Fault description: iPhone 6S volume up button out of control
 
According to our ever fix experience, we doubt there exist some control IC fault, it needs to disassemble the screen, let us start it.
 
Put iPhone 6S on the WL Aluminum Alloy Pad, and then use phone opening tools to disassemble the iPhone, take out the iPhone motherboard.
 
Measure the resistance of J4700_3# with Fluke 15B+ Digital Multimeter, it is normal. Put iPhone motherboard under the 3.5X-90X Stereo Zoom Microscope to check, we found the iPhone power IC was replaced by other phone repair man. Measure its voltage, it only has 0.5V, and the voltage of BUTTON_VOL_UP_CONN_L volume up button signal is pulled down. 
 

16-11-1

 
Based on our repair experience, mostly this failure is caused by damaged iPhone CPU, so replace the iPhone power IC is useless. 
 
BUTTON_VOL_UP_L lower voltage, it has no external pull resistance, it is pulled directly through the CPU internal. Borrow PP3V0_TRISTARUSB controller 3V string the resistance of 1K, so that the voltage is pulled up to 1.6V. 
 
Assemble the iPhone to test; now the iPhone volume up button can be used normally.
 

16-11-2

arrow
arrow
    文章標籤
    iPhone 6S volume up button fault
    全站熱搜

    diyphonetool 發表在 痞客邦 留言(0) 人氣()