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TPS51225: Output short to GND

Part Number: TPS51225

Dear Teams,

My customer is using TPS51225, and the schematic diagram attached here. Normally, it has 12V input and 5V & 3.3V dual output. The 3.3V will used as a power supply for the CPU. Previously, they are running everything fine. However, one day, the 3.3V output voltage short to GND when they power up with 12V. Then, my customer removed the CPU, then there still has no 3.3V output voltage. Based on testing, they think the TPS51225 broken, which further caused the CPU broken out. 

Could you give some suggestion where they should test, and what is the testing procedure, and how to debug?

V3P3_A.pdf

Thanks!

Dylan