Mitsubishi Electric VS-50111 Manuel utilisateur

Technical Training and

Troubleshooting Guide

2002

ECHNICAL

RAINING

www.mitsubishi-tv.com

V20

Chassis

V20

Chassis

V20A Chassis V20C Chassis V20C+ Chassis

VS-50111 WS-48311 WS-55411

VS-60111 WS-55311 WS-65411

WS-65311 WS-73411

Digital Ready

Projection Television

MITSUBISHI ELECTRIC

MITSUBISHI DIGITAL ELECTRONICS AMERICA, INC.

V20 Chassis

Technical Training and Troubleshooting Guide

Table of Contents

Introduction ................................................................................................................................................. i

Chapter 1 -- Chassis Layout & Servicing .............................................................................................. 1-1

Chapter 2 -- Adjustments ....................................................................................................................... 2-1

Chapter 3 -- Power Supply ...................................................................................................................... 3-1

Chapter 4 -- Control Circuitry ................................................................................................................ 4-1

Chapter 5 -- Video/Color Circuitry ......................................................................................................... 5-1

Chapter 6 -- Deflection and High Voltage Circuitry ............................................................................. 6-1

Chapter 7 -- Convergence Circuitry ...................................................................................................... 7-1

Chapter 5 -- Sound Circuitry .................................................................................................................. 8-1

V20 Chassis Technical Training

and Troubleshooting Guide

Introduction

The digital ready V20 chassis is currently available in

three chassis versions, V20A V20C and V20C+. The

models using each chassis type are listed above. The

V20A has a 4:3 aspect ratio. The V20C and C+ ver-

sions have 16:9 aspect ratios. The VK20 will be intro-

duced later in this model year in a 42" wide screen for-

mat. Each chassis type has slightly different customer

features. But, for trouble shooting purposes, they are

almost identical.

The V20 chassis is similar in many respects to the V17

and V18 chassis. To simplfy the chassis, the number of

stand-up PCBs has been reduced. So, many of the same

circuits have been consolidated onto larger PCBs. This

manual will explain the major feature and circuitry dif-

ferences. For the areas that are relatively the same,

refer to the V17 or V18 Training Manual.

The Service Menu Codes have been changed for the

2002 Model Year. Table 1 lists the Menu Codes for all

recent Mitsubishi Chassis.

V 20A Cha ssi s

VS-50111

VS-60111

V 20C Cha ssi s

WS-48311

WS-55311

WS-65311

V 2 0C+ Ch a ssi s

WS-55411

WS-65411

WS-73411

VZ5 -VZ6-V15VZ7-VZ8-V16V17VZ9 -V18-V19V20

Option Menu 1-3-7-0 1-2-7-0 8-2-7-0 0-1-7-0 2-2-7-0

Adjustment Mode 2-3-5-7 1-2-5-7 8-2-5-7 0-1-5-7 2-2-5-7

Convergence Mode 2-3-5-9<4-5-6> 1-2-5-9<4-5-6> 8-2-5-9<4-5-6> 0-1-5-9<4-5-6> 2-2-5-9<4-5-6>

Table 1

CHASSIS

V20 Chassis Technical Training

and Troubleshooting Guide

1-1

V20 Chassis Technical Training

and Troubleshooting Guide

Chapter 1

Chassis Layout & Servicing

Figure 1: V20 Chassis -- PCB Locations

PCB-Terminal PCB-Signal PCB-Doubler PCB-Main PCB-Power

A/V Inputs Control uPC PIP-POP Horizontal Defl. Power Supplies

A/V Selection Tuning Picture Format Vertical Defl. High Voltage

3D-Y/C VCJ 3:2 Pull Down Audio Amp. SVM

NTSC Video Conver

ence Line Double Conver

ence Amps.

Decoders Generator 480i to 480p DBF

Table 1: PCB Functions

NOTE: The locations of PCB-MAIN and

PCB-POWER have been reversed

compared to previous chassis.

As mentioned in the Introduction, the main differ-

ence between the V20 chassis and the V17 and V18

chassis is the reduction of stand-up PCBs. This means

many circuits have been moved from individual PCBs

onto larger PCBs.

Table 1 lists the major circuit functions on board each

PCB. Not listed are the Control and Front PCBs.

They function identically as in previous chassis. PCB

Locations are shown in Figure 1.

V20 Chassis Technical Training

and Troubleshooting Guide

1-2

Figure 2: V20 Chassis-- Main Component Locations

Figure 2 maps the Main Component Locations. Also

visible are the Chassis Locking Clips on the left and

right side. The Release Levers are located towards

the rear of the set from each Locking Clip. This

change in location gives greater accessibility.

The RF Connectors have been strengthened in the

V20 by adding a support plate. When replacing the

PCB-Signal or RF-Switch assembly, be sure the plate

is installed on the connectors as shown in Figure 3.

The High Voltage Anode Lead Connector has been

enhanced in the V20. Spring tension between the

lead and the FBT has been added to help secure the

connection. This changes the removal procedure.

Refer to Figure 4 for the new procedure.

Also note, the FBT and HV Block have been com-

bined into a one piece unit.

Figure 3: V20 Chassis -- RF Switch

1-3

V20 Chassis Technical Training

and Troubleshooting Guide

1) Push DOWN on the Anode Lead.

2) While holding the lead down, rotate

the lead 90º counter clockwise.

3) Carefully remove the Anode Lead

from the Flyback Transformer.

Figure 4: V20 Chassis -- HV Anode Lead Removal Procedure

Self Diagnostics

The “Power ON LED” provides an indication of

the sets operation, and the possible cause of a

shutdown condition.

A. Initial Control Circuitry Check

Immediately after the TV is connected to

an AC power source:

• The LED flashes three times... indicating

the Microprocessor has initialized and is

functioning properly.

• If the LED does not flash... the Micropro-

cessor is NOT functioning.

B. Error Code Operational Check

Pressing the front panel “INPUT” and

“MENU” buttons at the same time, and

holding for 5 seconds, activates the Error

Code Mode. The LED flashes denoting a

two digit Error Code, or indicating no

problem has occured since the last Power

Off.

Error Code Description

12 No error has occurred.

21 X-Ray Protect circuit.

22 Short Protect circuit.

23 Horizontal Deflection failure.

24 Vertical Deflection failure.

Note: The front panel buttons must be used,

NOT those on the Remote Control.

• The number of flashes indicates the

value of the MSD (tens digit) of the

Error Code.

• The flashing then pauses for approxi-

mately 1/2 second.

• The LED then flashes indicating the

value of the LSD (ones digit) of the

Error Code.

• The Error Code is repeated a total of 3

times.

Example: If the Error Code is “24”,

the LED will flash two times, pause,

and then flash fourtimes.

C. Error Codes

The Error Code designations indicating a

malfunction, or no malfunction, are listed

below:

V20 Chassis Technical Training

and Troubleshooting Guide

1-4

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