NUCromancy - Answering Viewer Questions

[@0llowain968]

I have 4 big capasitors and 2 small ones in the memory VRM that show the same resistance to ground on both sides. I believe one of them failed. So i will start to solder them off one by one to see if the short is gone by some point. Hopefully I don't have to solder them off all. When this works i still have to replace the broken one. How do I find out how big the borken capasitor was? I cant find any data sheets online matching the IC near these capacitors.

[@0llowain968]

Ok, finally i got to it: The Memory VRM coil shows ~1 ohm resistance to ground. When i measured Voltages, all VRMs showed 0 Voltage, while measuring it on the same points you measured the resistance, dont know if thats the right point. I think not, because I got already a good 3.3V output at the powerbutton. I think I have to measure it at the output of the FETS, but I wasnt able to get my hands on a saftey pin yet. Anyways, I guess I have to further troubleshoot the memory VRM now. I randomly checked caps for their resistance, but i cant distinguish if they are resistors or caps. So I have no idea how to proceed from here. Another question: Why did you measure the resistance of the VRM at the coil pads and not somewhere else? Just because they are big and easy to spot or is there something more to it? Again thanks a lot for your help! Its very much appreciated!

[@0llowain968]

Ok, i am pretty confident by now, that there is a short somewhere in the memory VRM. The Caps behind the Memory VRM Coil have the same resistance to ground on both sides (~0 Ohm). In the other VRMs this is different. But how do find out now where exactly the short is? Another thing came to my mind: Why does the whole board not power up, if the memory VRM is rigged? As far as i understand, only the memory is effected by that and the rest of the board should work fine, for example, the Power LED should turn on.

[@0llowain968]

OMG this is so amazing! Cant believe i got a whole video as response! I will try this first thing tomorrow and tell u the results. And you pronounced 0ll0wain perfetly :)

[@AaronAverett]

Right on! Don’t forget to leave the heatsink on when you do the voltage test.

[@0llowain968]

I just soldered off 8 capacitors, found some more that could have caused the short. No improvement. Now I'm totally clueless. Dont know which element causes this short, and I'm even questioning if I'm going in the right direction at all.

[@AaronAverett]

Actually yeah. See here: kzbin.info/www/bejne/nXTMZIxqpZ6KY5I

[@0llowain968]

@@AaronAverett u are just the man