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2014년 9월 19일에 출시된 이 4.7” 스크린 iPhone은 iPhone 6 Plus의 작은 버전입니다. 모델 번호 A1549, A1586 및 A1589로 식별됩니다.

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Need some soldering advice for beginners

Hey all

So i’ve recently started messing around with microsoldering. I’ve mostly been practicing on dead or iCloud devices. I’m having a few big issues.

1) Is there any good way to easily remove under-fill?

2 My solder just sticks to the board in a big clump. Not to it’s respective pads, just in a big ball. I can wick it away but it just happens again when I try and reball / clean the pads. I’m using plenty of flux so I don’t see that as being the problem but then again I know absolutely nothing about this.

And finally does the orientation of FPC connectors matter? I don’t think it would but like I said I know nothing. Any and all help would be appreciated. Even if it has nothing to do with these specific questions anything is helpful. At this point I break everything I touch hahaha. Thank you all :)

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Awesome. Any idea what I'm doing wrong?

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Here are a few observations…

  • Underfill is the bane of micro-soldering iDevices. Everyone develops their own method so you’ll have to experiment but consider that most underfill softens up at about 125-150C. That is lower than the melting point of leaded solder (and also non-lead solder) so the trick is to get the are of the board to that temperature without going over the melting point of the solder. That way you can scrape away the visible underfill before removing the IC. For the cleanup underneath the IC, the same temperature guidelines apply. Look at videos from multiple techs online to see a good variety of techniques (and tools) and experiment. You’ll note some folks use hot air, others use a pre-heater or combine the two.
  • If your solder is just clumping to the board, that means the board isn’t at the right temperature…it needs to be hotter. This is kind of like freezing rain (but sorta different ;-), the water freezes immediately on a cold surface. This will usually happen on pads or areas under an IC that are a large ground plane. They require more heat than little-bitty pads that are essentially connected to nothing more than a tiny trace or via.
  • FPC are not orientation sensitive.

It’s good that you are experimenting with iCloud boards. Try various temperatures and nozzles (for hot air) and tips for your soldering iron. In the end, it’s all about heat transfer. Once you get the area under work at the proper temperature (and no more), you’re technique will improve dramatically. The flip side is to avoid getting too much heat otherwise you will cause lots of collateral damage.

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Thank you so much! I usually have my hot air set at ~380C, and the iron at around 450. I'll increase temps a bit and experiment around with that. Thanks again :)

Different equipment will yield different results but your iron at 450C seems high to me for such thin boards as iPhone boards. Working on big computer motherboards requires more oomph but not iPhone logic boards. Your hot air temp is good, most folks work at 360-380. You will want to dial it down when working solely on underfill.

Sounds good. I'm waiting on some more test devices as i've completely ruined all of my boards. I'll give it a shot when I get em in. Thank you :)

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