How to Repair a G5 Quad Dual Pump LCS

[360alaska]

Neat, yeah, it could also be bad cpu's that's why I suggest a load test with a head gun on low.

 

[mePy2]

Thank you

 

[mePy2]

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]

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]

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]

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]

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]

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]

I didn't say they had no use, I said it helps assembly when attaching the waterblock to the CPU.

Yeah, sure... but I expected something more "important"...

I’m going to replace them anyway though.

 

[mePy2]

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?

 

[mePy2]

@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]

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

 

[mePy2]

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



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

 

[mePy2]

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...