Fenomeno di malfunzionamento
iPhone 7 nessun servizio
But the IMEI and modern firmware information was normal in the general information list and also when dialing *#06#.
Risoluzione dei problemi
According to the malfunction phenomenon, we can conclude that the Baseband part was normal, the problem was from the Radio Frequency (RF) circuit.
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Take out the motherboard and checked the RF chips, there are two RF chips on the motherboard, XCVR1_RF, and XCVR0_RF.
The outlook looked good. The voltage for the chips is also normal
so we can try to replace XCVR1_RF and XCVR0_RF one by one.
After replacing XCVR1_RF, assemble the phone and test, the service back to normal, problem resolved.
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