S527R Power IC

Open up a dead Samsung Galaxy A7 2018 and you're looking at one of the most common failure points on the board — the power rail feeding off the S527R. This chip sits between the battery input and the rest of the mainboard, distributing regulated voltage to the CPU, memory, display driver, and charging circuit. When it fails, you don't get a partial fault. You get a phone that shows zero current draw on your power supply, no charging LED, no vibration, no logo — a completely dead board.Technicians usually land on this IC after ruling out the battery, charging port, and PMU fuse. If your board draws short current or zero current at all on the bench supply, and your diode mode check on the power rails shows an open or shorted line near the S527R pad, the chip itself is the fault — not a software issue, not a battery issue. No amount of flashing or software marna fixes a dead power IC. This is strictly a hardware fault that needs IC change.This particular chip ships in BGA package, which means reflow or reballing with a hot air station is the standard install method. You're not soldering individual pins — you're reflowing the ball grid array onto the pads after cleaning the footprint with flux and isopropyl alcohol. A microscope helps confirm the ball alignment before you close the loop, especially on a board this dense. Get your preheat stage right, keep your hot air nozzle centered over the footprint, and avoid overheating neighboring components — the display connector and charging IC sit close by on this board layout.Supply voltage on this chip runs 1.0V to 6V, with a dissipation power rating of 0.6W. That range covers the regulated output the phone's charging circuit and CPU rail expect. Any deviation outside spec after installation usually points back to a cold joint or a misaligned ball, not a defective chip, so recheck your reflow before you write off the part.This IC is a direct fit for the Samsung Galaxy A7 2018 — not a universal or multi-device chip. If you're working on a different Samsung A-series board, don't assume this part crosses over; power ICs are model-specific even within the same series, and using the wrong one won't just fail to fix the fault, it can damage the board further.For your repair bench, this is the part you stock when dead phone jobs come in with a Galaxy A7 2018 badge on the back. Pair it with your existing reballing kit, PCB holder, and hot air station, and you've got a complete workflow for board-level power repair without waiting on a full motherboard swap. It saves the customer money over a board replacement and saves you time compared to chasing a fault that a straight IC change resolves in one sitting.
Keep it in your parts drawer alongside your other Samsung power and charging ICs — dead board jobs on this model come back often enough that having the part on hand beats ordering it mid-repair and leaving a customer's phone on your bench for days.