No WIFI on iPhone 6! The iPhone 6 has been serviced twice since there are no wifi problems, but it hasn't been repaired. What's going on? We need to fix it .
Disaasemble the iPhone, we can see there are lots of solder flux cover on WiFi, it seems that WiFi has been
replaced several times, a nearby resistor is also lost , the bottom of WIFI is
scraped to copper wire, we can certainly confirm it's not the iPhone 6 WIFI module problem.
Then remove the WIFI and boot device to measure the voltage of WIFI bottom board
pin, we find that 14 pin has no signal voltage, it should be 1.8V. The problem
comes from here. Using a digital multimeter
to measure but no resistance, so we use WUXINJI bitmap to check and find it is directly through CPU, is it the
bottom board wire disconnection? After checking, the
iPhone 6 bottom board wire is really disconnected.
Now
we have to see if there is another way, continue to look at the principle
diagram Apple 6.
This
reset signal has a capacitor and a pull-up resistor. The capacitance is next to
WIFI. There is no resistance in the measurement. This is hopeless, then we look
at the pull-up resistor again, find it is on the back of the iPhone 6 CPU from the bitmap, and it's very
close. Measuring resistance is 446, then directly solder jumper wire, install
WIFI, but the icon is still gray. Then we think the WIFI may be broken.
Immediately replace a new WIFI chip.
Now, install the iPhone to test it. After booting, the Bluetooth can be used now, and the WIFI is shown up!
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