Electronics > Beginners
Am I using the correct temperature to desolder a chop
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ke1ko:
I have a T862++ BGA rework station. I'm trying to remove a GPU from an xbox 360.
I have set the tray temperature to 180, and the IR lamp to 240.
When i start, the flux i've applied starts to bubble but that's it.
I'm not sure where i'm going wrong. Do i have to raise the temperature higher that 240? I tried 260 but even that was ineffective.
Can anyone point me in the right direction?
janoc:

--- Quote from: ke1ko on July 06, 2019, 02:52:04 pm ---I have a T862++ BGA rework station. I'm trying to remove a GPU from an xbox 360.
I have set the tray temperature to 180, and the IR lamp to 240.
When i start, the flux i've applied starts to bubble but that's it.
I'm not sure where i'm going wrong. Do i have to raise the temperature higher that 240? I tried 260 but even that was ineffective.
Can anyone point me in the right direction?

--- End quote ---

No experience with that rework station but lead-free solder is only starting to melt at around 220 C. You aren't heating the solder balls directly plus that chip is large, so a higher temperature is likely needed - 240 should be enough, though.

What you need to do is to preheat the board first - that means you let the board actually sit with the tray heat on only for some time to bring it to temperature, do not apply top heat right away! Only then apply the heat from the top for a short time to melt the solder and pop the chip off.

Also make sure that the chip isn't glued to the board - some BGAs are! That has to be removed first.

ke1ko:
i've tried heating the bottom of the chip up, using the plate. The temperature of the chip does not seem to go beyond 70 degrees.
Even when i use the main desoldering lamp, still nothing happens.
Could my BGA rework station not be powerful enough?
janoc:

--- Quote from: ke1ko on July 19, 2019, 11:10:21 pm ---i've tried heating the bottom of the chip up, using the plate. The temperature of the chip does not seem to go beyond 70 degrees.
Even when i use the main desoldering lamp, still nothing happens.
Could my BGA rework station not be powerful enough?

--- End quote ---

It is either defective or you are using it wrong. Here is a guy removing a fairly substantial BGA chip with it:


Deus:
The BGA lift in that video is a FAIL !!!
He might have gotten the BGA off, but at least the PCB is knackered and most likely the BGA too.

Look at the blister pointed out by the arrow on the included pic.
I suspect there's even more damage on the pcb but hard to see due low quality.

It's alos not the way to remove them as you can knock off or move components around it.
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