Toshiba 37XV553D Schematic

(*1), as indicated by the underlined serial number.

©

SERVICE MANUAL

LCD Color Television

37XV553D

This model is classified as a green product

Ver. 2.00

This Service Manual describes replacement parts for the green product. When repairing this

green product, use the part(s) described in this manual and lead-free solder (*2).

For (*1) and (*2), refer to GREEN PRODUCT PROCUREMENT and LEAD-FREE

SOLDER.

TOSHIBA CORPORATION

IMPORTANT NOTICE

WARNING:

You are requested that you shall not modify or alter the information or data

provided herein without prior written consent by Toshiba. Toshiba shall not

be liable to anybody for any damages, losses, expenses or costs, if any,

incurred in connection with or as a result of such modification or alteration.

THE INFORMATION OR DATA HEREIN SHALL BE PROVIDED "AS IS"

WITHOUT ANY WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED

WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

PURPOSE.

Toshiba shall not be liable for any damages, losses, expenses or costs, if

any, incurred in connection with or as a result of use of any information or

data provided herein.

IMPORTANT NOTICE

is necessary to view drawings and to activate the functions of this system. Please

up windows are limited by

the enhanced security function and this system may not work. In that case, perform the Internet Explorer

User's Guide

Contents:

Install Autodesk DWF Viewer

Internet Explorer Settings

Operating Environment

Functions Provided on Each Drawing Page

Using with Network

Install Autodesk DWF Viewer

Autodesk DWF Viewer

download and install.

Internet Explorer Settings

When Windows XP SP2 or Windows Vista is used, ActiveX control and pop-

setting using the following procedure to restore normal operation.

1. Windows version check

[My Computer (right-click)] - [Properties]

2. Internet Explorer setting

[Tools] - [Internet Options]

for Internet Explorer 7

for Windows Vista

Operating Environment

PC : Pentium III or higher recommended

Monitor : 1024 x 768 or higher resolution recommended

Mouse : A mouse with wheel recommended

OS : Microsoft Windows 2000 SP4 / XP / Vista

Browser :

Drawing viewer : Autodesk DWF Viewer 6.0 / 7.0

* Use the software following respective license terms and conditions.

Microsoft Internet Explorer 6.0 / 7.0

Functions Provided on Each Drawing Page

When the character string of a part on the drawing is clicked, its information is popped up at the location.

You can get any parts information immediately on the screen without referring to the maintenance parts list.

You can search any part within the displayed drawing or within the whole schematic diagram/board view by

up window displayed by clicking a part 's character string allows to

signal is searched and the display changes to the destination. Connecter destinations can also be searched in

When two or more search results are provided, their drawing names are displayed, allowing you to choose a

When any of the color buttons on the toolbar is clicked, it can be selected to display desired layer in its color

The Autodesk DWF Viewer enables to print the displayed drawing region as it is on a printer. It also allows

Parts Information Reference Function



Parts Search Function

specifying a location number. The pop­search the part within the applicable schematic diagram, board view or spare parts list. 

A circle appears when the part is found, showing the part's location within the drawing.

Signal Line/Connector Destination Display Function

When a name at the end of a signal line in a divided schematic diagram is clicked, the destination of the

the same way. 

desired drawing to display. 

Layer Display Changing Function

or not to display each layer. This allows you to see the pattern layer only by setting other layers to "non­display". 

PC Board View Pattern Highlighting Function



When a pattern on a board view is clicked, it is highlighted in green. This allows easy pattern tracing.

Specified Area Printing Function

to print a large-sized drawing in multiple pieces (tile printing). 



path names written on the source files of each

Create the appropriate folder where the ZEUS Engine Program Ver.2 and the ZEUS Service Manual

Using with Network

PRECAUTION

To use ZEUS Service Manual Ver.2 with network, the file-

ZEUS Engine Program Ver.2 and ZEUS Service Manual Ver.2 are to be modified.

Perform the procedure described below.

Preparation

1. Run the program file zuesFPch.exe to install the program file for File-Path to the Local PC.

-> Download zeusFPch_setup.zip (2.3MB)

2. Run the program file ZeusSetup_v2.0.exe to install the ZEUS Engine Program in C:\Program

Files\zeus of the local PC. This can be done by running the installer program provided.

3.

Ver.2 to be stored in the server.

4. Move the ZEUS Engine Program of step 2 to the folder created at step 3 in the Server.

5. Detach the ZEUS Service Manual Ver.2 to the folder created at step 3 in the Server.

6. Unzip the ZEUS Service Manual Ver.2 within the folder in the Server.

Example of folder

path names written in both source files of ZEUS

path of both ZEUS Engine Program and ZEUS Service Manual to use with

network, pay the attention to set the "Exchange to" column that should have a proper relation between

Procedure of File-Path

The zeusFPch is the exclusive program to exchange the file-

Manual and ZEUS Engine program into those applicable to the network use.

