Get the iphone 6 plus from our VIP customer. According to the customer describes:
1 No Display frequencies.
2 Cant hear clearly when got through with others ,and with bit noise.
3 Can receive the call while touched no reply.
We judge that the screw of the iphone flex cable iron got wrong.And generally speaking, most of the no display, black screen is caused by faulty hardware or damage to some circuit components.
The description are shown in pic 5-3-1
5-3-1
Step1 Repair an iphone 6plus issue which no display, we connected with the adjustable power supply to trigger the current is normal. Disassemble the iphone, we are going to measure the value of display pin but find no abnormalities.
Step2 we found that the iPhone 6plus motherboard has been removed two screws before we disassemble it.So we removed the third screws ,then each column has twisted traces, we got all of them scraped ,we found no signs of disconnection.
Step3 We knew the normal power supply value is 1.8 V after we tested it, neither +5.7V and -5.7V have no voltage output, +-5.7 are output by the iPhone display power IC, first remove the display IC and hit each pin to the ground, we find D3 foot 12C0 bus disconnection.
Step4 we find the D3 pin is connected with the pull resistor on the side of R0302, by observation on the iPhone bitmap, so directly welding jumper wire from the resistance flying line to the display power D3 pin, and the resistance is measured as normal.
Step5 The iPhone can show normally after we install the display power.of course, we should have a power test firstly. But the touch still can’t be used , so we re-install the black touch. As shown in picture 5-3-2 and 5-3-3
5-3-2
5-3-3
After we finished the installed ,touch function is fixed successfully which same with the post display. But we have to stop the testing because we have no password, so our phone maintenance is ended here. Thank you!
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