Interesting, first, you ment like this right?
and i would test like this on all four top SIC780's?
http://image.prntscr.com/image/8f98b1ca72fc410ea12957c6f3deee41.png
yes, but remember this is view from the bottom = mirrored
EDIT: If so, Most gives 3.3 or 3.0 measured with 20k on my multimeter. Some configurations gave 0.00 but so did all the others in the same configurations.
there is only one configuration, pins are either PGND or VIN, see attachment
3 ohm between Vin and ground is BAD, Kohms sounds better - this would keep raising as the caps are being charged
There should be around ~1 ohm between SW and ground, this is GPU resistance thru the coil. I dont know the exact resistance of 780TI chip, and am too lazy to power down my own computer to check
, but the GTX260 that just happens to sit next to me is 0.8 ohm, while GTS450 is 2 ohm, so expect something low, but not zero. GTX 1080 is <0.1 ohm so requires very good multimeter (perhaps even bench meter and 4 wire setup).
Now the 4901NF confuses me a bit aswell. the two 4901NF's do act different in mesurements as showed futher up.
thats because top one is supplied from PCIE, and the bottom one from external connector, different cap configurations etc. Your measurements make no sense without units, there is no way they are all in ohms + Armadillo made you measure supply rails, not the output ;-). Output of 4901NF is on the bottom, you have to measure directly on the coil, or on that small black capacitor on its left (while looking at the card like in
https://3dnews.ru/assets/external/illustrations/2014/03/27/814253/11_pal78ti_pcb_big.jpg )
http://www.onsemi.com/pub/Collateral/NTMFD4901NF-D.PDFhttp://imageshack.com/i/plLbI9fKjhttp://imageshack.com/i/poZSBIA8jare same picture different subtitle ;-)
Lets start from the top. measure 3 fuses, the yellow/brown elements marked R or X, L16 L17 L18 I think, and R51 R52 R53 power monitoring resistors. While you are at it measure all the coils (grey cubes).
Then stick black probe on the metal bracket of the card or blue GND on my attachment and measure SIC780 Vin and SW with red probe in resistance mode. Pay attention to the units (ohms or Kohms), and if the reading is immediately stable or rising.
btw you dont have to plug those small x2 power connectors, at least not in the connector closer to the gpu, photos on the net show most Palit 780s dont even have full 8x4 socket there.
https://www.ekwb.com/configurator/upload/pictures/Palit-GeForce-GTX-780-Ti-JetStream-3GB-GDDR5-(NE5X78TH10FBJ)-PCB_54863.jpgedit: older cards I have on hand all detected external plug by checking middle ground pin
Just for reference GTX 260 will print same message with no external power and will start with full tilt fans and black screen/no boot when it fails to detect both power connectors. I used to run it with only one plugged + paperclip shorting middle ground to its neighbor in the empty external power socket because my power supply had only one 6x2 plug. I do not recommend that
very prone to frying whole computer by accident
Your card doesnt seem to use same detection method and instead measures power drawn from external sockets.
Either one of the mosfets in the middle is shorting supply,or one rail went completely open, or its a fried driver, or fuse, or power resistor, lots of stuff might of went bad. But getting the message with no external power means GPU and RAM are fine and card is fixable.