iPhone 14 Pro Stuck in DFU: Tracking Down a Hidden NAND Fault скачать в хорошем качестве

iPhone 14 Pro Stuck in DFU: Tracking Down a Hidden NAND Fault

In today’s video, we tackle an interesting data recovery case: an iPhone 14 Pro stuck in DFU mode. This device came to us from another repair shop. After an attempt to fix a cellular reception issue by splitting the sandwiched logic boards, the top board completely died and refused to boot past DFU. Follow along as we walk through the diagnostic process to find the true culprit and save the customer's data! 🔬 What we cover in this repair: The Initial Triage: Verifying the DFU state in 3uTools. Because the exact device model was correctly identified, we immediately ruled out missing or damaged Board ID resistors. Power Rail Diagnostics: Booting the top board via PSU and using an oscilloscope to verify the NAND power lines (PP1V24_S0, PP0V83_NAND_S0, and PP2V625_NAND_S0). All power lines were clean and stable. Finding the Fault: Moving to the PCIe communication lines (TX-, TX+, RX-, RX+). By measuring diode mode values at the series capacitors, we found healthy readings on the CPU side, but a dead Open Loop (OL) on the NAND side. The Fix: A physical disconnect! We removed the NAND chip, cleaned the pads, reballed it, and dropped it back onto the board for a successful boot and full data recovery. Don't forget to like, subscribe, and leave a comment if you want to see more board-level diagnostics and micro-soldering repairs! #iPhone14Pro #Microsoldering #DataRecovery #DFUMode #LogicBoardRepair #NANDReball #TechRepair