820-01418 - U7370 keeps shorting PPBUS_G3H to PPVCCSA_S0_CPU

[overshoot]

Hi,

I have that board that was liquid damaged.
I have already replaced U7370 as it was shorting PPBUS_G3H to PPVCCSA_S0_CPU.
The chip is an SIC532 but showing up as SIC535CD on the 820-01041 schematics (pretty close to the 820-01418)

Board was then working fine. I could use it for a day or so.
Then again, same short, same dead IC.

After replacing it again, board would work again.
I did replace that chip 3 times already (and it's no fun cause it seats between CPU and GPU)
So my question is: what can cause that IC to die over and over again?

Could it be the CPU draining to much amperage?

 

[overshoot]

I have 14 ohms to ground on PVCCSA_S0_CPU (same value with another working board)

 

[2informaticos]

Check/replace R/C7379.

 

[overshoot]

Thanks! I'll try that on Monday.

Can I please ask you how you got to that conclusion please?

 

[2informaticos]

I cannot assure that is your problem.
But bootstrap circuit can damage high-side MOSFET in time; if doesn't assure correct voltage Vgs.

 

[overshoot]

You were very close. It was R7375 that was off value.

 

[2informaticos]

I supposed you have correct power at U7370.
Higher value on R7375 will impede correct working, of course.