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例一:一台金星牌C37-401型彩电,声、图均正常,只是光栅在屏幕的中上部有规律地发生折叠。约1s钟发生一次。分析检修:据现象判断,故障可能发生在场扫描电路。开机用万用表测量场扫描集成电路IC701(HA11235),各引脚直流电压均正常;测量场输出厚膜块M601(HM6232)的各引脚电压,发现均略低于正常值,并且在测量M601第①、②脚时,
Example 1: A Venus card C37-401 color TV, sound, the picture is normal, but the grating in the upper part of the screen regularly occur folding. Occurs once in about 1 second. Analysis and maintenance: According to the phenomenon of judgment, the fault may occur in the field scan circuit. Boot with multimeter measurement field scanning IC IC110 (HA11235), the pin DC voltage are normal; measurement field output thick film block M601 (HM6232) of the pin voltage, were found slightly lower than normal, and in the measurement of M601 ①, ② feet,