1. Whenever changing the file-

ZEUS Engine Program and ZEUS Service Manual with referring the following.

Run the zeusFPch and set "Exchange to" by referring to the examples below.

In the "Exchange to" column shows the relation between ZEUS Service Manual and ZEUS Engine

Example 1 :

Program.

../ counts the relation between.

Thus in this case, it must be ../../zeus/ (2 counts).

Example 2 :

In this case, it must be ../../../zeus/ (3 counts).

Set ZEUS Engine Program in the created folder in the server to the "Target Folder", and then press

2. Run the zeusFPch to change the path in the ZEUS Engine Program Ver.2.

3.

"START".

(This procedure is one time only)

Set unzipped ZEUS Service Manual in the created folder in the server to the "Target Folder", and then

4. Run the ZeusFPch to change the path in the ZEUS Service Manual Ver2.

5.

press "START".

(This procedure is required whenever placing service manual.)

bottom corner on the screen whenever searching the location links. This is not malfunction.

Confirmation

Confirm that service manual on the server can be operated normally by client PC.

Note:

In case of accessing the ZEUS Manual through WEB site, the small pop-up window appears at the left

IMPORTANT NOTICE

Through WEB, ver. 6.5 has been released but with it, the linking function in this manual may

A Known Malfunction

Autodesk® DWF™ Viewer version
(Free software provided through WEB)

Use Autodesk DWF Viewer ver. 6.0.

not work properly.

If ver. 6.5 has been installed, uninstall it and reinstall ver. 6.0.

To get ver. 6.0, click the icon, or contact to the nearest Toshiba Service Centre for further

assistance.

Freezing windows opened
(Cannot close the open windows)

This may happen occasionally.

In case of encountering this, follow the procedure below.

1. Press [Ctrl], [Alt] and [Delete] keys at the same time to engage windows security

windows.

2. Then, choose TASK manager and Application tab, and select TOSHIBA SERVICE

MANUAL-Microsoft Internet Explorer.

3. Click TASK-end.



Main Window back forwarded

The real cause has not been found yet but with this condition, nothing disturbs the service

manual operation.

Continue to use by operating the windows.

Precaution when opening the diagrams

While opening the diagrams, the menu in the left frame changes its color to GRAY. This is

an indication that the viewer is processing.

With this condition, the menu indication color may stick to the GRAY color or Windows

may freeze if clicking other menu.

To avoid such things, do not operate any others while menu turns GRAY color.

If entering this, re-open the service manual or refresh the left frame.

GREEN PRODUCT PROCUREMENT

prohibit any marketing of new products containing the restricted substances.

Corporation recognizes environmental protection as a key management tasks, and is doing its

products, parts and materials that have low environmental impacts.

The EC is actively promoting the WEEE & RoHS Directives that define standards for

recycling and reuse of Waste Electrical and Electronic Equipment and for the Restriction of

the use of certain Hazardous Substances. From July 1, 2006, the RoHS Directive will

Increasing attention is given to issues related to the global environmental. Toshiba

utmost to enhance and improve the quality and scope of its environmental activities. In line

with this, Toshiba proactively promotes Green Procurement, and seeks to purchase and use

Green procurement of parts is not only confined to manufacture. The same green parts used

in manufacture must also be used as replacement parts.

LEAD-FREE SOLDER

free solder must

be used in the servicing and repair of this product.

product made with lead

free solder may result in damage to the component and or PCB being

product especially when soldering large components, through

This product is manufactured using lead-free solder as a part of a movement within the

consumer products industry at large to be environmentally responsible. Lead-

WARNING: This product is manufactured using lead free solder.

DO NOT USE LEAD BASED SOLDER TO REPAIR THIS PRODUCT!

The melting temperature of lead-free solder is higher than that of leaded solder by 86ºF to

104ºF (30ºC to 40ºC). Use of a soldering iron designed for lead-based solders to repair

-

soldered. Great care should be made to ensure high-quality soldering when servicing this

-hole pins, and on PCBs as the

level of heat required to melt lead-free solder is high.

SAFETY INSTRUCTION

Always keep tools, components of the product, etc away from the children, These items

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "SAFETY

PRECAUTION" AND "PRODUCT SAFETY NOTICE" INSTRUCTIONS BELOW.

Safety Precaution

WARNING: SERVICING 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 disconnect the power plug before any disassembling of the product. It may

result in electrical shock.

3. When replacing a chassis in the cabinet, always be certain that all the protective

devices are put back in place, such as nonmetallic control knobs, insulating covers,

shields, isolation resistor-capacitor network, etc.

4.

may cause injury to children.

