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例1 机型:日立CPT2157SF/DU彩电故障现象:缺红色字符显示。分析与检修:开机后有正常的彩色图像和伴音,红色字符显示则时有时无。此故障可能是某元器件接触不良或虚焊,查红色字符显示支路各元件无接触不良和虚焊,换Q802无效,试换IC1104字符显示集成块,故障消失。例2 机型:同上故障现象:搜台不正常。分析与检修:自动搜台时,搜索到的电视图像一晃而过。据此推断IC1101 CPU微处理器未检测到同步信号,否则,搜索到的电视机图像会有短暂停留。用示波器测微处理器(31)脚在自动搜台时无同步信号出现,查
Example 1 Model: Hitachi CPT2157SF / DU TV Fault phenomenon: lack of red character display. Analysis and Overhaul: After boot with a normal color image and sound, the red character sometimes shows no time. This failure may be a component of poor contact or Weld, check the red characters show the components of each branch without contact bad and Weld, Q802 invalid, try IC1104 character display manifold, the fault disappears. Example 2 Model: Ibid Fault phenomenon: Search Taiwan is not normal. Analysis and overhaul: automatically search the station, the search to the television image by. It is inferred that IC1101 CPU microprocessor does not detect the synchronization signal, otherwise, the search for the TV image there will be a short stay. Microprocessor with an oscilloscope (31) feet in the automatic search of the station without synchronization signal appears, check