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SERVICE MANUAL
LED TV
Model No. LET-26C600
LEY-26C600
MSD306 Chassis
WARNING
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to
service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death.
Service Manual
Model No.:
Chapter 1: General Information
1-1. Table of Contents
1. General Information...........................................................................1
1-1. Table of Contents 1
1-2. General Guidelines 3
1-3. Important Notice 3
1-4. How to Read this Service Manual 6
.................................................................................... 6
3. Location of Controls and Components........................................... 8
3-1. Board Location 8
3-2. Main Board & AV Board 8
3-3. Power Board 11
3-4. LCD Panel 12
4. Disassemble and Assemble.......................................................... 15
4-1 Remove the Pedestal 15
4-2 Remove the Back Cover 15
4-3 Remove the Adhesive Tape 15
4-4 Remove the Terminal Bracket 16
4-5 Remove the Power Module 16
4-6 Remove the Main Board 16
4-7 Remove the Speaker 17
4-8 Remove the Remote Control Board 17
5. Installation Instructions........................................................... 18
5-1 External Equipment Connections 18
5-2 HDMI Connections 21
6. Operation Instructions............................................................. 24
6-1 Front Panel Controls 24
6-2 Back Panel Controls 24
6-3 Universal Remote Control 25
7. Electrical Parts......................................................................... 26
7-1. Block Diagram 26
7-2. Circuit Diagram 27
7-3. Wiring Connection Diagram 35
8. Measurements and Adjustments................................................ 39
8-1. How to enter into the factory model 42
8-2. How to update software 43
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9. DVD OPERATION.......................................................................... 44
9-2. DVD Trouble Shooting 48
10. Trouble-shooting ....................................................................... 49
...
10-1. Simple Check 49
10-2. Main Board Failure Check 50
10-3. Panel Failure 57
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Service Manual
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1-2. General Guidelines
When servicing, observe the original lead dress. If a short circuit is found, replace all parts
which have been overheated or damaged by the short circuit.
After servicing, see to it that all the protective devices such as insulation barriers, insulation
papers shields are properly installed.
After servicing, make the following leakage current checks to prevent the customer from
being exposed to shock hazards.
1) Leakage Current Cold Check
2) Leakage Current Hot Check
3) Prevention of Electro Static Discharge (ESD) to Electrostatically Sensitive
1-3. Important Notice
1-3-1. Follow the regulations and warnings
Most important thing is to list up the potential hazard or risk for the service personnel to
open the units and disassemble the units. For example, we need to describe properly
how to avoid the possibility to get electrical shock from the live power supply or charged
electrical parts (even the power is off).
This symbol indicates that high voltage is present inside.It is dangerous to
make any king of contact with any inside part of this product.
This symbol indicates that there are important operating and maintenance
instructions in the literture accompanying the appliance.
1-3-2. Be careful to the electrical shock
to rain or excessive moisture. This TV must not be exposed to dripping or splashing water,
1-3-3. Electro static discharge (ESD)
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such
components commonly are called Electrostatically Sensitive (ES) Devices. The following
techniques should be used to help reduce the incidence of component damage caused by
electros static discharge (ESD).
1-3-4. About lead free solder (PbF)
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 repairing of this product.
Special parts which have purposes of fire retardant (resistors), high-quality sound
(capacitors), low noise (resistors), etc. are used.
When replacing any of components, be sure to use only manufacture's specified parts
shown in the parts list.
Safety Component
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Service Manual
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1-3-6 Safety Check after Repairment
in the original positions, or whether there are the positions which are deteriorated around
the serviced places serviced or not. Check the insulation between the antenna terminal or
external metal and the AC cord plug blades. And be sure the safety of that.
General Servicing Precautions
1. Always unplug the receiver AC power cord from the AC power source before;
a. Removing or reinstalling any component, circuit board module or any other receiver
assembly.
b. Disconnecting or reconnecting any receiver electrical plug or other electrical
connection.
c. Connecting a test substitute in parallel with an electrolytic capacitor in the receiver.
CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic
capacitors may result in an explosion hazard.
2. Test high voltage only by measuring it with an appropriate high voltage meter or other
voltage measuring device (DVM, FETVOM, etc) equipped with a suitable high voltage
probe.
