To Repair iPhone 6S Plus No Service
“No service”message appeared on the iPhone screen, thus we are not able to operate our mobile phone. In this critical situation, all basic functions could not be realized, including calls or messages. Sometimes, our iPhone 6S Plus will not show any service after the SIM card plug in. How to solve it?
Basic on to our previous experience, if mobile phone shows no service after plugging in SIM card, there are generally two damaged parts as follows.
Part 1. Signal channel part
Part 2. REFF bus
You have to distinguish them when testing cell phone.
Plug SIM card in, we can see the serial number when dial *#06# on dialing interface, as shown in picture, it seems that it is not the problem of the REFF bus, so we can exclude the fault caused by the bus (if the bus caused the fault, it will not show the serial number on the iPhone 6s Plus screen after dialing the *#06#).
From the picture , we can see the operator option on the interface, there seems to be no problem with the receiving section. The problem is in the launch section.
Remove the iPhone 6s Plus logic board and measure by Fluke digital multimeter , we found the resistance value of PP_1V0_LDO9 was only 47, which was supplied to U_WTR_RF RF IC.
Remove the U_WTR_RF RF IC to measure again, the ground resistance value returns to normal.
Replace a new iPhone 6s Plus RF IC , install to have a test.
The signal returned to normal and calling function is normal
We can conclude that this fault is caused by the failure of the U_WTR_RF RF IC.
More skills and method of repairing mobile phone,please research on www.vipfixphone.com
Basic on to our previous experience, if mobile phone shows no service after plugging in SIM card, there are generally two damaged parts as follows.
Part 1. Signal channel part
Part 2. REFF bus
You have to distinguish them when testing cell phone.
Plug SIM card in, we can see the serial number when dial *#06# on dialing interface, as shown in picture, it seems that it is not the problem of the REFF bus, so we can exclude the fault caused by the bus (if the bus caused the fault, it will not show the serial number on the iPhone 6s Plus screen after dialing the *#06#).
From the picture , we can see the operator option on the interface, there seems to be no problem with the receiving section. The problem is in the launch section.
Remove the iPhone 6s Plus logic board and measure by Fluke digital multimeter , we found the resistance value of PP_1V0_LDO9 was only 47, which was supplied to U_WTR_RF RF IC.
Remove the U_WTR_RF RF IC to measure again, the ground resistance value returns to normal.
Replace a new iPhone 6s Plus RF IC , install to have a test.
The signal returned to normal and calling function is normal
We can conclude that this fault is caused by the failure of the U_WTR_RF RF IC.
More skills and method of repairing mobile phone,please research on www.vipfixphone.com
评论
发表评论