Iphone 7 intel no service problem

Shan 02/13/2019

Hi rewa, i need your suggestion pls. I fixed many audio ic in i7 intel boards but recently 10 phones came back after exactly 1 week of the usage with triange no service. I replaced bb pmu, reballed bb cpu, replaced bottom transceivers but still same. I also noticed there is no bb voltages present at all(i assume this is cos there is problem in baseband circuit thats why voltages are off) pls if you can suggest something as i m lost
Answers

REWA

02/18/2019

Check the Modem firmware version. If blank, re-solder baseband CPU or replace baseband PMU/XCVR0_RF; If there is Modem firmware version, replace XCVR0_RF,XCVR1_RF.
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