Toshiba 37HLC56 Schematic

SERVICE MANUAL

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

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LCD Color Television

37HLC56

Ver. 1.01

This model is classified as a green product

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

SOLDER

© TOSHIBA CORPORATION

.

GREEN PRODUCT PROCUREMENT

and

LEAD-FREE

GREEN PRODUCT PROCUREMENT

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

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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

prohibit any marketing of new products containing the restricted substances.

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

products, parts and materials that have low environmental impacts.

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

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

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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-

be used in the servicing and repair of this product.

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

product made with lead-

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

product especially when soldering large components, through-hole pins, and on PCBs as the

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

IMPORTANT NOTICE

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

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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.

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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.

IMPORTANT NOTICE

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User Guide

Autodesk® DWF™ Viewer

this system. Please download and install.

When

function and this sample may not work. In that case, perform the Internet Explorer setting

using the following procedure to restore normal operation.

Windows XP SP2

1. Windows version check

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

is necessary to view drawings and to activate the functions of

is used, pop-up windows are limited by the enhanced security

2. Internet Explorer setting

[Tools] - [Internet Options]

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Operating Environment

PC : Pentium III or higher recommended

Monitor : 1024 x 768 or higher resolution recommended

Mouse : A mouse with wheel recommended

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OS : Microsoft Windows 2000/XP

Browser :

Drawing viewer : Autodesk DWF Viewer 6.0

* Use the software following respective license terms and conditions.

Microsoft Internet Explorer 6.0 or later

Note:

In case of using this service manual with network connection, allocate its folder to the client

PCs as

network drive

to avoid any possible malfunction.

Or in case of accessing it through WEB site, the small pop-up window appears at the left

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

Functions Provided on Each Drawing Page

Parts Information Reference Function

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. 

Parts Search Function

You can search any part within the displayed drawing or within the whole schematic

diagram/board view by specifying a location number. The pop-up window displayed by

clicking a part's character string allows to search 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 signal is searched and the display changes to the destination. Connecter

destinations can also be searched in the same way.



When two or more search results are provided, their drawing names are displayed, allowing

you to choose a desired drawing to display. 

Layer Display Changing Function

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

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

layer in its color or not to display each layer. This allows you to see the pattern layer only by

setting other layers to "non-display". 

PC Board View Pattern Highlighting Function

tracing. 

Specified Area Printing Function

The Autodesk DWF Viewer enables to print the displayed drawing region as it is on a

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

IMPORTANT NOTICE

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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.

ADJUSTMENT

While holding the MUTE button, press MENU

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Service Mode

Entering to Service Mode

1. Set VOLUME to minimum and press MUTE

button once on remote control.

↓↓↓↓

↓↓↓↓

Service Mode display

2. Press MUTE button again and hold button

down.

3.

button on TV set.

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Displaying the Adjustment Menu

Press MENU button on TV.

Service Mode

Press

Adjustment Mode

↑↑↑↑ ↓↓↓↓

Press

Key Function in the Service Mode

The following key entry during display of adjustment menu provides special functions.

CAUTION: Never try to perform initialization unless you have changed the

memory IC.

button (on remote control)

Test signal selection

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Selection of the adjustment items CH (on TV or remote control)

Change of the data value Volume +/- (on TV or remote control)

Adjustment menu mode ON/OFF MENU button (on TV)

Initialization of the memory (QA02) CALL + CH button on TV ( )

"RCUT" selection 1 button

"GCUT" selection 2 button

"BCUT" selection 3 button

"CNTX" selection 4 button

"COLC" selection 5 button

"UVTT" selection 6 button

Automatic A/D Adjustment

(PC, Component, Composite (NTSC))

Self diagnostic display ON/OFF 9 button

7 button

Selecting the Adjusting Item

Every pressing of CH button in the service mode changes the adjustment items in the
order of table below. ( button for reverse order)

SETTING & ADJUSTING DATA

[ SERVICE MODE ]

ADJUSTING ITEMS AND DATA IN THE SERVICE MODE:

Note:

The image system data of RCUT-BDRV is different by each image format.

