820-00165 PPBUS 15V

[2informaticos]

Check R7631 and R/C7630.
Change Q7630 and U7600 at same time.

 

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just to be sure, I removed L7630 and the short is on PIN 2 in diode mode PIN 1 is .248
it´s dead right?

 

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is there a way of protecting the cpu/pch when testing with the PSU? I´ve had now 2 of the same year and model which ended being PCH. It´s frustrating, because it was off, but I don´t know if maybe something I did kill it... Thanks for your comments...

 

[2informaticos]

You didn't have short to ground on L7630 before?
What is the exact ohm value of that short now?

 

[2click]

L7630 PIN 1 0.5 ohm, PIN 2 10 Kohm

 

[2informaticos]

You said short on pin 2 before...

 

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sorry I missed that one... so is there anything to do? Hail Mary maybe?

 

[2informaticos]

If short is on pin2/L7630 (as expected), PCH (CPU) has been killed because of shorted Q7630; overvoltage coming from PPBUS_G3H.

 

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Ok, to avoid this happening in other motherboards of this model, what can be done?

 

[2informaticos]

That should not happen by itself.
You should protect the board against liquid spill and high humidity ambient.

 

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I meant, while I am working on them to not kill them when I connect the charger, that could happen because of PPBUS_G3H was high?

 

[2informaticos]

Before connect charger, ALWAYS check diode mode to ground on all big coils.
You should interpret the readings correctly, to see if there is any short between PPBUS_G3H (L7130) and a secondary power supply derived from it.