TCL2966彩电,开机伴音正常,图像行幅过大,左边的台标显示溢出屏外,右边的时间显示也溢出三分之一。根据经验判断故障在行输出枕校电路,开机查枕校电路没发现异常,调整行幅电位器 VR1405和VF1406屏幕没变化。测 L1405上端电压近0 V,查C1451、C423和 D421,发现 D421击穿短路,用一只FR104快恢复二极管换上,微调 VR1405和 VR1406后 TCL2966 color TV, boot sound normal, the image line is too large, the left of the screen shows the overflow screen, the right time display also overflowed by one-third. Based on experience to determine the fault line output pillow school circuit, boot check school circuit found no abnormalities, adjust the line amplitude potentiometer VR1405 and VF1406 screen did not change. Measured L1405 voltage near 0 V, check C1451, C423 and D421, found D421 breakdown short-circuit, with a FR104 fast recovery diode replaced, trimmed after VR1405 and VR1406