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1.“串入电流表法”修复一台康佳 T2587H 型彩电“枕形失真”故障故障现象:行幅严重不足且伴有“枕形失真”。分析与检修:行幅严重不足,初步判断行输出级存在短路现象。断开行输出变压器的③脚,测+B 电压为133V,正常。参照图1。在行输出变压器的①脚串入一只500 mA 的电流表,通电,指针超过最大量程,表明行输出级的确存在短路现象。拔掉行偏转线圈插头后电流降为440 mA,说明故障不在行偏转线圈。枕校电路有短路现象,经查,发现 C432已击穿短路,更换后,故障排除。
1. “string into the ammeter method” to repair a Konka T2587H color TV “pincushion” failure Symptoms: a serious lack of line and accompanied by “pincushion distortion.” Analysis and overhaul: a serious shortage of lines, initially determine the output line short-circuit phenomenon. Disconnect the line output transformer ③ feet, measuring + B voltage is 133V, normal. Refer to Figure 1. In the line output transformer ① foot into a 500 mA ammeter, power, the pointer exceeds the maximum range, indicating that the output line does exist short-circuit phenomenon. After unplugging the line deflection coil plug the current drops to 440 mA, indicating that the fault line deflection coil is not. Pillow school circuit has a short circuit, the investigation found C432 breakdown breakdown, replacement, troubleshooting.