srp
macrumors regular
Re: the 2.5DP I had been saving from melting in a pool of dexcool. This is the fourth and I think final pass with a baking soda solution. I loaded up the CPUs and instant 3 flashing lights when booting.
I now know that this 2.5dp is affected by a BGA failure related to the memory slots/controller that causes this issue despite known good RAM.
I was able to confirm this by preheating the board, and then applying direct, prolonged heat to the VRMs.
After words it booted immediately and seems rock stable, installed an OS and going through all the setup now with no hiccups or instability issues.
Once I get to check the temps I’ll report how well my rebuilt LCS solution is working!
Glad I have a way to get it to reliably POST now, even if I have to coax it a bit.
For anyone looking for advice cleaning these corroded daughter boards and fixing the aftermath of the LCS leaks, I 100% recommend an electric toothbrush and a thick baking soda paste (mixed with distilled water). Pour the paste on the board, ensure it covers the whole board, then let it sit for about 10-15 minutes, come back and do a pass scrubbing in small circles, re-apply the paste and do a pass in long vertical strokes and a third pass in horizontal strokes. Do not use any metal wire brushes or harsh chemicals for cleaning, the electric toothbrush works great for this.
My recommendation after scrubbing is to rinse the board in distilled water and finally rinsing with 99% isopropyl alcohol. Put it in front of a fan to dry and in about 24 hours you should be able to give it a try
As a quick update, after getting 10.4 Server installed, it works for about 5-10 minutes and then hard locks up. I think this could be because of the high thermals, I noticed 75c on the CPU B. (I get 60c max under load on my quad) I will probably grab some Artic MX 40 silver and replace the thermal paste on my CPU and GPU as well, and then just be really careful alighting everything and tightening it down.
I now know that this 2.5dp is affected by a BGA failure related to the memory slots/controller that causes this issue despite known good RAM.
I was able to confirm this by preheating the board, and then applying direct, prolonged heat to the VRMs.
After words it booted immediately and seems rock stable, installed an OS and going through all the setup now with no hiccups or instability issues.
Once I get to check the temps I’ll report how well my rebuilt LCS solution is working!
Glad I have a way to get it to reliably POST now, even if I have to coax it a bit.
For anyone looking for advice cleaning these corroded daughter boards and fixing the aftermath of the LCS leaks, I 100% recommend an electric toothbrush and a thick baking soda paste (mixed with distilled water). Pour the paste on the board, ensure it covers the whole board, then let it sit for about 10-15 minutes, come back and do a pass scrubbing in small circles, re-apply the paste and do a pass in long vertical strokes and a third pass in horizontal strokes. Do not use any metal wire brushes or harsh chemicals for cleaning, the electric toothbrush works great for this.
My recommendation after scrubbing is to rinse the board in distilled water and finally rinsing with 99% isopropyl alcohol. Put it in front of a fan to dry and in about 24 hours you should be able to give it a try
As a quick update, after getting 10.4 Server installed, it works for about 5-10 minutes and then hard locks up. I think this could be because of the high thermals, I noticed 75c on the CPU B. (I get 60c max under load on my quad) I will probably grab some Artic MX 40 silver and replace the thermal paste on my CPU and GPU as well, and then just be really careful alighting everything and tightening it down.
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