Posted on July 11, 2019
iPhone 7 No Service Solution BB_CPU WAYS
Infamous “no service” issue with the 7 series iPhone usually caused by a shorted line inside the bb cpu at “PP_1V0_SMPS5”. If it’s not completely shorted (0 ohms) you can place a 2.2k. resistor in series with the circuit on C5627_RF which is PP_1V2_LDO2 1.2v and can be delivered to C5701_RF PP_1V0_SMPS5 which holds it steady at 1v and prevents the bb pmic from going into shut down mode.