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上门检修一台长虹 D2117A 彩电,故障为有光栅、无图像、无伴音,也无字符。遥控及本机按键均失效。因检修方法欠妥,检修过程走了不少弯路。现详述如下,以示读者。从故障现象分析,很显然是 CPU 没有工作引起的。一套 CPU 电路要正常工作,必须具备以下几个条件:电源电压(+5V)输入正常、复位(清零)电平正常、
Home overhaul a Changhong D2117A color TV, the fault is a grating, no images, no sound, no characters. Remote control and the machine keys are invalid. Due to improper maintenance methods, maintenance process took a lot of detours. Details are as follows to show readers. Analysis from the failure phenomenon, it is clear that the CPU is not caused by the work. A set of CPU circuit to work properly, must have the following conditions: power supply voltage (+5 V) input is normal, reset (clear) level is normal,