Toshiba 19AV501P User manual

SERVICE MANUAL
LCD Color Television
19AV501P
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
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FUNCTION AND OPERATION
The Remote Control
Simple at-a-glance reference of your remote control.
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FUNCTION AND OPERATION
Using the Controls
Whilst all the necessary adjustments and controls for the television are made using the
remote control, the buttons on the television may be used for some functions.
Switching On
Using the Remote Control
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Using the Controls
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FUNCTION AND OPERATION
Tuning the Television
Before switching on the television put your decoder and media recorder to Standby if they
are connected.
Quick Setup
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Manual Tune
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Using Auto Tuning
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SAFETY INSTRUCTION
Handling the LCD Module
Safety P ecaution
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, wi e off with alcohol, etc., and rinse thoroughly with water. If the fluid
should enter the eyes, immediately rinse the eyes thoroughly with running water.
P ecautions fo Handling the LCD Module
The LCD module can easily be damaged during disassembly or reassembly; therefore,
always observe the following recautions when handling the module.
1.
When attaching the LCD module to the LCD cover, osition it a ro riately and fasten
at the osition where the dis lay can be viewed most conveniently.
2. Carefully align the holes at all four corners of the LCD module with the corres onding
holes in the LCD cover and fasten with screws. Do not strongly ush on the module
because any im act can adversely affect the erformance. Also use caution when
handling the olarized screen because it can easily be damaged.
CAUTION: The metal edges of the LCD module a e sha p, handle it with
ca e.
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3. If the anel surface becomes soiled, wi e with cotton or a soft cloth. If this does not
remove the soiling, breathe on the surface and then wi e again.
If the anel surface is extremely solied, use a CRT cleaner as a cleaner. Wi e off the
anel surface by dro the cleaner on the cloth. Do not dro the cleaner on the anel.
Pay attention not to scratch the anel surface.
4. Leaving water or other fluids on the anel screen for an extended eriod of time can
result in discoloration or stri es. Immediately remove any ty e of fluid from the screen.
5. Glass is used in the anel, so do not dro or strike with hard objects. Such actions can
damage the anel.
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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 ex ose the LCD module to direct sunlight or strong ultraviolet rays for an
extended eriod of time.
8. Do not store the LCD module below the tem erature conditions described in the
s ecifications. 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 im ro er o eration.
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10. When trans orting the LCD module, do not use acking containing e oxy resin
(amine) or silicon resin (alcohol or oxim). The gas generated by these materials can
cause loss of olarity.
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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.
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
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.
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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
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
The potential at any point (TOUCH CURRENT) expressed as voltage and
does not exceed the following value:
Resistan e values in orms (Ω).
Input resistan e : 1 MΩ
Input apa itan e : 200 pF
Frequen y range : 15 Hz to 1 MHz and d. . respe tively
Note: Appropriate measures should be taken to obtain the orre t value in ase of non
sinusoidal waveforms.
The measuring instrument is alibrated by omparing the frequen y fa tor of with the
solid line in figure F.2 of IEC 60990 at various frequen ies. A alibration urve is
onstru ted showing the deviation of from the ideal urve as a fun tion of frequen y.
TOUCH CURRENT = /500 (peak value).
V:
Voltmeter or os illos ope
(r.m.s. or peak reading)
The part or onta t of a TERMINAL is not HAZARDOUS LIVE if:
Note: The limit values of = 0.35 V (peak) for a. . and = 1.0 V for d. . orrespond to
the values 0.7 mA (peak) a. . and 2.0 mA d. .
a) The open- ir uit voltage should not ex eed 35 V (peak) a. . or 60 V d. . or, if a) is not
met.
b) The measurement of the TOUCH CURRENT shall be arried out in a ordan e with
IEC 60990, with the measuring network des ribed in Annex D of this standard.
The TOUCH CURRENT expressed as voltages and , does not ex eed the
following values:
- for a. . : = 35 V (peak) and = 0.35 V (peak);
- for d. . : = 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.
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