SM5720 Power IC Samsung S8 Note 8 Charging IC

Every Galaxy S8, S8+, and Note 8 board depends on a dedicated baseband PMIC to keep the modem section powered and synced with the rest of the logic board. The SM5720 is that chip. When it fails, the phone doesn't lose power completely — it loses the ability to talk to the network. You'll see boards that power on, boot into the OS, but show no signal, no IMEI, or a baseband that won't register no matter how many times you reflash it.This is the pattern that separates a baseband PMIC fault from a software issue. Software marna won't fix it. Re-flashing the firmware won't fix it. If the board still shows no service after a clean flash and the modem partition checks out fine, the SM5720 itself is usually the next thing to test on the bench.Symptoms that point to this IC include a dead network issue with normal boot, an IMEI that reads null or invalid, intermittent signal drops that get worse with heat, or a board that was dropped or liquid-damaged and now shows baseband instability. On some boards, a bad SM5720 also causes charging irregularities, since a few of its rails overlap with the charging management circuit — so don't rule it out just because the primary complaint sounds like a charging issue.Replacing it is chip-level work, not a beginner swap. Start by confirming the fault is baseband-related and not a corroded connector or a cracked trace near the IC footprint. Desolder the SM5720 with a hot air rework station set to the correct profile for the board's other nearby components — you don't want to lift a neighboring part while you're at it. Clean the pad thoroughly with flux and solder wick before you go anywhere near reballing; leftover solder under a BGA package is one of the most common reasons a "correct" repair still fails after reflow.Once the pad is clean, align the new SM5720 precisely over its original footprint. Even a slight offset on a BGA-pitch IC like this one will cause a bad joint on one or more balls, and you'll be right back on the bench chasing an intermittent fault instead of a hard one. Reflow evenly, let the board cool naturally, then power it on and check for stable baseband voltage and proper network registration before you close the case.This IC is a common bench item for anyone running a GSM repair shop that handles Samsung motherboard-level work. If your workflow already includes ISP-mode diagnostics or eMMC-level testing on dead boards, keep this stocked alongside your reballing kit and PCB holder — a hang on logo or dead after flash board sometimes turns out to be a baseband power fault once the obvious causes are ruled out.Genuine Samsung Semiconductor part, tested and ready for direct board-level replacement. No firmware pairing or activation required — this is a hardware-only fix.