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例1:熊猫3640型彩电故障现象:屡次击穿场输出块,呈一条水平亮线。分析与检修:第一次检修时,查出是场输出块损坏,例行检查了场电路,测量电源,输出电压均无异常,换块后一切正常。交用户使用不到一个月,用户又搬来电视机,还是一条水平亮线。查还是场输出块损坏,其他无异常。换新块后又一切正常,长时间监测场供电电压正常。为了防止场电路某元件有故障引起场输出块再度损坏,把可能引起场块损坏的元件,如自举升压电容等换了4、5个,这下可放心了吧。谁知不到半个月,电视机再次因一条水平亮线送修,这下可有点傻了,自开始做维修工作以来
Example 1: Panda 3640 TV failure phenomenon: repeated breakdown field output block, was a horizontal bright line. Analysis and overhaul: The first overhaul, it is found that the output block is damaged field, routine examination of the field circuit, measuring the power supply, the output voltage are normal, after changing everything is normal. Less than a month to pay the user, the user moved to the TV, or a horizontal bright line. Check or field output block damage, no other abnormalities. After a new block everything is normal, long-term monitoring field supply voltage is normal. In order to prevent field circuit component failure caused by the field output block again damaged, the field may cause damage to the components, such as bootstrap boost capacitor for 4,5, which can rest assured. Who knows less than two weeks, the TV again for a horizontal bright line repair, which can be a bit silly, since the beginning of maintenance work