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TPS6508641电源芯片输出不正常

Other Parts Discussed in Thread: CSD87381P

 如图所示目前我只焊接了软起动芯片及TPS6508641电源芯片及BUCK1电路还有必要电容,其他均无焊接,但是输出电压为1.4V,请问是什么问题;

同时想知道在哪里可以看到DRVL/DRVH/SW等管脚正常输出时的电压;谢谢;