康佳T2910A型彩电接收电视信号时,图像上部拉长且出现回扫线
估计锯齿波形成电路有故障。该电路是TA8659AN 31脚的外接电路,检查相关元件VD301、RP303、RP305、R354、C321等,发现RP303、RP305接触不良。更换RP303、RP305后,故障排除。
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