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例l 一台三健NC-T953FS‘Ⅲ型彩电故障现象:该机使用几年后,出现开机、图、声均正常,十分钟后,图象左右两边开始收缩,且图像下部出现两条细亮线。若将电视机置于空频道,光栅能满幅。 分析:从故障现象看,该机为扫描故障。对于场扫描,因故障不明显,检修时可先不予考虑,而行扫描则较为明显。影响行幅的主要因素一是行偏转电流大小;二是显像管阳极电压;三是枕校电路。 检修:打开后盖,开启电视机,收看至故障出现,进行如下测试和检查(图1)。
Case l a San Jian NC-T953FS’Ⅲ type TV failure phenomenon: the machine after a few years, the boot, the picture, the sound is normal, ten minutes later, the image began to shrink on both sides, and the lower part of the image appears two thin Bright line. If the television set in the empty channel, grating full scale. Analysis: From the phenomenon of failure, the aircraft is a scanning failure. For field scanning, due to failure is not obvious, overhaul can not be considered, while the line scan is more obvious. One of the main factors affecting the amplitude of the line is the deflection current; the other is the anode voltage of the picture tube; the third is the circuit of the pillow school. Maintenance: open the back cover, turn on the TV, watch until the fault appears, the following test and inspection (Figure 1).