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42.为什么彩色电视机底板带电,而黑白电视机底板不带电? 这是因为彩色电视机大都为集成电路,多采用开关式稳压电源,它具有稳压范围大、功耗小、不用电源变压器等优点。但由于省去了电源变压器,未经隔离的市电电源使得整机底板带电,这样在维修时容易发生融电事故。而在一般黑白电视机中,由于电源变压器把机芯和电源隔离了,所以底板不带电。
42. Why is the color TV backplane charged, and black and white TV backplane is not charged? This is because most of the color TV integrated circuits, the use of switching power supply, it has a large voltage range, low power consumption, without power transformers Etc. However, due to eliminating the need for power transformers, uninsulated mains power supply makes the whole floor charged, so prone to financial maintenance accident occurred. In the general black and white TV, because the power transformer to the movement and power isolation, so the floor is not charged.