iPhone 11 Pro signal is not good fault repair

Machine model: iPhone 11 Pro
Fault: The cell phone signal is not good.

iPhone 11 Pro signal is not good fault repair Figure 1.

Maintenance process: After receiving the mobile phone, the inspection found that there was no signal when the card was inserted as described by the customer.IMEI can be displayed on the dialing interface *#06#, indicating that the RFFE bus is normal.

iPhone 11 Pro signal is not good fault repair Figure 2.

It can also be found in the operator option, indicating that the signal receiving part is normal.

iPhone 11 Pro signal is not good fault repair Figure 3.

Then the problem is probably judged to be that in the launching part, the main board is removed by disassembling the machine, and the main board separate is put on the heating table.

iPhone 11 Pro signal is not good fault repair Figure 4.

After testing Diode value is normal,SMD REWORK STATION removed RF IC considering the problem of chip body.

iPhone 11 Pro signal is not good fault repair Figure 5.

Handle PAD properly, replace it with a good RF IC and put it back.

iPhone 11 Pro signal is not good fault repair Figure 6.

Next, we put the motherboard welding.

iPhone 11 Pro signal is not good fault repair Figure 7.

welding has been installed properly, the card insertion signal has returned to normal, the call is normal, and the maintenance is over. The fault is that the card has no signal due to the damage of RF IC.