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故障现象 开机出现“三无”,但机内伴有“噗噗”声,数秒钟后,响声渐弱至无。重复开机,无任何声音。 分析与检修 从现象看,故障出在电源电路和行扫描电路。打开机器,发现伴音电路低频功放部分电路板局部烧焦,铜箔翘裂,功放管Q401、电阻R409、R410、R408、R057焊点烧毁。测以上元
Failure phenomenon boot “three noes”, but the machine accompanied by “puff puff” sound, a few seconds later, the sound faded to nothing. Repeated boot, no sound. Analysis and maintenance From the phenomenon of view, the fault lies in the power circuit and the line scan circuit. Open the machine and found that the audio circuit part of the low frequency power amplifier circuit board partial burning, copper foil cracking, power amplifier tube Q401, resistance R409, R410, R408, R057 solder joint burned. Measured above yuan