No one knows. It could be hours or years.
Testimonial: "Thanks. Now i can actually calculate whether or not i can make a profit fixing these pieces of ****."
How long a standered reflow will last depends on several factors.
1 the condition of the board ( warpage caused by screw and washers )
2 Time vs Temp for the reflow profile ,also not all board respond
the same way to 250+deg c so some board need to be manually
reflowed.
3 replacing the x clamp hardware with screws and washers
will damage the board makeing a solid recovery on
reworks very difficult.
There is hardware that will provide good support for the G.P.U.
and will greatly reduce returns .
goto http://www.allxboxrepair.com/C.C.A..html
edchen11
The P.C. board will have a slight load relative to the corners
This will cause the G.P.U. to be forced in to the board , kinda
like using it as a spring . Now with heat and time the screws will
began to loosen due to the board taking a slight indentation
now solder balls in the center will lift and you have a unrecoverable
3 red 0020 , Very tough to fix , trust me I know.
Rob
edchen111
First everything depends on the board geometries ,specifically under the G.P.U..
when you tighten down the heat sink it's very difficult to get a balanced load
and the X clamp hybrid is a lot of work for little gain in my opinion .
their pad will not produce sufficient load on the G.P.U. and with temps at around 100 c
most materials will soften and lose their resilience. If the board is concave
and showing 0020 it's a door stop. I have removed the glue beads on the C.P.U.
then counter warped the board and reflowed the G.P.U. with 1 out of 3 consoles
making a recoveries. but I'll often just give a full refund even if the consoles is
working because I don't think it's going to last .
Some console have dead dead chips there is a way to check this
but you will need a 100mghz scope. and special probe .
Rob
Hi edchen111
I believe I have been honest and helpful with my comments .
giving more than a "No one knows. It could be hours or years"
type of comment.
Could you please revise my 3 thumbs up
Thanks
Rob
I gave you 4 thumbs up. That means someone else voted your solution down. I have another question. You say that a warped board is almost impossible to fix? I found that baking it in an oven (no insulation) at 175 degrees F for about 8 hours was sufficient to un-warp the board (by removing excess moisture in the chip). So far, i have had no problems. Is this only going to be temporary, or can i go and put it up on ebay? I put the original x-clamps back, but i made a small change: I put a VERY thin (but stiff) metal plate covered with a thermal pad between the x-clamp and the mobo to re-balance load distribution. That way, its not all focused in the middle of the GPU. Should this suffice? Or should i just go with the stock clamps?
Hi edchen11
First some of the large electrolytic caps will suffer due to over pressure inside.
Offset pressure and localized heat is my procedure to straighten boards,
and takes about 10 min .
The xclamp is seriously lacking in it's ability to support and load up
the G.P.U. . So I designed a better clamp and it works as a fix and
preventive maintenance upgrade . To be installed after a reflow or
a G.P.U. forced overheat.
http://www.allxboxrepair.com/C.C.A..html
Rob
edchen111
Go to this link http
www.allxboxrepair.com/C.C.A..html
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Yes, but how do the screws and washers damage the GPU? I understand that you can break solder connections by over tightening, but I measure my washers, and i use the standard 1.8. mm spacing between the heatsink and the mobo. If anything, the regular x-clamps cause more damage by forcing the pressure into one area.
****. i just recieved a shipment of machines, 2 have 1022, 2 have 0020, and 1 had 0003(i know that one is totaled. popcorned gpu. imma use it for practice and for parts) is there any way to fix 0020? i tried a hybrid uniclamp, which operates on similar principles to the x-clamp replacement, except it uses foam shims for even pressure distribution, and thermal pads under both the cpu and gpu provide even pressure over the entire area, not just the corners or the center. Also, the chassis is drilled so that i could clamp the heatsinks directly to the metal chassis itself, preventing movement. After i did all this, my first 0020 worked for about a month then crapped out. Any ideas? i'm perplexed, because it was operational after i loosened the screws, then it rroded again, then i tightened it, and it worked-again. I'm confused.
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