2L00 directs the signals to the monitor Inputs of IC2K00. IC2K00 selects

the signal from IC2L00 or the DM signal input at pins 24 and 26 of IC2K00.

If the signal source is from a Component Input, the DTV Input, VGA Input or MLINK Input, no signal is available at the Monitor Outputs.

5-6

Chapter 6

Sync, Deflection & High Voltage

The Overall Sync, Deflection and Hign Voltage circuitry in the V23 is shown in the Block Diagram at the top of the page. The V23 can display either of two scanning formats, 480p or 1080i. The horizontal scanning frequency for 480p is 31.5 kHz, and 1080i is 33.75 kHz.

Conventional 480i TV signals have a scanning rate of 15.75 kHz. For these signals, line doubling circuitry changes the signal format from 480i to 480p.

In NTSC and Component format signals, horizontal and vertical sync must be extracted from the Y signal by the NTSC Decoder. For the DTV Input, the signal can be either Y,Pr,Pb or RGB/HV, sometimes referred to as “5-wire.” (Sync on green is no longer an option.) Obviously all 5-wire inputs have separate horizontal and vertical sync.

Sync Select circuitry selects the Main picture sync source. The selected output is used to synchronize the Horizontal and Vertical Deflection Generators. If the source signal is 480i, horizontal sync is doubled, before synchronizing the Horizontal Drive Generator.

Horizontal deflection drive is amplified by the Horizontal Output circuitry and directed to the horizontal windings in the Deflection Yokes. The signal from the Horizontal Output is also directed to HV Drive circuitry. HV Drive is amplified at directed to the Flyback transformer.

Vertical sync synchronizes the Vertical Deflection Generator. Output from the Vertical Generator is amplified in the Vertical Output circuitry and directed to the vertical windings in the Deflection Yokes.

6-1

Sync Signal Path

Figure 6-1 illustrates the Sync Signal Path for the Main Picture signals on the PCB-Terminal. IC2K00, IC2A00, IC2B00 and IC2A95 comprise the Main Picture Sync Select Circuitry. Sync must be extracted from NTSC, Composite and Component Format Y Signals. NTSC and Composite signals are 480i scanning format. Component signals can be 480i, 480p or 1080i.

IC2F00, the Main NTSC Decoder, extracts horizontal and vertical sync when the source signal is composite or component video.

IC2A95 selects the already seperate vertical and horizontal sync from the 5-wire sources.

• DTV (when the source is 5-wire)

• VGA

• DVI (decoded from the digital signal)

• DM (also decoded from a digital signal)

The selected sync is directed to the PCB-Signal via connector JA, pins 32 and 33, and then to the Doubler circuitry.

6-2

Figure 6-2 illustrates the Sub Sync Signal Path for the Sub-Picture signals on the PCB-Terminal. It functions the same as the Main Sync Signal Path using different pin sets on the same ICs. The sub sync signals are used by Doubler circuitry for POP/ PIP signal processing.

Figure 6-3 shows the sync signal functions performed by the PCN-Signal. It serves to interface the sync signals as follows:

• DVI and DM inputs to the PCB-Terminal

• Selected Main and Sub sync signals from the Terminal to the Doubler PCBs.

• Sync from the doubler to the VCJ

The selected sync is directed to the Doubler circuitry. If the selected source is 480i, the number of horizontal lines are doubled. When the selected source is 480p or 1080i, no line doubling is required. However, since all sync signals, 480i, 480p and 1080i pass through the PCB-DOUBLER, the TV cannot be operated with the PCB-DOUBLER unplugged.

IC2X10 and IC2X11 are flip-flops serving as schmitt triggers. They effectively remove any spikes or noise that may be riding on the sync, preventing false triggering.

6-3

From the flip-flops, sync pulses are directed to the VCJ, IC2V01. Both Horizontal and Vertical Drive Generators are in the VCJ. Horizontal drive is out-

put at pin 40, and vertical drive is output at pins 52 and 53. The signals are directed to their respective output circuitry on the PCB-MAIN.

