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Tips: there is no display after iPhone 6 is powered on

Recently, we got the iPhone 6 from our customer, because the iPhone 6 has no display after it is powered on, the trouble is that the screw column is twisted through.  Now, we have some tips for repair it.

Tips

After openning device, we find BS2503 screw has already been disassembled. Blow off, the BS2502 screw has traces of being damaged. As shown in picture 1 and 2.


We find 14 base AP_TO_LCM_RESET_CONN_L shows infinite data when measuring the reststance of J2019 base. As shown in picture 3.


CPU reset signal on the screen is to go under the BS2502 screw column, scraping the screw column to measure, we find it's broken on the edge, which and can only be solved by jumper wire. As shown in picture 4.


After soldering the jumper wire and install screen to test, we can see backlight but no display, the measurement shows no voltage on the both positive and negative 5.7V of the display. Here we move into the measurement when it is power off , the C1554 capacitor 1 base shows infinity, this foot is leading to the U1501 display chip C4 base. As shown in picture 5.



Then we disassemble display chip U1501, the C4 base solder pad was broken, so we solder the jumper wire and install chip on it. As shown in picture 6.




Install the iPhone device and turn on it, it can display normally, finally we succeed in solving the fault on iPhone 6.

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