Hi to all, today I come with a new kind of fault for me, this are the best ones because with those I learn a lot about how this cards works.
I attach the resistance and voltages I have and tell you what I have discovered.
All I have is 5 volts and 3.3, this one I think that comes from the PCI connector.
Have no shorts, all the possible fuses are OK and I have 2 chips on the top of the card, U13 that should give me PEX_vdd (GS9216TQ-R) and U15 that shold give me 1.8V (another GS9216TQ-R).
As far as I know, 1.8 comes first (and of corse, the U13 (PEX) enable comes from a AND gate with 1.8 as one of the inputs), so I start looking at U15.
It has a enable that is at cero, because it comes from a AND gate too (U509) with 2 inputs, one is 5V that is correct and the other comes from PS_VMON_PGOOD, i look where it comes from and little chip with 2 mosfet inside, (Q519 and is ok), wich first gate comes from BS_OK, pin number 30 of a NCP45491XMNTWG (chip U503).
Since I dont know too much about that NCP4549, i need a little explanation of what it does so I can learn and know if it is correct or not.
Any help???
I post the schematics that im using, the boardview, the meassurements, and the datasheet of that NCP
Thanks a lot in advance
I attach the resistance and voltages I have and tell you what I have discovered.
All I have is 5 volts and 3.3, this one I think that comes from the PCI connector.
Have no shorts, all the possible fuses are OK and I have 2 chips on the top of the card, U13 that should give me PEX_vdd (GS9216TQ-R) and U15 that shold give me 1.8V (another GS9216TQ-R).
As far as I know, 1.8 comes first (and of corse, the U13 (PEX) enable comes from a AND gate with 1.8 as one of the inputs), so I start looking at U15.
It has a enable that is at cero, because it comes from a AND gate too (U509) with 2 inputs, one is 5V that is correct and the other comes from PS_VMON_PGOOD, i look where it comes from and little chip with 2 mosfet inside, (Q519 and is ok), wich first gate comes from BS_OK, pin number 30 of a NCP45491XMNTWG (chip U503).
Since I dont know too much about that NCP4549, i need a little explanation of what it does so I can learn and know if it is correct or not.
Any help???
I post the schematics that im using, the boardview, the meassurements, and the datasheet of that NCP
Thanks a lot in advance
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