厦华 lc30d9 lc40d9 液晶维修手册.pdfVIP

COLOR TELEVISION LC30/40D9 CONTENT Safety instructions………………………………………………………………………..… 1 Instructions on adjusting and testing…………………………….…….………………… 2 Trouble shooting……………………………………………………….…………………… 6 Method of software upgrading………………………………………….………………… 8 Briefing on LC30/40D9 and its working principle……………………………………..… 10 IC BLOCK DIAGRAM……………………………………………………………..………. 12 Wiring diagram……………………………………………………………..…………… 22 Serial NO. of parts……………………………………………………………………….… 23 Identification criteria for the bright spot and dark spot of the LCD screen………..…. 23 Troubleshooting guide………………………………………………………………..…… 24 Exploded views…………………………………………………………………………..… 27 Schematic diagram…………………………………………………………………….….. 32 Attention: This service manual is only for service personnel to take reference with. Before servicing please read the following points carefully. Safety instructions 1 Instructions 1.1 Be sure to switch off the power supply before replacing or welding any components or inserting/plugging in connection wire 1.2 Anti static measures to be taken (throughout the entire production process!): 1.2.1 Do not touch here and there by hand at will; 1.2.2 Be sure to use anti static electric iron; 1.2.3 It’s a must for the welder to wear anti static gloves. 1.3 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 The operation 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