How to solve iPhone 6 Plus Wi-Fi Problems

Are you experiencing iPhone 6 plus Wi-Fi problems? Well, I have the MOST comprehensive guide for you.You can solve from:

Weak signal even thou Wi-Fi is working

Wi-Fi cannot turn ON to

Wi-Fi is showing “unknown” in “about” section and cannot turn ON

This is a simple process.Just follow the steps I am going to highlight in this guide and you will definitely solve all iPhone 6 Plus Wi-Fi problems.Let me take you through how to go about it:

iPhone 6 Plus Wi-Fi problems Example 1:

iPhone 6 Plus Wi-Fi was working but the signal was very weak.

Failure Phenomenon :

iPhone 6 Plus Wifi can switch on but the signal is poor.

There will be no signal at all when you just keep a bit far away from the router.

Maintenance Procedures:

Boot test, there is only 2 hotspots shown on WIFI search and the signal is very poor with 1 or 2 signal mark, while for the fault-free iPhone can search more than 10 hotspots. So we could judge the fault is Wifi signal poor.

We found the wifi chipset has been replaced after phone disassembling. But to confirm the Wifi chipset’s itself working or not, we need to fly an antenna to replace the antenna circuit outer rim around the Wifi chipset. The fly antenna method is to fly a 10cm enameled wireline from C5213_RF nearby one end of the Wifi as an antenna. The position for Wifi fly antenna is shown in Pic 1-1.

How to solve iPhone 6 Plus Wi-Fi Problems

The position for Wifi fly antenna Pic 1-1

Boot test again after flying antenna, it has been able to search many WiFi hotspots. At the same time, the WIFI signal is back to normal. After we fly the fake antenna, Wifi signal is normal, which is mostly because the WiFi signal filter FL_CELL_WIF_RF is damaged. However, in real practice removing the filter will no influence the function, so in maintenance, we almost directly skip the filter by flying line. The position for flying line in the PCB bitmap is shown as Pic 1-2.

How to solve iPhone 6 Plus Wi-Fi Problems

The position for flying line in the PCB bitmap Pic 1-2

The flying line method on the phone is shown in Pic 1-3.

How to solve iPhone 6 Plus Wi-Fi Problems

Flying line skip filter Pic 1-3

Fix the flying line after it is coated with green oil. We test the Wifi after assembling the phone and it works well. The problem solved.

iPhone 6 Plus Wi-Fi problems Example 2:

The iphone6 plus Wifi could not turn on after falling

Failure Phenomenon :

The iphone6 plus Wifi could not turn on after falling and the phone repaired once but the problem still not fixed.

Maintenance Procedures:

After disassembling, it was found that the WiFi chipset was directly attached to the pad by adhesive tape. Tearing off the tape and removing the Wifi chipset, we saw that the Wifi pad off is very serious, about 18 spots off, among them one spot is empty no need to supplement. After cleaning the pad, fill the 17 spots and coating with green oil, which is as shown in Pic 1-27.

How to solve iPhone 6 Plus Wi-Fi Problems

The flying line, fill spots and coating with green oil on WIFI pad Pic 1-27

Install the Wifi chipset after filling up the spots, test Wifi from the system and it works well.The problem solved.


iPhone 6 Plus Wi-Fi problems Example 3:

The iphone6 plus Wifi could not turn on.

Failure Phenomenon:

The iphone6 plus Wifi not working and other function is normal.

Maintenance Procedures:

After the phone disassembling, we found the Wifi chipset disappeared and 6 spots on the pad were removed. So we have to mend the lines and coat with green oil. The method of mending the line and coating green oil is shown in Pic 1-28. Test the Wifi again after reinstalling the wifi chipset. Wifi is normal but the Bluetooth can’t switch on.

How to solve iPhone 6 Plus Wi-Fi Problems

Mending the line and coating green oil on WIFI cloud plate Pic 1-28

To solve the Bluetooth issue, we have to remove the WIFI chipset again then measure the ground impedance values of the pad. It is found that the ground impedance values of pin 10 are OL, which is the Bluetooth turn on signal BT_REG_ON.

