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lifehack (does not apply in the US): if you need BGA rework done and you're not skilled enough for it--say, really fine pitch component, damaged pads, etc--find a place nearby that repairs smartphones *unauthorized* (this is important) and ask them to do the work. /
I once had a chip in 96 ball MicroStar Jr package, and the component dense board used via-in-pad. I removed the IC and then accidentally tore off a critical pad. I went to such a shop, described the problem and the correct chip placement. I asked them to reball and solder it. /
one hour later, I got the board back, and it booted fine, meaning the pad got connected! the worker who did the job told me he "pressed on top of it while reflowing to get the ball to contact the via". I think I paid $20 for that repair
you might have to bounce across a few shops because they miss the required BGA stencil, or because they think this is too weird; the phrase "I'll pay you however much cash you think this job is worth whether the board works or not" goes a long way fixing the latter problem
also the people who refuse the job often know someone else who will happily take it
what's the part that doesn't apply in the US? existence of unauthorized smartphone repair shops?
basically yeah
I randomly found and followed “electronicsrepairschool” on Twitch, and the level of microscopic craftsmanship employed at one random British phone repair shop completely reset my understanding of what’s possible
these people are absolute magicians
I remember I reflowed the 7950 gtx GPU for my laptop in my oven about every six months when I was in school. Took about 3 hours to do vs. the 6 weeks it took a local shop.
Bondwires or bad solderballs, we probably will never know
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