The laptop turns on but nothing on the screen. I checked every part of the motherboard and everything is fine except NVVDD is not turning on, no voltage after G_PWR_SRC_NVVDD mosfets, they are not turning on. I borrowed two same working motherboards and cheched resistence on all the DGPU nets and only difference i found was on FBVVDQ...On working motherboards the resistence is arround 90 ohm, and on not working its arround 38 ohm...but the funny thing is that on FBVVDQ net the voltage is present.
So...questions...the lower resistence on FBVVDQ net indicates that one or more gpu memory moduls are bad? if so, how to determine which one?
And why NVVDD is not turning on? is it because FBVVDQ is bad? I couldnt find anywhere what is the power on sequence order...which is first? fbvvdq or nvvdd? and are they depending on each other to turn on?
Help please
Boardview attached.
So...questions...the lower resistence on FBVVDQ net indicates that one or more gpu memory moduls are bad? if so, how to determine which one?
And why NVVDD is not turning on? is it because FBVVDQ is bad? I couldnt find anywhere what is the power on sequence order...which is first? fbvvdq or nvvdd? and are they depending on each other to turn on?
Help please
Boardview attached.
Comment