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[例1]故障现象 襄阳51XC1型彩电,屏幕显示的功能字符向左偏移,开机时间越长,偏移也越严重。 分析与检修 本机采用东芝CTS—130型遥控系统,有关电路如图1所示。屏幕显示需要有一个由振荡器产生的振荡信号和行、场同步信号,这三个信号决定字符在屏幕上的显示位置和大小。行、场同步信号在电视机中是固定不变的,所以,字符在屏幕上的位置就由振荡器的振荡频率来决定。频率偏高,字符向左偏移,频率偏低,字符向右偏移。因此,本例故障应重点检查由VR775、C776、R766和IC702(13)、(14)、(15)脚内部电路组成的振荡电路。 本机除了字符显示位置偏移外,无其他异常现象,由此
[Example 1] Symptom Xiangyang 51XC1 color TV, the screen displays the function of the left shift to the left, the longer the boot time, the more the offset. Analysis and Maintenance The machine uses Toshiba CTS-130 remote control system, the circuit shown in Figure 1. The screen shows the need to have an oscillating signal generated by the oscillator and the line, field sync signal, these three signals determine the position and size of the characters on the screen display. Line, field sync signal in the TV is fixed, so the position of the character on the screen by the oscillation frequency of the oscillator to decide. High frequency, character left offset, low frequency, character offset to the right. Therefore, in this case, the fault should focus on checking the oscillation circuit composed of VR775, C776, R766 and IC702 (13), (14), (15) foot internal circuit. This machine in addition to character display position offset, no other abnormalities, thus