Toshiba 32AV933N User manual

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SERVICE MANUAL
LCD Color Television
32AV933N Ver. 1.00
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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.
IMPORTANT NOTICE
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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 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.
GREEN PRODUCT PROCUREMENT
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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-free solder must 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-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.
LEAD-FREE SOLDER
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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. 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.
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.
SAFETY INSTRUCTION

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:
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.
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

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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.
SAFETY INSTRUCTION
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