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Hello,
I have a iphone 6 plus that had a touch ic disease so replaced the chip and made the M1 jumper. The phone works fine now except it has no cellular reception but wifi works great though. Any ideas on where to look for the problem? It worked fine prior to the repair.
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Check the antenna interconnect wire on the back of the board and insure that the board was properly mounted in the housing. If all of that is okay, then you may have applied too much heat to the board and caused issues in the RF section, which is the bottom, front and back, of the logic board. Look for solder bridges, measure the BBPMU voltages etc.
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