TPS65137AS: After adding the load, there is no output

Part Number: TPS65137AS

Tool/software:

Hi  Sir  : 

We have found an issue with TPS65137ASDSCR regarding this chip, which is that when unloaded, the output positive and negative voltages are correct, but when connected to a screen load, both positive and negative voltages disappear. What could be the possible reason for this ?

Yellow is VCC, green is ELVDD