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故障现象:该机为转修机,送修时“三无”,机内有“吱吱”声。分析与检修:经查是行输出变压器初级与次级(地)短路,更换行输出变压器后.出现图、声,但图像尺寸过大,光暗,更换枕校电路中的C466(4.7μF/50V),图像尺寸基本恢复正常,但仍光栅较暗,调加速极至正常亮度,又出现回扫线,且随电网电压下降波动,光栅大幅收缩,图、声不稳。同时,在图像上不时出现类似喇叭状、萝卜状、指头状等不规则黑块,并不断变化,
Symptoms: This machine is to repair the machine, repair the “three noes”, the machine has “creak” sound. Analysis and overhaul: the investigation is the line output transformer primary and secondary (ground) short circuit, replace the line after the output transformer appears Figure, sound, but the image size is too large, dark, replace the pillow school circuit C466 (4.7μF / 50V), the image size basically returned to normal, but the grating is still dark, adjust the speed to normal brightness, and the flyback line appears, and with the grid voltage drop fluctuations, grating sharp contraction, the picture, sound instability. At the same time, from time to time appear in the image similar to trumpet, radish, finger-like irregular black, and constantly changing,