无法预测需要挑开多少片IC后,才能找到故障IC。CPU主板元件焊接的“精致程度”已艰接近于手机的线路板,IC电路全为贴片元件,将IC引脚的铜箔条说成比头发丝还细,甚至于都不算是夸张。手底一不小心,挑掉铜箔条的话,想接起来都比较困难,挨片挑,这个法子也太笨了。
由于变频器的开关电源本身负载能力有限,接于故障电路时会引发过流保护,使开关电源停止输出。故采用外接容量较大的+5V电源,串接5Ω5W限流电阻接到CPU主板上,通电几分钟后,用手触摸CPU主板上的IC芯片,哪片烫手,有异常温升,即是哪片IC已经坏掉了。
这个法还真灵,挑开两片有异常温升的IC供电引脚,测其引脚电阻,均在十几Ω左右。此时再测+5V电源输出端,已经是数百Ω的正常阻值了。
这是个好法子,算是将错就错或将计就计或顺势而为,利用外接+5V供电,既对好的IC没什么危害,又使坏IC持续升温,暴露在我手指的“测温仪”下。特别适宜于检测CPU主板上出现的IC短路故障。
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