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机型:星海51CJ3Y遥控彩电故障现象:开机后光栅上出现四条间隔不等的稀疏扫描线带,并由下向上缓慢移动;加信号后机内发出刺耳的“吱吱”声,频繁出现自动关机的现象。分析检修:用万用表监测开关电源输出电压和整机电流,基本正常,怀疑故障在场扫描。经查锯齿波形成电容C_(247),场输出供电的C_(302),C_(303)和C_(306)等,还查了场线性补偿回路和防止场自激元件,结果是一无所获,故障依旧。考虑“吱吱”声来自电源,重点还应检查电源。此
Model: Xinghai 51CJ3Y remote color TV Fault phenomenon: After boot on the grating appeared four sparse scan lines ranging from the interval, and slowly moving from the bottom up; plus signal issued a harsh “creak” sound, frequent automatic shutdown The phenomenon. Analysis and Maintenance: Monitor with a multimeter output voltage switching power supply and the whole current, basically normal, suspect the presence of fault scanning. The sawtooth wave forms a capacitor C_ (247), the field output power C_ (302), C_ (303) and C_ (306), also check the field linear compensation circuit and prevent field self-excited components, the result is nothing, fault still. Consider the “creak” sound from the power supply, the focus should also check the power supply. this