BT_REG_ON is coming from the power IC through layer routing to Wifi chipset’s pin 10 then come to the PP3145_RF test point. PP3145_RF is shown in Pic 1-29.

How to solve iPhone 6 Plus Wi-Fi Problems

The position of PP3145_RF test point in bitmap Pic 1-29

After measurement, we found that the ground impedance values of PP3145_RF test point are OL too so we can't fly line from PP3145_RF. Moreover, flying line needs to remove the power chipset and routing from inside of the power chipset, which is a time-consuming solution. We could try the other way by digging the whole on the pad to mend the lines, but not over-digging. Then we could fly the line directly from pin 9 of the wifi chipset and turn on WLAN_REG_ON, in this way, we could use the signal from the WIFI. The flying line method is shown in Pic 1-30.

How to solve iPhone 6 Plus Wi-Fi Problems

The flying line from WLAN_REG_ON to BT_REG_ON Pic 1-30

Finishing the above steps, we could test the WIFI and Bluetooth from the system. If the WIFI and Bluetooth work are working well no mater turn on both them or separately, this problem solved.


iPhone 6 Plus Wi-Fi problems Example 4:

iPhone6 plus Wifi could not turn on and in “About” the Wifi was showing “unknown”

Failure Phenomenon :

The iphone6 plus Wifi not working and in “About” the Wifi showing “unknown”

Maintenance Procedures:

Boot test, it is found that the Wifi cannot switch on, which is shown in Pic 1-31.

How to solve iPhone 6 Plus Wi-Fi Problems

The Wifi not working Pic 1-31

After disassembling, it is found that the wifi chipset has been replaced and there were flown lines under the pad. Considering that the pad fly line might be improperly handled or dissatisfied Wifi working condition, we could directly remove the wifi chipset and measure the ground impedance values of each pin on the pad. Compared with the normal motherboard, the ground impedance values of all pins we get are in the normal range. Then we have to measure the ground impedance values of the PCIE bus on the pad, because if we measure the PCIE bus after we remove the WIfi, then the ground impedance values will be infinitely large.(The position for PCIE bus is shown in Pic 1-32) The circuit breaks between coupling capacitor C0703,C0704,C0705,C0706,C0720,C0721 (As shown in Pic 1-33)

How to solve iPhone 6 Plus Wi-Fi Problems

The position for PCIE bus on the bitmap Pic 1-32

How to solve iPhone 6 Plus Wi-Fi Problems

The position for PCIE bus and Coupling capacitor on the bitmap Pic 1-33

By measurement, it is found that there is an open circuit between coupling capacitor C0704, C0705. From the bitmap, we could see that from the pad to coupling capacitor C0704, C0705 need to go through PP3169_RF, PP3166_RF. As shown in Pic 1-34 and 1-35.

How to solve iPhone 6 Plus Wi-Fi Problems

The position for the PP3169_RF in the bitmap Pic 1-34

How to solve iPhone 6 Plus Wi-Fi Problems

The position for the PP3166_RF in the bitmap Pic 1-35

We could directly fly line from the pad to the test point then coat with the green oil. The method of the fly line is shown in Pic 1-36 and Pic 1-37. Then let us install the WIFI chipset and boot test again. The Wifi address still shows “unknown”

How to solve iPhone 6 Plus Wi-Fi Problems

Fly line of Wifi pad Pic 1-36

How to solve iPhone 6 Plus Wi-Fi Problems

The position for the fly line on the test point Pic 1-37

Now we need to carefully measure the ground impedance values of all the pads, and we found that the rest of the WiFi chip is also broken, which is kind of non-broken state. The position of reset pull-down resistor R0719 in the PCB bitmap is shown as Pic 1-38.

How to solve iPhone 6 Plus Wi-Fi Problems

The position of reset pull-down resistor R0719 in the PCB bitmap Pic 1-38

We could directly fly line from reset resistor, the method of the fly line is shown as Pic 1-39.

How to solve iPhone 6 Plus Wi-Fi Problems

The position of fly line from pad to reset resistor Pic 1-39

Boot test again after fly line and install the wifi chipset. If the Wifi shows the address in “About", this problem solved.


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