SOLUTION: iphone 6 plus searching signal weeakly after dropping
When you come across your iphone 6 plus no service suddenly after dropping, you should take it to fix, but sometimes you will find that has not been repaired well. what reason it is? And how to do. This post highlights the most effective solutions and workarounds used to address an issue on the Apple iPhone 6 plus, in which the iPhone shows a No Service or Searching for Network error in the status bar and can't connect to a cellular network. So I will recommend you some solutions to fix.
Issue:
IPhone 6 Plus has no service after dropped, and has not been repaired well for several times. It does not show IMEI when dial *#06#.
Solution:
1. There are several reasons for no service.
First, there is no baseband (no IMEI and modem firmware). Second, iPhone does not read the
SIM card (no ICCID).
Third, there are some problems in RF circuit. If dropped iPhones displays no service, components pseudo soldering or open circuit may cause the problem.
Therefore, we can conclude that no-service trouble takes place in RF circuit. Use
multimeter to measure several main test points, finding out the diode data of testing point PP3170_RF is lager than the normal one 0.406.
2. After checking the schematic diagram, testing point PP3170_RF is the clock signal RFFE1_CLK of RFFE bus input by
baseband CPU.
3. Checking the
PCB circuit diagram bitmap and we can see RFFE1_CLK’s signal is sent to many chips.
4. Removing these chips, we find many solder pads of these chips have dropped off from
motherboard. Use repairing
jump wire to connect these pins of dropped solder pads.
Then paint
green UV Solder Resist and reweld those chips. Measure the diode data of testing point PP3170_RF and now the data becomes normal. Assemble motherboard to assembly and power on to enter the system. IPhone displays IMEI normally when dial*#06#.
5. Screen top left corner shows China Unicom 4G network signal after inserting SIM card. Dialing 10010 to test, the conversation is normal. Trouble is removed.
So you can try vipprogrammer.com to get some iphone repair tools when you want to DIY your iphone 6 plus.
Posted by: fixphone at
4pm
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