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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone 6 / iPhone 6 Plus / iPhone 6S / iPhone 6S Plus

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Old 01-22-2020, 03:47   #1 (permalink)
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Join Date: Jan 2020
Location: Poland
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iPhone 6S no image - MIPI_AP_TO_LCM

Hi i have iPhone 6S (820-5507-A) - no image/no backlight
iTunes see the phone, but i dont have sound when plug cable.

First i check FL4211 - is damage and replace them, still no backlight.

Next check pin 33 J4200 (AP_TO_LCM_RESET_CONN_L) it's shorted to CPU
remove R4220 FL4221 C4221
Short still is
I make alternative signal 1.8V from LCM_REXT to pin 33

LCD connect (only j4200) and when im boot (start from 85mA) i have 1.8V in pin 33
After boot im wait some time - Pin 33 has no voltage, when press power button to wake up - 1.8V is it.

U4000 is good i swap them from other working motherboard.
Have all voltage

Remove U4020 and check J4200 diode mode and have question about MIPI_AP_TO_LCM

Remove L4200 an check diode mode from side CPU then i have about ~0,540 and slowly up to ~ 0,760 (first checking, after don't must wait i have ~0,760)
It's te same every six signal

I check J3100 all MIPI_FCAM_TO_AP signal and too ~ 0,760

I check J3200 all MIPI_RCAM_TO_AP signal and too ~ 0,760

Definetly CPU is damaged ?
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