6-4

Vertical Deflection

Figure 6-4 shows the Vertical Deflection circuitry. The Vertical Deflection Generator in the VCJ outputs push-pull type of vertical deflection drive signal. +VDR at pin 53 and –VDR atz pin 52. Both signals are applied to the Vertical Output IC, IC4B01. The amplified output from IC4B01 is directed to the vertical coils in the Deflection Yokes.

D4B01 and C4B04 make up the pump-up circuitry.

Feedback from the Deflection Yokes ground return at pin 4 of DY, to pin 1 of IC4B01, provide linearity and S correction.

Horizontal Deflection

Figure 6-4 illustrates the Horizontal Deflection Drive and Output circuitry. Horizontal drive signal from the VCJ is amplified by Horizontal Drive circuitry including transistors Q2V40, Q5A40, Q5A33, Q5A39 and Q5A32.

The output from Q5A32 is directed to Q5A31, the Horizontal Output transistor. The output from Q5A31 takes three paths:

1) To the horizontal windings in the Deflection Yokes

2) Through C5A34 and Q5A37 to the HV Drive circuitry.

3) Through T5A31, providing the source for the CRT filament supply.

6-5

Horizontal Deflection DC Supply Circuitry

The DC supplies for Q5A32 and Q5A31 are derived from Horizontal Deflection DC Supply circuitry. The 31K line from the Control µPC controls the DC voltage for Q5A31. Q5A31 supply voltage is approximately 10 volts higher for the 33.75 kHz scan format (1080i), than that for the 31.5 kHz scan (480p),

The H-Deflection DC Supply circuitry is also used to:

• Add side pincushion correction, controlled by the EWDRV signal from the VCJ.

• Reduce the Deflection DC supply during scanning frequency changes.

Figure 6-6 shows the Horizontal Deflection DC Supply circuitry. The conduction of Q5A01 determines the value of the DC Supply for the Horizontal Output Transistor, Q5A31.

The conduction of Q5A01 is controlled by Q5A06, Q5A05, Q5A03 and Q5A02. EWDRV signal is applied to the base of Q5A06 for Side Pincushion Correction.

When the base voltage of Q5A06 decreases, Q5A01 conducts less, lowering the Horizontal Output DC supply. When is the 31.5 kHz scan mode, the 31K line from the µPC goes High. The High drives Q5A07 into conduction, reducing the base voltage of Q5A06, which reduces the DC supply to the Horizontal Output.

6-6

The DEFL-MUTE line from the µPC and Q5A08 reduce the DC supply during scan frequency change by the same method.

The DC supply for the Horizontal Drive transistor, Q5A32, is derived from the Horizontal Output DC supply through R5A36, R5A37 and Q5A34. In the

31.5 kHz mode, the DC supply for Q5A32 would drop, since the supply for Q5A31 decreases.

To prevent this the 31K control line also connects to the base of Q5A35. When Q5A35 is driven into conduction, the conduction of Q5A34 is increased to maintain the DC supply for Q5A32.

Deflection Loss Detection

To prevent damage to the CRTs, the TV must shut Off if deflection is lost. The Deflection Loss Detection circuit is similar to previous models, as shown in Figure 6-7.

Q4B01 monitors vertical deflection, and Q5A38 monitors horizontal deflection. The conduction of both transistors holds their respective collector voltage below the forward bias point of the diode in their collector circuit's (D4B04 or D5A12).

If either Q4B01 or Q5A38 stop conducting, indicating a loss of deflection, the increase in that transistor’s collector voltage drives the V-Blank line High. The V-Blank line goes to the CRT Protect circuitry and immediately removing all drive to the CRTs.

6-7

HV & HV Regulation

Figure 6-8 illustrates the HV and HV Regulation circuitry. Drive from the Horizontal Deflection Output circuitry is applied the HD-IN input of IC5A00. IC5A00 amplifies the signal which is output at pin 1, and through Q5A07 and Q5A09, is applied to the gate of Q5A51.

