I've got a bit of a private project that I'm looking to undertake and was looking for some supplier advice.
I'm repairing a Nokia Lumia 800 and am chasing a BGA stencil to reball the chip.
I've found one on aliexpress.com, however I have some concerns about the quality of the stencil due to it's very cheap price. Not always a bad thing I know but I suspect if the points don't line up to the nanometer then I'm going to have no joy.
Does anyone know of a good supplier for these stencils or have any experience with the cheap ones and their accuracy?
A nanometer is very, very small unit of measure.
Re-balling involves more likely tens of millimeter precision.
The stencil should be the least of the issues, the problem usually is the high tech, high precision positioning and soldering system 😯 , example wink
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jaclaz
Yeah I've been watching a few of those videos and while that method appears fairly straight forward it's the next step that has me worried, lining up the reballed chip with the PCB and getting it in the perfect position before applying heat to re-apply the chip.
I have a suspicion it's not going to work but I'm having fun trying )
Yeah I've been watching a few of those videos and while that method appears fairly straight forward it's the next step that has me worried, lining up the reballed chip with the PCB and getting it in the perfect position before applying heat to re-apply the chip.
I have a suspicion it's not going to work but I'm having fun trying )
Even then you do not need to be extremely precise (of course you have to center the IC properly) as the heat itself (the tension in the solder) will automatically align the chip to the pads
Consequently they are easier to solder, no legs to get damaged and
they have a huge self centering effect due to the high solder surface
tension effects caused by the array of solder balls.
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The tricky part (with poor man's tools or however not dedicated equipment) should be finding (and providing) the right temperature and amount of heat, without overheating the component but still allowing a proper soldering.
jaclaz