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一、电源电路原理分析与维修方法1.准备工作(1)了解LCD(液晶显示)电源规格;(2)了解主要集成电路(IC)的功能及各脚电压范围;(3)了解LCD电源线路图、工作原理、各单元电路原理、动作条件和过程;(4)了解各种关键组件的参数。2.故障判定方法(1)外观法观察晶体是否炸裂,元器件有无靠在一起,元器件引脚与本体及所点胶有无变色,元器件有无松脱、过分倾斜,电解电容是否漏液,PCB(印刷电路板)是否有焊盘虚焊,有无锡丝锡珠,有无元件脱脚、短路,SMT(表面贴装技术)焊盘是否偏位。
First, the power circuit principle analysis and maintenance methods 1. Preparations (1) to understand the LCD (liquid crystal display) power specifications; (2) to understand the main integrated circuit (IC) function and voltage range of each foot; (3) to understand the LCD power supply line Figure, working principle, the principle of each unit circuit, operating conditions and processes; (4) to understand the parameters of various key components. 2. Failure to determine the method (1) the appearance of the law to observe whether the crystal burst, with or without components together, the components of the pin and the body and the dispensing with or without discoloration, the components are loose, too inclined, electrolytic capacitors are Leakage, PCB (Printed Circuit Board) Whether there is pad Weld, solder wire tin beads, with or without components off, short circuit, SMT (surface mount technology) Whether the offset pad.