The output of Q5A51 is the drive signal for the Flyback transformer, T5A51. In the Flyback, the signals are stepped up and rectified to generate the HV and Focus voltages for the three CRTs.

The amount of HV generated depends of the conduction time of Q5A51, the longer the conduction time the more energy supplied to the Flyback, and HV increases. HV is regulated by controlling the duty cycle of the drive signal to Q5A31.

A sample of the HV, HV-DC-FB, is derived from an internal resistive divider in the Flyback and is output at pin 13. The HV sample is applied to the noninverting input of an OP-Amp in IC5A01. The HV ADJ voltage in applied to the inverting input of a second OP-Amp in IC5A01. The outputs of both OP-Amps are combined and directed to pin 4 of IC5A00.

6-8

DO NOT measure the HV-DC-FB voltage at pin 13 of the T5A51. The meter may load down the internal resistive divider, resulting in excessive HV.

X-Ray Protect

X-Ray Protect circuitry is the basically the same as in previous models, as shown in Figure 5. The XRay Protect circuit in the V20 monitors three items:

1) Q5A51 (HV Output) current, by monitoring Q5A51 source voltage.

2) Excessive HV, by monitoring the rectified voltage from D5A57.

3) Excessive CRT Beam current, by monitoring the voltage at pin 8 for T5A51.

Each of the monitored sources is applied to an input of an OP-Amp in IC5A02. The second input of each OP-Amp is connected to a specific reference. The outputs of all three Op-Amps are tied together at the X-Ray line.

The X-Ray line is normally High. If any of the monitored sources exceeds its’ specific reference the XRay line is pulled Low, shutting Off the TV.

The connection from the source of Q5A51 to pin 5 of IC5A00 provides further protection. If the source voltage becomes excessive (excess current), IC5A00 immediately removes all drive to Q5A51.

6-9

Q5A20 and its associated circuitry comprise an Arc Protect circuit. If a CRT Arcs this circuitry immediately removes HV Drive.

If X-Ray Protect shuts the TV Off, pressing the Power button will turn the TV back On (it may shut Off again if the problem still exists). If Arc Protect is activated, the TV must be switched Off before it can be switched back On.

6-10

Chapter 7

Convergence Circuitry

Figure 7-1: Convergence Circuitry - Overall Block Diagram

The Overall Block Diagram in Figure 7-1 shows the the V23 Convergence Circuitry.. A Waveform Generator generates the convergence correction signals timed from horizontal and vertical sync pulses. The correction signals from the Waveform Generator are in a serial digital format.

The following Digital/Analog Converter changes the digital signals to analog signals. The analog signals from the D/A Converter are directed LPF (Low Pass Filter) and Summing Amplifiers. Any remaining high frequency digital signals are removed and the analog correction signals are amplified. Green correction signals are added to the red and blue signals in the Amplifiers, hence the name Summing Amplifiers.

The correction signals are amplified by Output Amplifiers and are directed to the sub coils in their respective Deflection Yokes.

This is the same basic circuitry used in the last few chassis types. There are only two major differences in V23 Convergence circuitry compared to that in the V21.

1) In the V23, the Waveform Generator is on the PCB-SIGNAL, not on a separate plug-in PCB.

2) Two Convergence Output ICs are used in the V23, only one was used in the V19.

7-1

Figure 7-2: Convergence Waveform Generator & D/A Converter

Waveform Generator & D/A

Converter

Figure 7-2 illustrates the Convergence Waveform Generator and Digital/Analog Converter circuitry. Horizontal Sync from the doubler circuitry is applied to pin 34 of IC8D00. Vertical Sync is applied to pin

27. From these two signals, IC8D00 generates six Convergence Correction signals, consisting of horizontal and vertical correction signals for each CRT.

Correction signals from IC8D00 are converted to analog signals in IC8E03 and are then directed to LPF and Summing Amplifiers.

Convergence Control signals are also shown in Fig- ure 7-2. These include:

• C-SCL … Serial Clock

• C-SDA … I2C Data line

• C-MUTE … disables the Convergence circuitry when the set is first powered on,

off, and when exiting the convergence mode (when data is stored in memory).

