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故障现象:一台TCL2568型电视机出现左右枕形失真故障,屏幕左右两边向中间内陷进约6cm无光栅,但其伴音和屏幕中间的图像、色彩、亮度都正常。分析与检修:从故障现象来看,判断故障在东西校枕电路,它主要由三极管Q1403-Q1407及其周围元件等组成,具体电路如图1所示电路主要工作原理是:从场扫描电路输出的场频锯齿波信号经电容C1458耦合,直接送到了三极管Q1407的基极,经Q1407放大后加到了由Q1405、Q1406组成的抛物波形成电路,经抛物波形成电路放
Symptom: A TCL2568-type TV about pincushion distortion occurs, the left and right sides of the screen into the center of about 6cm into the grating, but the sound and the middle of the screen image, color, brightness are normal. Analysis and Maintenance: From the point of view of the fault, to determine the fault in the West pillow circuit, which is mainly composed of the transistor Q1403-Q1407 and its surrounding components, the specific circuit shown in Figure 1 The main working principle of the circuit is: from the field scan circuit output Field frequency sawtooth wave signal coupling capacitor C1458 directly to the base of the transistor Q1407 by Q1407 amplified by the Q1405, Q1406 composed of a parabolic circuit formed by the parabolic formation of the circuit