Hello to all, here is the situation....the laptop is turning on, no picture,has no voltage on 3v3 main and 3v3 aon net...i look at the boardview (attached) and found that voltage should come from 12vsus net, but for some reason it is not. First i found that the ec chip 25x40clsnig is not receiving any power, the voltage reading was zero or 0,1 v on aon net.
I was finally able to find area where the power problem is but i dont understand why and which part is responsible...please help
So first picture, this is ec chip and nowhere there is voltage relating ground, on aon net 0.09v.
(Image hosting links dead)
I was searching through the boardview, checking how 3v3 main and aon nets are connected to the rest of the board and on the next picture i found that somewhere here is the problem. That resistor r7124 is not transfering the voltage from +12vsus net on DGPU power main.
I was not sure about that so i borrow exactly the same laptop from my friend and i was right. His readings from his motherboard are ok and shown on the next picture.
(Image hosting links dead)
I am not sure now what is going on. I checked resistence of that resistor (while on board) and it is reading 100k ohm. can anybody look at the boardview and picture please and suggest what to do next.
Thank you all!
I was finally able to find area where the power problem is but i dont understand why and which part is responsible...please help
So first picture, this is ec chip and nowhere there is voltage relating ground, on aon net 0.09v.
(Image hosting links dead)
I was searching through the boardview, checking how 3v3 main and aon nets are connected to the rest of the board and on the next picture i found that somewhere here is the problem. That resistor r7124 is not transfering the voltage from +12vsus net on DGPU power main.
I was not sure about that so i borrow exactly the same laptop from my friend and i was right. His readings from his motherboard are ok and shown on the next picture.
(Image hosting links dead)
I am not sure now what is going on. I checked resistence of that resistor (while on board) and it is reading 100k ohm. can anybody look at the boardview and picture please and suggest what to do next.
Thank you all!
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