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例18 晶振漏电,导致CPU工作失常而启动困难故障:一台长虹C2167彩电,出现冷机容易启动,热机启动困难,启动后,又容易出现遥控失灵、屏幕混乱的现象。检修:从现象看,故障可能在CPU电源控制电路。开机在不启动时,查CPU(CH1001)⑧脚为低电平,说明CPU未下达开机指令,再查CPU正常工作的三个条件:(42)脚+5V,(33)脚复位端正常,让(33)脚瞬间对地短
Example 18 crystal leakage, leading to CPU malfunction and start difficult Fault: a Changhong C2167 color TV, cold machine easy to start, start the heat machine is difficult, after the start, but also prone to remote control failure, the screen chaos phenomenon. Maintenance: From the phenomenon of view, the fault may be in the CPU power control circuit. Boot does not start, check the CPU (CH1001) ⑧ pin is low, indicating that the CPU did not issue a boot command, and then check the CPU to work in three conditions: (42) +5 feet, (33) feet reset normal, Let (33) feet short to the ground