PREMIUM iPhone Signal issue case study

intoy

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iPhone 8 dead due to busted caps

Water damage busted ang PP3V0_NAND kaya pag lagay ng power supply papalo to the max then mag babagsak
may prior repair na hula hula ang ginagawa dahil ang cpu na daw ang sira
ginalaw ang DSM_HB_E kaya pinalitan ko
Working na ang lahat upon testing pero walang signal
Present ang imei sa unit at present din ang Modem Firmware
sa 3UTools ganun din din

Behavior:
walang *#06#
No Service ang makikita
sa Cellular may mag appear and disappear

2023_06_27_17_05_IMG_9295.PNG


Behavior 2
Mag appear ang Hotspot then mag disappear din
2023_06_27_17_09_IMG_9296.PNG


Hardware Solution
upon checking this rail PP_0V8_SMPS1_E diode resistance is just 0.041 only
posting3.png
 
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iPhone8 on PSU .0 to 0.2 back and forth after power switch on
reball the NAND ic solve the issue but error91 on retain flashing

1688037754683.png

1688047143859.png

1688048091218.png
 
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