(820-2850) PP3V3_S0 Issue

[iywdde]

Hi, im stucked in a 2850:

PPBUS OK
PP3v3_S5 OK
PP5V_S5 OK

PP3V3_S3 OK

PP5V_S3 NOT OK (Enable signal Pulsing)
PM_SLP_S4_L Pulsing
PM_SLP_S3_L Pulsing

ALL RTC Signal presents

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When remove Q7830 (3.3V S0 FET) or Q7812 (Enable signal for Q7830) (see attached image) I have full speed fan spin and PM_SLP_S4_L and PM_SLP_S3_L are stable , I tried change these two components with same result, so the problem I think is in the PP3V3_S0, not shorted rail, any idea how to proceed in this case?

Thanks.

[Duranitron]

Re: (820-2850) PP3V3_S0 Issue

can you tell us the original problem so that we can relate.. and what did you done so far..

[iywdde]

Re: (820-2850) PP3V3_S0 Issue

can you tell us the original problem so that we can relate.. and what did you done so far..

Thanks for your answer, it does not seem damage by liquid, nothing worked, tested all the RTC rails, luckily lifting components related to PM_SLP_S4_L I discovered that the problem seems to be in PP3V3_S0, since without that active rail I already have a fan at full speed.

I think the only way is to lift each component related to PP3V3_S0 but there are many, I don't know if is possible try to solve it in another way in this case.

Thanks.

[iywdde]

Re: (820-2850) PP3V3_S0 Issue

Finally crystal issue,Y3500, no problem in 3V S0 rail.