5. Depending on the model, use an isolation transformer or wear suitable gloves when

servicing with the power on, and disconnect the power plug to avoid electrical shock

when replacing parts. In some cases, alternating current is also impressed in the

chassis, so electrical shock is possible if the chassis is contacted with the power on.

6. Always use the replacement parts specified for the particular model when making

NEVER remodel the product in any way. Remodeling can result in improper operation,

repairs. The parts used in products require special safety characteristics such as

inflammability, voltage resistance, etc. therefore, use only replacement parts that have
these same characteristics. Use only the specified parts when the mark is indicated
in the circuit diagram or parts list.

7. Parts mounting and routing dressing of wirings should be the same as that used

originally. For safety purposes, insulating materials such as isolation tube or tape are

sometimes used and printed circuit boards are sometimes mounted floating. Also make

sure that wirings is routed and clamped to avoid parts that generate heat and which use

high voltage. Always follow the manufactured wiring routes / dressings.

8. Always ensure that all internal wirings are in accordance before re-assembling the

external casing after a repairing completed. Do not allow internal wiring to be pinched

by cabinets, panels, etc. Any error in reassembly or wiring can result in electrical

leakage, flame, etc., and may be hazardous.

9.

malfunction, or electrical leakage and flame, which may be hazardous.

10. Touch current check. (After completing the work, measure touch current to prevent an

electric shock.)

 Plug the AC cord directly into the AC outlet. Do NOT use an isolation transformer

for this check.

 Connect a measuring network for touch currents between each exposed metallic part

on the set and a good earth ground such as a water pipe.

Annex D

(normative)

Measuring network for TOUCH CURRENTS

Resistance values in orms (Ω).

V: Voltmeter or oscilloscope

(r.m.s. or peak reading)

Input resistance : 1 MΩ
Input capacitance : 200 pF

Frequency range : 15 Hz to 1 MHz and d.c. respectively

Note: Appropriate measures should be taken to obtain the correct value in case of non

sinusoidal waveforms.

The measuring instrument is calibrated by comparing the frequency factor of with the
solid line in figure F.2 of IEC 60990 at various frequencies. A calibration curve is
constructed showing the deviation of from the ideal curve as a function of frequency.

TOUCH CURRENT = /500 (peak value).

 The potential at any point (TOUCH CURRENT) expressed as voltage and

does not exceed the following value:

The part or contact of a TERMINAL is not HAZARDOUS LIVE if:

a) The open-circuit voltage should not exceed 35 V (peak) a.c. or 60 V d.c. or, if a) is not

met.

b) The measurement of the TOUCH CURRENT shall be carried out in accordance with

IEC 60990, with the measuring network described in Annex D of this standard.

The TOUCH CURRENT expressed as voltages and , does not exceed the
following values:

- for a.c. : = 35 V (peak) and = 0.35 V (peak);

- for d.c. : = 1.0 V

Note: The limit values of = 0.35 V (peak) for a.c. and = 1.0 V for d.c. correspond to
the values 0.7 mA (peak) a.c. and 2.0 mA d.c.

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 characteristics 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 electrical shock, fire, or other hazards.

SAFETY INSTRUCTION

should enter the mouth, rinse the mouth thoroughly with water. If the fluid should contact the

When attaching the LCD module to the LCD cover, position it appropriately and fasten

Handling the LCD Module

Safety Precaution

In the event that the screen is damaged or the liquid crystal (fluid) leaks, do not breathe in or

drink this fluid.

Also, never touch this fluid. Such actions could cause toxicity or skin irritation. If this fluid

skin or clothing, wipe off with alcohol, etc., and rinse thoroughly with water. If the fluid

should enter the eyes, immediately rinse the eyes thoroughly with running water.

Precautions for Handling the LCD Module

CAUTION: The metal edges of the LCD module are sharp, handle it with

care.

The LCD module can easily be damaged during disassembly or reassembly; therefore,

always observe the following precautions when handling the module.

1.

at the position where the display can be viewed most conveniently.

2. Carefully align the holes at all four corners of the LCD module with the corresponding

holes in the LCD cover and fasten with screws. Do not strongly push on the module

because any impact can adversely affect the performance. Also use caution when

handling the polarized screen because it can easily be damaged.

3. If the panel surface becomes soiled, wipe with cotton or a soft cloth. If this does not

remove the soiling, breathe on the surface and then wipe again.

If the panel surface is extremely solied, use a CRT cleaner as a cleaner. Wipe off the

panel surface by drop the cleaner on the cloth. Do not drop the cleaner on the panel.

Pay attention not to scratch the panel surface.

4. Leaving water or other fluids on the panel screen for an extended period of time can

result in discoloration or stripes. Immediately remove any type of fluid from the screen.

5. Glass is used in the panel, so do not drop or strike with hard objects. Such actions can

damage the panel.