• C-BUSY … Allows IC8D00 to notify the µPC if it is busy.

• C-ACK … Acknowledgment line, allows notification to the µPC that a command was received.

• C—RST … Convergence Reset

IC8D00 also generates the signals for the internal crosshatch pattern. These are the C-OSDR, C-OSDG and C-OSDB signals that are directed to the VCJ. The C-BLK signal from IC8D00 times the crosshatch pattern insertion in the picture.

Two additional signals from IC8D00 are HV-ADJ and DF. HV-ADJ is set by the service HV adjustment and is directed to the HV Regulation circuitry. DF (Dynamic Focus) is a parabolic signal used by the DBF (Dynamic Beam Focus Circuitry).

7-2

Figure 7-3: Low Pass Filter and Summing Amplifiers

LPF & Summing Amps

Figure 7-3 illustrates the LPF and Summing Amplifiers. The circuitry consists of three ICs, IC8E00, IC8E01 and IC8E02. Each correction signal from IC8D00 goes through two stages of amplification:

1) The first stage is part of the LPF.

2) The second stage is the Summing Amplifier.

Green horizontal and vertical correction signals are added to the Red and Blue Summing Amplifier inputs.

7-3

Figure 7-4: Convergence Output Circuitry

Convergence Output Circuitry

Figure 7-4 shows the Convergence Output circuitry located on the PCB-Power. The correction signals

are amplified and directed to the Sub Vertical and Sub Horizontal coils located within their respective red, green and blue Deflection Yokes.

7-4

Chapter 8

Sound Circuitry

Figure 8-1: Sound Circuitry - Overall Block Diagram

The V23 Sound Circuitry is shown above in the Overall Block Diagram, Figure 8-1.

The Sound Source Select circuitry selects the sound source for both the main and sub pictures. The sources correspond to the Video Inputs:

• Main Tuner

• Sub Tuner (monaural only)

• Three External NTSC Inputs

• Two Component Inputs (DVD)

• DTV

• DVI

• VGA

• DM (Analog Audio from a digital source)

The sound signal from the DM Module is initially received in a digital format, from the ATSC/QAM Tuner or the IEEE 1394 inputs.

The remainder of the circuitry is conventional:

• MCS Decoder circuitry decodes the Main Tuner sound signal, generating mono, stereo, or SAP signals when broadcast.

• Main picture sound from the Select circuitry takes two paths:

1) To Audio Control circuitry

2) To the Monitor Outputs

• The Audio Control circuitry performs adjustments to the Volume, Treble, Bass, etc. The outputs from Audio Control circuit are directed to the Audio Amplifier, and then to the set’s speakers.

• Sub picture (PIP) sound, from the Source Select circuit is directed to the PIP Sound Output Jacks.

8-1

Figure 8-2: Overall Sound Circuitry Block Diagram

8-2

Overall Sound Signal Path

Figure 8-2 illustrates the Overall Sound Circuitry Block Diagram. The AV/SW ICs, IC2L00 and IC2K00, used to select Main and Sub Picture Video/ Color are also used to the select the Sound sources.

IC2L00 selects Main and Sub sound sources from the Main Tuner (decoded by MCS circuitry in IC3A01), Sub Tuner, External NTSC Inputs 1-3 and from Component Inputs 1 and 2. The selected signals are directed to IC2K00.

IC2K00 selects the signals from either IC2L00, DVI, DTV, VGA Inputs or the DM Module.

The Sub (PIP) sound signal is routed from IC2K00 to the PIP Sound Output Jacks. The selected main Sound signal is directed to Audio Control circuitry, also in IC3A01. The sound signal from IC3A01 is amplified in IC3E01 and directed to the speakers.

Digital Audio Output

There is one additional audio output signal in the V23 chassis, External Digital Audio Output on the rear of the DM. This is an AC-3 digital data stream (when available from a digital source). It allows connection to an external A/V Receiver with an AC-3 Decoder. If the signal has been fully encoded, the AC-3 Decoder is capable of producing 5.1 surround sound, 5 full audio channels (20 kHz) and one low frequency enhancement channel (120 Hz).

