Hello,
2sd high side mosfet was shorted, and replaced. ok.
Now, all is good (I have another exactly same MB working for compare), except a low voltage drop on mosfet of buck converter, close the ram. 0,150v instead 0,450v for working MB.
I removed this mosfet, and no change, the 0,150v stay on the coil pad (ram side).
In following direction of 19v power rail : voltages drops are fines. But in ram direction, at all caps around ram modules, I measuring (of course) the same voltage drop than the coil.
I guess the internal power line of ram modules could be bad ? Do you see another explanation pls ? How to check ?
If I temove the two other mosfet close the coil, ram should be fully isolate from power lines ? And if voltage drop is the same, that means the ram internal power lines are broken ?
I worked only without power, maybe the MB works. But I'm scared to try wuth this issue.
2sd high side mosfet was shorted, and replaced. ok.
Now, all is good (I have another exactly same MB working for compare), except a low voltage drop on mosfet of buck converter, close the ram. 0,150v instead 0,450v for working MB.
I removed this mosfet, and no change, the 0,150v stay on the coil pad (ram side).
In following direction of 19v power rail : voltages drops are fines. But in ram direction, at all caps around ram modules, I measuring (of course) the same voltage drop than the coil.
I guess the internal power line of ram modules could be bad ? Do you see another explanation pls ? How to check ?
If I temove the two other mosfet close the coil, ram should be fully isolate from power lines ? And if voltage drop is the same, that means the ram internal power lines are broken ?
I worked only without power, maybe the MB works. But I'm scared to try wuth this issue.
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