彩电开关电源常见故障维修方法（国外英文资料）.docVIP

彩电开关电源常见故障维修方法（国外英文资料） The common fail-repair method for the mains power switch is very good, and the visitors sign up for the registration Home page project resource library components are described in the this paper The house of maintenance Make electronic experimental study garden technology dole shopping network download page window - home of maintenance and repair skills - audio and video equipment Background: read the content The method of common failure maintenance of color switch power supply [date: 2010-08-29] source: author: guo yongzhong of gansu province [font size: large medium small] Burning tube The common reason is: (1) the rectifier tube or in parallel with the surge capacitor; (2) large filter capacitance breakdown; (3) switching tube breakdown; (4) the demagnetization resistance is broken or the temperature characteristic is lost. Maintenance: (1), (2), (3) why can quickly find out through the resistance measurement method, such as the road resistance to more normal (4) cause, can disconnect or replace the experiment. (1), (2), (4) why change for the new components, only when the switch tube breakdown must find out breakdown reason carefully, otherwise it will repeatedly destroyed switch tube, increase the maintenance cost or expanding the scope of the fault, cause needless loss. Switch tube breakdown maintenance (1) the common reasons are: 1) sampling and error amplifier, the datum zener diode, photoelectric coupler, error amplifier, frequency and width control tube as long as either open or pipe cut-off (such as open circuit) bias resistors, all can make the switch tube is out of control, guide through the deep, secondary voltage up to the highest of all stripes and burned load component, even burned power supply itself. 2) the load (including the secondary rectifier tube) was severely short-circuited. 3) the capacitance and resistance of the anti-peak voltage, such as capacitance, resistance, or capacitor failure, the reverse peak voltage is t