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机型:翔字牌EC-227D彩电故障现象:开机出现一条水平亮线。分析检修:此机故障肯定在场扫描电路。测场输出管Q_(310)的集电极电压为0,发现其供电电路中的保险电阻R_(422)烧焦。换上10Ω/0.5W保险电阻,光栅恢复正常,但只有5分钟又被烧开路,证明此部分可能有短路元件。这时可再换一只普通10Ω电阻,在其二端并接10V直流电压表再开机,开机时电表指示为0.9V,很快逐渐变大到2.5V以上,可能场输出供电滤波电容软击穿,把C_(310)(47μF/160V)取下,换一只新电容,电视机不再出现此
Model: Xiang Zi EC-227D TV failure phenomenon: a bright horizontal line boot. Analysis and maintenance: This machine is certainly the fault field scanning circuit. The collector voltage of the output tube Q_ (310) of the field test is 0, and the fuse R_ (422) in the power supply circuit is found to be scorched. Put 10Ω / 0.5W fuse, the grating returned to normal, but only 5 minutes and was boiled again, proving that this part may have short-circuit components. At this time, you can replace another ordinary 10Ω resistor, and then turn on the 10V DC voltmeter at both ends of the meter. When the meter is turned on, the meter indicates 0.9V, and then gradually increases to over 2.5V. Wear, remove the C_ (310) (47μF / 160V), replace a new capacitor, the TV will no longer appear