HMC988

I purchased the HMC988LP3E chip and soldered the circuit board by myself, following the picture of the evaluation board provided by your company. Given input, no output can be measured. In the DATASHEET of chip HMC988LP3E, default THE DEVISION ratio select is /4. it means the frequency division is 4, so the input / output should be 4. However, I give the input ,but i can not measure the output.

May I ask what is the reason. Thank you