Toshiba 32AV933N Schematic

SERVICE MANUAL

LCD Color Television

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32AV933N

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Ver. 1.00

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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.

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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.

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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.

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.

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SAFETY INSTRUCTION

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.

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

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.

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SAFETY INSTRUCTION

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.

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SAFETY INSTRUCTION

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 should enter the mouth, rinse the mouth thoroughly with

water. If the fluid should contact the 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. When attaching the LCD module to the LCD cover, position it appropriately and fasten 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.

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.

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P201 P202 CN1 CN12 1 24V 1 12V 1 +12V_NORMAL 1 PANEL_VCC 2 24V 2 12V 2 +12V_NORMAL 2 PANEL_VCC 3 24V 3 12V 3 +12V_NORMAL 3 PANEL_VCC 4 24V 4 GND 4 GND 4 PANEL_VCC 5 24V 5 GND 5 GND 5 OD_OCP_SEL 6 GND 6 GND 6 GND 6 PANEL_VCC 7 GND 7 5VSB 7 +5V_Standby 7 RXE4+ 8 GND 8 5VSB 8 +5V_Standby 8 GND 9 GND 9 5VSB 9 +5V_Standby 9 RXE3+

10 GND 10 ACD 10 ACDetect 10 RXE411 BRIGHT_ADJ 11 BD_PS_ON 11 GND 11 RXEC+ 12 INV_ON_OFF 12 BRIGHT_ADJ 12 OCP_OUTPUT_PWM 12 RXE3-

13 INV_ON_OFF 13 INVERTER_ON_OFF 13 GND 14 PS_ON 14 STANDBY 14 RXEC-

15 RXE2+ 16 GND 17 RXE1+ 18 REX219 REX0+ 20 REX121 GND 22 REX023 RXO4+ 24 GND 25 RXO3+ 26 RXO427 RXOC+ 28 RXO329 GND 30 RXOC31 RXO2+ 32 GND 33 RXO1+ 34 RXO235 RXO0+ 36 RXO137 GND 38 RXO039 BRIGHT_ADJ 40 OCP_OUTPUT_PWM

CN2 1 GND 2 LED_TIMER 3 LED_ON_OFF 4 LED_ON_OFF CN11 5 IRIN 1 SPK_R6 +5V_Standby 2 SPK_R+

3 SPK_L4 SPK_L+

CN202 1 +5V_STBY 2 IRIN 3 GND 4 LED_ON_OFF 5 LED_ON_OFF 6 LED_TIMER

IR_LED BORAD

Speaker

MAIN BOARD

PSU Unit

PANEL (T-CON)

PANEL INVERTER

Speaker

TROUBLESHOOTING GUIDE

UNDER CONSTRUCTION

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