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ucd74120无输出FLT低电平

Other Parts Discussed in Thread: UCD74120, UCD9248, UCD7242

ucd9248第一路两个ucd74120并在一起,第二路和第三路接ucd7242,第四路接一个ucd74120,ucd74120全都没有输出,第四路ucd74120 FLT引脚置高,第一路两个ucd74120 FLT引脚底电平,请问有没有什么办法可以测ucd74120哪里有问题啊,无输出,FLT还低电平,有遇到过的吗,有没有好的测试办法请指教