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东芝3429KTP型彩电,出现光栅压缩且呈枕形,线性上疏下密故障,初步判为场输出电路有故障。开机检测IC301场输出块TA8427K各引脚电压,除④脚(场振荡输入)电压异常外,其余各脚电压均正常,换新后故障不变。继续检测IC302(TA8859P)和引脚直流电压,均在正常范围之内,仔细检测各引脚外接元件(尤其电容),用替换法,当用电容并在IC302的(15)脚电容C322上时,上述故障有较大改变,拆下(15)脚电容C322,测量C322时,已无充放电能力,代换C322后,故障排除。
Toshiba 3429KTP-type color TV, a raster compression and pincushion, dense linear failure, initially ruled that the field output circuit is faulty. Boot detection IC301 field output block TA8427K the voltage of each pin, in addition to ④ feet (field oscillation input) voltage anomalies, the rest of the voltage of the legs are normal, the new fault does not change. Continue to test the IC302 (TA8859P) and the pin DC voltage are within the normal range, carefully test the pin external components (especially capacitors), with replacement method, when using the capacitor and IC302 (15) pin capacitor C322 , The above failure has a greater change, remove (15) foot capacitor C322, measuring C322, no charge and discharge capacity, substitution C322, troubleshooting.