6. CMOS-LSI circuitry is used in the LCD module, so avoid damage due to static

electricity. When handling the module, use a wrist ground or anchor ground.

7. Do not expose the LCD module to direct sunlight or strong ultraviolet rays for an

extended period of time.

8. Do not store the LCD module below the temperature conditions described in the

specifications. Failure to do so could result in freezing of the liquid crystal due to cold

air or loss of resilience or other damage.

9. Do not disassemble the LCD module. Such actions could result in improper operation.

10. When transporting the LCD module, do not use packing containing epoxy resin

(amine) or silicon resin (alcohol or oxim). The gas generated by these materials can

cause loss of polarity.

U06A

KEY

U05A

MAIN (DIGITAL)

POWER

U03A

AC SW

U04A LED

U04B RMT

Non

UAR

T

REQ

I2C

HDM

I

HDMI3

S

I

F

ATV(V

)

REMOTE

OUT

HDMI2

HDMI1

SPDIF

12V

RECEIVER

OPTICAL
SENSOR

MAIN BOARD

RF

CVBS

R/G/B/FB

EXT1

LR

(SCART)

TVOUT V

TVOUT L/R

CVBS/S(Y/C)

LR

EXT2
(SCART)

TVOUT V

TVOUT L/R

TIF

75ohm
Driver

75ohm
Driver

Standby

uCON

CVBS/RGBFB/SY/SC/(Y/Cb/ Cr) or (RGBHV)

656

FLI32626

Sequoia

Analog

Front

End

(16port)

Digital

Input A

HDMI

VBI Data

Processor

Video

Decoder

MUX

DDRII RAM*2

DCDi
MADi

Scaling

OSD

BEP

LCD

PANEL

TCON

PANEL I/F

LVDS

I2C

EEPROM

CVBS/S(Y/C)

EXT3
(FRONT)

L/R

Headphone (L/R)

TACT
KEY

EXT3
(REAR)

EXT7
PC

AUDIO

Y/Cb/Cr

L/R

R/G/B/H/V

L/RPC/HDMI

L/R

HP AMP

MTS+

APRO

MSP

AUDIO AMP

Bt601 8Bit

HD,VD,CLK

EXT4

EDID
ROM

KEY

ROM

SW

EXT5

HDMI

EDID
ROM

ADC

YCbCr 16bit

AMP

EXT6

EDID
ROM

Audio

Mux

I2S

I2C

5V1

Audio

DSP

DAC

Regulator

P811B

Sequoia

5V2D

32V

5V2

12V

Low

IR I/F

Power
Monitor

VCC AUDIO

9V

LOWB Regulator

P811C

Micro-

processor

18V AUDIO

GPIO

ADC

SPI SERIAL

FLASH ROM

12V_ LCD

P810B

24V

POWER BOARD

SPEAKER (L/R)

Standby

5V1

18V_AUDIO

POWER

AC INPUT

PFC

CIRCUIT

HIC

CONVERTER

TRANS

24V

12V_LCD

12V_LCD

REG

SCHEMATIC DIAGRAM

Precaution

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY

RADIATION PRECAUTION" FOR DIRECT VIEW CTV ONLY, "SAFETY

PRECAUTION" AND "PRODUCT SAFETY NOTICE" OF THIS MANUAL.

CAUTION: The international hazard symbols " " in the schematic diagram
and the parts list designate components which have special characteristics

important for safety and should be replaced only with types identical to

those in the original circuit or specified in the parts list.

The mounting position of replacements is to be identical with originals.

Before replacing any of these components, read carefully the SAFETY

PRECAUTION and PRODUCT SAFETY NOTICE.

Do not degrade the safety of the receiver through improper servicing.

Note:

1. RESISTOR

Resistance is shown in ohm [K=1,000, M=1,000,000]. All resistors are 1/6 W and 5 %

tolerance carbon resistor, unless otherwise noted as the following marks.

1/2R : Metal or Metal oxide of 1/2 watt

1/2S : Carbon composition of 1/2 watt

1RF : Fuse resistor of 1 watt

10 W : Cement of 10 watt

K : ±10 %

G : ±2 %

F : ±1 %

2. CAPACITOR

Unless otherwise noted in schematic, all capacitor values less than 1 are expressed in

Electrolytic capacitor

µF, and the values more than 1 in pF.

All capacitors are ceramic 50 V, unless otherwise noted as the following marks.

=

= Mylar capacitor

3. The parts indicated with " " have special characteristics, and should be replaced with
identical parts only.

4. Voltages read with DIGITAL MULTI-METER from point indicated to chassis ground,

using a color bar signal with all controls at normal, line voltage at nominal AC volts.

5. Waveforms are taken receiving color bar signal with enough sensitivity.

6. Voltage reading shown are nominal values and may vary ±20 % except H.V.