Defective generator, problem Nano V2

Products & Technology DSO Nano
9

Hello,

My board version: DSO201V2.5

I placed Ground Volt meter probe on USB shield and Red to VCC of 74HC125 pin 14 then 8

Fuction Gen Out=0.8v

74HC125:
Pin 8=0.8v
Pin 14=3.7v

Thank’s for help me.