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HELP! iPhone 6S home button unresponsive--screen wakeup delay

Yesterday, we received an iPhone 6S, which problem is the iPhone home button often gets unresponsive, and it will automatically change to recovery mode.  Now, we need to fix it.

Disassemble the iPhone, and take out the motherboard, we found that  the CPU and WiFi has been repaired,  32.768, 24M, iPhone NAND flash were also replaced. 

Measure the iPhone motherboard with multimeter, power-on current is normal, then install the assembly to test, all of functions are normal, so we put aside to charge. An hour later, we find that home button has no response by pressing several times. The iPhone device could be lighted by pressing the screen-lock button, but home buttion is responsive after screen is locked, so the fault was judged as wake-up delay.

Measure BURRON_MENU_KEY_CONN_L, the home button voltage is about 1.3V as normal valure, considering the peer has changed the iPhone WiFi, clock, CPU, so the fault is locked in the fingerprint button scale. The original picture is shown in picture 1.



According to observe on the picture, we get to know the board is without print, we doubt the iPhone 6S CPU has been doing the real-time test to whole device hardwares after booting, this motherboard has no original fingerprint key. Fingerprint key does not match, so it's suspicious that the CPU has been repeatedly verify if the fingerprint key is matched, which leads to wake-up delay, standby sleep phenomenon.

Next, we're going to disconnect the fingerprint so that it doesn't work. As shown in picture 9-8-3. After disconnection, the phenomenon of delayed wake-up disappears. We test again before shipping it back to customer, it cannot be turned on now, measure the current with 70 Ma, connect it to the computer, which displays recovery mode, but does not display the model. As shown in picture 2.


It cannot identify the model, we find the resistance on phone circuit diagram and measure whether the pull-up voltage is normal, the result is only 1.65V. 

Remove a 240 ohm resistor from the scrap motherboard to change the pull up voltage. 


Finally, we replace the 240 ohm resistor, and then we power on iPhone,  it boot smoothly now. The iPhone can back to work.

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