Canada

Item Name of adjustment

Preset Data

RCUT R CUT OFF 00H

GCUT G CUT OFF 00H

←

←

BCUT B CUT OFF 00H

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←

RDRV R DRIVE 79H

GDRV G DRIVE 7CH

BDRV B DRIVE 87H

BRTC BRIGHTNESS CENTER FDH

COLC COLOR CENTER C8H

UVTT BASE BAND TINT FEH

CNTX CONTRAST MAX 86H

VOLUX MAX VOLUME LIMITED 7FH

PLLW0 PLL WAIT TIME 14H

PLLW1 PLL WAIT TIME 03H

PLLW2 PLL WAIT TIME 0FH

PLLW3 PLL WAIT TIME 05H

PLLW4 PLL WAIT TIME 14H

PLLW5 PLL WAIT TIME 04H

←

←

←

←

←

←

←

←

←

←

←

←

←

←

Adjusting the Data

Pressing of VOLUME +/- button will change the value of data in the range from 00H to
FFH. The variable range depends on the adjusting item.

Exit from Service Mode

Pressing POWER button to turn off the TV once.

Initialization of Memory Data of QA02

After replacing QA02, the following initialization is required.

CAUTION: Never attempt to initialize the data unless QA02 has been

replaced.

1. Enter the service mode, then select any register item.

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2. Press and hold the CALL button on the remote control, then press the CH button on
the TV.

The initialization of QA02 has been completed.

3. Check the picture carefully. If necessary, adjust any adjustment item above.

Perform "Auto tune" on the owner's manual.

Test Signal Selection

Every pressing of INPUT button on the remote control changes the built-in test patterns on

screen as described below in Service Mode.

Picture Signal

Red raster

Green raster

Blue raster

All Black

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All White

Self Diagnostic Function

1. Press "9" button on remote control during display of adjustment menu in the service

mode. The diagnosis will begin to check if interface among IC's is executed properly.

2. During diagnosis, the following displays are shown.

(1) Firmware :

Version information of microprocessor

In case of file name : HCL56 and Version : 0459 indicates [HLC56_0459].

(2) Time : Total hour of turn the TV on. (Unit : H)

(3) Bus line : -- "OK" is normal

SCL-GND (Red indication) : SCL-GND short circuit

SDA-GND (Red indication) : SDA-GND short circuit

SCL-SDA (Red indication) : SCL-SDA short circuit

(4) Bus cont : --- "OK" is normal.

When the abnormal status is detected, the type name of semiconductor is

indicated in red color.

(5) Block

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V1 - V4 : VIDEO 1-4 input mode

PC : PC mode

V1

(Composite/Component)

V2

(Composite/S-VIDEO)

V3

V4 HDMI

PC PC

HLC56

Video1/

ColorStreamHD1

Video2

ColorStreamHD2

(Component)

Version Check Mode

1. Press "9" button twice on remote control during display of adjustment menu in the

service mode.

The version of the main MPU will be checked.

2. During Version Check, the following displays are shown.

NTSC (60 Hz) SD signal (composite input)

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(1) MAIN MPU :

Version information of microprocessor

In case of file name : HLC56, Version 4569 for Code Program Version and (U01) for

OSD Version indicates [HLC56_0459(U01)]

(2) EEPROM :

Version information of EEPROM : Display 1 byte data.

(3) SUB MPU :

Version information of SUB MPU : Display 1 byte data.

(4) OPTION :

Option information : Display six numbers of 1 byte data.

(5) HDMI ID :

HDMI ID information : Display 4 byte data.

(6) A/D Adjust

A/D adjustment item.

--COMP : Component input

--PC : PC input

--NTSC :

--OK : A/D adjustment set correctly.

--NG : A/D adjustment set incorrect.

(7) LCD Panel Vender information display

The following Panel Vender and screen size are displayed.

Panel Vender Screen Size (Inch)

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LPL -26

SHP -32

CMO -37

Example : AUO-32 indicates that Vender is AUO and Screen Size is 32 inch.

