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lm358光电转换电路,焊接上去后有20%的芯片不能正常工作

Other Parts Discussed in Thread: LM358

电路图如下,光电二极管接收到的光信号只有15us,信号很弱,经过放大和比较器直接进入单片机

问题如下,为什么我焊了几十个这样的电路,有20%lm358没信号出来,换掉lm358后,又能正常工作。(注:焊的时候也有大概20%左右的是不成功的)。其余的都正常。