The input signals to IC3A01 are also directed to the Monitor Output Jacks. Only fixed level sound is available at the Monitor Output Jacks.

8-3

8-4

Chapter 9

LED Indications

Conditions

Probable Cause

Troubleshooting Tips

Off After AC is applied No Standby Power or TV µPC not running Fast Blink for 70 sec. After AC is applied Normal - DM µPC is booting up. Fast Blink for 70 sec. Each time TV is switched On Power Save Mode is activated

Fast Blink (Doesn't stop) After AC is applied TV µPC is running, but DM failed to boot up

Slow Blink Set is Off Normal - Timer is set for Auto Turn On

Table 9-1: Power LED Indications

Use the following tips when troubleshooting the source of a problem in the V23 chassis.

Using The Front Panel LED

The Front Panel LED helps isolate the cause of the following problems.

• The TV will not turn On.

• The TV turns On, and then Shuts Off.

If the TV will not turn On, the LED response indicates the possible cause of the problem. Table 9-1 lists the possible LED response when this problem occurs.

When the TV turns On and then shuts Off, the LED Diagnostic Error codes help isolate the problem. This is the same LED Diagnostic featured on some previous model TVs.

Figure 9-1 shows the LED Error Code Activation Procedure, an is describe in the following:

1) With the TV Off

2) Press and hold the front panel "MENU" and "DEVICE" buttons for 5 seconds.

3) The LED will flash the Error Code indicating what caused the TV to shut Off.

4) The Error Code will be repeated 5 times.

5) When the LED stops flashing the mode is automatically terminated.

Reading the Error Codes

The Error Codes are two digit numbers. The LED:

• Flashes the value of the most significant digit (MSD).

• Then there is a pause.

• Flashes the value of the least significant digit (LSD).

• The Error Code is repeated 5 times.

As an example, Figure 9-2 illustrates the LED drive for Error Code "23". Table 9-2 lists the Error Codes

and their possible cause.

9-1

DM Module Check

When the TV turns On, but a problem exists that may be caused by the DM Module, perform the following two checks:

1) Select the DTV Antenna as the source an select and HD Channel.

2) Select an analog 480i signal as the source and note if an On Screen Display (OSD) is present.

The ability to display Menus and receive an HD channel indicates the DM Assembly is functioning properly.

Except for the convergence crosshatch, all OSD signals are generated in the DM Module. When there is no OSD using a 480i source, the DM assembly may be the cause of the problem. However, before condemning the DM, make certain it is properly seated onto the PCB-DTV TUNER and that all connections between the PCB-DTV TUNER and PCB-SIGNAL are secure.

Error Code Probable Cause

12 No error detected 21 X-Ray Protect 22 Short Protect 23 Loss of Deflection

Table 9-2: Error Codes

trol may not be in the NetCommand Operational Mode. To put the Remote in the NetCommand Mode:

1) Set the Remote to the TV Layer.

2) Point the Remote away from the TV.

3) Press and Hold the "POWER" button and enter "9-3-5" in sequence.

CRT Phosphor Protection

Troubleshooting problems in the CRT Protect, Deflection Loss Detection and the Deflection circuits, sometimes involves disabling the CRT Protect circuitry and then Powering up the TV.

However, first disable the CRTs to prevent any possible phosphor damage.

1) Unplug the SP connector at the PCBCRT(R). This removes the filament voltage to all three CRTs.

2) Remove zener diode D5A13 on PCB-MAIN. This disables the CRT Protect circuit.

The set then can be switched on for troubleshooting without damaging CRT phosphors.

NetCommandTM Control Problems

If devices in a Home Theater System cannot be controlled properly with NetCommand, the Remote Con-

9-2

9351 Jeronimo Road • Irvine, CA 92618-1904

T/M V23

Mitsubishi Electronics WS-65513, WS-48613, WS-55513, WS-48513 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

TABLE of CONTENTS

Service Menu Access Codes