SONY 20VL43U, KV 1483RWP, 14VL43U Service Manual
FILE NO. 010-200303
DOCUMENT CREATED IN JAPAN, Mar., 2003
SERVICE MANUAL
LCD TELEVISION
20VL43U, 14VL43U
SERVICE SAFETY PRECAUTIONS.................................................................................................................................... 3
HANDLING THE LCD MODULE .......................................................................................................................................... 5
LOCATION OF CONTROLS ................................................................................................................................................ 7
LAYOUT OF MAJOR BOARDS ............................................................................................................................................9
MECHANICAL DISASSEMBLY .......................................................................................................................................... 10
PACKING DISASSEMBLY.................................................................................................................................................. 13
WIRING CONNECTION DIAGRAM ...................................................................................................................................15
GENERAL ADJUSTMENTS
CHASSIS AND CABINET REPLACEMENT PARTS LIST ................................................................................................. 16
PC BOARDS BOTTOM VIEW ............................................................................................................................................ 23
SPECIFICATIONS .......................................................................................................................................................... END
APPENDIX:
CIRCUIT DIAGRAM
TABLE OF CONTENTS
SPECIFIC INFORMATIONS
– 2 –
SERVICE SAFETY PRECAUTIONS
• The caution items shown here describe major safety issues and should always be observed.
• The meanings of the various indications are as follows.
WARNING
CAUTION
* Physical damage means major damage to a home, furnishings and other possessions.
Examples of marks
SHOCK HAZARD
PROHIBIT DISASSEM-
BLING
UNPULUG
Indicates a hypothetical situation in which service personnel and nearby third parties, or even
end users due to a product defect after the service operation is completed, could possibly be in
danger of injury or even death in the event of operational error.
Indicates a hypothetical situation in which service personnel and nearby third parties, or even
end users after the service operation is completed, could possibly be in danger of injury, or
where there could be physical damage in the event of operational error.
The > indicates caution (including danger and warning).
The actual meaning of this caution is indicated inside the > or nearby illustrations or text.
The example shown to the left indicates the danger of "electrical shock".
indicates a forbidden action.
The
The actual meaning of this caution is indicated inside the or nearby illustrations or text.
The example shown to the left indicates that disassembly is forbidden.
The a indicates a forced action (an action that must be performed).
The actual meaning of this forced action is indicated by a or nearby illustrations or text.
The example shown to the left indicates that the power plug must be disconnected.
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
– 3 –
KEEP CHILDREN
AWAY
UNPULUG
GENERAL ADJUSTMENTS
SHOCK HAZARD
USE SPECIFIED
PARTS
SPECIFIC INFORMATIONS
CAUTION FOR
WIRING
CAUTION FOR
ASSEMBLING /
WIRING
WARNING
• Always advise users to keep children away.
There is danger of injury to children from tools, disassembled products, etc.
• Always disconnect the power plug before starting work whenever power is not required.
Failure to disconnect the power plug before starting work can result in electrical shock.
• Depending on the model, use an insulation transformer or wear 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.
• Always use the replacement parts specified for the particular model when making repairs.
The parts used in products have the necessary 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 included in a circuit diagram or parts list.
• Parts mounting and routing of the wiring should be the same as that used originally.
For safety purposes, insulating materials such as tubing or tape is sometimes used and printed
circuit boards are sometimes mounted floating.
Also make sure that wiring is routed and clamped to avoid parts that generate heat and which
use high voltage. Always follow the original scheme.
• After a repair has been completed, reassemble all disassembled parts, and route and reconnect the wiring, in accordance with the original scheme.
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.
CHECK INSULATION
RESISTANCE
PROHIBIT
REMODELING
• After completing the work, disconnect the power plug from the outlet, remove the antenna, turn
on the power switch. Then, use a 500V insulation resistance meter to check the insulation
resistance of the antenna terminal, other metallic parts and between the prongs of the power
plug to make sure that the insulation resistance is 1M Ω or more.
The set will require inspection and repair if the insulation resistance is below this value.
• Never remodel the product in any way.
Remodeling can result in improper operation, malfunction, or electrical leakage and flame,
which may be hazardous
– 4 –
HANDLING THE LCD MODULE
Safety Precautions
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
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.
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.
GENERAL ADJUSTMENTS
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.
SPECIFIC INFORMATIONS
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.
The metal edges of the LCD module
CAUTION
are sharp, so use caution to avoid injury.
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 electricity. When handling the module, use a wrist ground or anchor ground.
– 5 –
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
GENERAL ADJUSTMENTS
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.
SPECIFIC INFORMATIONS
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.
– 6 –
LOCATION OF CONTROLS (Representative: 20VL43U)
TV front
VOLUME ; :
CHANNEL 9 8
TV/VIDEO POWER
AUDIO
OUT
VIDEO-2
Remote Sensor
GENERAL ADJUSTMENTS
HEADPHONES
Jack
SPECIFIC INFORMATIONS
TV rear
To remove the cover, pull the button of the cover
toward you.
VIDEO-1
DC input
– 7 –
Remote Control
RECALL displays screen information.
CHANNEL NUMBERS (0-9) allow direct access to channel.
+100 selects channels over 100.
POWER turns the TV on and off.
MUTE mutes the sound.
VIDEO1 selects video 1 mode.
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
VIDEO2 selects video 2 mode.
MENU allows access to programming menus.
ENTER sets programming menu information.
SLEEP sets the TV to go off at a set time.
CH 8 9 cycles through programmed channels. Also used to highlight se-
lections on the on-screen menus.
VOL ; : adjusts the volume level. Also used to increase or reduce the
value of a menu option.
FAV 8 9 cycles through favorite channels.
MTS switches MTS (stereo or SAP) sound.
WOW switches sound effect on and off.
– 8 –
LAYOUT OF MAJOR BOARDS
Inverter Board Key/Control Board
Main Board
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
Inverter Board Light-Receiving Board
– 9 –
Ferrite Core
GENERAL ADJUSTMENTS
Flexible Cable
A206
Copper Foil
Main Unit Base
SPECIFIC INFORMATIONS
Connector
Screw
A205
Main Board
Grounding Wire
A
Jack Plate
Copper Foil
MECHANICAL DISASSEMBLY (Representative:20VL43U)
A204
– 10 –
Screw with washer
Plate
A203
Grounding Wire
Screw
GENERAL ADJUSTMENTS
V001
Speaker Ass'y
SPECIFIC INFORMATIONS
A206
Claw
A205
Insulating Plate (Baked
plate:attached on upper
and lower shields)
Claw
Shield Case
Main Board
– 11 –
Screw
Chilled
Metal
Fittings
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
Grounding Wire
LCD Back Panel
Screw
Chilled Metal Fittings
LCD Back Panel
LCD Ass'y
LCD Back Panel
Flexible Cable
Screw
Screw
Grounding Wire
Claw (19 pcs)
LCD Front Panel
– 12 –
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