U2 ic replacement issue
i replaced the u2 ic on iphone 5s and i get red/blue screen and sometimes the screen goes like those old TV with white screen and full of black dots
Is this a good question?
The U2 replacement probably needs to be done again.
Here a couple of things to look out for when doing micro BGA replacements. You may have already applied all or most of these best practices but just in case...:
Obviously, too much heat can cause damage not only to the IC you are replacing but also the surrounding area and the flip side of the logic board. Sometimes passives get disconnected electrically even though they look okay. Those that are encapsulated in underfill are more prone to that.
Also, when testing for "float", we can sometimes nudge the IC too far and cause a solder bridge underneath the IC, shorting out pins that can cause all kinds of problems.
So in essence, I would remove Tristar and start again with a new one.
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