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How to Repair a G5 Quad Dual Pump LCS

mePy2

Member
Hello there! I’m finally approaching to the fixing of my G5. I noticed I missed the orings... would you tell me what’s their scope and if they are truly needed?

 

360alaska

Well-known member
For a dual LCS, the don't do any sealing or anything, they just hold the water-block in place to make assembly easier.

 

mePy2

Member
Mhm... yeah... are you sure about it? And then, why putting them at all?

(I found they are useless too. I mean, I cannot see their functionality)

Another thing, when putting the screws with the springs (the one that attach the CPU PCB to that metal plate behind the copper liquid thing) should I tighten them until the screws stop? 

 

BadGoldEagle

Well-known member
I think they're there to add a little more pressure onto the block but they serve no other function. As for the screws, you can go ahead and tighten them by hand (with a screwdriver of course). Don't over do/torque them though! It's not necessary as it doesn't support that much weight and you might strip them or worse damage the CPU! I tighten them in a crisscross manner to insure a good pressure repartition on the die. 

I too attempted this repair. But unfortunately in my case it was a failure. I think my heat exchanger is clogged or something because I'm not seeing a lot of flow and it sometimes leaks when I turn the unit upside down. I haven't lost hope though. Next time i'll try to run it with some sort of temporary reservoir (i.e. a bucket). 

 

mePy2

Member
Thank you @BadGoldEagle

Anyway I saw the screws have a "limit” (you cannot tighten them in infinite) and that’s the reason why I asked. I’m thinking maybe they were not tighten enough.

About the o-rings... yeah but the pressure is between the copper and the little aluminum plate. Which is "unusual”? Strange anyway. But I’m thinking LOL if they were put there for assembly only.

 

360alaska

Well-known member
Mhm... yeah... are you sure about it? And then, why putting them at all?

(I found they are useless too. I mean, I cannot see their functionality)

Another thing, when putting the screws with the springs (the one that attach the CPU PCB to that metal plate behind the copper liquid thing) should I tighten them until the screws stop? 
I didn't say they had no use, I said it helps assembly when attaching the waterblock to the CPU.

 

mePy2

Member
Guys, another thing... what can I do for these?

Ps:

do you suggest me to change the thermal compound on the North Bridge too? How can I check its temperature?

image.jpg

 

mePy2

Member
@kby You wrote about testing the LCS connecting it directly to its wire. What about those holes in the CPUs PCBs? I mean they are always power related... I do not want to make something wrong. Thanks

 

mePy2

Member
Just sent the same post two times... apparently I cannot delete it...

Since I am here... would someone explain me “what I have done” in the picture above? It was not me, but the old owner. I do not like it though. I am worried since it is the CPU PCB itself.

Guys, another thing... what can I do for these?

Ps:

do you suggest me to change the thermal compound on the North Bridge too? How can I check its temperature?

View attachment 30127
 
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mePy2

Member
Hi everyone, what is this blueish-green thing on the copper? (Oxidation?)

image.jpg

Also, what can I use to remove the  glue? And what kind of glue it is?

 

mePy2

Member
Hello again... I wrote a long post until the page refreshed. I’m very frustrated now...
Anyway I made the disassembling.
What I have now is this:
• the liquid was like water, no color at all...
• there was little liquid inside
• no @BadGoldEagle orange little balls
• what kind of hoses they are? Seems very strong and made with two materials. The inside is something like plastic, and outside rubber.
• What kind of glue it is? I need the same glue.

That’s all... :)

 
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