Good troubleshooting, I've just begun to work on boards and I've killed my fair share of projects by trying to reflow. Every check the board came out healthy was a relief lmao.

Cover the back contact in between the pin on the socket, i think as you close the socket the ground pin(cpu) contact the back of the data pin because there is no plastic to prevent from contacting as the cpu will be moved to the left

@hamdzuii

8 күн бұрын

yes, that's what I think too.

@DreamsOfTheMind-video

8 күн бұрын

Thats also what I was thinking...

@MainboardMedic

8 күн бұрын

Well the ground pin was removed by me at the end if you finished to watch the Video and the short was gone!

@satria4195

8 күн бұрын

@@MainboardMedic yes but on cpu

Your persistence is an inspiration! Keep up the good work.

Good Job! 🤩

Good video man 🗿

23:20 what is the shine bend wall or soldering under pins ? your magnifier is horrible and unstable, also will help side light to remove reflections and you can move it from diferent angle . side look on those pins wil help and more zoom on shining metal wall between those pins. short is internal in cpu groung pins are together. nice work and conclusions, i didnt know dumy ram short tester exist, thanks for tip what buy next

First, I would to clean the socket with a cover removed with a compressed air (maybe a conductive particle stuck some where). If that did not help, I would try (without memory and cpu installed) to put a needle to the hole of the pin, which causes the short and then to close the lock of the socket. Then, when the short appears, i would try to burn out the short with injecting high current to it. I do not believe the 3&4 ram slots would start to work, but the short could be removed without the need to remove the pin from the cpu. Anyway, great video! Thanks!

@MainboardMedic

8 күн бұрын

The short was resolved at the end! And the power was only 2.5A so i wouldnt be able to burn it out anyway!

9:34 see dirt, it's black in colour in the holes in slots here

When you look at the image of the affected pin before the reflow you can see a metal tab on the right hand. I wonder if it was the tab from the right hand side of the pin you removed that has been pushed over to the far left of that pin socket. When you insert the CPU perhaps the leg pushes that tab into the affected pin. You removed the sides but perhaps not the back. There is another one 3 up and from the pin you removed also that looks wrong. I wonder if the previous owner had a CPU with bent legs that caused this damage. I think you should have another look. Look at the image at timestamp 31.37. Just like for LGA sockets look for anything different. I have an AM4 board with a dismantled socket and all the spots for the pins are the same. It does not have the tabs which to me look to be out of place. The other pin is MB_DATA42 and it might be stopping the two affected ram slots from working.

@MainboardMedic

7 күн бұрын

That might very well be the case, that the privious owner had a damaged CPU! That would explain a lot!

I personally reckon that CPU socket is good, I`d make a guess that the short is on the other side of the CPU (so to speak) then hitting the short and the only place your regestering is on the DDR side, of course the issue is then hiding ing the fog of the CPU, so where that line comes out back out (of the cpu) could be a real mystery, also I will add this is all guess work on my part as heck, I`m a lorry driver and don`t fix motherboards!

yes, no. the ground pin next to the target pin, is connected internally to other ground pins. as the socket lid moves the cpu aary left the pin makes contact with the tiny pit of contact on the right side of the target .. ?? maybe.

You could try temporarily cutting the trace near the socket to see if it makes the fault disappear

@MainboardMedic

8 күн бұрын

I was able to ger rid off the short at the end!

oh, lol, I was supposed to wait for you to remove the pin in the vid. before my last comment.. sorry

Couple things... Is yourr signall path correct. 2nd thing was the cpu latch closed when you tested it without the cpu. 3rd thing have you tested the transisor that feeds that line 4th thing did you look for heat on the back of the board when injecting current.

I notice the copper coming out on the right side of the hole seems to come out further than the rest of the holes. Is it possible that when you close the socket that's causing the short.

i suspect its chipset trace low ohm when loop closed. take chipset heatsink off and thermal check w the pin reconnected.

@poklop252

Күн бұрын

chipset has 15ohm, this is 0,44ohm it is onli probes resistant 😞

Also those bent pins that you didnt want to mess with to much, have you checked what those pins do they might be the cause.

@MainboardMedic

7 күн бұрын

They are also responsible for data lines with the DDR and they did show up as fine on my tester!

My Asus Maximus Vi Extreme has this problem ☠️

Might some kind of fluff

or the chip is compromised.