AMC7908EVM: Negative Output by AMC7904EVM setup and DAC0~3 aways keep 4.78V by positive mode

Tool/software:

Hi all,

I set up AMC7904EVM by User Guide.

1. Remove Jumper J10

2. Intall Jumper J11 to VCC-GND

3. Intall Jumper J9

4. Use  power supply, provide -5V to  EVM (  - connect black connector of EVM and + connect yellow connector of EVM)

USB2ANY connect EVM and get error message -44. what's problem by my setup?

then I test positive mode :

 1. Remove J9

 2. install J10 

 3. install J11 for GND-VSS 

4. Use  power supply, provide 5V to  EVM (   + connect red connector of EVM and - connect black connector of EVM)

USB2ANY connect EVM and success to read register. but the local temp show 90C. Is it  too high, right?

My probelm:

1. Disable LUT, to set DAC0/1/2/3OW_EN and write register 0x0000~0x00FF, the voltage always keep 4.78V

base on my test: Is the EVM board  broken?