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石英晶体具有等效电感大,电容小,Q值高,频率精确、稳定等特点。因此,在近年来生产的彩电中,石英晶体被广泛应用。石英晶体出现比较多的故障是漏电、短路、断极(内部开路)等。下面,以泰山牌 TS54C8为例(国内用该系统生产的彩电较多,如:长虹、长城、莺歌、佳丽等系列牌号),简述石英晶体在彩电中的应用,及故障表现和检修方法。例1 故障现象:按通电源后,红指示灯亮,电视机处于待命状态,(手动彩电的操作按键一切正常,)用遥控器操作(遥控器内的电池电压正常,接触良好)却不能工作,按遥控手机操作面板上的任何键红色指示灯也不闪烁。故障分析:在遥控发射器中,以IC_(001)(M50460)集成电路为核心组成发射单元,该集成电路的④脚和⑤
Quartz crystal with large equivalent inductance, small capacitance, high Q value, frequency accuracy, stability and so on. Therefore, in recent years the production of color TV, quartz crystal is widely used. Quartz crystals appear more fault is leakage, short circuit, broken pole (internal open) and so on. The following, the Taishan card TS54C8 (for example, the domestic system with more color TV sets, such as: Changhong, Great Wall, Yingge, Belle and other series), briefly describes the application of quartz crystal in color TV, and fault performance and maintenance methods . Example 1 Symptom: Press the power, the red light is on, the TV is on standby, (manual operation of the TV color buttons are all normal) with the remote control (remote control battery voltage is normal, good contact) but can not work, Press any key on the remote control keypad to blink red. Failure Analysis: In the remote transmitter, with IC_ (001) (M50460) integrated circuit as the core components of the launch of the integrated circuit ④ feet and ⑤