iPhone X has no service fault repair

Machine model: iPhone X
Malfunction: The mobile phone has no service.
Maintenance process: it is indeed a phenomenon of no Baseband Version to check the mobile phone after receiving the phone, and the modem firmware in this machine is unrecognizable.

iPhone X has no service fault repair Figure 1.

Dismantle the machine and take down the motherboard.separate detected that Baseband VCC has VCC VCC all the way. Open Xinzhizao Soft software and check that it is Baseband VCC PP_1V2_LD01_E VCC and VCC.

iPhone X has no service fault repair Figure 2.

iPhone mobile phone has no service failure maintenance Figure 3.

It seems that the fault point has been found. This road VCC is mainly for RF IC VCC, so it is likely that RF IC damaged RF.SMD REWORK STATION Remove the holder,VCC iron sheet,RF IC, and measure that diode value of PP_1V2_LD01_E VCC returns to normal.

iPhone X has no service fault repair Figure 4.

Next, install a good RF IC and put it back in the card holder.

iPhone X has no service fault repair figure 5.

After installation, the motherboard is welding.

iPhone X has no service fault repair figure 6.

After installation test,Baseband is restored, the card insertion signal is normal, the call is normal, and the maintenance is over. This fault is no Baseband Version caused by damaged RF IC.