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  • Publicado : 29 de mayo de 2011
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LCD TELEVISION

LC-23Y18

America

CONTENTS Safety instructions………………………………………………………………………..… 1 Adjustment instruction …………………………….…….…………………………….… 3 Trouble shooting ……………………………………………………….……………………5 Method of software upgrading ………………………………………….…….……………7 The unit working principle analysis……………………………….………….…………. 10 Block diagram…………………………………..………………………………..………… 11 IC blockdiagram………………………………………………………………………..……12 Identification criteria for the bright spot and dark spot of the LCD screen………..…. 17 Wiring diagram ……………………………………………………………..……………... 18 Troubleshooting charts………………………………………………………………..…… 19 Schematic diagram ……………………………………………………………….….. APPENDIX-A: Exploded View APPENDIX-B: Main assembly list 22

Attention: This service manual is only for service personnel to take reference with. Beforeservicing please read the following points carefully.

Safety instructions
1. Instructions
Be sure to switch off the power supply before replacing or welding any components or inserting/plugging in connection wire Anti static measures to be taken (throughout the entire production process!): a) Do not touch here and there by hand at will; b) Be sure to use anti static electric iron; c) It’s amust for the welder to wear anti static gloves. Please refer to the detailed list before replacing components that have special safety requirements. Do not change the specs and type at will.

2. Points for attention in servicing of LCD
2.1 Screens are different from one model to another and therefore not interchangeable. Be sure to use the screen of the original model for replacement. 2.2 Theoperation voltage of LCD screen is 700-825V. Be sure to take proper measures in protecting yourself and the machine when testing the system in the course of normal operation or right after the power is switched off. Please do not touch the circuit or the metal part of the module that is in operation mode. Relevant operation is possible only one minute after the power is switched off. 2.3 Do not useany adapter that is not identical with the TV set. Otherwise it will cause fire or damage to the set. 2.4 Never operate the set or do any installation work in bad environment such as wet bathroom, laundry, kitchen, or nearby fire source, heating equipment and devices or exposure to sunlight etc. Otherwise bad effect will result. 2.5 If any foreign substance such as water, liquid, metal slices orother matters happens to fall into the module, be sure to cut the power off immediately and do not move anything on the module lest it should cause fire or electric shock due to contact with the high voltage or short circuit. 2.6 Should there be smoke, abnormal smell or sound from the module, please shut the power off at once. Likewise, if the screen is not working after the power is on or in thecourse of operation, the power must be cut off immediately and no more operation is allowed under the same condition. 2.7 Do not pull out or plug in the connection wire when the module is in operation or just after the power is off because in this case relatively high voltage still remains in the capacitor of the driving circuit. Please wait at least one minute before the pulling out or pluggingin the connection wire. 2.8 When operating or installing LCD please don’t subject the LCD components to bending, twisting or extrusion, collision lest mishap should result. 2.9 As most of the circuitry in LCD TV set is composed of CMOS integrated circuits, it’s necessary to pay attention to anti statics. Before servicing LCD TV make sure to take anti static measure and ensure full grounding for allthe parts that have to be grounded. 2.10 There are lots of connection wires between parts behind the LCD screen. When servicing or moving the set please take care not to touch or scratch them. Once they are damaged the screen 1

would be unable to work and no way to get it repaired. 2.11 Special care must be taken in transporting or handling it. Exquisite shock vibration...
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