TOSHIBA 50V9UE - Service Manual Immediate Download

TOSHIBA CORPORATION

1-1, SHIBAURA 1- CHOME, MINATO-KU, TOKYO 105-8001, JAPAN

SERVICE MANUAL

COLOUR TELEVISION

Dec., 2002

FILE NO. 040-200211

V9PJ Chassis

50V9UE, 50VH9UA

50V9UM

GENERAL

ADJUSTMENTS

TABLE OF CONTENTS

CHAPTER 1 GENERAL ADJUSTMENTS

SAFETY INSTRUCTIONS ............................................................................................................................................... 3

CRT ASSEMBLY REPLACEMENT AND MOUNTING .................................................................................................... 4

PICTURE TUBE COMPONENTS ADJUSTMENT ........................................................................................................... 6

SERVICE POSITION ....................................................................................................................................................... 9

SERVICE MODE ........................................................................................................................................................... 10

DESIGN MODE ............................................................................................................................................................. 13

ELECTRICAL ADJUSTMENT ....................................................................................................................................... 14

CONVERGENCE ADJUSTMENT .................................................................................................................................. 20

SCREEN AND MIRROR ALIGNMENTS ....................................................................................................................... 37

CIRCUIT CHECKS ........................................................................................................................................................ 38

CHAPTER 2 SPECIFIC INFORMATIONS

SETTING & ADJUSTING DATA ..................................................................................................................................... 39

LOCATION OF CONTROLS .......................................................................................................................................... 40

PROGRAMMING CHANNEL MEMORY ........................................................................................................................ 42

MECHANICAL DISASSEMBLY ..................................................................................................................................... 44

CHASSIS AND CABINET REPLACEMENT PARTS LIST ............................................................................................. 45

PC BOARDS BOTTOM VIEW ........................................................................................................................................ 63

TERMINAL VIEW OF TRANSISTORS .......................................................................................................................... 75

CIRCUIT BLOCK DIAGRAM ......................................................................................................................................... 77

SPECIFICATIONS ..................................................................................................................................................... END

APPENDIX:

CIRCUIT DIAGRAM

GENERAL

ADJUSTMENTS

CHAPTER 1 GENERAL ADJUSTMENTS

SAFETY INSTRUCTIONS

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY RADIATION PRECAUTION", "SAFETY PRECAU-

TION" AND "PRODUCT SAFETY NOTICE" INSTRUCTIONS BELOW.

X-RAY RADIATION PRECAUTION

1. Excessive high voltage can produce potentially hazard-

ous X-RAY RADIATION. To avoid such hazards, the high

voltage must not be above the specified limit. The nominal

value of the high voltage of this receiver is (A) kV at zero

beam current (minimum brightness) under a (C) V AC power

source. The high voltage must not, under any circum-

stances, exceed (B) kV.

Refer to table-1 for high voltage (A), (B) & AC voltage (C).

(See SETTING & ADJUSTING DATA on page 39)

Each time a receiver requires servicing, the high voltage

should be checked following the HIGH VOLTAGE CHECK

procedure in this manual. It is recommended that the read-

ing of the high voltage be recorded as a part of the service

record. It is important to use an accurate and reliable high

voltage meter.

2. The only source of X-RAY RADIATION in this TV receiver

is the picture tube. For continued X-RAY RADIATION pro-

tection, the replacement tube must be exactly the same

type tube as specified in the parts list.

3. Some part in this receiver have special safety-related char-

acteristics for X-RAY RADIATION protection. For contin-

ued safety, parts replacement should be undertaken only

after referring to the PRODUCT SAFETY NOTICE below.

SAFETY PRECAUTION

WARNING : Service should not be attempted by anyone unfamiliar with the necessary precautions on this receiver. The following

are the necessary precautions to be observed before servicing this chassis.

1. An isolation transformer should be connected in the power line between the receiver and the AC line before any service is

performed on the receiver.

2. Always discharge the picture tube anode to the CRT conductive coating before handling the picture tube. The picture tube

is highly evacuated and if broken, glass fragments will be violently expelled. Use shatter proof goggles and keep picture tube

away from the unprotected body while handling.

3. When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in place, such as; non-

metallic control knobs, insulating covers, shields, isolation resistor-capacitor network etc.

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These characteristics are

often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using

replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety char-

acteristics are identified in this manual and its supplements; electrical components having such features are identified by

the international hazard symbols on the schematic diagram and the parts list.

Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement

parts which do not have the same safety characteristics as specified in the parts list may create shock, fire, X-ray

radiation or other hazards.

GENERAL

ADJUSTMENTS

CRT ASSEMBLY REPLACEMENT AND MOUNTING

CAUTION :

DO NOT LOOSEN THE HEX HEAD BOLTS WITH SPRINGS (12 PCS), BECAUSE THOSE ARE FOR

SEALING OF CRT COOLANT.

Lens and Neck Components View

4 Screws

CRT Anode Cap Assembly

S.V.M. Coil

CRT DRIVE Board

Lens Assembly

CRT Assembly

Deflection Yoke and Conver Yoke

CRT Mounting

4 Screws

Attention Serviceman

The Hex Head

Bolts with

Springs. (see

sketch) used on

CRT assembly,

are "NOT"

Adjustment Screws

DO NOT LOOSEN-FLUID

LEAKAGE WILL OCCUR.

8 o'clock

4 o'clock

GENERAL

ADJUSTMENTS

TO REMOVE CRT (Same procedure for R, G, B)

1. Remove CRT DRIVE Board, S. V. M. COIL and

DEF. YOKE from CRT.

2. Remove Lens Assembly.

3. Detach CRT Anode Cap from CRT.

4. Remove CRT Assembly from CRT Mounting.

CRT REPLACEMENT (Same procedure for R, G, B)

Reverse the removal procedures except the followings.

1. Anode Cable should be replaced with new one.

See "SERVICING PRECAUTIONS" shown below.

2. Install silicon (T461B) to the CRT, replace the Anode

cable and put enough silicon again on around the An-

ode Cap as illustrated.

CAUTION: Align the Anode cable as illustrated on page

ADJUSTING PROCEDURE IN REPLACING CRT

1. R.G.B. CUTOFF (SCREEN VR) ADJUSTMENT (page 6.)

2. R.G.B. FOCUS ADJUSTMENT (page 6.)

3. PICTURE TILT ADJUSTMENT (page 7.)

4. USER CONVERGENCE CENTER CHECK

(Refer to owner's manual.)

5. CENTERING ADJUSTMENT (page 7.)

6. CONVERGENCE ADJUSTMENT (page 20.)

7. WHITE BALANCE ADJUSTMENT (page 14.)

Adjustments are complete.

SERVICING PRECAUTIONS

I Check the point of anode lead in a straight

line, if it is winding, please revise it.

Anode lead holder

I Do not use a magnetized screw driver for screws

of Deflection Yoke and Velocity Modulation Coil to

avoid magnetization of electron gun.

Magnetization of electron gun will degrade basic

function and result in unbalance of right and left

shift of user static convergence, and result in no

variable quantity.

I When replacing the anode cap assembly (CRT) or

anode lead assembly (F.B.T.), remove the anode

lead holder from old one and attach the holder

again to new anode lead.

Screw

for D.Y

Screw for SVM coil

Silicon

(On shaded area)

TSE3843W #23960136

2 ~ 5 mm

15 ~ 25 mm

Anode Cap