Repair (1st Gen) iPhone SE that won't charge

Initially, perform a visual assessment of the main circuit board.Carefully examine the logic board to ensure it exhibits no physical distortions or signs of water ingress.

• Proceed with reassembling the device and conducting functional tests; secure the logic board and display assembly into their designated positions.
• Establish a connection to the battery and initiate the power sequence; observe that the battery level is indicated as 10% in the upper-right portion of the display.
• Connect the charging cable to the device; a lightning bolt icon should appear on the screen. Following a 10-minute charging period, the battery percentage remains at 10%, signifying a failure within the charging circuitry.

Proceed to step 2.Configure the multimeter to measure direct current voltage and ensure the battery is disconnected beforehand.

• Subsequently, evaluate the battery connector, designated as J2400; a voltage fluctuation between 1 volt and 3.9 volts, followed by a return to 1 volt, signifies the charging voltage is operating within expected parameters.

Proceed to step 3:Detach the charging cable and subsequently remove the display assembly.

• Perform a diode mode test on J2400; a standard reading on Pin 5 is 436, while Pin 2 exhibits an open circuit (OL), deviating from the expected range of approximately 600, indicating a break in the associated circuitry.
• The battery percentage detection signal for the device is transmitted from Pin 2 of J2400 to Pin 3 of Q2301 via flexible cable FL2400, then onward to Pin F2 of U2300 through Pin 1 of Q2301 and resistor R2303.
• During the measurement process, it was observed that flexible cable FL2400 is absent.

Phase Four:Proceed with a diode mode test on the bonding pad, observing standard operational parameters. A reading of OL was obtained on Pin 2, indicating expected behavior. Pin 1 registered a value of 767, also within the acceptable range.

• Based on these observations, the previously identified open circuit is definitively attributed to the absence of the FL2400 component.

Procedure 5:BecauseFL2400functions as a combined inductor, a solution involves bridging its two terminals using Solder Paste.

• Proceed with the removal of the logic board.
• Affix High Temperature Protective Tape to the J2400 connector.
• Deposit a thin layer of low-temperature Solder Paste onto the bonding area ofFL2400.

Utilize a Hot Air Gun, setting the temperature to 240°C and airflow to level 2, to apply heat. Subsequently, join the two pins with the liquefied Solder Paste. Allow a 5-minute cooling period for the logic board before employing PCB Cleaner for cleaning.