Toshiba 40WL768 User manual

SERVICE MANUAL
LCD Color Television
40WL768
Ver. 2.00
This model is classified as a green product
(*1), as indicated by the underlined serial number.
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
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
is necessary to view drawings and to activate the functions of this system. Please
download and install.
Internet Explorer Settings
When Windows XP SP2 or Windows Vista is used, ActiveX control and pop-
up windows are limited by
the enhanced security function and this system may not work. In that case, perform the Internet Explorer
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 : Microsoft Internet Explorer 6.0 / 7.0
Drawing viewer : Autodesk DWF Viewer 6.0 / 7.0
* Use the software following respective license terms and conditions.

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

Using with Network
PRECAUTION
To use ZEUS Service Manual Ver.2 with network, the file-
path names written on the source files of each
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.
Create the appropriate folder where the ZEUS Engine Program Ver.2 and the ZEUS Service Manual
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

Procedure of File-Path
The zeusFPch is the exclusive program to exchange the file-
path names written in both source files of ZEUS
Manual and ZEUS Engine program into those applicable to the network use.
1. Whenever changing the file-
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
ZEUS Engine Program and ZEUS Service Manual with referring the following.

Run the zeusFPch and set "Exchange to" by referring to the examples below.
Example 1 :
In the "Exchange to" column shows the relation between ZEUS Service Manual and ZEUS Engine
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).

2. Run the zeusFPch to change the path in the ZEUS Engine Program Ver.2.
3.
Set ZEUS Engine Program in the created folder in the server to the "Target Folder", and then press
"START".
(This procedure is one time only)

4. Run the ZeusFPch to change the path in the ZEUS Service Manual Ver2.
5.
Set unzipped ZEUS Service Manual in the created folder in the server to the "Target Folder", and then
press "START".
(This procedure is required whenever placing service manual.)

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

IMPORTANT NOTICE
A Known Malfunction
Autodesk® DWF™ Viewer version
(Free software provided through WEB)
Use Autodesk DWF Viewer ver. 6.0.
Through WEB, ver. 6.5 has been released but with it, the linking function in this manual may
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
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
Corporation recognizes environmental protection as a key management tasks, and is doing its
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
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-
free solder must
be used in the servicing and repair of 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-
free solder may result in damage to the component and or PCB being
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.
WARNING: This product is manufactured using lead free solder.
DO NOT USE LEAD BASED SOLDER TO REPAIR THIS PRODUCT!

SAFETY INSTRUCTION
Safety Precaution
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.
Always keep tools, components of the product, etc away from the children, These items
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.
WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "SAFETY
PRECAUTION" AND "PRODUCT SAFETY NOTICE" INSTRUCTIONS BELOW.
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.

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

 The potential at any point (TOUCH CURRENT) expressed as voltage and
does not exceed the following value:
Resistance values in orms (Ω).
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).
V:
Voltmeter or oscilloscope
(r.m.s. or peak reading)
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);