SM5705R Charging IC

Every Samsung Galaxy A and J series board built around the SM5705 platform depends on one small component to manage its entire power path — the SM5705R. This isn't just a charging IC in the basic sense; it works as a Sub PMIC, meaning it supervises voltage regulation, charging current, and power sequencing between the battery, the charging port, and the rest of the motherboard. When you get a board on your bench showing charging issue, no charging light, or dead after flash symptoms, this IC sits high on your diagnostic list before you jump to battery connector or tristar checks.You'll usually land on the SM5705R after ruling out the obvious. A phone that charges intermittently, shows a charging icon but doesn't actually gain percentage, or drops dead the moment you disconnect the charger — these are classic power supervisor fault patterns. Since the IC handles regulation for multiple rails at once, a damaged unit can also cause secondary symptoms like random restarts or a board that boots only on charger power. Before you commit to an IC change, always confirm continuity and voltage readings at the IC pads with your multimeter, since a cracked pad or a lifted trace can mimic the same fault.Installation calls for a controlled hot air rework setup and a steady hand — this is a fine-pitch WLCSP package, so pad alignment matters more than heat. Clean the pad area thoroughly, apply flux, and reball if your existing IC or replacement doesn't already carry solder balls. Use a stencil sized for this package where possible; free-hand reballing works but increases your risk of bridging on a pitch this tight. After placement, always verify continuity across the surrounding rails before you close up the board and power it on — a bridged pin here can take out adjacent power lines instead of just leaving you with a repeat charging fault.On the software side, this IC doesn't need firmware flashing, but a board that's had a bad SM5705R sitting on it for a while can sometimes carry corrupted charging parameters. If the phone still shows charging issue after a clean IC swap and verified continuity, run a full flash before you reopen the board — this rules out a software marna fix before you go back to the hardware.Buy this component when your diagnosis points specifically to the charging/power supervisor circuit, not as a blanket fix for every charging complaint. Battery health, charging port damage, and tristar/USB IC faults produce similar symptoms and are worth eliminating first with proper multimeter checks. Once you've isolated the fault to this IC — through voltage testing, thermal imaging, or process of elimination — this component restores the board's charging function without touching unrelated circuits.KB GSM Store stocks the SM5705R for technicians who need dependable stock for A3/A5/A7 2016, A8, J5, C5, C7, and C9000 repair jobs. Each unit gets checked before it ships, so you're working with a component that's ready for your rework station, not something you'll need to test and reject before use. For shops handling regular Samsung charging faults, keeping this IC on your bench cuts your turnaround time on one of the most common repair tickets you'll see across this board family.