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Service Manual
AKAI
27"/ 30" Wide Screen
LCD Multi-Media Display
LM-H27CJSA
LM-H30CJSA
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Table of Contents
1. Safety and Precautions ..................................................................1
2. Specifications.............................................................................................3
2.1 Specification for 27".............................................................3
2.2 Specification for 30".............................................................4
2.3 PC I/P Preset Timing Table..........................................................5
3. Connection & Applications...........................................................................6
4. Controls Location .............................................................................................8
5. Remote Control..................................................................................................9
6. Disassembly Instructions.........................................................................12
7. Block Diagram............................................................................................18
8. Troubleshooting.........................................................................................19
8.1 Symptom Codes ( for Call center use). ................................19
8.2 Flow Chart ( for Repair center use) .................................22
9. Electronic Circuit Description.....................................................................27
10. Circuit Diagram..........................................................................................32
10.1 Main Board..................................................................32
10.2 Key , LED&IR Board ....................................................42
10.3 Tuner Board............................................................43
10.4 I/O Board...............................................................44
11. PCB Layout...............................................................................................45
11.1 Main Board PCB........................................................45
11.2 Key , LED&IR Board PCB..........................................47
11.3 Tuner Board PCB.....................................................47
11.4 I/O Board PCB.........................................................48
12. Electrical Parts List..................................................................................49
13. Mechanical Disassembly...............................................................................57
14. Mechanical Parts List.................................................................................59
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1. Safety and Precautions
CAUTION
* The service of this LCD TV must be carried out by qualified persons only.
* Do not change any module unless the set is switched off.
CLEANINGAlways disconnect unit from mains supply before attempting to clean it.
Use soft cloth moistened with soapy water, wipe gently. Do not use
solvents of abrasive materials.
SOME DO'S AND DON'T'S ON THE SAFE USE OF EQUIPMENT
This equipment has been designed and manufactured to meet European
safety standards but like any electrical equipment, care must be taken if
you are to obtain the best results and safety is to be assured.
Do read the operating instructions before you attempt to use the equipment.
Do ensure that all electrical connections (Including the mains plug, extension leads and
interconnections between pieces of equipment) are properly made in accordance with
the manufacturer's instructions. Switch off and withdraw the mains plug when making
or changing connections.
Do use only the Power Cord and Power Supply (option) provided.
Do consult your dealer if you are ever in doubt of the installation, operating, or safety of
your equipment.
Don't exert pressure on the LCD TV . This could break the panel .
Don't continue to operate the equipment if you are in any doubt about it working
normally, or if it is damaged in any way. Switch off, withdraw the mains plug and consult
your dealer.
Don't remove any fixed covers as this may expose dangerous voltages.
Don't leave equipment switched on when it is unattended unless it is specifically stated
that it is designed for unattended operation or has a standby mode. Switch off using the
switch on the equipment and make sure that everyone knows how to do this. Special
arrangements may need to be made for infirm or handicapped people.
-1-
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Don't listen to headphones at high volume, as such use can permanently damage your
hearing.
Don't obstruct the ventilation of the equipment, for example, with curtains or soft
furnishings. Overheating will cause damage and shorten the life of the equipment.
Don't allow electrical equipment to be exposed to rain or moisture.
Above all
Never let anyone push anything into holes, slots or any other opening as this could
result in a fatal electric shock.
Never guess or take chances with electrical equipment of any kind.
It is better to be safe than sorry!
WARNINGTO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE. DANGEROUS
HIGH VOLTAGES ARE PRESENT INSIDE THE ENCLOSURE. DO NOT
OPEN THE CABINET. REFER SERVICING TO QUALIFIED
PERSONNEL ONLY.
-2-
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2. Specifications
2.1 Specification for 27":
ITEMS SPECIFICATION
Screen size 27" Wide TFT-LCD Panel (CMO)
Aspect Ratio 169
Resolution 1280 x 720 (Wide-XGA)
Contrast Ratio 500 : 1 (Typical)
Display
Brightness 500 cd/m