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iPhone, iPad, iPod Hardware Repair Hardware Repair discussions for iPhone, iPod , iPad & Apple Products, help, guides. |
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06-13-2017, 21:27 | #1 (permalink) |
Insane Poster Join Date: Oct 2005
Posts: 64
Member: 193584 Status: Offline Thanks Meter: 8 | iPhone 7 Touch screen, weird problem! Connector is looking good and in diode mode on multimeter all pins on connector J4502 and J3801 have correct values. Checked FL3904 and its ok. I have noticed that when home button is connected, there is no PP1V8_TOUCH. One more thing. When home button is disconnected, iPhone does not enable assistive touch so I cannot activate iPhone and therefore can't be used. Does anyone knows what could be wrong? Please help. Thanks |
03-13-2018, 08:54 | #4 (permalink) |
Registered User Join Date: Sep 2016
Posts: 30
Member: 2625122 Status: Offline Thanks Meter: 23 | i have same problem with iPhone 7 touch not working, i tried two screens but same problem, i checked J4502 and found that all pins have correct values except pin 18 have 250 resistance which should be around 490 this line for ( SPI_AP_TO_TOUCH_MOSI_CONN ) coming directly from the CPU to FL3904 which replaced but still same value and touch still not working, please need you guidance to fix this problem .Thanks |
03-14-2018, 17:41 | #6 (permalink) | |
Registered User Join Date: Sep 2016
Posts: 30
Member: 2625122 Status: Offline Thanks Meter: 23 | Quote:
i connected LCD and home, switched phone on and keep measured both side of FL3910 while phone booting the PP1V8_TOUCH is missing .what is that meaning .the resistance value of pin 9 while phone off with no battery is 530 with connected LCD and home . I'm confusing what is going on phone was working fine but no speaker i opend it and cliked dock flex and speaker works but touch stopped working . i discunnctd the dock flex and changed LCD and tried with other phone housing but no luck. Please help. | |
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