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机型:一台夏普C—1803CK彩电故障现象:在收看中图像忽然跳动,然后向中心收缩,出现“三无”。分析与检修:造成“三无”故障主要原因为:①电源电路,②行扫描电路。打开机壳首先检查电源电路,发现电源厚膜块(电原理图为IX0323CE)实物为STR4090S①脚、②脚对④脚地击穿,电阻R701 5W 6.8Ω断,更换以上元件后开机发现偏转线圈打火,马上关机。对偏转线圈位置做记号,拆下偏转线圈,发现行偏转线圈有一处烧焦。由于本地没有该元件销售,故而做应急修理,先将烧焦处线圈一圈一圈小心地拨开,
Model: a Sharp C-1803CK color TV Fault phenomenon: suddenly watched the image beating, and then shrink to the center, there “three no.” Analysis and Maintenance: Caused by the “three no” main fault because: ① power circuit, ② scan circuit. Open the case First check the power circuit and found that the power thick film block (power schematic for the IX0323CE) in-kind STR4090S ① feet, ② feet on the ground breakdown, resistance R701 5W 6.8Ω broken, replace the above components boot found deflection coil Fire, shut down immediately. Mark the position of the deflection yoke, remove the deflection yoke, and find that the yoke of the deflection yoke burns. As the local sales of the components, so do emergency repairs, burned first coil carefully around the circle aside,