Status Check Mode

1. Press "9" button thrice on remote control during display of adjustment menu in the

service mode.

The status of the model will be checked.

2. During Status Check, the following displays are shown.

(1) MAIN :

Main source information : Input Source (EXT1/2/3/HDMI etc.)

(2) MAIN FORMAT :

Display Video and PC format information

(3) SCREEN SIZE :

Display the screen size as follows.

TheaterWide 1

TheaterWide 2

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TheaterWide 3

FULL

NATURAL

4:3 HD

(4) OTHER STATUS :

Other status information : Display three numbers of 2 byte data.

LED Indication

Red LEDs on the TV (at the bottom center of the TV) indicate the TV's status, as described

below.



Red OFF = The TV is in a standby mode.



Red ON = The TV is in a normal operation mode.

1 Red blinks continuously at 0.5-

second intervals.

2 Red blinks continuously at 1-

second intervals.

LED Indication Condition Solution

Abnormal operation Turn OFF the TV and unplug

Abnormal operation of

BUS line.

the power cord.

Plug the power cord in again

and turn ON the TV.

Turn OFF the TV and unplug

the power cord.

Plug the power cord in again

and turn ON the TV.

FUNCTION AND OPERATION

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Front and Side Panel Control and Connection

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FUNCTION AND OPERATION

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Learning about the Remote Control

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FUNCTION AND OPERATION

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Using the Remote Control to Operate Your Other Device

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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

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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.

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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

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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.

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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.

SAFETY INSTRUCTION

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

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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

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

inflammability, voltage resistance, etc. therefore, use only replacement parts that have

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

cabinet such as antennas, terminals, screw heads, metal overlays, control shafts and etc.

The leakage current checking. (After completing the work, measure the leakage current

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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. Always perform an AC leakage current checking on the exposed metallic parts of the

to be sure that the set is safe to operate without any dangerous of electrical shocks

before returning the set to the customer.

11.

to prevent an electrical shock.)



Plug the AC line cord directly into a 120V AC outlet. Do not use an isolation

transformer for this check.



Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the following

manner.

Connect a 1500 ohm 10 watt resistor, paralleled by a 0.15 µF, AC type capacitor,

between a known good earth ground (water pipe, conduit, etc.) and the exposed

metallic parts, one at a time. Measure the AC voltage across the combination of 1500

ohm resistor and 0.15 µF capacitor. Reverse the AC plug at the AC outlet and repeat

AC voltage measurements for each exposed metallic part. Voltage measured must not

exceed 0.3 volts rms. This corresponds to 0.2 milliamp. AC. Any value exceeding this

limit constitutes a potential shock hazard and must be corrected immediately.

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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.

SPECIFICATION

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Non

656

YCbCr16bi

t

Bt6018Bit

HD,VD,CLK

UAR

T

REQ

I2C

I2C

I2C

AV BOARD

Input
Terminal
(Audio)

CVBS(L/R)
S-VIDEO(L/R)
YCbCr(L/R)

PC_IN(L/R)

HP_AMP

MTS+
APRO

MSP

Standby

uCON

SW

SIGNAL BOARD

PANEL

DDR RAM

FLI8538

CORTEZ Plus

Analog

Front

End

(16port)

Digital

Input A

Digital

Input B

DACAMP

VBI Data

Processor

Video

Decoder

MUX

DCDi
MADi

Scaling

2nd
Channel
Process

IR I/F

OSD

BEP

Micro-

processor

PANEL I/F

LVDS

EEPROM

GPI

AD

FLASH ROM

Sound AMP

Input

PLL

Cortez

Regulator

Terminal
(Video)

CVBS

HDMI

VOC

S-VIDEO
YCbCr
PC IN

SPEAKER

Headphone

+Low B

POWER BOARD

HDMI

AC INPUT&

Power

SCHEMATIC DIAGRAM

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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

µF, and the values more than 1 in pF.

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

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file://C:\Documents and Settings\Alexsandr\Local Settings\Temp\Rar$EXa0.766\37H

...

= Electrolytic capacitor

= 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.