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[例1]故障现象 开机后无光栅、无伴音,待机指示灯一直处于点亮状态,按遥控器待机键无控制作用。 故障检修 用导线短接D811两端,整机可正常工作,拆去D811两端短路线,测S84③脚电压,其值由正常值4.7V降为2.6V、拔下S84,再测其③脚电压为3V。故障原因是:C811(10μF)容量明显减小且严重漏电。 [例2]故障现象 同例1。 故障检修 测IC801④脚电压为40V(正常值应为113V),测Q810集电极电压为300V(正常),边按动遥控器待机键边测量Q810发射极电压,此电压一直为5V,正常时,
[Example 1] Symptom No raster after boot, no sound, the standby light is always lit, press the remote control standby button without control. Troubleshooting wire short D811 ends, the whole machine can work, remove the short circuit at both ends of the D811, measured S84 ③ pin voltage, the value dropped from the normal 4.7V to 2.6V, unplug the S84, and then test its ③ pin Voltage is 3V. Fault reason is: C811 (10μF) significantly reduced capacity and serious leakage. [Example 2] Trouble phenomenon Same as Example 1. Troubleshooting test IC801 ④ pin voltage is 40V (normal value should be 113V), measuring Q810 collector voltage is 300V (normal), while pressing the remote control standby button measuring Q810 emitter voltage, the voltage has been 5V, normal,