Do not test high voltage by "drawing an arc".
3. Do not spray chemicals on or near this receiver or any of its assemblies.
4. Unless specified otherwise in this service manual, clean electrical contacts only by
applying the following mixture to the contacts with a pipe cleaner, cotton-tipped stick or
comparable non-abrasive applicator; 10% (by volume) Acetone and 90% (by volume)
isopropyl alcohol (90%-99% strength).
CAUTION:
Capacitors may result in an explosion hazard.
5. Do not defeat any plug/socket B+ voltage interlocks with which receivers covered by this
service manual might be equipped.
6. Do not apply AC power to this instrument and/or any of its electrical assemblies unless
all solid-state device heat sinks are correctly installed.
7. Always connect the test receiver ground lead to the receiver chassis ground before
connecting the test receiver positive lead.
Always remove the test receiver ground lead last. Capacitors may result in an explosion
hazard.
CAUTION: eiver.
9. Remove the antenna terminal on TV and turn on the TV.
10. Insulation resistance between the cord plug terminals and the eternal exposure metal
should be more than Mohm by using the 500V insulation resistance meter.
11. If the insulation resistance is less than M ohm, the inspection repair should be required.
If you have not the 500V insulation resistance meter, use a Tester. External exposure
metal: Antenna terminal Headphone jack
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Electrostatically Sensitive (ES) Devices
Some semiconductor (solid-state) devices can be damaged easily by static electricity.
Such components commonly are called Electrostatically Sensitive (ES) Devices.
Examples of typical ES devices are integrated circuits and some field-effect transistors
and semiconductor "chip" components. The following techniques should be used to help
reduce the ncidence of component damage caused by static by static electricity.
1. Immediately before handling any semiconductor component or semiconductor-
equipped assembly, drain off any electrostatic charge on your body by touching a known
earth ground. Alternatively, obtain and wear a commercially available discharging wrist
strap device, which should be removed to prevent potential shock reasons prior to applying
power to the unit under test.
2. After removing an electrical assembly equipped with ES devices, place the assembly
on a conductive surface such as aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES devices.
4. Use only an anti-static type solder removal device. Some solder removal devices not
to damage ES devices.
6. Do not remove a replacement ES device from its protective package until immediately
before you are ready to install it.
(Most replacement ES devices are packaged with leads electrically shorted together by
conductive foam, aluminum foil or comparable conductive material).
7. Immediately before removing the protective material from the leads of a replacement
ES device, touch the protective material to the chassis or circuit assembly into which the
device will be installed.
CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other
safety precautions.
8. Minimize bodily motions when handling unpackaged replacement ES devices.
(Otherwise harmless motion such as the brushing together of your clothes fabric or the
an ES device.)
1-3-7. Ordering Spare Parts
Please include the following informations when you order parts. (Particularly the Version
letter)
1. Model number, Serial number and Software Version
The model number and Serial number can be found on the back of each product and the
Software Version can be found at the Spare Parts List.
2. Spare Part No. and Description
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Service Manual
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1-3-8. Photo used in this manual
The illustration and photos used in this Manual may not base on the final design of
products, which may differ from your products in some way.
1-4. How to Read this Service Manual
Using Icons:
each icon is described in the table below:
Note:
A "note" provides information that is not indispensable, but may nevertheless be valuable
to the reader, such as tips and tricks.
Caution:
A "caution" is used when there is danger that the reader, through incorrect manipulation,
may damage equipment, loose data, get an unexpected result or has to restart(part of) a
procedure.
Warning:
A "warning" is used when there is danger of personal injury.
Reference:
A "reference" guides the reader to other places in this binder or in this manual, where he/
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Service Manual
Model No.:
Model LET-26C430 LEY-26C430
Screen Size 26inch 26inch
Aspect Ratio 16:9 16:9
Resolution 1366x768 1366x768
6.5 (GRAY TO 6.5 (GRAY TO
Response Time (ms)
GRAY) GRAY)
Angel of View 176o 176o
Color Display 16777216 16777216
No. of Preset Channels 400 400
OSD Language English English
Color System PAL/SECAM PAL/SECAM
Audio System DK, BG, I, M, L, L' DK, BG, I, M, L, L'
Audio Output Power
5W